Bump Newtonsoft.Json in /src/Owin.Security.Providers.Untappd

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 8.0.3 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](https://github.com/JamesNK/Newtonsoft.Json/compare/8.0.3...13.0.1)

---
updated-dependencies:
- dependency-name: Newtonsoft.Json
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

.gitignore

@@ -70,6 +70,9 @@ ipch/
 # Guidance Automation Toolkit
 *.gpState
 
+# CodeRush is a .NET coding add-in
+.cr/
+
 # ReSharper is a .NET coding add-in
 _ReSharper*/
 *.[Rr]e[Ss]harper

Gemfile.lock

@@ -1,17 +1,17 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    albacore (2.0.4)
+    albacore (3.0.1)
       map (~> 6.5)
       nokogiri (~> 1.5)
-      rake (> 10)
+      rake (~> 10)
       semver2 (~> 3.4)
     map (6.6.0)
-    mini_portile2 (2.0.0)
-    nokogiri (1.6.7.2-x64-mingw32)
-      mini_portile2 (~> 2.0.0.rc2)
-    os (0.9.6)
-    rake (11.1.1)
+    mini_portile2 (2.3.0)
+    nokogiri (1.8.2-x64-mingw32)
+      mini_portile2 (~> 2.3.0)
+    os (1.0.0)
+    rake (10.5.0)
     semver2 (3.4.2)
 
 PLATFORMS
@@ -23,4 +23,4 @@ DEPENDENCIES
   os
 
 BUNDLED WITH
-   1.12.1
+   1.13.7

OwinOAuthProviders.sln

@@ -1,6 +1,6 @@
-Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 14
-VisualStudioVersion = 14.0.25123.0
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.26730.12
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Owin.Security.Providers.ArcGISOnline", "src\Owin.Security.Providers.ArcGISOnline\Owin.Security.Providers.ArcGISOnline.csproj", "{8A49FAEF-D365-4D25-942C-1CAD03845A5E}"
 EndProject
@@ -100,6 +100,22 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Owin.Security.Providers.Gen
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Owin.Security.Providers.MyHeritage", "src\Owin.Security.Providers.MyHeritage\Owin.Security.Providers.MyHeritage.csproj", "{84795078-31B5-4369-BD1B-F960165F8C71}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Owin.Security.Providers.Box", "src\Owin.Security.Providers.Box\Owin.Security.Providers.Box.csproj", "{1AEF8813-E1F9-41E1-BC8D-732960595E9F}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Owin.Security.Providers.Baidu", "src\Owin.Security.Providers.Baidu\Owin.Security.Providers.Baidu.csproj", "{E2759807-4D7C-4288-AAC8-F5B7B4616680}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Owin.Security.Providers.Evernote", "src\Owin.Security.Providers.Evernote\Owin.Security.Providers.Evernote.csproj", "{B8F05057-8B9F-44CE-B983-99CB7C2E9E5A}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Owin.Security.Providers.WSO2", "src\Owin.Security.Providers.WSO2\Owin.Security.Providers.WSO2.csproj", "{8FD3A9CB-E684-42C0-A8BF-7746FDD3D43C}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Owin.Security.Providers.Podbean", "src\Owin.Security.Providers.Podbean\Owin.Security.Providers.Podbean.csproj", "{A7B95FD4-08AD-499F-B574-07560CC2A63F}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Owin.Security.Providers.ArcGISPortal", "src\Owin.Security.Providers.ArcGISPortal\Owin.Security.Providers.ArcGISPortal.csproj", "{18547CA4-D7D3-43C2-81C2-A21FC8151A93}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Owin.Security.Providers.Typeform", "src\Owin.Security.Providers.Typeform\Owin.Security.Providers.Typeform.csproj", "{C8862B45-E1D1-4AB7-A83D-3A2FD2A22526}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Owin.Security.Providers.Google", "src\Owin.Security.Providers.Google\Owin.Security.Providers.Google.csproj", "{ED434959-8CF8-4CAB-83B3-E4A618327AB5}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -302,8 +318,43 @@ Global
 		{84795078-31B5-4369-BD1B-F960165F8C71}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{84795078-31B5-4369-BD1B-F960165F8C71}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{84795078-31B5-4369-BD1B-F960165F8C71}.Release|Any CPU.Build.0 = Release|Any CPU
+		{1AEF8813-E1F9-41E1-BC8D-732960595E9F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1AEF8813-E1F9-41E1-BC8D-732960595E9F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1AEF8813-E1F9-41E1-BC8D-732960595E9F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1AEF8813-E1F9-41E1-BC8D-732960595E9F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E2759807-4D7C-4288-AAC8-F5B7B4616680}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E2759807-4D7C-4288-AAC8-F5B7B4616680}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E2759807-4D7C-4288-AAC8-F5B7B4616680}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E2759807-4D7C-4288-AAC8-F5B7B4616680}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B8F05057-8B9F-44CE-B983-99CB7C2E9E5A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B8F05057-8B9F-44CE-B983-99CB7C2E9E5A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B8F05057-8B9F-44CE-B983-99CB7C2E9E5A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B8F05057-8B9F-44CE-B983-99CB7C2E9E5A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{8FD3A9CB-E684-42C0-A8BF-7746FDD3D43C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8FD3A9CB-E684-42C0-A8BF-7746FDD3D43C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8FD3A9CB-E684-42C0-A8BF-7746FDD3D43C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8FD3A9CB-E684-42C0-A8BF-7746FDD3D43C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A7B95FD4-08AD-499F-B574-07560CC2A63F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A7B95FD4-08AD-499F-B574-07560CC2A63F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A7B95FD4-08AD-499F-B574-07560CC2A63F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A7B95FD4-08AD-499F-B574-07560CC2A63F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{18547CA4-D7D3-43C2-81C2-A21FC8151A93}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{18547CA4-D7D3-43C2-81C2-A21FC8151A93}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{18547CA4-D7D3-43C2-81C2-A21FC8151A93}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{18547CA4-D7D3-43C2-81C2-A21FC8151A93}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C8862B45-E1D1-4AB7-A83D-3A2FD2A22526}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C8862B45-E1D1-4AB7-A83D-3A2FD2A22526}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C8862B45-E1D1-4AB7-A83D-3A2FD2A22526}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C8862B45-E1D1-4AB7-A83D-3A2FD2A22526}.Release|Any CPU.Build.0 = Release|Any CPU
+		{ED434959-8CF8-4CAB-83B3-E4A618327AB5}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{ED434959-8CF8-4CAB-83B3-E4A618327AB5}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{ED434959-8CF8-4CAB-83B3-E4A618327AB5}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{ED434959-8CF8-4CAB-83B3-E4A618327AB5}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {EDFDB942-6583-4AD9-A868-B354B5BF07FC}
+	EndGlobalSection
 EndGlobal

OwinOAuthProvidersDemo/App_Start/Startup.Auth.cs

@@ -2,9 +2,10 @@
 using Microsoft.Owin;
 using Microsoft.Owin.Security.Cookies;
 using Owin;
-
-//using Owin.Security.Providers.Orcid;
-//using Owin.Security.Providers.Discord;
+using Owin.Security.Providers.Evernote;
+using Owin.Security.Providers.PayPal;
+using Owin.Security.Providers.ArcGISPortal;
+using Owin.Security.Providers.Typeform;
 
 namespace OwinOAuthProvidersDemo
 {
@@ -126,14 +127,50 @@ namespace OwinOAuthProvidersDemo
             //    clientId: "",
             //    clientSecret: "");
 
-            //in scenarios where a sandbox URL needs to be used
-            //var salesforceOptions = new SalesforceAuthenticationOptions
+            // Salesforce Option 1: don't specify explicit Endpoint config and use Production endpoint defaults
+            //var salesforceOptions1 = new SalesforceAuthenticationOptions
+            //{
+            //    ClientId = "",
+            //    ClientSecret = "",
+            //    Provider = new SalesforceAuthenticationProvider()
+            //    {
+            //        OnAuthenticated = async context =>
+            //        {
+            //            System.Diagnostics.Debug.WriteLine(context.AccessToken);
+            //            System.Diagnostics.Debug.WriteLine(context.RefreshToken);
+            //            System.Diagnostics.Debug.WriteLine(context.OrganizationId);
+            //        }
+            //    }
+            //};
+
+            // Salesforce Option 2: ask for Sandbox environment; no need to know what those endpoints are
+            //var salesforceOptions2 = new SalesforceAuthenticationOptions
             //{
             //    Endpoints =
             //        new SalesforceAuthenticationOptions.SalesforceAuthenticationEndpoints
             //        {
-            //            AuthorizationEndpoint =
-            //                "https://ap1.salesforce.com/services/oauth2/authorize",
+            //            Environment = Owin.Security.Providers.Salesforce.Constants.SandboxEnvironment
+            //        },
+            //    ClientId = "",
+            //    ClientSecret = "",
+            //    Provider = new SalesforceAuthenticationProvider()
+            //    {
+            //        OnAuthenticated = async context =>
+            //        {
+            //            System.Diagnostics.Debug.WriteLine(context.AccessToken);
+            //            System.Diagnostics.Debug.WriteLine(context.RefreshToken);
+            //            System.Diagnostics.Debug.WriteLine(context.OrganizationId);
+            //        }
+            //    }
+            //};
+
+            // Salesforce Option 3: explicitly specify endpoints (will take precedence over Environment choice)
+            //var salesforceOptions3 = new SalesforceAuthenticationOptions
+            //{
+            //    Endpoints =
+            //        new SalesforceAuthenticationOptions.SalesforceAuthenticationEndpoints
+            //        {
+            //            AuthorizationEndpoint = "https://ap1.salesforce.com/services/oauth2/authorize",
             //            TokenEndpoint = "https://ap1.salesforce.com/services/oauth2/token"
             //        },
             //    ClientId = "",
@@ -148,7 +185,7 @@ namespace OwinOAuthProvidersDemo
             //        }
             //    }
             //};
-            //app.UseSalesforceAuthentication(salesforceOptions);
+            //app.UseSalesforceAuthentication(salesforceOptions1);
 
             ////app.UseShopifyAuthentication("", "");
 
@@ -156,6 +193,12 @@ namespace OwinOAuthProvidersDemo
             //    clientId: "",
             //    clientSecret: "");
 
+            //app.UseArcGISPortalAuthentication(new ArcGISPortalAuthenticationOptions(
+            //    "My ArcGIS Portal",
+            //    "https://arcgisportal.mydomain.com/",
+            //    "",
+            //    ""));
+
             //app.UseWordPressAuthentication(
             //    clientId: "",
             //    clientSecret: "");
@@ -168,6 +211,14 @@ namespace OwinOAuthProvidersDemo
             //    clientId: "",
             //    clientSecret: "");
 
+            //app.UseBoxAuthentication(
+            //    appKey: "",
+            //    appSecret: "");
+
+            //app.UseBaiduAuthentication(
+            //    apiKey: "",
+            //    secretKey: "");
+
             //app.UseBattleNetAuthentication(new BattleNetAuthenticationOptions
             //{
             //	ClientId = "",
@@ -187,10 +238,20 @@ namespace OwinOAuthProvidersDemo
             //	clientId: "",
             //	clientSecret: "");
 
-            //app.UsePayPalAuthentication(
-            //	clientId: "",
-            //	clientSecret: "",
-            //	isSandbox: false);
+            // PayPal no longer supports Tls 1.0 or 1.1
+            // https://devblog.paypal.com/upcoming-security-changes-notice/
+            // http://stackoverflow.com/questions/34939523/the-request-was-aborted-could-not-create-ssl-tls-secure-channel-sandbox-account
+            // System.Net.ServicePointManager.SecurityProtocol = System.Net.ServicePointManager.SecurityProtocol | System.Net.SecurityProtocolType.Tls12;
+            // The Return URL must be configured in the PayPal application to https://[hostname][:port]/signin-paypal
+            // PayPalAuthenticationOptions payPalOptions = new PayPalAuthenticationOptions(true);
+            // payPalOptions.ClientId = "";
+            // payPalOptions.ClientSecret = "";
+            // payPalOptions.Scope.Add("email");
+            // payPalOptions.Scope.Add("profile");
+            // payPalOptions.Scope.Add("address");
+            // payPalOptions.Scope.Add("https://uri.paypal.com/services/expresscheckout");
+
+            // app.UsePayPalAuthentication(payPalOptions);
 
             //app.UseWargamingAccountAuthentication("", WargamingAuthenticationOptions.Region.NorthAmerica);
 
@@ -281,6 +342,33 @@ namespace OwinOAuthProvidersDemo
             //app.UseDiscordAuthentication("", "");
             //app.UseGeniAuthentication("", "");
             //app.UseMyHeritageAuthentication("", "");
+
+            //app.UseWSO2Authentication("", "", "");
+
+            //app.UseEvernoteAuthentication(new EvernoteAuthenticationOptions()
+            //{
+            //      IsSandBox = true,
+            //      AppKey = "",
+            //      AppSecret = ""
+            //});
+
+            //app.UsePodbeanAuthentication(new PodbeanAuthenticationOptions
+            //{
+            //      AppId = "",
+            //      AppSecret = "",
+            //      DebugUsingRequestHeadersToBuildBaseUri = true
+            //});
+
+            // WARNING:
+            // Typeform doesn't supply the user's ID so use this provider for authorization only, not authentication 
+            // because each time you sign in with the same Typeform account it will yield a distinct UserId.
+            //var typeformOptions = new Owin.Security.Providers.Typeform.TypeformAuthenticationOptions
+            //{
+            //    ClientId = "",
+            //    ClientSecret = "",
+            //};
+            //typeformOptions.Scope.Add("forms:read");
+            //app.UseTypeformAuthentication(typeformOptions);
         }
     }
 }

OwinOAuthProvidersDemo/Controllers/AccountController.cs

@@ -419,6 +419,13 @@ namespace OwinOAuthProvidersDemo.Controllers
                     properties.Dictionary[ShopNameKey] = ShopName;
                 }
 
+                // if use Salesforce as OAuth provider you can ask for Sandbox auth endpoint 
+                // for this particular request only
+                //properties.Dictionary.Add(
+                //    Owin.Security.Providers.Salesforce.Constants.EnvironmentAuthenticationProperty,
+                //    Owin.Security.Providers.Salesforce.Constants.SandboxEnvironment
+                //    );
+
                 context.HttpContext.GetOwinContext().Authentication.Challenge(properties, LoginProvider);
             }
         }

OwinOAuthProvidersDemo/OwinOAuthProvidersDemo.csproj

@@ -22,6 +22,7 @@
     <IISExpressUseClassicPipelineMode>false</IISExpressUseClassicPipelineMode>
     <UseGlobalApplicationHostFile />
     <TargetFrameworkProfile />
+    <Use64BitIISExpress />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -31,6 +32,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -39,6 +41,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Antlr3.Runtime, Version=3.5.0.2, Culture=neutral, PublicKeyToken=eb42632606e9261f, processorArchitecture=MSIL">
@@ -251,6 +254,228 @@
   <ItemGroup>
     <Content Include="Scripts\jquery-2.2.3.min.map" />
   </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\base\Owin.Security.Providers.OpenIDBase\Owin.Security.Providers.OpenIDBase.csproj">
+      <Project>{4fd7b873-1994-4990-aa40-c37060121494}</Project>
+      <Name>Owin.Security.Providers.OpenIDBase</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.ArcGISOnline\Owin.Security.Providers.ArcGISOnline.csproj">
+      <Project>{8a49faef-d365-4d25-942c-1cad03845a5e}</Project>
+      <Name>Owin.Security.Providers.ArcGISOnline</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.ArcGISPortal\Owin.Security.Providers.ArcGISPortal.csproj">
+      <Project>{18547ca4-d7d3-43c2-81c2-a21fc8151a93}</Project>
+      <Name>Owin.Security.Providers.ArcGISPortal</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Asana\Owin.Security.Providers.Asana.csproj">
+      <Project>{f3e27220-1d8c-4037-94aa-7b7f4a12f351}</Project>
+      <Name>Owin.Security.Providers.Asana</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Backlog\Owin.Security.Providers.Backlog.csproj">
+      <Project>{2dc03778-9ef1-466a-83ec-7d8422decd23}</Project>
+      <Name>Owin.Security.Providers.Backlog</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Baidu\Owin.Security.Providers.Baidu.csproj">
+      <Project>{e2759807-4d7c-4288-aac8-f5b7b4616680}</Project>
+      <Name>Owin.Security.Providers.Baidu</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.BattleNet\Owin.Security.Providers.BattleNet.csproj">
+      <Project>{99a175da-ade4-436c-a272-c8ae44b7a086}</Project>
+      <Name>Owin.Security.Providers.BattleNet</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Bitbucket\Owin.Security.Providers.Bitbucket.csproj">
+      <Project>{e5212fc7-abcb-462f-9989-8e022dffe43c}</Project>
+      <Name>Owin.Security.Providers.Bitbucket</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Box\Owin.Security.Providers.Box.csproj">
+      <Project>{1aef8813-e1f9-41e1-bc8d-732960595e9f}</Project>
+      <Name>Owin.Security.Providers.Box</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Buffer\Owin.Security.Providers.Buffer.csproj">
+      <Project>{6f75fc1f-d9e9-49b3-a6ce-cfa8feea11a5}</Project>
+      <Name>Owin.Security.Providers.Buffer</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Cosign\Owin.Security.Providers.Cosign.csproj">
+      <Project>{1f1f8d6b-7219-46fa-93d3-8d3061a6cbbf}</Project>
+      <Name>Owin.Security.Providers.Cosign</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.DeviantArt\Owin.Security.Providers.DeviantArt.csproj">
+      <Project>{fabd2e54-976d-41f5-8800-dee58acc027c}</Project>
+      <Name>Owin.Security.Providers.DeviantArt</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Discord\Owin.Security.Providers.Discord.csproj">
+      <Project>{4be728eb-778a-41af-8dea-0c7159711d44}</Project>
+      <Name>Owin.Security.Providers.Discord</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.DoYouBuzz\Owin.Security.Providers.DoYouBuzz.csproj">
+      <Project>{4550d8bd-05a7-44f8-bbc0-c3d8e7af2912}</Project>
+      <Name>Owin.Security.Providers.DoYouBuzz</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Dropbox\Owin.Security.Providers.Dropbox.csproj">
+      <Project>{cef697b1-3651-49e5-9060-65f2e26c039c}</Project>
+      <Name>Owin.Security.Providers.Dropbox</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.EVEOnline\Owin.Security.Providers.EVEOnline.csproj">
+      <Project>{f5dc23f4-5042-4024-9e34-aca648602ba0}</Project>
+      <Name>Owin.Security.Providers.EVEOnline</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Evernote\Owin.Security.Providers.Evernote.csproj">
+      <Project>{b8f05057-8b9f-44ce-b983-99cb7c2e9e5a}</Project>
+      <Name>Owin.Security.Providers.Evernote</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Fitbit\Owin.Security.Providers.Fitbit.csproj">
+      <Project>{ca44d014-5a74-4749-a891-1f711fd3a266}</Project>
+      <Name>Owin.Security.Providers.Fitbit</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Flickr\Owin.Security.Providers.Flickr.csproj">
+      <Project>{af6cbeb8-5638-43d4-839e-c81f305960be}</Project>
+      <Name>Owin.Security.Providers.Flickr</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Foursquare\Owin.Security.Providers.Foursquare.csproj">
+      <Project>{8acd9194-1efe-4128-ac42-856d856332a4}</Project>
+      <Name>Owin.Security.Providers.Foursquare</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Geni\Owin.Security.Providers.Geni.csproj">
+      <Project>{9de25431-f935-48d7-8eb5-acb6f918111c}</Project>
+      <Name>Owin.Security.Providers.Geni</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.GitHub\Owin.Security.Providers.GitHub.csproj">
+      <Project>{803f9eb7-029c-45ac-ab81-135e60d5beae}</Project>
+      <Name>Owin.Security.Providers.GitHub</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Gitter\Owin.Security.Providers.Gitter.csproj">
+      <Project>{42ec50eb-0c51-460c-93a4-1e007bf1f323}</Project>
+      <Name>Owin.Security.Providers.Gitter</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.GooglePlus\Owin.Security.Providers.GooglePlus.csproj">
+      <Project>{d3fef959-0e0e-4f50-954c-f123a0b629dc}</Project>
+      <Name>Owin.Security.Providers.GooglePlus</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.HealthGraph\Owin.Security.Providers.HealthGraph.csproj">
+      <Project>{157bb715-29b2-4202-8a59-ccbacfcbedd3}</Project>
+      <Name>Owin.Security.Providers.HealthGraph</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Imgur\Owin.Security.Providers.Imgur.csproj">
+      <Project>{101841d3-645e-4a44-af8b-8aaa85ceea4e}</Project>
+      <Name>Owin.Security.Providers.Imgur</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Instagram\Owin.Security.Providers.Instagram.csproj">
+      <Project>{041178c4-6131-4d68-9896-ce33124d83a0}</Project>
+      <Name>Owin.Security.Providers.Instagram</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.LinkedIn\Owin.Security.Providers.LinkedIn.csproj">
+      <Project>{9fa87825-30e9-48d7-ac4a-39e8f0c2777c}</Project>
+      <Name>Owin.Security.Providers.LinkedIn</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.MyHeritage\Owin.Security.Providers.MyHeritage.csproj">
+      <Project>{84795078-31b5-4369-bd1b-f960165f8c71}</Project>
+      <Name>Owin.Security.Providers.MyHeritage</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Onshape\Owin.Security.Providers.Onshape.csproj">
+      <Project>{9fec99f8-6f45-40a2-8200-85381434c79a}</Project>
+      <Name>Owin.Security.Providers.Onshape</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.OpenID\Owin.Security.Providers.OpenID.csproj">
+      <Project>{90c152d7-9c66-4949-9998-c7ce48b593de}</Project>
+      <Name>Owin.Security.Providers.OpenID</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Orcid\Owin.Security.Providers.Orcid.csproj">
+      <Project>{89cb4342-e23d-4e7c-89e5-c369599a5860}</Project>
+      <Name>Owin.Security.Providers.Orcid</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.PayPal\Owin.Security.Providers.PayPal.csproj">
+      <Project>{f7129064-3db7-4b79-81d3-80130d664e45}</Project>
+      <Name>Owin.Security.Providers.PayPal</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Podbean\Owin.Security.Providers.Podbean.csproj">
+      <Project>{a7b95fd4-08ad-499f-b574-07560cc2a63f}</Project>
+      <Name>Owin.Security.Providers.Podbean</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Reddit\Owin.Security.Providers.Reddit.csproj">
+      <Project>{d0cd86c8-a6f9-4c6c-9bf0-eaa461e7fbad}</Project>
+      <Name>Owin.Security.Providers.Reddit</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Salesforce\Owin.Security.Providers.Salesforce.csproj">
+      <Project>{827a9d68-0dd4-4c5e-b763-8302faeedecc}</Project>
+      <Name>Owin.Security.Providers.Salesforce</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Shopify\Owin.Security.Providers.Shopify.csproj">
+      <Project>{67f12bfb-eb3a-4a86-b5dc-f4c066fdf792}</Project>
+      <Name>Owin.Security.Providers.Shopify</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.SlackProvider\Owin.Security.Providers.SlackProvider.csproj">
+      <Project>{3e6f293d-8500-428d-bdc9-27440cc91e16}</Project>
+      <Name>Owin.Security.Providers.SlackProvider</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.SoundCloud\Owin.Security.Providers.SoundCloud.csproj">
+      <Project>{2c959026-7058-4302-a6c4-dfd10a030585}</Project>
+      <Name>Owin.Security.Providers.SoundCloud</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Spotify\Owin.Security.Providers.Spotify.csproj">
+      <Project>{683b4041-a399-40ce-84b8-392f08a6805d}</Project>
+      <Name>Owin.Security.Providers.Spotify</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.StackExchange\Owin.Security.Providers.StackExchange.csproj">
+      <Project>{2c0e07ed-f26d-4ff8-8c3d-f760c09a2d5a}</Project>
+      <Name>Owin.Security.Providers.StackExchange</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Steam\Owin.Security.Providers.Steam.csproj">
+      <Project>{312c4ed7-8ca1-4723-9203-abc694dfdc7c}</Project>
+      <Name>Owin.Security.Providers.Steam</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.TripIt\Owin.Security.Providers.TripIt.csproj">
+      <Project>{b35e2616-dc00-48b4-bd58-7e23046257f1}</Project>
+      <Name>Owin.Security.Providers.TripIt</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Twitch\Owin.Security.Providers.Twitch.csproj">
+      <Project>{c3cf8734-6aac-4f59-9a3e-1cba8582cd48}</Project>
+      <Name>Owin.Security.Providers.Twitch</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Typeform\Owin.Security.Providers.Typeform.csproj">
+      <Project>{c8862b45-e1d1-4ab7-a83d-3a2fd2a22526}</Project>
+      <Name>Owin.Security.Providers.Typeform</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Untappd\Owin.Security.Providers.Untappd.csproj">
+      <Project>{3e89eca3-f4e7-4181-b26b-8250d5151044}</Project>
+      <Name>Owin.Security.Providers.Untappd</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Vimeo\Owin.Security.Providers.Vimeo.csproj">
+      <Project>{98ecc703-d651-4ead-a55d-aa3e903ae4d7}</Project>
+      <Name>Owin.Security.Providers.Vimeo</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.VisualStudio\Owin.Security.Providers.VisualStudio.csproj">
+      <Project>{3b19fa31-ddff-427f-9d73-f860de74bbc2}</Project>
+      <Name>Owin.Security.Providers.VisualStudio</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.VKontakte\Owin.Security.Providers.VKontakte.csproj">
+      <Project>{32d70e31-3799-482a-ac7a-081ff9206fc3}</Project>
+      <Name>Owin.Security.Providers.VKontakte</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Wargaming\Owin.Security.Providers.Wargaming.csproj">
+      <Project>{aa72bfce-8495-4a4d-988d-f8d490521776}</Project>
+      <Name>Owin.Security.Providers.Wargaming</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.WordPress\Owin.Security.Providers.WordPress.csproj">
+      <Project>{0ede8223-dd5f-4db8-a98a-64b1f4591f48}</Project>
+      <Name>Owin.Security.Providers.WordPress</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.WSO2\Owin.Security.Providers.WSO2.csproj">
+      <Project>{8fd3a9cb-e684-42c0-a8bf-7746fdd3d43c}</Project>
+      <Name>Owin.Security.Providers.WSO2</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Xing\Owin.Security.Providers.Xing.csproj">
+      <Project>{d497d8bd-6ef9-4c30-b195-b0dd153418d6}</Project>
+      <Name>Owin.Security.Providers.Xing</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Yahoo\Owin.Security.Providers.Yahoo.csproj">
+      <Project>{1765bedb-9e4b-468c-baf6-06784cdced67}</Project>
+      <Name>Owin.Security.Providers.Yahoo</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\src\Owin.Security.Providers.Yammer\Owin.Security.Providers.Yammer.csproj">
+      <Project>{8d029a93-e687-4ddf-82b0-700ebbf477f7}</Project>
+      <Name>Owin.Security.Providers.Yammer</Name>
+    </ProjectReference>
+  </ItemGroup>
   <PropertyGroup>
     <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">10.0</VisualStudioVersion>
     <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>

README.md

@@ -1,10 +1,11 @@
 [![Build status](https://ci.appveyor.com/api/projects/status/gjlkpp86t8dw164f?svg=true)](https://ci.appveyor.com/project/tparnell8/owinoauthproviders)
 
-#OWIN OAuth Providers
+# OWIN OAuth Providers
 
 Provides a set of extra authentication providers for OWIN ([Project Katana](http://katanaproject.codeplex.com/)).  This project includes providers for:
 - OAuth
   - ArcGISOnline
+  - ArcGISPortal
   - Asana
   - Backlog
   - Battle.net
@@ -29,6 +30,7 @@ Provides a set of extra authentication providers for OWIN ([Project Katana](http
   - Onshape
   - ORCID
   - PayPal
+  - Podbean
   - Reddit
   - Salesforce
   - Shopify
@@ -52,7 +54,9 @@ Provides a set of extra authentication providers for OWIN ([Project Katana](http
   - Wargaming
 
 ## Implementation Guides
-For above listed provider implementation guide, visit Jerrie Pelser's blog - [oauthforaspnet](http://www.oauthforaspnet.com)
+Take a look at the [samples project](https://github.com/TerribleDev/OwinOAuthProviders/blob/master/OwinOAuthProvidersDemo/App_Start/Startup.Auth.cs#L39). 
+
+
 
 ## Installation
 
@@ -84,7 +88,7 @@ A big thanks goes out to all these contributors without whom this would not have
 * Ben Foster (https://github.com/benfoster)
 * Jonathan Peterson (https://github.com/eonasdan)
 
-For most accurate and up to date list of contributors please see https://github.com/RockstarLabs/OwinOAuthProviders/graphs/contributors
+For most accurate and up to date list of contributors please see https://github.com/TerribleDev/OwinOAuthProviders/graphs/contributors
 
 ## License
 

Rakefile.rb

@@ -9,13 +9,13 @@ require 'nokogiri'
 require 'openssl'
 import 'nuget.rake'
 
-CLEAN.include(['src/**/obj', 'src/**/bin', 'tool', 'packages/**','src/**/*.nuspec', 'src/**/*.nupkg', 'tools', 'packages', '*.nupkg'])
+CLEAN.include(['src/**/obj', 'Owin.Security.Providers.nuspec', 'Owin.Security.Providers-signed.nuspec' 'src/**/bin', 'tool', 'packages/**','src/**/*.nuspec', 'src/**/*.nupkg', 'tools', 'packages', '*.nupkg'])
 Configuration = ENV['CONFIGURATION'] || 'Release'
 PACKAGES = File.expand_path("packages")
 TOOLS = File.expand_path("tools")
 NUGET = File.expand_path("#{TOOLS}/nuget")
 NUGET_EXE = File.expand_path("#{TOOLS}/nuget/nuget.exe")
-@version = ENV['APPVEYOR_REPO_TAG_NAME'] || '0.0.1-alpha1'
+@version = "2.26.0"
 PROJECTS = Dir.glob('src/*').select{|dir| File.directory? dir }
 
 desc 'Retrieve things'
@@ -31,12 +31,15 @@ task :preflight => [:clean, :build, :nuspec_gen]
 desc 'publish'
 task :publish => [:preflight,:nuspec_gen, :nuspec_pack,  :nuspec_publish]
 
+
+
 build :compile do |t|
   t.prop 'Configuration', Configuration
   t.sln = 'OwinOAuthProviders.sln'
+  t.prop 'SignAssembly', 'true'
+  t.prop 'AssemblyOriginatorKeyFile', File.expand_path("keypair.snk")
 end
 
-
 desc "Generate nuspec files"
 task :nuspec_gen do
   template = ERB.new(File.read('nuspectemplate.nuspec.erb'))
@@ -51,6 +54,7 @@ task :nuspec_gen do
   File.write('Owin.Security.Providers.nuspec', ERB.new(File.read('global.nuspec.erb')).result())
 end
 
+
 desc 'pack nuspec files'
 task :nuspec_pack do
   PROJECTS.each{|dir|
@@ -61,18 +65,13 @@ task :nuspec_pack do
   sh "#{NUGET_EXE} pack Owin.Security.Providers.nuspec -Exclude \"**\""
 end
 
+
 desc 'publish nugets'
 task :nuspec_publish do
- if ENV['APPVEYOR_REPO_TAG'] != 'true'
-  puts 'not publishing since APPVEYOR_REPO_TAG has not been set. Please add a github tag'
-  return nil
- end
-
-
   PROJECTS.each{|dir|
     Dir.chdir(dir) do
-      sh "#{NUGET_EXE} push #{FileList["*.nupkg"].first} -ApiKey #{NUGET_KEY}"
+      sh "#{NUGET_EXE} push -Source https://api.nuget.org/v3/index.json #{FileList["*.nupkg"].first}"
     end
   }
-  sh "#{NUGET_EXE} push #{FileList["*.nupkg"].first} -ApiKey #{NUGET_KEY}"
+  sh "#{NUGET_EXE} push -Source https://api.nuget.org/v3/index.json #{FileList["*.nupkg"].first}"
 end

appveyor.yml

@@ -5,9 +5,6 @@ install:
   - set PATH=C:\Ruby22\bin;%PATH%
   - bundle install
 build_script:
-  - rake publish
+  - rake preflight
 artifacts:
 - path: src\**\*.nupkg
-environment:
-  NUGET_KEY:
-    secure: 5m1zupizmNvVwCg2MDUkRGQbbVfNypLo9yCstTAXQ5KHDypBe5RrGKi1HnEAhAy8

base/Owin.Security.Providers.OpenIDBase/Owin.Security.Providers.OpenIDBase.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
@@ -89,6 +91,10 @@
   <ItemGroup>
     <None Include="packages.config" />
   </ItemGroup>
+  <PropertyGroup>
+    <SignAssembly>true</SignAssembly>
+    <AssemblyOriginatorKeyFile>..\..\keypair.snk</AssemblyOriginatorKeyFile>
+  </PropertyGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.

base/Owin.Security.Providers.OpenIDBase/Owin.Security.Providers.OpenIDBase.nuspec

@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>Owin.Security.Providers.OpenIDBase</id>
-    <version>2.1</version>
+    <version>2.1.1</version>
     <authors>Jerrie Pelser, Tommy Parnell and contributors</authors>
     <owners>Tommy Parnell</owners>
     <licenseUrl>http://opensource.org/licenses/MIT</licenseUrl>

global.nuspec.erb

@@ -16,9 +16,7 @@
       There are many individual providers, this package is a meta package that has a dependency on all of them.
     </summary>
     <releaseNotes>
-      Version 2.3
-      - Added Geni, and discord providers.
-      - Retarget to .net 4.5 from 4.5.2
+    View the release notes on github
     </releaseNotes>
     <copyright>Copyright 2013 - 2016</copyright>
     <tags>owin katana oauth LinkedIn Yahoo Google+ GitHub Reddit Instagram StackExchange SalesForce TripIt Buffer ArcGIS Dropbox Wordpress Battle.NET Yammer OpenID Steam Twitch</tags>

nuget.rake

@@ -10,12 +10,12 @@ namespace :nuget do
       begin
       FileUtils.mkdir_p("#{NUGET}")
       File.open("#{NUGET}/nuget.exe", "wb") do |file|
-        file.write open('http://nuget.org/nuget.exe', {ssl_verify_mode: OpenSSL::SSL::VERIFY_NONE}).read
+        file.write open('https://dist.nuget.org/win-x86-commandline/latest/nuget.exe', {ssl_verify_mode: OpenSSL::SSL::VERIFY_NONE}).read
       end
     rescue
       FileUtils.rm_rf("#{NUGET}/nuget.exe")
       File.open("#{NUGET}/nuget.exe", "wb") do |file|
-        file.write open('https://dist.nuget.org/win-x86-commandline/v3.2.0/nuget.exe', {ssl_verify_mode: OpenSSL::SSL::VERIFY_NONE}).read
+        file.write open('https://dist.nuget.org/win-x86-commandline/latest/nuget.exe', {ssl_verify_mode: OpenSSL::SSL::VERIFY_NONE}).read
       end
     end
     end

nuspectemplate.nuspec.erb

@@ -19,11 +19,9 @@
       Also adds generic OpenID 2.0 providers as well implementations for Steam and Wargaming.
     </summary>
     <releaseNotes>
-      Version 2.3
-      - Added Geni, and discord providers.
-      - Retarget to .net 4.5 from 4.5.2
+    View the release notes on github
     </releaseNotes>
     <copyright>Copyright 2013 - 2016</copyright>
-    <tags>owin katana oauth LinkedIn Yahoo Google+ GitHub Reddit Instagram StackExchange SalesForce TripIt Buffer ArcGIS Dropbox Wordpress Battle.NET Yammer OpenID Steam Twitch</tags>
+    <tags>owin katana oauth LinkedIn Yahoo Google+ GitHub Reddit Instagram StackExchange SalesForce TripIt Buffer ArcGIS Dropbox Wordpress Battle.NET Yammer OpenID Steam Twitch Box Baidu</tags>
   </metadata>
 </package>

src/Owin.Security.Providers.ArcGISOnline/Owin.Security.Providers.ArcGISOnline.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.ArcGISPortal/ArcGISPortalAuthenticationExtensions.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace Owin.Security.Providers.ArcGISPortal
+{
+    public static class ArcGISPortalAuthenticationExtensions
+    {
+        public static IAppBuilder UseArcGISPortalAuthentication(this IAppBuilder app,
+            ArcGISPortalAuthenticationOptions options)
+        {
+            if (app == null)
+                throw new ArgumentNullException(nameof(app));
+            if (options == null)
+                throw new ArgumentNullException(nameof(options));
+
+            app.Use(typeof(ArcGISPortalAuthenticationMiddleware), app, options);
+
+            return app;
+        }
+    }
+}

src/Owin.Security.Providers.ArcGISPortal/ArcGISPortalAuthenticationHandler.cs

@@ -0,0 +1,234 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Security.Claims;
+using System.Threading.Tasks;
+using Microsoft.Owin.Infrastructure;
+using Microsoft.Owin.Logging;
+using Microsoft.Owin.Security;
+using Microsoft.Owin.Security.Infrastructure;
+using Newtonsoft.Json;
+
+namespace Owin.Security.Providers.ArcGISPortal
+{
+    public class ArcGISPortalAuthenticationHandler : AuthenticationHandler<ArcGISPortalAuthenticationOptions>
+    {
+        private const string XmlSchemaString = "http://www.w3.org/2001/XMLSchema#string";
+
+        private readonly ILogger _logger;
+        private readonly HttpClient _httpClient;
+        private readonly string _host;
+
+        public ArcGISPortalAuthenticationHandler(HttpClient httpClient, ILogger logger, string host)
+        {
+            _httpClient = httpClient;
+            _logger = logger;
+            _host = host;
+        }
+
+        protected override async Task<AuthenticationTicket> AuthenticateCoreAsync()
+        {
+            AuthenticationProperties properties = null;
+
+            try
+            {
+                string code = null;
+                string state = null;
+
+                var query = Request.Query;
+                var values = query.GetValues("code");
+                if (values != null && values.Count == 1)
+                {
+                    code = values[0];
+                }
+                values = query.GetValues("state");
+                if (values != null && values.Count == 1)
+                {
+                    state = values[0];
+                }
+
+                properties = Options.StateDataFormat.Unprotect(state);
+                if (properties == null)
+                {
+                    return null;
+                }
+                // OAuth2 10.12 CSRF
+                if (!ValidateCorrelationId(properties, _logger))
+                {
+                    return new AuthenticationTicket(null, properties);
+                }
+
+                var requestPrefix = Request.Scheme + "://" + Request.Host;
+                var redirectUri = requestPrefix + Request.PathBase + Options.CallbackPath;
+
+                // Build up the body for the token request
+                var body = new List<KeyValuePair<string, string>>
+                {
+                    new KeyValuePair<string, string>("grant_type", "authorization_code"),
+                    new KeyValuePair<string, string>("code", code),
+                    new KeyValuePair<string, string>("redirect_uri", redirectUri),
+                    new KeyValuePair<string, string>("client_id", Options.ClientId),
+                    new KeyValuePair<string, string>("client_secret", Options.ClientSecret)
+                };
+
+                // Request the token
+                var requestMessage = new HttpRequestMessage(HttpMethod.Post, Options.Endpoints.TokenEndpoint);
+                requestMessage.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
+                requestMessage.Content = new FormUrlEncodedContent(body);
+                var tokenResponse = await _httpClient.SendAsync(requestMessage);
+                tokenResponse.EnsureSuccessStatusCode();
+                var text = await tokenResponse.Content.ReadAsStringAsync();
+
+                // Deserializes the token response
+                dynamic response = JsonConvert.DeserializeObject<dynamic>(text);
+                var accessToken = (string)response.access_token;
+                var refreshToken = (string)response.refresh_token;
+
+                // Get the ArcGISPortal user
+                var userRequest = new HttpRequestMessage(HttpMethod.Get, Options.Endpoints.UserInfoEndpoint + "?f=json&token=" + Uri.EscapeDataString(accessToken));
+                userRequest.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
+                var userResponse = await _httpClient.SendAsync(userRequest, Request.CallCancelled);
+                userResponse.EnsureSuccessStatusCode();
+                text = await userResponse.Content.ReadAsStringAsync();
+                var user = JsonConvert.DeserializeObject<Provider.ArcGISPortalUser>(text);
+
+                var context = new ArcGISPortalAuthenticatedContext(Context, user, accessToken, refreshToken, _host)
+                {
+                    Identity = new ClaimsIdentity(
+                        Options.AuthenticationType,
+                        ClaimsIdentity.DefaultNameClaimType,
+                        ClaimsIdentity.DefaultRoleClaimType)
+                };
+                if (!string.IsNullOrEmpty(context.Id))
+                {
+                    context.Identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, context.Id, XmlSchemaString, Options.AuthenticationType));
+                }
+                if (!string.IsNullOrEmpty(context.UserName))
+                {
+                    context.Identity.AddClaim(new Claim(ClaimsIdentity.DefaultNameClaimType, context.UserName, XmlSchemaString, Options.AuthenticationType));
+                }
+                if (!string.IsNullOrEmpty(context.Email))
+                {
+                    context.Identity.AddClaim(new Claim(ClaimTypes.Email, context.Email, XmlSchemaString, Options.AuthenticationType));
+                }
+                if (!string.IsNullOrEmpty(context.Name))
+                {
+                    context.Identity.AddClaim(new Claim("urn:ArcGISPortal:name", context.Name, XmlSchemaString, Options.AuthenticationType));
+                }
+                if (!string.IsNullOrEmpty(context.Link))
+                {
+                    context.Identity.AddClaim(new Claim("urn:ArcGISPortal:url", context.Link, XmlSchemaString, Options.AuthenticationType));
+                }
+
+                context.Properties = properties;
+
+                await Options.Provider.Authenticated(context);
+
+                return new AuthenticationTicket(context.Identity, context.Properties);
+            }
+            catch (Exception ex)
+            {
+                _logger.WriteError(ex.Message);
+            }
+            return new AuthenticationTicket(null, properties);
+        }
+
+        protected override Task ApplyResponseChallengeAsync()
+        {
+            if (Response.StatusCode != 401)
+            {
+                return Task.FromResult<object>(null);
+            }
+
+            var challenge = Helper.LookupChallenge(Options.AuthenticationType, Options.AuthenticationMode);
+
+            if (challenge == null) return Task.FromResult<object>(null);
+            var baseUri =
+                Request.Scheme +
+                Uri.SchemeDelimiter +
+                Request.Host +
+                Request.PathBase;
+
+            var currentUri =
+                baseUri +
+                Request.Path +
+                Request.QueryString;
+
+            var redirectUri =
+                baseUri +
+                Options.CallbackPath;
+            var properties = challenge.Properties;
+            if (string.IsNullOrEmpty(properties.RedirectUri))
+            {
+                properties.RedirectUri = currentUri;
+            }
+
+            GenerateCorrelationId(properties);
+            var state = Options.StateDataFormat.Protect(properties);
+            // comma separated
+            var scope = string.Join(",", Options.Scope);
+
+            var authorizationEndpoint =
+                Options.Endpoints.AuthorizationEndpoint +
+                "?client_id=" + Uri.EscapeDataString(Options.ClientId) +
+                "&response_type=" + Uri.EscapeDataString(scope) +
+                "&redirect_uri=" + Uri.EscapeDataString(redirectUri) +
+                "&state=" + Uri.EscapeDataString(state);
+
+            Response.Redirect(authorizationEndpoint);
+
+            return Task.FromResult<object>(null);
+        }
+
+        public override async Task<bool> InvokeAsync()
+        {
+            return await InvokeReplyPathAsync();
+        }
+
+        private async Task<bool> InvokeReplyPathAsync()
+        {
+            if (!Options.CallbackPath.HasValue || Options.CallbackPath != Request.Path) return false;
+            // TODO: error responses
+
+            var ticket = await AuthenticateAsync();
+            if (ticket == null)
+            {
+                _logger.WriteWarning("Invalid return state, unable to redirect.");
+                Response.StatusCode = 500;
+                return true;
+            }
+
+            var context = new ArcGISPortalReturnEndpointContext(Context, ticket)
+            {
+                SignInAsAuthenticationType = Options.SignInAsAuthenticationType,
+                RedirectUri = ticket.Properties.RedirectUri
+            };
+
+            await Options.Provider.ReturnEndpoint(context);
+
+            if (context.SignInAsAuthenticationType != null &&
+                context.Identity != null)
+            {
+                var grantIdentity = context.Identity;
+                if (!string.Equals(grantIdentity.AuthenticationType, context.SignInAsAuthenticationType, StringComparison.Ordinal))
+                {
+                    grantIdentity = new ClaimsIdentity(grantIdentity.Claims, context.SignInAsAuthenticationType, grantIdentity.NameClaimType, grantIdentity.RoleClaimType);
+                }
+                Context.Authentication.SignIn(context.Properties, grantIdentity);
+            }
+
+            if (context.IsRequestCompleted || context.RedirectUri == null) return context.IsRequestCompleted;
+            var redirectUri = context.RedirectUri;
+            if (context.Identity == null)
+            {
+                // add a redirect hint that sign-in failed in some way
+                redirectUri = WebUtilities.AddQueryString(redirectUri, "error", "access_denied");
+            }
+            Response.Redirect(redirectUri);
+            context.RequestCompleted();
+
+            return context.IsRequestCompleted;
+        }
+    }
+}

src/Owin.Security.Providers.ArcGISPortal/ArcGISPortalAuthenticationMiddleware.cs

@@ -0,0 +1,87 @@
+using System;
+using System.Globalization;
+using System.Net.Http;
+using Microsoft.Owin;
+using Microsoft.Owin.Logging;
+using Microsoft.Owin.Security;
+using Microsoft.Owin.Security.DataHandler;
+using Microsoft.Owin.Security.DataProtection;
+using Microsoft.Owin.Security.Infrastructure;
+
+namespace Owin.Security.Providers.ArcGISPortal
+{
+    public class ArcGISPortalAuthenticationMiddleware : AuthenticationMiddleware<ArcGISPortalAuthenticationOptions>
+    {
+        private readonly HttpClient _httpClient;
+        private readonly ILogger _logger;
+
+        public ArcGISPortalAuthenticationMiddleware(OwinMiddleware next, IAppBuilder app,
+            ArcGISPortalAuthenticationOptions options)
+            : base(next, options)
+        {
+            if (string.IsNullOrWhiteSpace(Options.Host))
+                throw new ArgumentException(string.Format(CultureInfo.CurrentCulture,
+                    Resources.Exception_OptionMustBeProvided, "Host"));
+            if (string.IsNullOrWhiteSpace(Options.ClientId))
+                throw new ArgumentException(string.Format(CultureInfo.CurrentCulture,
+                    Resources.Exception_OptionMustBeProvided, "ClientId"));
+            if (string.IsNullOrWhiteSpace(Options.ClientSecret))
+                throw new ArgumentException(string.Format(CultureInfo.CurrentCulture,
+                    Resources.Exception_OptionMustBeProvided, "ClientSecret"));
+
+            _logger = app.CreateLogger<ArcGISPortalAuthenticationMiddleware>();
+
+            if (Options.Provider == null)
+                Options.Provider = new ArcGISPortalAuthenticationProvider();
+
+            if (Options.StateDataFormat == null)
+            {
+                var dataProtector = app.CreateDataProtector(
+                    typeof(ArcGISPortalAuthenticationMiddleware).FullName,
+                    Options.AuthenticationType, "v2");
+                Options.StateDataFormat = new PropertiesDataFormat(dataProtector);
+            }
+
+            if (string.IsNullOrEmpty(Options.SignInAsAuthenticationType))
+                Options.SignInAsAuthenticationType = app.GetDefaultSignInAsAuthenticationType();
+
+            _httpClient = new HttpClient(ResolveHttpMessageHandler(Options))
+            {
+                Timeout = Options.BackchannelTimeout,
+                MaxResponseContentBufferSize = 1024 * 1024 * 10,
+            };
+            _httpClient.DefaultRequestHeaders.UserAgent.ParseAdd("Microsoft Owin ArcGISPortal middleware");
+            _httpClient.DefaultRequestHeaders.ExpectContinue = false;
+        }
+
+        /// <summary>
+        ///     Provides the <see cref="T:Microsoft.Owin.Security.Infrastructure.AuthenticationHandler" /> object for processing
+        ///     authentication-related requests.
+        /// </summary>
+        /// <returns>
+        ///     An <see cref="T:Microsoft.Owin.Security.Infrastructure.AuthenticationHandler" /> configured with the
+        ///     <see cref="T:Owin.Security.Providers.ArcGISPortal.ArcGISPortalAuthenticationOptions" /> supplied to the constructor.
+        /// </returns>
+        protected override AuthenticationHandler<ArcGISPortalAuthenticationOptions> CreateHandler()
+        {
+            return new ArcGISPortalAuthenticationHandler(_httpClient, _logger, Options.Host);
+        }
+
+        private static HttpMessageHandler ResolveHttpMessageHandler(ArcGISPortalAuthenticationOptions options)
+        {
+            var handler = options.BackchannelHttpHandler ?? new WebRequestHandler();
+
+            // If they provided a validator, apply it or fail.
+            if (options.BackchannelCertificateValidator == null) return handler;
+            // Set the cert validate callback
+            var webRequestHandler = handler as WebRequestHandler;
+            if (webRequestHandler == null)
+            {
+                throw new InvalidOperationException(Resources.Exception_ValidatorHandlerMismatch);
+            }
+            webRequestHandler.ServerCertificateValidationCallback = options.BackchannelCertificateValidator.Validate;
+
+            return handler;
+        }
+    }
+}

src/Owin.Security.Providers.ArcGISPortal/ArcGISPortalAuthenticationOptions.cs

@@ -0,0 +1,171 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using Microsoft.Owin;
+using Microsoft.Owin.Security;
+
+namespace Owin.Security.Providers.ArcGISPortal
+{
+    public class ArcGISPortalAuthenticationOptions : AuthenticationOptions
+    {
+        public class ArcGISPortalAuthenticationEndpoints
+        {
+            /// <summary>
+            /// Endpoint which is used to redirect users to request ArcGISPortal access
+            /// </summary>
+            /// <remarks>
+            /// Defaults to https://www.arcgis.com/sharing/rest/oauth2/authorize/
+            /// </remarks>
+            public string AuthorizationEndpoint { get; set; }
+
+            /// <summary>
+            /// Endpoint which is used to exchange code for access token
+            /// </summary>
+            /// <remarks>
+            /// Defaults to https://www.arcgis.com/sharing/rest/oauth2/token/
+            /// </remarks>
+            public string TokenEndpoint { get; set; }
+
+            /// <summary>
+            /// Endpoint which is used to obtain user information after authentication
+            /// </summary>
+            /// <remarks>
+            /// Defaults to https://www.arcgis.com/sharing/rest/community/self
+            /// </remarks>
+            public string UserInfoEndpoint { get; set; }
+        }
+
+        private const string AuthenticationTypeNameDefault = "ArcGIS Portal";
+
+        private const string AuthorizationEndPoint = "arcgis/sharing/rest/oauth2/authorize/";
+        private const string TokenEndpoint = "arcgis/sharing/rest/oauth2/token/";
+        private const string UserInfoEndpoint = "arcgis/sharing/rest/community/self";
+
+        /// <summary>
+        ///     Gets or sets the a pinned certificate validator to use to validate the endpoints used
+        ///     in back channel communications belong to ArcGISPortal.
+        /// </summary>
+        /// <value>
+        ///     The pinned certificate validator.
+        /// </value>
+        /// <remarks>
+        ///     If this property is null then the default certificate checks are performed,
+        ///     validating the subject name and if the signing chain is a trusted party.
+        /// </remarks>
+        public ICertificateValidator BackchannelCertificateValidator { get; set; }
+
+        /// <summary>
+        ///     The HttpMessageHandler used to communicate with ArcGISPortal.
+        ///     This cannot be set at the same time as BackchannelCertificateValidator unless the value
+        ///     can be downcast to a WebRequestHandler.
+        /// </summary>
+        public HttpMessageHandler BackchannelHttpHandler { get; set; }
+
+        /// <summary>
+        ///     Gets or sets timeout value in milliseconds for back channel communications with ArcGISPortal.
+        /// </summary>
+        /// <value>
+        ///     The back channel timeout in milliseconds.
+        /// </value>
+        public TimeSpan BackchannelTimeout { get; set; }
+
+        /// <summary>
+        ///     The request path within the application's base path where the user-agent will be returned.
+        ///     The middleware will process this request when it arrives.
+        ///     Default value is "/signin-ArcGISPortal".
+        /// </summary>
+        public PathString CallbackPath { get; set; }
+
+        /// <summary>
+        ///     Get or sets the text that the user can display on a sign in user interface.
+        /// </summary>
+        public string Caption
+        {
+            get { return Description.Caption; }
+            set { Description.Caption = value; }
+        }
+
+        /// <summary>
+        ///     Gets or sets the ArcGIS Portal Authentication Type Name
+        ///     Displayed to the user as the login option, and allows multiple ArcGIS Portal OAuth providers to be configured for use in the same application.
+        /// </summary>
+        public string AuthenticationTypeName { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the ArcGIS Portal Host (where the portal is installed e.g. https://arcgisportal.domain.com)
+        /// </summary>
+        public string Host { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the ArcGISPortal supplied Client ID
+        /// </summary>
+        public string ClientId { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the ArcGISPortal supplied Client Secret
+        /// </summary>
+        public string ClientSecret { get; set; }
+
+        /// <summary>
+        /// Gets the sets of OAuth endpoints used to authenticate against ArcGISPortal.  Overriding these endpoints allows you to use ArcGISPortal Enterprise for
+        /// authentication.
+        /// </summary>
+        public ArcGISPortalAuthenticationEndpoints Endpoints { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the <see cref="IArcGISPortalAuthenticationProvider" /> used in the authentication events
+        /// </summary>
+        public IArcGISPortalAuthenticationProvider Provider { get; set; }
+
+        /// <summary>
+        /// A list of permissions to request.
+        /// </summary>
+        public IList<string> Scope { get; protected set; }
+
+        /// <summary>
+        ///     Gets or sets the name of another authentication middleware which will be responsible for actually issuing a user
+        ///     <see cref="System.Security.Claims.ClaimsIdentity" />.
+        /// </summary>
+        public string SignInAsAuthenticationType { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the type used to secure data handled by the middleware.
+        /// </summary>
+        public ISecureDataFormat<AuthenticationProperties> StateDataFormat { get; set; }
+
+        /// <summary>
+        ///     Initializes a new <see cref="ArcGISPortalAuthenticationOptions" />
+        /// </summary>
+        public ArcGISPortalAuthenticationOptions(string host, string clientId, string clientSecret) : this(AuthenticationTypeNameDefault, host, clientId, clientSecret) {}
+
+        /// <summary>
+        ///     Initializes a new <see cref="ArcGISPortalAuthenticationOptions" />
+        /// </summary>
+        public ArcGISPortalAuthenticationOptions(string authenticationTypeName, string host, string clientId, string clientSecret) : base(authenticationTypeName)
+        {
+            AuthenticationTypeName = authenticationTypeName;
+            Host = host;
+            ClientId = clientId;
+            ClientSecret = clientSecret;
+
+            AuthenticationType = AuthenticationTypeName;
+            Caption = AuthenticationTypeName;
+
+            CallbackPath = new PathString("/signin-arcgis-portal");
+            AuthenticationMode = AuthenticationMode.Passive;
+            Scope = new List<string>
+            {
+                "code"
+            };
+            BackchannelTimeout = TimeSpan.FromSeconds(60);
+
+            Uri hostUri = new Uri(Host);
+            Endpoints = new ArcGISPortalAuthenticationEndpoints
+            {
+                AuthorizationEndpoint = new Uri(hostUri, AuthorizationEndPoint).ToString(),
+                TokenEndpoint = new Uri(hostUri, TokenEndpoint).ToString(),
+                UserInfoEndpoint = new Uri(hostUri, UserInfoEndpoint).ToString()
+            };
+        }
+    }
+}

src/Owin.Security.Providers.ArcGISPortal/Owin.Security.Providers.ArcGISPortal.csproj

@@ -0,0 +1,82 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{18547CA4-D7D3-43C2-81C2-A21FC8151A93}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Owin.Security.Providers.ArcGISPortal</RootNamespace>
+    <AssemblyName>Owin.Security.Providers.ArcGISPortal</AssemblyName>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Microsoft.Owin.3.0.1\lib\net45\Microsoft.Owin.dll</HintPath>
+    </Reference>
+    <Reference Include="Microsoft.Owin.Security, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Microsoft.Owin.Security.3.0.1\lib\net45\Microsoft.Owin.Security.dll</HintPath>
+    </Reference>
+    <Reference Include="Newtonsoft.Json, Version=8.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Newtonsoft.Json.8.0.3\lib\net45\Newtonsoft.Json.dll</HintPath>
+    </Reference>
+    <Reference Include="Owin, Version=1.0.0.0, Culture=neutral, PublicKeyToken=f0ebd12fd5e55cc5, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Owin.1.0\lib\net40\Owin.dll</HintPath>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Net.Http.WebRequest" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="ArcGISPortalAuthenticationHandler.cs" />
+    <Compile Include="ArcGISPortalAuthenticationExtensions.cs" />
+    <Compile Include="ArcGISPortalAuthenticationMiddleware.cs" />
+    <Compile Include="ArcGISPortalAuthenticationOptions.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Provider\ArcGISPortalAuthenticationProvider.cs" />
+    <Compile Include="Provider\ArcGISPortalAuthenticatedContext.cs" />
+    <Compile Include="Provider\ArcGISPortalReturnEndpointContext.cs" />
+    <Compile Include="Provider\ArcGISPortalUser.cs" />
+    <Compile Include="Provider\IArcGISPortalAuthenticationProvider.cs" />
+    <Compile Include="Resources.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+    </EmbeddedResource>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

src/Owin.Security.Providers.ArcGISPortal/Properties/AssemblyInfo.cs

@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Owin.Security.Providers.ArcGISPortal")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Owin.Security.Providers.ArcGISPortal")]
+[assembly: AssemblyCopyright("Copyright ©  2017")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("18547ca4-d7d3-43c2-81c2-a21fc8151a93")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

src/Owin.Security.Providers.ArcGISPortal/Provider/ArcGISPortalAuthenticatedContext.cs

@@ -0,0 +1,81 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+using System.Security.Claims;
+using Microsoft.Owin;
+using Microsoft.Owin.Security;
+using Microsoft.Owin.Security.Provider;
+using Owin.Security.Providers.ArcGISPortal.Provider;
+using System;
+
+namespace Owin.Security.Providers.ArcGISPortal
+{
+    /// <summary>
+    /// Contains information about the login session as well as the user <see cref="System.Security.Claims.ClaimsIdentity"/>.
+    /// </summary>
+    public class ArcGISPortalAuthenticatedContext : BaseContext
+    {
+        /// <summary>
+        /// Initializes a <see cref="ArcGISPortalAuthenticatedContext"/>
+        /// </summary>
+        /// <param name="context">The OWIN environment</param>
+        /// <param name="user">The ArcGIS Portal user</param>
+        /// <param name="accessToken">ArcGIS Portal Access token</param>
+        /// <param name="refreshToken">ArcGIS Portal Refresh token</param>
+        /// <param name="host">ArcGIS Portal Host</param>
+        public ArcGISPortalAuthenticatedContext(IOwinContext context, ArcGISPortalUser user, string accessToken, string refreshToken, string host)
+            : base(context)
+        {
+            Uri hostUri = new Uri(host);
+
+            AccessToken = accessToken;
+            RefreshToken = refreshToken;
+            Id = user.Username;
+            Name = user.FullName;
+            Link = new Uri(hostUri, "arcgis/sharing/rest/community/users/" + Id).ToString();
+            UserName = Id;
+            Email = user.Email;
+        }
+
+        /// <summary>
+        /// Gets the ArcGIS Portal access token
+        /// </summary>
+        public string AccessToken { get; private set; }
+
+        /// <summary>
+        /// Gets the ArcGIS Portal refresh token
+        /// </summary>
+        public string RefreshToken { get; private set; }
+
+        /// <summary>
+        /// Gets the ArcGIS Portal user ID
+        /// </summary>
+        public string Id { get; }
+
+        /// <summary>
+        /// Gets the user's name
+        /// </summary>
+        public string Name { get; private set; }
+
+        /// <summary>
+        /// Gets the user's email
+        /// </summary>
+        public string Email { get; private set; }
+
+        public string Link { get; private set; }
+
+        /// <summary>
+        /// Gets the ArcGIS Portal username
+        /// </summary>
+        public string UserName { get; private set; }
+
+        /// <summary>
+        /// Gets the <see cref="ClaimsIdentity"/> representing the user
+        /// </summary>
+        public ClaimsIdentity Identity { get; set; }
+
+        /// <summary>
+        /// Gets or sets a property bag for common authentication properties
+        /// </summary>
+        public AuthenticationProperties Properties { get; set; }
+    }
+}

src/Owin.Security.Providers.ArcGISPortal/Provider/ArcGISPortalAuthenticationProvider.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Threading.Tasks;
+
+namespace Owin.Security.Providers.ArcGISPortal
+{
+    /// <summary>
+    /// Default <see cref="IArcGISPortalAuthenticationProvider"/> implementation.
+    /// </summary>
+    public class ArcGISPortalAuthenticationProvider : IArcGISPortalAuthenticationProvider
+    {
+        /// <summary>
+        /// Initializes a <see cref="ArcGISPortalAuthenticationProvider"/>
+        /// </summary>
+        public ArcGISPortalAuthenticationProvider()
+        {
+            OnAuthenticated = context => Task.FromResult<object>(null);
+            OnReturnEndpoint = context => Task.FromResult<object>(null);
+        }
+
+        /// <summary>
+        /// Gets or sets the function that is invoked when the Authenticated method is invoked.
+        /// </summary>
+        public Func<ArcGISPortalAuthenticatedContext, Task> OnAuthenticated { get; set; }
+
+        /// <summary>
+        /// Gets or sets the function that is invoked when the ReturnEndpoint method is invoked.
+        /// </summary>
+        public Func<ArcGISPortalReturnEndpointContext, Task> OnReturnEndpoint { get; set; }
+
+        /// <summary>
+        /// Invoked whenever ArcGISPortal successfully authenticates a user
+        /// </summary>
+        /// <param name="context">Contains information about the login session as well as the user <see cref="System.Security.Claims.ClaimsIdentity"/>.</param>
+        /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
+        public virtual Task Authenticated(ArcGISPortalAuthenticatedContext context)
+        {
+            return OnAuthenticated(context);
+        }
+
+        /// <summary>
+        /// Invoked prior to the <see cref="System.Security.Claims.ClaimsIdentity"/> being saved in a local cookie and the browser being redirected to the originally requested URL.
+        /// </summary>
+        /// <param name="context"></param>
+        /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
+        public virtual Task ReturnEndpoint(ArcGISPortalReturnEndpointContext context)
+        {
+            return OnReturnEndpoint(context);
+        }
+    }
+}

src/Owin.Security.Providers.ArcGISPortal/Provider/ArcGISPortalReturnEndpointContext.cs

@@ -0,0 +1,26 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+using Microsoft.Owin;
+using Microsoft.Owin.Security;
+using Microsoft.Owin.Security.Provider;
+
+namespace Owin.Security.Providers.ArcGISPortal
+{
+    /// <summary>
+    /// Provides context information to middleware providers.
+    /// </summary>
+    public class ArcGISPortalReturnEndpointContext : ReturnEndpointContext
+    {
+        /// <summary>
+        ///
+        /// </summary>
+        /// <param name="context">OWIN environment</param>
+        /// <param name="ticket">The authentication ticket</param>
+        public ArcGISPortalReturnEndpointContext(
+            IOwinContext context,
+            AuthenticationTicket ticket)
+            : base(context, ticket)
+        {
+        }
+    }
+}

src/Owin.Security.Providers.ArcGISPortal/Provider/ArcGISPortalUser.cs

@@ -0,0 +1,9 @@
+namespace Owin.Security.Providers.ArcGISPortal.Provider
+{
+    public class ArcGISPortalUser
+    {
+        public string Username { get; set; }
+        public string FullName { get; set; }
+        public string Email { get; set; }
+    }
+}

src/Owin.Security.Providers.ArcGISPortal/Provider/IArcGISPortalAuthenticationProvider.cs

@@ -0,0 +1,24 @@
+using System.Threading.Tasks;
+
+namespace Owin.Security.Providers.ArcGISPortal
+{
+    /// <summary>
+    /// Specifies callback methods which the <see cref="ArcGISPortalAuthenticationMiddleware"></see> invokes to enable developer control over the authentication process. />
+    /// </summary>
+    public interface IArcGISPortalAuthenticationProvider
+    {
+        /// <summary>
+        /// Invoked whenever ArcGISPortal successfully authenticates a user
+        /// </summary>
+        /// <param name="context">Contains information about the login session as well as the user <see cref="System.Security.Claims.ClaimsIdentity"/>.</param>
+        /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
+        Task Authenticated(ArcGISPortalAuthenticatedContext context);
+
+        /// <summary>
+        /// Invoked prior to the <see cref="System.Security.Claims.ClaimsIdentity"/> being saved in a local cookie and the browser being redirected to the originally requested URL.
+        /// </summary>
+        /// <param name="context"></param>
+        /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
+        Task ReturnEndpoint(ArcGISPortalReturnEndpointContext context);
+    }
+}

src/Owin.Security.Providers.ArcGISPortal/Resources.Designer.cs

@@ -0,0 +1,81 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace Owin.Security.Providers.ArcGISPortal {
+    using System;
+    
+    
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "15.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Resources {
+        
+        private static global::System.Resources.ResourceManager resourceMan;
+        
+        private static global::System.Globalization.CultureInfo resourceCulture;
+        
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Resources() {
+        }
+        
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager {
+            get {
+                if (object.ReferenceEquals(resourceMan, null)) {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("Owin.Security.Providers.ArcGISPortal.Resources", typeof(Resources).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to The &apos;{0}&apos; option must be provided..
+        /// </summary>
+        internal static string Exception_OptionMustBeProvided {
+            get {
+                return ResourceManager.GetString("Exception_OptionMustBeProvided", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to An ICertificateValidator cannot be specified at the same time as an HttpMessageHandler unless it is a WebRequestHandler..
+        /// </summary>
+        internal static string Exception_ValidatorHandlerMismatch {
+            get {
+                return ResourceManager.GetString("Exception_ValidatorHandlerMismatch", resourceCulture);
+            }
+        }
+    }
+}

src/Owin.Security.Providers.ArcGISPortal/Resources.resx

@@ -0,0 +1,126 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="Exception_OptionMustBeProvided" xml:space="preserve">
+    <value>The '{0}' option must be provided.</value>
+  </data>
+  <data name="Exception_ValidatorHandlerMismatch" xml:space="preserve">
+    <value>An ICertificateValidator cannot be specified at the same time as an HttpMessageHandler unless it is a WebRequestHandler.</value>
+  </data>
+</root>

src/Owin.Security.Providers.ArcGISPortal/packages.config

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Microsoft.Owin" version="3.0.1" targetFramework="net45" />
+  <package id="Microsoft.Owin.Security" version="3.0.1" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="8.0.3" targetFramework="net45" />
+  <package id="Owin" version="1.0" targetFramework="net45" />
+</packages>

src/Owin.Security.Providers.Asana/Owin.Security.Providers.Asana.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.Backlog/Owin.Security.Providers.Backlog.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.Baidu/BaiduAuthenticationExtensions.cs

@@ -0,0 +1,29 @@
+using System;
+
+namespace Owin.Security.Providers.Baidu
+{
+    public static class BaiduAuthenticationExtensions
+    {
+        public static IAppBuilder UseBaiduAuthentication(this IAppBuilder app,
+            BaiduAuthenticationOptions options)
+        {
+            if (app == null)
+                throw new ArgumentNullException(nameof(app));
+            if (options == null)
+                throw new ArgumentNullException(nameof(options));
+
+            app.Use(typeof(BaiduAuthenticationMiddleware), app, options);
+
+            return app;
+        }
+
+        public static IAppBuilder UseBaiduAuthentication(this IAppBuilder app, string apiKey, string secretKey)
+        {
+            return app.UseBaiduAuthentication(new BaiduAuthenticationOptions
+            {
+                ApiKey = apiKey,
+                SecretKey = secretKey
+            });
+        }
+    }
+}

src/Owin.Security.Providers.Baidu/BaiduAuthenticationHandler.cs

@@ -0,0 +1,236 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Security.Claims;
+using System.Threading.Tasks;
+using Microsoft.Owin;
+using Microsoft.Owin.Infrastructure;
+using Microsoft.Owin.Logging;
+using Microsoft.Owin.Security;
+using Microsoft.Owin.Security.Infrastructure;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using System.Net.Http.Headers;
+
+namespace Owin.Security.Providers.Baidu
+{
+    public class BaiduAuthenticationHandler : AuthenticationHandler<BaiduAuthenticationOptions>
+    {
+        private const string StateCookie = "_BaiduState";
+        private const string XmlSchemaString = "http://www.w3.org/2001/XMLSchema#string";
+        private const string TokenEndpoint = "https://openapi.baidu.com/oauth/2.0/token";
+        private const string UserInfoEndpoint = "https://openapi.baidu.com/rest/2.0/passport/users/getInfo";
+        private const string AuthEndpoint = "http://openapi.baidu.com/oauth/2.0/authorize";
+
+        private readonly ILogger _logger;
+        private readonly HttpClient _httpClient;
+
+        public BaiduAuthenticationHandler(HttpClient httpClient, ILogger logger)
+        {
+            _httpClient = httpClient;
+            _logger = logger;
+        }
+
+        protected override async Task<AuthenticationTicket> AuthenticateCoreAsync()
+        {
+            AuthenticationProperties properties = null;
+
+            try
+            {
+                string code = null;
+
+                var query = Request.Query;
+                var values = query.GetValues("code");
+                if (values != null && values.Count == 1)
+                {
+                    code = values[0];
+                }
+
+                var state = Request.Cookies[StateCookie];
+                properties = Options.StateDataFormat.Unprotect(state);
+                if (properties == null)
+                {
+                    return null;
+                }
+
+                // OAuth2 10.12 CSRF
+                if (!ValidateCorrelationId(properties, _logger))
+                {
+                    return new AuthenticationTicket(null, properties);
+                }
+
+                // Check for error
+                if (Request.Query.Get("error") != null)
+                    return new AuthenticationTicket(null, properties);
+
+                var requestPrefix = Request.Scheme + "://" + Request.Host;
+                var redirectUri = requestPrefix + Request.PathBase + Options.CallbackPath;
+
+                // Build up the body for the token request
+                var body = new List<KeyValuePair<string, string>>
+                {
+                    new KeyValuePair<string, string>("grant_type", "authorization_code"),
+                    new KeyValuePair<string, string>("code", code),
+                    new KeyValuePair<string, string>("redirect_uri", redirectUri),
+                    new KeyValuePair<string, string>("client_id", Options.ApiKey),
+                    new KeyValuePair<string, string>("client_secret", Options.SecretKey)
+                };
+
+                // Request the token
+                var tokenResponse =
+                    await _httpClient.PostAsync(TokenEndpoint, new FormUrlEncodedContent(body));
+                tokenResponse.EnsureSuccessStatusCode();
+                var text = await tokenResponse.Content.ReadAsStringAsync();
+
+                // Deserializes the token response
+                dynamic response = JsonConvert.DeserializeObject<dynamic>(text);
+                var accessToken = (string)response.access_token;
+
+                // Get the Baidu user
+                // http://developer.baidu.com/wiki/index.php?title=docs/oauth/rest/file_data_apis_list#.E8.BF.94.E5.9B.9E.E7.94.A8.E6.88.B7.E8.AF.A6.E7.BB.86.E8.B5.84.E6.96.99
+                var userResponse = await _httpClient.GetAsync(
+                    UserInfoEndpoint + "?access_token=" + Uri.EscapeDataString(accessToken), Request.CallCancelled);
+
+                userResponse.EnsureSuccessStatusCode();
+                text = await userResponse.Content.ReadAsStringAsync();
+                var user = JObject.Parse(text);
+
+                var context = new BaiduAuthenticatedContext(Context, user, accessToken)
+                {
+                    Identity = new ClaimsIdentity(
+                        Options.AuthenticationType,
+                        ClaimsIdentity.DefaultNameClaimType,
+                        ClaimsIdentity.DefaultRoleClaimType)
+                };
+                if (!string.IsNullOrEmpty(context.Userid))
+                {
+                    context.Identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, context.Userid, XmlSchemaString, Options.AuthenticationType));
+                }
+                if (!string.IsNullOrEmpty(context.UserName))
+                {
+                    context.Identity.AddClaim(new Claim(ClaimsIdentity.DefaultNameClaimType, context.UserName, XmlSchemaString, Options.AuthenticationType));
+                }
+                context.Properties = properties;
+
+                await Options.Provider.Authenticated(context);
+
+                return new AuthenticationTicket(context.Identity, context.Properties);
+            }
+            catch (Exception ex)
+            {
+                _logger.WriteError(ex.Message);
+            }
+            return new AuthenticationTicket(null, properties);
+        }
+
+        protected override Task ApplyResponseChallengeAsync()
+        {
+            if (Response.StatusCode != 401)
+            {
+                return Task.FromResult<object>(null);
+            }
+
+            var challenge = Helper.LookupChallenge(Options.AuthenticationType, Options.AuthenticationMode);
+
+            if (challenge == null) return Task.FromResult<object>(null);
+            var baseUri =
+                Request.Scheme +
+                Uri.SchemeDelimiter +
+                Request.Host +
+                Request.PathBase;
+
+            var currentUri =
+                baseUri +
+                Request.Path +
+                Request.QueryString;
+
+            var redirectUri =
+                baseUri +
+                Options.CallbackPath;
+
+            var properties = challenge.Properties;
+            if (string.IsNullOrEmpty(properties.RedirectUri))
+            {
+                properties.RedirectUri = currentUri;
+            }
+
+            // OAuth2 10.12 CSRF
+            GenerateCorrelationId(properties);
+
+            // comma separated
+            var scope = string.Join(" ", Options.Scope);
+
+            var state = Options.StateDataFormat.Protect(properties);
+
+            var authorizationEndpoint =
+                AuthEndpoint +
+                "?response_type=code" +
+                "&client_id=" + Uri.EscapeDataString(Options.ApiKey) +
+                "&redirect_uri=" + Uri.EscapeDataString(redirectUri) +
+                "&scope=" + Uri.EscapeDataString(scope) +
+                "&state=" + Uri.EscapeDataString(state);
+
+            var cookieOptions = new CookieOptions
+            {
+                HttpOnly = true,
+                Secure = Request.IsSecure
+            };
+
+            Response.StatusCode = 302;
+            Response.Cookies.Append(StateCookie, Options.StateDataFormat.Protect(properties), cookieOptions);
+            Response.Headers.Set("Location", authorizationEndpoint);
+
+            return Task.FromResult<object>(null);
+        }
+
+        public override async Task<bool> InvokeAsync()
+        {
+            return await InvokeReplyPathAsync();
+        }
+
+        private async Task<bool> InvokeReplyPathAsync()
+        {
+            if (!Options.CallbackPath.HasValue || Options.CallbackPath != Request.Path) return false;
+            // TODO: error responses
+
+            var ticket = await AuthenticateAsync();
+            if (ticket == null)
+            {
+                _logger.WriteWarning("Invalid return state, unable to redirect.");
+                Response.StatusCode = 500;
+                return true;
+            }
+
+            var context = new BaiduReturnEndpointContext(Context, ticket)
+            {
+                SignInAsAuthenticationType = Options.SignInAsAuthenticationType,
+                RedirectUri = ticket.Properties.RedirectUri
+            };
+
+            await Options.Provider.ReturnEndpoint(context);
+
+            if (context.SignInAsAuthenticationType != null &&
+                context.Identity != null)
+            {
+                var grantIdentity = context.Identity;
+                if (!string.Equals(grantIdentity.AuthenticationType, context.SignInAsAuthenticationType, StringComparison.Ordinal))
+                {
+                    grantIdentity = new ClaimsIdentity(grantIdentity.Claims, context.SignInAsAuthenticationType, grantIdentity.NameClaimType, grantIdentity.RoleClaimType);
+                }
+                Context.Authentication.SignIn(context.Properties, grantIdentity);
+            }
+
+            if (context.IsRequestCompleted || context.RedirectUri == null) return context.IsRequestCompleted;
+            var redirectUri = context.RedirectUri;
+            if (context.Identity == null)
+            {
+                // add a redirect hint that sign-in failed in some way
+                redirectUri = WebUtilities.AddQueryString(redirectUri, "error", "access_denied");
+            }
+            Response.Redirect(redirectUri);
+            context.RequestCompleted();
+
+            return context.IsRequestCompleted;
+        }
+    }
+}

src/Owin.Security.Providers.Baidu/BaiduAuthenticationMiddleware.cs

@@ -0,0 +1,82 @@
+using System;
+using System.Globalization;
+using System.Net.Http;
+using Microsoft.Owin;
+using Microsoft.Owin.Logging;
+using Microsoft.Owin.Security;
+using Microsoft.Owin.Security.DataHandler;
+using Microsoft.Owin.Security.DataProtection;
+using Microsoft.Owin.Security.Infrastructure;
+
+namespace Owin.Security.Providers.Baidu
+{
+    public class BaiduAuthenticationMiddleware : AuthenticationMiddleware<BaiduAuthenticationOptions>
+    {
+        private readonly HttpClient _httpClient;
+        private readonly ILogger _logger;
+
+        public BaiduAuthenticationMiddleware(OwinMiddleware next, IAppBuilder app,
+            BaiduAuthenticationOptions options)
+            : base(next, options)
+        {
+            if (string.IsNullOrWhiteSpace(Options.ApiKey))
+                throw new ArgumentException(string.Format(CultureInfo.CurrentCulture,
+                    Resources.Exception_OptionMustBeProvided, nameof(Options.ApiKey)));
+            if (string.IsNullOrWhiteSpace(Options.SecretKey))
+                throw new ArgumentException(string.Format(CultureInfo.CurrentCulture,
+                    Resources.Exception_OptionMustBeProvided, nameof(Options.SecretKey)));
+
+            _logger = app.CreateLogger<BaiduAuthenticationMiddleware>();
+
+            if (Options.Provider == null)
+                Options.Provider = new BaiduAuthenticationProvider();
+
+            if (Options.StateDataFormat == null)
+            {
+                var dataProtector = app.CreateDataProtector(
+                    typeof (BaiduAuthenticationMiddleware).FullName,
+                    Options.AuthenticationType, "v1");
+                Options.StateDataFormat = new PropertiesDataFormat(dataProtector);
+            }
+
+            if (string.IsNullOrEmpty(Options.SignInAsAuthenticationType))
+                Options.SignInAsAuthenticationType = app.GetDefaultSignInAsAuthenticationType();
+
+            _httpClient = new HttpClient(ResolveHttpMessageHandler(Options))
+            {
+                Timeout = Options.BackchannelTimeout,
+                MaxResponseContentBufferSize = 1024*1024*10
+            };
+        }
+
+        /// <summary>
+        ///     Provides the <see cref="T:Microsoft.Owin.Security.Infrastructure.AuthenticationHandler" /> object for processing
+        ///     authentication-related requests.
+        /// </summary>
+        /// <returns>
+        ///     An <see cref="T:Microsoft.Owin.Security.Infrastructure.AuthenticationHandler" /> configured with the
+        ///     <see cref="T:Owin.Security.Providers.Baidu.BaiduAuthenticationOptions" /> supplied to the constructor.
+        /// </returns>
+        protected override AuthenticationHandler<BaiduAuthenticationOptions> CreateHandler()
+        {
+            return new BaiduAuthenticationHandler(_httpClient, _logger);
+        }
+
+        private static HttpMessageHandler ResolveHttpMessageHandler(BaiduAuthenticationOptions options)
+        {
+            var handler = options.BackchannelHttpHandler ?? new WebRequestHandler();
+
+            // If they provided a validator, apply it or fail.
+            if (options.BackchannelCertificateValidator == null) return handler;
+            // Set the cert validate callback
+            var webRequestHandler = handler as WebRequestHandler;
+            if (webRequestHandler == null)
+            {
+                throw new InvalidOperationException(Resources.Exception_ValidatorHandlerMismatch);
+            }
+            webRequestHandler.ServerCertificateValidationCallback = options.BackchannelCertificateValidator.Validate;
+
+            return handler;
+        }
+    }
+}

src/Owin.Security.Providers.Baidu/BaiduAuthenticationOptions.cs

@@ -0,0 +1,102 @@
+using System;
+using System.Net.Http;
+using Microsoft.Owin;
+using Microsoft.Owin.Security;
+using System.Collections.Generic;
+
+namespace Owin.Security.Providers.Baidu
+{
+    public class BaiduAuthenticationOptions : AuthenticationOptions
+    {
+        /// <summary>
+        ///     Gets or sets the a pinned certificate validator to use to validate the endpoints used
+        ///     in back channel communications belong to Baidu
+        /// </summary>
+        /// <value>
+        ///     The pinned certificate validator.
+        /// </value>
+        /// <remarks>
+        ///     If this property is null then the default certificate checks are performed,
+        ///     validating the subject name and if the signing chain is a trusted party.
+        /// </remarks>
+        public ICertificateValidator BackchannelCertificateValidator { get; set; }
+
+        /// <summary>
+        ///     The HttpMessageHandler used to communicate with Baidu.
+        ///     This cannot be set at the same time as BackchannelCertificateValidator unless the value
+        ///     can be downcast to a WebRequestHandler.
+        /// </summary>
+        public HttpMessageHandler BackchannelHttpHandler { get; set; }
+
+        /// <summary>
+        ///     Gets or sets timeout value in milliseconds for back channel communications with Baidu.
+        /// </summary>
+        /// <value>
+        ///     The back channel timeout in milliseconds.
+        /// </value>
+        public TimeSpan BackchannelTimeout { get; set; }
+
+        /// <summary>
+        ///     The request path within the application's base path where the user-agent will be returned.
+        ///     The middleware will process this request when it arrives.
+        ///     Default value is "/signin-dropbox".
+        /// </summary>
+        public PathString CallbackPath { get; set; }
+
+        /// <summary>
+        ///     Get or sets the text that the user can display on a sign in user interface.
+        /// </summary>
+        public string Caption
+        {
+            get { return Description.Caption; }
+            set { Description.Caption = value; }
+        }
+
+        /// <summary>
+        /// Gets or sets the Baidu supplied API Key
+        /// </summary>
+        public string ApiKey { get; set; }
+
+        /// <summary>
+        /// Gets or sets the Baidu supplied Secret Key
+        /// </summary>
+        public string SecretKey { get; set; }
+        
+        /// <summary>
+        /// A list of permissions to request.
+        /// </summary>
+        public IList<string> Scope { get; private set; }
+
+        /// <summary>
+        ///     Gets or sets the <see cref="IBaiduAuthenticationProvider" /> used in the authentication events
+        /// </summary>
+        public IBaiduAuthenticationProvider Provider { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the name of another authentication middleware which will be responsible for actually issuing a user
+        ///     <see cref="System.Security.Claims.ClaimsIdentity" />.
+        /// </summary>
+        public string SignInAsAuthenticationType { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the type used to secure data handled by the middleware.
+        /// </summary>
+        public ISecureDataFormat<AuthenticationProperties> StateDataFormat { get; set; }
+
+        /// <summary>
+        ///     Initializes a new <see cref="BaiduAuthenticationOptions" />
+        /// </summary>
+        public BaiduAuthenticationOptions()
+            : base("Baidu")
+        {
+            Caption = Constants.DefaultAuthenticationType;
+            CallbackPath = new PathString("/signin-baidu");
+            AuthenticationMode = AuthenticationMode.Passive;
+            Scope = new List<string>
+            {
+                "basic"
+            };
+            BackchannelTimeout = TimeSpan.FromSeconds(60);
+        }
+    }
+}

src/Owin.Security.Providers.Baidu/Constants.cs

@@ -0,0 +1,7 @@
+namespace Owin.Security.Providers.Baidu
+{
+    internal static class Constants
+    {
+        public const string DefaultAuthenticationType = "Baidu";
+    }
+}

src/Owin.Security.Providers.Baidu/Owin.Security.Providers.Baidu.csproj

@@ -0,0 +1,104 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{E2759807-4D7C-4288-AAC8-F5B7B4616680}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Owin.Security.Providers.Baidu</RootNamespace>
+    <AssemblyName>Owin.Security.Providers.Baidu</AssemblyName>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Microsoft.Owin.3.0.1\lib\net45\Microsoft.Owin.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Microsoft.Owin.Security, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Microsoft.Owin.Security.3.0.1\lib\net45\Microsoft.Owin.Security.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Newtonsoft.Json, Version=8.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Newtonsoft.Json.8.0.3\lib\net45\Newtonsoft.Json.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Owin, Version=1.0.0.0, Culture=neutral, PublicKeyToken=f0ebd12fd5e55cc5, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Owin.1.0\lib\net40\Owin.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Net.Http.WebRequest" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Constants.cs" />
+    <Compile Include="BaiduAuthenticationExtensions.cs" />
+    <Compile Include="BaiduAuthenticationHandler.cs" />
+    <Compile Include="BaiduAuthenticationMiddleware.cs" />
+    <Compile Include="BaiduAuthenticationOptions.cs" />
+    <Compile Include="Provider\BaiduAuthenticatedContext.cs" />
+    <Compile Include="Provider\BaiduAuthenticationProvider.cs" />
+    <Compile Include="Provider\BaiduReturnEndpointContext.cs" />
+    <Compile Include="Provider\IBaiduAuthenticationProvider.cs" />
+    <Compile Include="Resources.Designer.cs">
+      <DependentUpon>Resources.resx</DependentUpon>
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+    </EmbeddedResource>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <Target Name="PostBuildMacros">
+    <GetAssemblyIdentity AssemblyFiles="$(TargetPath)">
+      <Output TaskParameter="Assemblies" ItemName="Targets" />
+    </GetAssemblyIdentity>
+    <ItemGroup>
+      <VersionNumber Include="@(Targets->'%(Version)')" />
+    </ItemGroup>
+  </Target>
+  <PropertyGroup>
+    <PreBuildEvent>
+    </PreBuildEvent>
+    <PostBuildEventDependsOn>
+      $(PostBuildEventDependsOn);
+      PostBuildMacros;
+    </PostBuildEventDependsOn>
+  </PropertyGroup>
+</Project>

src/Owin.Security.Providers.Baidu/Properties/AssemblyInfo.cs

@@ -0,0 +1,15 @@
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+[assembly: AssemblyTitle("Owin.Security.Providers.Baidu")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Owin.Security.Providers.Baidu")]
+[assembly: AssemblyCopyright("Copyright ©  2016")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+[assembly: ComVisible(false)]
+[assembly: Guid("AD2018C1-FA82-4DC3-8CD4-BCC4D232A678")]
+[assembly: AssemblyVersion("2.0.0.0")]
+[assembly: AssemblyFileVersion("2.0.0.0")]

src/Owin.Security.Providers.Baidu/Provider/BaiduAuthenticatedContext.cs

@@ -0,0 +1,77 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+using System.Security.Claims;
+using Microsoft.Owin;
+using Microsoft.Owin.Security;
+using Microsoft.Owin.Security.Provider;
+using Newtonsoft.Json.Linq;
+
+namespace Owin.Security.Providers.Baidu
+{
+    /// <summary>
+    /// Contains information about the login session as well as the user <see cref="System.Security.Claims.ClaimsIdentity"/>.
+    /// </summary>
+    public class BaiduAuthenticatedContext : BaseContext
+    {
+        /// <summary>
+        /// Initializes a <see cref="BaiduAuthenticatedContext"/>
+        /// </summary>
+        /// <param name="context">The OWIN environment</param>
+        /// <param name="user">The JSON-serialized user</param>
+        /// <param name="accessToken">Baidu Access token</param>
+        public BaiduAuthenticatedContext(IOwinContext context, JObject user, string accessToken)
+            : base(context)
+        {
+            AccessToken = accessToken;
+            User = user;
+
+            Userid = TryGetValue(user, "userid");
+            UserName = TryGetValue(user, "username");
+            RealName = TryGetValue(user, "realname");
+        }
+
+        /// <summary>
+        /// Gets the JSON-serialized user
+        /// </summary>
+        /// <remarks>
+        /// Contains the Baidu user obtained from the endpoint https://api.dropbox.com/1/account/info
+        /// </remarks>
+        public JObject User { get; private set; }
+
+        /// <summary>
+        /// Gets the Baidu OAuth access token
+        /// </summary>
+        public string AccessToken { get; private set; }
+
+        /// <summary>
+        /// Gets the Baidu user ID
+        /// </summary>
+        public string Userid { get; private set; }
+
+        /// <summary>
+        /// The name of the user
+        /// </summary>
+        public string UserName { get; private set; }
+
+        /// <summary>
+        /// The real name of the user
+        /// </summary>
+        public string RealName { get; private set; }
+
+        /// <summary>
+        /// Gets the <see cref="ClaimsIdentity"/> representing the user
+        /// </summary>
+        public ClaimsIdentity Identity { get; set; }
+
+        /// <summary>
+        /// Gets or sets a property bag for common authentication properties
+        /// </summary>
+        public AuthenticationProperties Properties { get; set; }
+
+        private static string TryGetValue(JObject user, string propertyName)
+        {
+            JToken value;
+            return user.TryGetValue(propertyName, out value) ? value.ToString() : null;
+        }
+    }
+}

src/Owin.Security.Providers.Baidu/Provider/BaiduAuthenticationProvider.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Threading.Tasks;
+
+namespace Owin.Security.Providers.Baidu
+{
+    /// <summary>
+    /// Default <see cref="IBaiduAuthenticationProvider"/> implementation.
+    /// </summary>
+    public class BaiduAuthenticationProvider : IBaiduAuthenticationProvider
+    {
+        /// <summary>
+        /// Initializes a <see cref="BaiduAuthenticationProvider"/>
+        /// </summary>
+        public BaiduAuthenticationProvider()
+        {
+            OnAuthenticated = context => Task.FromResult<object>(null);
+            OnReturnEndpoint = context => Task.FromResult<object>(null);
+        }
+
+        /// <summary>
+        /// Gets or sets the function that is invoked when the Authenticated method is invoked.
+        /// </summary>
+        public Func<BaiduAuthenticatedContext, Task> OnAuthenticated { get; set; }
+
+        /// <summary>
+        /// Gets or sets the function that is invoked when the ReturnEndpoint method is invoked.
+        /// </summary>
+        public Func<BaiduReturnEndpointContext, Task> OnReturnEndpoint { get; set; }
+
+        /// <summary>
+        /// Invoked whenever Baidu successfully authenticates a user
+        /// </summary>
+        /// <param name="context">Contains information about the login session as well as the user <see cref="System.Security.Claims.ClaimsIdentity"/>.</param>
+        /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
+        public virtual Task Authenticated(BaiduAuthenticatedContext context)
+        {
+            return OnAuthenticated(context);
+        }
+
+        /// <summary>
+        /// Invoked prior to the <see cref="System.Security.Claims.ClaimsIdentity"/> being saved in a local cookie and the browser being redirected to the originally requested URL.
+        /// </summary>
+        /// <param name="context"></param>
+        /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
+        public virtual Task ReturnEndpoint(BaiduReturnEndpointContext context)
+        {
+            return OnReturnEndpoint(context);
+        }
+    }
+}

src/Owin.Security.Providers.Baidu/Provider/BaiduReturnEndpointContext.cs

@@ -0,0 +1,26 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+using Microsoft.Owin;
+using Microsoft.Owin.Security;
+using Microsoft.Owin.Security.Provider;
+
+namespace Owin.Security.Providers.Baidu
+{
+    /// <summary>
+    /// Provides context information to middleware providers.
+    /// </summary>
+    public class BaiduReturnEndpointContext : ReturnEndpointContext
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="context">OWIN environment</param>
+        /// <param name="ticket">The authentication ticket</param>
+        public BaiduReturnEndpointContext(
+            IOwinContext context,
+            AuthenticationTicket ticket)
+            : base(context, ticket)
+        {
+        }
+    }
+}

src/Owin.Security.Providers.Baidu/Provider/IBaiduAuthenticationProvider.cs

@@ -0,0 +1,24 @@
+using System.Threading.Tasks;
+
+namespace Owin.Security.Providers.Baidu
+{
+    /// <summary>
+    /// Specifies callback methods which the <see cref="BaiduAuthenticationMiddleware"></see> invokes to enable developer control over the authentication process. />
+    /// </summary>
+    public interface IBaiduAuthenticationProvider
+    {
+        /// <summary>
+        /// Invoked whenever Baidu successfully authenticates a user
+        /// </summary>
+        /// <param name="context">Contains information about the login session as well as the user <see cref="System.Security.Claims.ClaimsIdentity"/>.</param>
+        /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
+        Task Authenticated(BaiduAuthenticatedContext context);
+
+        /// <summary>
+        /// Invoked prior to the <see cref="System.Security.Claims.ClaimsIdentity"/> being saved in a local cookie and the browser being redirected to the originally requested URL.
+        /// </summary>
+        /// <param name="context"></param>
+        /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
+        Task ReturnEndpoint(BaiduReturnEndpointContext context);
+    }
+}

src/Owin.Security.Providers.Baidu/Resources.Designer.cs

@@ -0,0 +1,81 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace Owin.Security.Providers.Baidu {
+    using System;
+    
+    
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "4.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Resources {
+        
+        private static global::System.Resources.ResourceManager resourceMan;
+        
+        private static global::System.Globalization.CultureInfo resourceCulture;
+        
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Resources() {
+        }
+        
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager {
+            get {
+                if (object.ReferenceEquals(resourceMan, null)) {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("Owin.Security.Providers.Baidu.Resources", typeof(Resources).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to The &apos;{0}&apos; option must be provided..
+        /// </summary>
+        internal static string Exception_OptionMustBeProvided {
+            get {
+                return ResourceManager.GetString("Exception_OptionMustBeProvided", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to An ICertificateValidator cannot be specified at the same time as an HttpMessageHandler unless it is a WebRequestHandler..
+        /// </summary>
+        internal static string Exception_ValidatorHandlerMismatch {
+            get {
+                return ResourceManager.GetString("Exception_ValidatorHandlerMismatch", resourceCulture);
+            }
+        }
+    }
+}

src/Owin.Security.Providers.Baidu/Resources.resx

@@ -0,0 +1,126 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="Exception_OptionMustBeProvided" xml:space="preserve">
+    <value>The '{0}' option must be provided.</value>
+  </data>
+  <data name="Exception_ValidatorHandlerMismatch" xml:space="preserve">
+    <value>An ICertificateValidator cannot be specified at the same time as an HttpMessageHandler unless it is a WebRequestHandler.</value>
+  </data>
+</root>

src/Owin.Security.Providers.Baidu/packages.config

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Microsoft.Owin" version="3.0.1" targetFramework="net45" />
+  <package id="Microsoft.Owin.Security" version="3.0.1" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="8.0.3" targetFramework="net45" />
+  <package id="Owin" version="1.0" targetFramework="net45" />
+</packages>

src/Owin.Security.Providers.BattleNet/Owin.Security.Providers.BattleNet.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.Bitbucket/Owin.Security.Providers.Bitbucket.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.Box/BoxAuthenticationExtensions.cs

@@ -0,0 +1,29 @@
+using System;
+
+namespace Owin.Security.Providers.Box
+{
+    public static class BoxAuthenticationExtensions
+    {
+        public static IAppBuilder UseBoxAuthentication(this IAppBuilder app,
+            BoxAuthenticationOptions options)
+        {
+            if (app == null)
+                throw new ArgumentNullException(nameof(app));
+            if (options == null)
+                throw new ArgumentNullException(nameof(options));
+
+            app.Use(typeof(BoxAuthenticationMiddleware), app, options);
+
+            return app;
+        }
+
+        public static IAppBuilder UseBoxAuthentication(this IAppBuilder app, string appKey, string appSecret)
+        {
+            return app.UseBoxAuthentication(new BoxAuthenticationOptions
+            {
+                ClientId = appKey,
+                ClientSecret = appSecret
+            });
+        }
+    }
+}

src/Owin.Security.Providers.Box/BoxAuthenticationHandler.cs

@@ -0,0 +1,230 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Security.Claims;
+using System.Threading.Tasks;
+using Microsoft.Owin;
+using Microsoft.Owin.Infrastructure;
+using Microsoft.Owin.Logging;
+using Microsoft.Owin.Security;
+using Microsoft.Owin.Security.Infrastructure;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using System.Net.Http.Headers;
+
+namespace Owin.Security.Providers.Box
+{
+    public class BoxAuthenticationHandler : AuthenticationHandler<BoxAuthenticationOptions>
+    {
+        private const string StateCookie = "_BoxState";
+        private const string XmlSchemaString = "http://www.w3.org/2001/XMLSchema#string";
+        private const string TokenEndpoint = "https://api.box.com/oauth2/token";
+        private const string UserInfoEndpoint = "https://api.box.com/2.0/users/me";
+
+        private readonly ILogger _logger;
+        private readonly HttpClient _httpClient;
+
+        public BoxAuthenticationHandler(HttpClient httpClient, ILogger logger)
+        {
+            _httpClient = httpClient;
+            _logger = logger;
+        }
+
+        protected override async Task<AuthenticationTicket> AuthenticateCoreAsync()
+        {
+            AuthenticationProperties properties = null;
+
+            try
+            {
+                string code = null;
+
+                var query = Request.Query;
+                var values = query.GetValues("code");
+                if (values != null && values.Count == 1)
+                {
+                    code = values[0];
+                }
+
+                var state = Request.Cookies[StateCookie];
+                properties = Options.StateDataFormat.Unprotect(state);
+                if (properties == null)
+                {
+                    return null;
+                }
+
+                // OAuth2 10.12 CSRF
+                if (!ValidateCorrelationId(properties, _logger))
+                {
+                    return new AuthenticationTicket(null, properties);
+                }
+
+                // Check for error
+                if (Request.Query.Get("error") != null)
+                    return new AuthenticationTicket(null, properties);
+
+                var requestPrefix = Request.Scheme + "://" + Request.Host;
+                var redirectUri = requestPrefix + Request.PathBase + Options.CallbackPath;
+
+                // Build up the body for the token request
+                var body = new List<KeyValuePair<string, string>>
+                {
+                    new KeyValuePair<string, string>("grant_type", "authorization_code"),
+                    new KeyValuePair<string, string>("code", code),
+                    new KeyValuePair<string, string>("redirect_uri", redirectUri),
+                    new KeyValuePair<string, string>("client_id", Options.ClientId),
+                    new KeyValuePair<string, string>("client_secret", Options.ClientSecret)
+                };
+
+                // Request the token
+                var tokenResponse =
+                    await _httpClient.PostAsync(TokenEndpoint, new FormUrlEncodedContent(body));
+                tokenResponse.EnsureSuccessStatusCode();
+                var text = await tokenResponse.Content.ReadAsStringAsync();
+
+                // Deserializes the token response
+                dynamic response = JsonConvert.DeserializeObject<dynamic>(text);
+                var accessToken = (string)response.access_token;
+
+                // Get the Box user
+                // https://docs.box.com/reference#get-the-current-users-information
+                var userRequest = new HttpRequestMessage(HttpMethod.Get, UserInfoEndpoint);
+                userRequest.Headers.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
+                userRequest.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
+                var userResponse = await _httpClient.SendAsync(userRequest, Request.CallCancelled);
+                userResponse.EnsureSuccessStatusCode();
+                text = await userResponse.Content.ReadAsStringAsync();
+                var user = JObject.Parse(text);
+
+                var context = new BoxAuthenticatedContext(Context, user, accessToken)
+                {
+                    Identity = new ClaimsIdentity(
+                        Options.AuthenticationType,
+                        ClaimsIdentity.DefaultNameClaimType,
+                        ClaimsIdentity.DefaultRoleClaimType)
+                };
+                if (!string.IsNullOrEmpty(context.Id))
+                {
+                    context.Identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, context.Id, XmlSchemaString, Options.AuthenticationType));
+                }
+                if (!string.IsNullOrEmpty(context.Name))
+                {
+                    context.Identity.AddClaim(new Claim(ClaimsIdentity.DefaultNameClaimType, context.Name, XmlSchemaString, Options.AuthenticationType));
+                }
+                context.Properties = properties;
+
+                await Options.Provider.Authenticated(context);
+
+                return new AuthenticationTicket(context.Identity, context.Properties);
+            }
+            catch (Exception ex)
+            {
+                _logger.WriteError(ex.Message);
+            }
+            return new AuthenticationTicket(null, properties);
+        }
+
+        protected override Task ApplyResponseChallengeAsync()
+        {
+            if (Response.StatusCode != 401)
+            {
+                return Task.FromResult<object>(null);
+            }
+
+            var challenge = Helper.LookupChallenge(Options.AuthenticationType, Options.AuthenticationMode);
+
+            if (challenge == null) return Task.FromResult<object>(null);
+            var baseUri =
+                Request.Scheme +
+                Uri.SchemeDelimiter +
+                Request.Host +
+                Request.PathBase;
+
+            var currentUri =
+                baseUri +
+                Request.Path +
+                Request.QueryString;
+
+            var redirectUri =
+                baseUri +
+                Options.CallbackPath;
+
+            var properties = challenge.Properties;
+            if (string.IsNullOrEmpty(properties.RedirectUri))
+            {
+                properties.RedirectUri = currentUri;
+            }
+
+            // OAuth2 10.12 CSRF
+            GenerateCorrelationId(properties);
+
+            var authorizationEndpoint =
+                "https://api.box.com/oauth2/authorize" +
+                "?response_type=code" +
+                "&client_id=" + Uri.EscapeDataString(Options.ClientId) +
+                "&state=authenticated" +
+                "&redirect_uri=" + Uri.EscapeDataString(redirectUri);
+
+            var cookieOptions = new CookieOptions
+            {
+                HttpOnly = true,
+                Secure = Request.IsSecure
+            };
+
+            Response.StatusCode = 302;
+            Response.Cookies.Append(StateCookie, Options.StateDataFormat.Protect(properties), cookieOptions);
+            Response.Headers.Set("Location", authorizationEndpoint);
+
+            return Task.FromResult<object>(null);
+        }
+
+        public override async Task<bool> InvokeAsync()
+        {
+            return await InvokeReplyPathAsync();
+        }
+
+        private async Task<bool> InvokeReplyPathAsync()
+        {
+            if (!Options.CallbackPath.HasValue || Options.CallbackPath != Request.Path) return false;
+            // TODO: error responses
+
+            var ticket = await AuthenticateAsync();
+            if (ticket == null)
+            {
+                _logger.WriteWarning("Invalid return state, unable to redirect.");
+                Response.StatusCode = 500;
+                return true;
+            }
+
+            var context = new BoxReturnEndpointContext(Context, ticket)
+            {
+                SignInAsAuthenticationType = Options.SignInAsAuthenticationType,
+                RedirectUri = ticket.Properties.RedirectUri
+            };
+
+            await Options.Provider.ReturnEndpoint(context);
+
+            if (context.SignInAsAuthenticationType != null &&
+                context.Identity != null)
+            {
+                var grantIdentity = context.Identity;
+                if (!string.Equals(grantIdentity.AuthenticationType, context.SignInAsAuthenticationType, StringComparison.Ordinal))
+                {
+                    grantIdentity = new ClaimsIdentity(grantIdentity.Claims, context.SignInAsAuthenticationType, grantIdentity.NameClaimType, grantIdentity.RoleClaimType);
+                }
+                Context.Authentication.SignIn(context.Properties, grantIdentity);
+            }
+
+            if (context.IsRequestCompleted || context.RedirectUri == null) return context.IsRequestCompleted;
+            var redirectUri = context.RedirectUri;
+            if (context.Identity == null)
+            {
+                // add a redirect hint that sign-in failed in some way
+                redirectUri = WebUtilities.AddQueryString(redirectUri, "error", "access_denied");
+            }
+            Response.Redirect(redirectUri);
+            context.RequestCompleted();
+
+            return context.IsRequestCompleted;
+        }
+    }
+}

src/Owin.Security.Providers.Box/BoxAuthenticationMiddleware.cs

@@ -0,0 +1,82 @@
+using System;
+using System.Globalization;
+using System.Net.Http;
+using Microsoft.Owin;
+using Microsoft.Owin.Logging;
+using Microsoft.Owin.Security;
+using Microsoft.Owin.Security.DataHandler;
+using Microsoft.Owin.Security.DataProtection;
+using Microsoft.Owin.Security.Infrastructure;
+
+namespace Owin.Security.Providers.Box
+{
+    public class BoxAuthenticationMiddleware : AuthenticationMiddleware<BoxAuthenticationOptions>
+    {
+        private readonly HttpClient _httpClient;
+        private readonly ILogger _logger;
+
+        public BoxAuthenticationMiddleware(OwinMiddleware next, IAppBuilder app,
+            BoxAuthenticationOptions options)
+            : base(next, options)
+        {
+            if (string.IsNullOrWhiteSpace(Options.ClientId))
+                throw new ArgumentException(string.Format(CultureInfo.CurrentCulture,
+                    Resources.Exception_OptionMustBeProvided, nameof(Options.ClientId)));
+            if (string.IsNullOrWhiteSpace(Options.ClientSecret))
+                throw new ArgumentException(string.Format(CultureInfo.CurrentCulture,
+                    Resources.Exception_OptionMustBeProvided, nameof(Options.ClientSecret)));
+
+            _logger = app.CreateLogger<BoxAuthenticationMiddleware>();
+
+            if (Options.Provider == null)
+                Options.Provider = new BoxAuthenticationProvider();
+
+            if (Options.StateDataFormat == null)
+            {
+                var dataProtector = app.CreateDataProtector(
+                    typeof (BoxAuthenticationMiddleware).FullName,
+                    Options.AuthenticationType, "v1");
+                Options.StateDataFormat = new PropertiesDataFormat(dataProtector);
+            }
+
+            if (string.IsNullOrEmpty(Options.SignInAsAuthenticationType))
+                Options.SignInAsAuthenticationType = app.GetDefaultSignInAsAuthenticationType();
+
+            _httpClient = new HttpClient(ResolveHttpMessageHandler(Options))
+            {
+                Timeout = Options.BackchannelTimeout,
+                MaxResponseContentBufferSize = 1024*1024*10
+            };
+        }
+
+        /// <summary>
+        ///     Provides the <see cref="T:Microsoft.Owin.Security.Infrastructure.AuthenticationHandler" /> object for processing
+        ///     authentication-related requests.
+        /// </summary>
+        /// <returns>
+        ///     An <see cref="T:Microsoft.Owin.Security.Infrastructure.AuthenticationHandler" /> configured with the
+        ///     <see cref="T:Owin.Security.Providers.Box.BoxAuthenticationOptions" /> supplied to the constructor.
+        /// </returns>
+        protected override AuthenticationHandler<BoxAuthenticationOptions> CreateHandler()
+        {
+            return new BoxAuthenticationHandler(_httpClient, _logger);
+        }
+
+        private static HttpMessageHandler ResolveHttpMessageHandler(BoxAuthenticationOptions options)
+        {
+            var handler = options.BackchannelHttpHandler ?? new WebRequestHandler();
+
+            // If they provided a validator, apply it or fail.
+            if (options.BackchannelCertificateValidator == null) return handler;
+            // Set the cert validate callback
+            var webRequestHandler = handler as WebRequestHandler;
+            if (webRequestHandler == null)
+            {
+                throw new InvalidOperationException(Resources.Exception_ValidatorHandlerMismatch);
+            }
+            webRequestHandler.ServerCertificateValidationCallback = options.BackchannelCertificateValidator.Validate;
+
+            return handler;
+        }
+    }
+}

src/Owin.Security.Providers.Box/BoxAuthenticationOptions.cs

@@ -0,0 +1,92 @@
+using System;
+using System.Net.Http;
+using Microsoft.Owin;
+using Microsoft.Owin.Security;
+
+namespace Owin.Security.Providers.Box
+{
+    public class BoxAuthenticationOptions : AuthenticationOptions
+    {
+        /// <summary>
+        ///     Gets or sets the a pinned certificate validator to use to validate the endpoints used
+        ///     in back channel communications belong to Box
+        /// </summary>
+        /// <value>
+        ///     The pinned certificate validator.
+        /// </value>
+        /// <remarks>
+        ///     If this property is null then the default certificate checks are performed,
+        ///     validating the subject name and if the signing chain is a trusted party.
+        /// </remarks>
+        public ICertificateValidator BackchannelCertificateValidator { get; set; }
+
+        /// <summary>
+        ///     The HttpMessageHandler used to communicate with Box.
+        ///     This cannot be set at the same time as BackchannelCertificateValidator unless the value
+        ///     can be downcast to a WebRequestHandler.
+        /// </summary>
+        public HttpMessageHandler BackchannelHttpHandler { get; set; }
+
+        /// <summary>
+        ///     Gets or sets timeout value in milliseconds for back channel communications with Box.
+        /// </summary>
+        /// <value>
+        ///     The back channel timeout in milliseconds.
+        /// </value>
+        public TimeSpan BackchannelTimeout { get; set; }
+
+        /// <summary>
+        ///     The request path within the application's base path where the user-agent will be returned.
+        ///     The middleware will process this request when it arrives.
+        ///     Default value is "/signin-box".
+        /// </summary>
+        public PathString CallbackPath { get; set; }
+
+        /// <summary>
+        ///     Get or sets the text that the user can display on a sign in user interface.
+        /// </summary>
+        public string Caption
+        {
+            get { return Description.Caption; }
+            set { Description.Caption = value; }
+        }
+
+        /// <summary>
+        ///     Gets or sets the Box supplied Client ID
+        /// </summary>
+        public string ClientId { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the Box supplied Client Secret
+        /// </summary>
+        public string ClientSecret { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the <see cref="IBoxAuthenticationProvider" /> used in the authentication events
+        /// </summary>
+        public IBoxAuthenticationProvider Provider { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the name of another authentication middleware which will be responsible for actually issuing a user
+        ///     <see cref="System.Security.Claims.ClaimsIdentity" />.
+        /// </summary>
+        public string SignInAsAuthenticationType { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the type used to secure data handled by the middleware.
+        /// </summary>
+        public ISecureDataFormat<AuthenticationProperties> StateDataFormat { get; set; }
+
+        /// <summary>
+        ///     Initializes a new <see cref="BoxAuthenticationOptions" />
+        /// </summary>
+        public BoxAuthenticationOptions()
+            : base("Box")
+        {
+            Caption = Constants.DefaultAuthenticationType;
+            CallbackPath = new PathString("/signin-box");
+            AuthenticationMode = AuthenticationMode.Passive;
+            BackchannelTimeout = TimeSpan.FromSeconds(60);
+        }
+    }
+}

src/Owin.Security.Providers.Box/Constants.cs

@@ -0,0 +1,7 @@
+namespace Owin.Security.Providers.Box
+{
+    internal static class Constants
+    {
+        public const string DefaultAuthenticationType = "Box";
+    }
+}

src/Owin.Security.Providers.Box/Owin.Security.Providers.Box.csproj

@@ -0,0 +1,104 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{1AEF8813-E1F9-41E1-BC8D-732960595E9F}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Owin.Security.Providers.Box</RootNamespace>
+    <AssemblyName>Owin.Security.Providers.Box</AssemblyName>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Microsoft.Owin.3.0.1\lib\net45\Microsoft.Owin.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Microsoft.Owin.Security, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Microsoft.Owin.Security.3.0.1\lib\net45\Microsoft.Owin.Security.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Newtonsoft.Json, Version=8.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Newtonsoft.Json.8.0.3\lib\net45\Newtonsoft.Json.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Owin, Version=1.0.0.0, Culture=neutral, PublicKeyToken=f0ebd12fd5e55cc5, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Owin.1.0\lib\net40\Owin.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Net.Http.WebRequest" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Constants.cs" />
+    <Compile Include="BoxAuthenticationExtensions.cs" />
+    <Compile Include="BoxAuthenticationHandler.cs" />
+    <Compile Include="BoxAuthenticationMiddleware.cs" />
+    <Compile Include="BoxAuthenticationOptions.cs" />
+    <Compile Include="Provider\BoxAuthenticatedContext.cs" />
+    <Compile Include="Provider\BoxAuthenticationProvider.cs" />
+    <Compile Include="Provider\BoxReturnEndpointContext.cs" />
+    <Compile Include="Provider\IBoxAuthenticationProvider.cs" />
+    <Compile Include="Resources.Designer.cs">
+      <DependentUpon>Resources.resx</DependentUpon>
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+    </EmbeddedResource>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <Target Name="PostBuildMacros">
+    <GetAssemblyIdentity AssemblyFiles="$(TargetPath)">
+      <Output TaskParameter="Assemblies" ItemName="Targets" />
+    </GetAssemblyIdentity>
+    <ItemGroup>
+      <VersionNumber Include="@(Targets->'%(Version)')" />
+    </ItemGroup>
+  </Target>
+  <PropertyGroup>
+    <PreBuildEvent>
+    </PreBuildEvent>
+    <PostBuildEventDependsOn>
+      $(PostBuildEventDependsOn);
+      PostBuildMacros;
+    </PostBuildEventDependsOn>
+  </PropertyGroup>
+</Project>

src/Owin.Security.Providers.Box/Properties/AssemblyInfo.cs

@@ -0,0 +1,15 @@
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+[assembly: AssemblyTitle("Owin.Security.Providers.Box")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Owin.Security.Providers.Box")]
+[assembly: AssemblyCopyright("Copyright ©  2016")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+[assembly: ComVisible(false)]
+[assembly: Guid("1242F9A5-AEF8-44F8-A255-F0D24DAE0A2C")]
+[assembly: AssemblyVersion("2.0.0.0")]
+[assembly: AssemblyFileVersion("2.0.0.0")]

src/Owin.Security.Providers.Box/Provider/BoxAuthenticatedContext.cs

@@ -0,0 +1,77 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+using System.Security.Claims;
+using Microsoft.Owin;
+using Microsoft.Owin.Security;
+using Microsoft.Owin.Security.Provider;
+using Newtonsoft.Json.Linq;
+
+namespace Owin.Security.Providers.Box
+{
+    /// <summary>
+    /// Contains information about the login session as well as the user <see cref="System.Security.Claims.ClaimsIdentity"/>.
+    /// </summary>
+    public class BoxAuthenticatedContext : BaseContext
+    {
+        /// <summary>
+        /// Initializes a <see cref="BoxAuthenticatedContext"/>
+        /// </summary>
+        /// <param name="context">The OWIN environment</param>
+        /// <param name="user">The JSON-serialized user</param>
+        /// <param name="accessToken">Box Access token</param>
+        public BoxAuthenticatedContext(IOwinContext context, JObject user, string accessToken)
+            : base(context)
+        {
+            AccessToken = accessToken;
+            User = user;
+
+            Id = TryGetValue(user, "id");
+            Name = TryGetValue(user, "name");
+            Login = TryGetValue(user, "login");
+        }
+
+        /// <summary>
+        /// Gets the JSON-serialized user
+        /// </summary>
+        /// <remarks>
+        /// Contains the Box user obtained from the endpoint https://api.box.com/2.0/users/me
+        /// </remarks>
+        public JObject User { get; private set; }
+
+        /// <summary>
+        /// Gets the Box OAuth access token
+        /// </summary>
+        public string AccessToken { get; private set; }
+
+        /// <summary>
+        /// Gets the Box user ID
+        /// </summary>
+        public string Id { get; private set; }
+
+        /// <summary>
+        /// The name of the user
+        /// </summary>
+        public string Name { get; private set; }
+
+        /// <summary>
+        /// The login of the user
+        /// </summary>
+        public string Login { get; private set; }
+
+        /// <summary>
+        /// Gets the <see cref="ClaimsIdentity"/> representing the user
+        /// </summary>
+        public ClaimsIdentity Identity { get; set; }
+
+        /// <summary>
+        /// Gets or sets a property bag for common authentication properties
+        /// </summary>
+        public AuthenticationProperties Properties { get; set; }
+
+        private static string TryGetValue(JObject user, string propertyName)
+        {
+            JToken value;
+            return user.TryGetValue(propertyName, out value) ? value.ToString() : null;
+        }
+    }
+}

src/Owin.Security.Providers.Box/Provider/BoxAuthenticationProvider.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Threading.Tasks;
+
+namespace Owin.Security.Providers.Box
+{
+    /// <summary>
+    /// Default <see cref="IBoxAuthenticationProvider"/> implementation.
+    /// </summary>
+    public class BoxAuthenticationProvider : IBoxAuthenticationProvider
+    {
+        /// <summary>
+        /// Initializes a <see cref="BoxAuthenticationProvider"/>
+        /// </summary>
+        public BoxAuthenticationProvider()
+        {
+            OnAuthenticated = context => Task.FromResult<object>(null);
+            OnReturnEndpoint = context => Task.FromResult<object>(null);
+        }
+
+        /// <summary>
+        /// Gets or sets the function that is invoked when the Authenticated method is invoked.
+        /// </summary>
+        public Func<BoxAuthenticatedContext, Task> OnAuthenticated { get; set; }
+
+        /// <summary>
+        /// Gets or sets the function that is invoked when the ReturnEndpoint method is invoked.
+        /// </summary>
+        public Func<BoxReturnEndpointContext, Task> OnReturnEndpoint { get; set; }
+
+        /// <summary>
+        /// Invoked whenever Box successfully authenticates a user
+        /// </summary>
+        /// <param name="context">Contains information about the login session as well as the user <see cref="System.Security.Claims.ClaimsIdentity"/>.</param>
+        /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
+        public virtual Task Authenticated(BoxAuthenticatedContext context)
+        {
+            return OnAuthenticated(context);
+        }
+
+        /// <summary>
+        /// Invoked prior to the <see cref="System.Security.Claims.ClaimsIdentity"/> being saved in a local cookie and the browser being redirected to the originally requested URL.
+        /// </summary>
+        /// <param name="context"></param>
+        /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
+        public virtual Task ReturnEndpoint(BoxReturnEndpointContext context)
+        {
+            return OnReturnEndpoint(context);
+        }
+    }
+}

src/Owin.Security.Providers.Box/Provider/BoxReturnEndpointContext.cs

@@ -0,0 +1,26 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+using Microsoft.Owin;
+using Microsoft.Owin.Security;
+using Microsoft.Owin.Security.Provider;
+
+namespace Owin.Security.Providers.Box
+{
+    /// <summary>
+    /// Provides context information to middleware providers.
+    /// </summary>
+    public class BoxReturnEndpointContext : ReturnEndpointContext
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="context">OWIN environment</param>
+        /// <param name="ticket">The authentication ticket</param>
+        public BoxReturnEndpointContext(
+            IOwinContext context,
+            AuthenticationTicket ticket)
+            : base(context, ticket)
+        {
+        }
+    }
+}

src/Owin.Security.Providers.Box/Provider/IBoxAuthenticationProvider.cs

@@ -0,0 +1,24 @@
+using System.Threading.Tasks;
+
+namespace Owin.Security.Providers.Box
+{
+    /// <summary>
+    /// Specifies callback methods which the <see cref="BoxAuthenticationMiddleware"></see> invokes to enable developer control over the authentication process. />
+    /// </summary>
+    public interface IBoxAuthenticationProvider
+    {
+        /// <summary>
+        /// Invoked whenever Box successfully authenticates a user
+        /// </summary>
+        /// <param name="context">Contains information about the login session as well as the user <see cref="System.Security.Claims.ClaimsIdentity"/>.</param>
+        /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
+        Task Authenticated(BoxAuthenticatedContext context);
+
+        /// <summary>
+        /// Invoked prior to the <see cref="System.Security.Claims.ClaimsIdentity"/> being saved in a local cookie and the browser being redirected to the originally requested URL.
+        /// </summary>
+        /// <param name="context"></param>
+        /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
+        Task ReturnEndpoint(BoxReturnEndpointContext context);
+    }
+}

src/Owin.Security.Providers.Box/Resources.Designer.cs

@@ -0,0 +1,81 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace Owin.Security.Providers.Box {
+    using System;
+    
+    
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "4.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Resources {
+        
+        private static global::System.Resources.ResourceManager resourceMan;
+        
+        private static global::System.Globalization.CultureInfo resourceCulture;
+        
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Resources() {
+        }
+        
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager {
+            get {
+                if (object.ReferenceEquals(resourceMan, null)) {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("Owin.Security.Providers.Box.Resources", typeof(Resources).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to The &apos;{0}&apos; option must be provided..
+        /// </summary>
+        internal static string Exception_OptionMustBeProvided {
+            get {
+                return ResourceManager.GetString("Exception_OptionMustBeProvided", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to An ICertificateValidator cannot be specified at the same time as an HttpMessageHandler unless it is a WebRequestHandler..
+        /// </summary>
+        internal static string Exception_ValidatorHandlerMismatch {
+            get {
+                return ResourceManager.GetString("Exception_ValidatorHandlerMismatch", resourceCulture);
+            }
+        }
+    }
+}

src/Owin.Security.Providers.Box/Resources.resx

@@ -0,0 +1,126 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="Exception_OptionMustBeProvided" xml:space="preserve">
+    <value>The '{0}' option must be provided.</value>
+  </data>
+  <data name="Exception_ValidatorHandlerMismatch" xml:space="preserve">
+    <value>An ICertificateValidator cannot be specified at the same time as an HttpMessageHandler unless it is a WebRequestHandler.</value>
+  </data>
+</root>

src/Owin.Security.Providers.Box/packages.config

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Microsoft.Owin" version="3.0.1" targetFramework="net45" />
+  <package id="Microsoft.Owin.Security" version="3.0.1" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="8.0.3" targetFramework="net45" />
+  <package id="Owin" version="1.0" targetFramework="net45" />
+</packages>

src/Owin.Security.Providers.Buffer/Owin.Security.Providers.Buffer.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.Cosign/Owin.Security.Providers.Cosign.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.DeviantArt/Owin.Security.Providers.DeviantArt.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.Discord/DiscordAuthenticationHandler.cs

@@ -105,7 +105,7 @@ namespace Owin.Security.Providers.Discord
                 };
                 if (!string.IsNullOrEmpty(context.Id))
                 {
-                    context.Identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, context.UserName, XmlSchemaString, Options.AuthenticationType));
+                    context.Identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, context.Id, XmlSchemaString, Options.AuthenticationType));
                 }
                 if (!string.IsNullOrEmpty(context.UserName))
                 {

src/Owin.Security.Providers.Discord/Owin.Security.Providers.Discord.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.Discord/Provider/DiscordAuthenticatedContext.cs

@@ -39,7 +39,7 @@ namespace Owin.Security.Providers.Discord.Provider
             Discriminator = TryGetValue(user, "discriminator");
             Avatar = TryGetValue(user, "avatar");
             Email = TryGetValue(user, "email");
-            Verified = TryGetValue(user, "verified") == "true";
+            Verified = TryGetValue(user, "verified").ToLowerInvariant() == "true";
         }
 
         public string RefreshToken { get; set; }

src/Owin.Security.Providers.DoYouBuzz/Owin.Security.Providers.DoYouBuzz.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.Dropbox/DropboxAuthenticationHandler.cs

@@ -17,8 +17,9 @@ namespace Owin.Security.Providers.Dropbox
     {
         private const string StateCookie = "_DropboxState";
         private const string XmlSchemaString = "http://www.w3.org/2001/XMLSchema#string";
-        private const string TokenEndpoint = "https://api.dropbox.com/1/oauth2/token";
-        private const string UserInfoEndpoint = "https://api.dropbox.com/1/account/info";
+        private const string TokenEndpoint = "https://api.dropbox.com/oauth2/token";
+        private const string UserInfoEndpoint = "https://api.dropbox.com/2/users/get_current_account";
+
 
         private readonly ILogger _logger;
         private readonly HttpClient _httpClient;
@@ -65,13 +66,13 @@ namespace Owin.Security.Providers.Dropbox
                 var redirectUri = requestPrefix + Request.PathBase + Options.CallbackPath;
 
                 // Build up the body for the token request
-                var body = new List<KeyValuePair<string, string>>
+                var body = new Dictionary<string, string>
                 {
-                    new KeyValuePair<string, string>("grant_type", "authorization_code"),
-                    new KeyValuePair<string, string>("code", code),
-                    new KeyValuePair<string, string>("redirect_uri", redirectUri),
-                    new KeyValuePair<string, string>("client_id", Options.AppKey),
-                    new KeyValuePair<string, string>("client_secret", Options.AppSecret)
+                    { "grant_type", "authorization_code" },
+                    { "code", code },
+                    {"redirect_uri", redirectUri },
+                    { "client_id", Options.AppKey },
+                    { "client_secret", Options.AppSecret }
                 };
 
                 // Request the token
@@ -85,8 +86,8 @@ namespace Owin.Security.Providers.Dropbox
                 var accessToken = (string)response.access_token;
 
                 // Get the Dropbox user
-                var graphResponse = await _httpClient.GetAsync(
-                    UserInfoEndpoint + "?access_token=" + Uri.EscapeDataString(accessToken), Request.CallCancelled);
+                _httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", accessToken);
+                var graphResponse = await _httpClient.PostAsync(UserInfoEndpoint, null);
                 graphResponse.EnsureSuccessStatusCode();
                 text = await graphResponse.Content.ReadAsStringAsync();
                 var user = JObject.Parse(text);
@@ -154,7 +155,7 @@ namespace Owin.Security.Providers.Dropbox
             GenerateCorrelationId(properties);
 
             var authorizationEndpoint =
-                "https://www.dropbox.com/1/oauth2/authorize" +
+                "https://www.dropbox.com/oauth2/authorize" +
                 "?response_type=code" +
                 "&client_id=" + Uri.EscapeDataString(Options.AppKey) +
                 "&redirect_uri=" + Uri.EscapeDataString(redirectUri);

src/Owin.Security.Providers.Dropbox/Owin.Security.Providers.Dropbox.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.Dropbox/Provider/DropboxAuthenticatedContext.cs

@@ -25,7 +25,7 @@ namespace Owin.Security.Providers.Dropbox
             AccessToken = accessToken;
             User = user;
 
-            Id = TryGetValue(user, "uid");
+            Id = TryGetValue(user, "account_id");
             Name = TryGetValue(user, "display_name");
         }
 

src/Owin.Security.Providers.EVEOnline/Owin.Security.Providers.EVEOnline.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.Evernote/Constants.cs

@@ -0,0 +1,7 @@
+namespace Owin.Security.Providers.Evernote
+{
+    internal static class Constants
+    {
+        public const string DefaultAuthenticationType = "Evernote";
+    }
+}

src/Owin.Security.Providers.Evernote/EvernoteAuthenticationExtensions.cs

@@ -0,0 +1,29 @@
+using System;
+
+namespace Owin.Security.Providers.Evernote
+{
+    public static class EvernoteAuthenticationExtensions
+    {
+        public static IAppBuilder UseEvernoteAuthentication(this IAppBuilder app,
+            EvernoteAuthenticationOptions options)
+        {
+            if (app == null)
+                throw new ArgumentNullException(nameof(app));
+            if (options == null)
+                throw new ArgumentNullException(nameof(options));
+
+            app.Use(typeof(EvernoteAuthenticationMiddleware), app, options);
+
+            return app;
+        }
+
+        public static IAppBuilder UseEvernoteAuthentication(this IAppBuilder app, string appKey, string appSecret)
+        {
+            return app.UseEvernoteAuthentication(new EvernoteAuthenticationOptions
+            {
+                AppKey = appKey,
+                AppSecret = appSecret
+            });
+        }
+    }
+}

src/Owin.Security.Providers.Evernote/EvernoteAuthenticationHandler.cs

@@ -0,0 +1,379 @@
+using EvernoteSDK;
+using Microsoft.Owin;
+using Microsoft.Owin.Infrastructure;
+using Microsoft.Owin.Logging;
+using Microsoft.Owin.Security;
+using Microsoft.Owin.Security.Infrastructure;
+using Owin.Security.Providers.Evernote.Messages;
+using System;
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.Net.Http;
+using System.Security.Claims;
+using System.Text;
+using System.Threading.Tasks;
+using System.Web;
+
+namespace Owin.Security.Providers.Evernote
+{
+    public class EvernoteAuthenticationHandler : AuthenticationHandler<EvernoteAuthenticationOptions>
+    {
+        private const string StateCookie = "_EvernoteState";
+        private const string XmlSchemaString = "http://www.w3.org/2001/XMLSchema#string";
+
+        private const string RequestTokenEndpoint = "/oauth";
+        private const string AuthenticationEndpoint = "/OAuth.action?oauth_token=";
+        private const string AccessTokenEndpoint = "/oauth";
+
+        private const string ProductionBase = "https://www.evernote.com";
+        private const string SandBoxBase = "https://sandbox.evernote.com";
+
+        public string BaseUri => Options.IsSandBox ? SandBoxBase : ProductionBase;
+
+        private readonly ILogger _logger;
+        private readonly HttpClient _httpClient;
+
+        public EvernoteAuthenticationHandler(HttpClient httpClient, ILogger logger)
+        {
+            _httpClient = httpClient;
+            _logger = logger;
+
+            _logger.WriteInformation("Authentication Handler initialized");
+        }
+
+        public override async Task<bool> InvokeAsync()
+        {
+            if (Options.CallbackPath.HasValue && Options.CallbackPath == Request.Path)
+            {
+                return await InvokeReturnPathAsync();
+            }
+            return false;
+        }
+
+        protected override async Task<AuthenticationTicket> AuthenticateCoreAsync()
+        {
+            AuthenticationProperties properties = null;
+
+            try
+            {
+                var query = Request.Query;
+                var protectedRequestToken = Request.Cookies[StateCookie];
+
+                var requestToken = Options.StateDataFormat.Unprotect(protectedRequestToken);
+
+                if (requestToken == null)
+                {
+                    _logger.WriteWarning("Invalid state");
+                    return null;
+                }
+
+                properties = requestToken.Properties;
+
+                var returnedToken = query.Get("oauth_token");
+                if (string.IsNullOrWhiteSpace(returnedToken))
+                {
+                    _logger.WriteWarning("Missing oauth_token");
+                    return new AuthenticationTicket(null, properties);
+                }
+
+                if (returnedToken != requestToken.Token)
+                {
+                    _logger.WriteWarning("Unmatched token");
+                    return new AuthenticationTicket(null, properties);
+                }
+
+                var oauthVerifier = query.Get("oauth_verifier");
+                if (string.IsNullOrWhiteSpace(oauthVerifier))
+                {
+                    _logger.WriteWarning("Missing or blank oauth_verifier");
+                    return new AuthenticationTicket(null, properties);
+                }
+
+                // Retrieve access token
+                var accessToken = await ObtainAccessTokenAsync(Options.AppKey, Options.AppSecret, requestToken, oauthVerifier);
+
+                // Retrieve user infos
+                var userName = GetUserInfos(accessToken);
+
+                var context = new EvernoteAuthenticatedContext(Context, accessToken)
+                {
+                    Identity = new ClaimsIdentity(
+                        Options.AuthenticationType,
+                        ClaimsIdentity.DefaultNameClaimType,
+                        ClaimsIdentity.DefaultRoleClaimType)
+                };
+
+                if (!string.IsNullOrEmpty(context.UserId))
+                {
+                    context.Identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, context.UserId, XmlSchemaString, Options.AuthenticationType));
+                }
+
+                if (!string.IsNullOrEmpty(userName))
+                {
+                    context.Identity.AddClaim(new Claim(ClaimTypes.Name, userName, XmlSchemaString, Options.AuthenticationType));
+                }
+
+                if (!string.IsNullOrEmpty(context.NoteStoreUrl))
+                {
+                    context.Identity.AddClaim(new Claim("urn:evernote:notestoreuri", context.NoteStoreUrl, XmlSchemaString, Options.AuthenticationType));
+                }
+
+                if (!string.IsNullOrEmpty(context.AccessToken))
+                {
+                    context.Identity.AddClaim(new Claim("urn:evernote:accesstoken", context.AccessToken, XmlSchemaString, Options.AuthenticationType));
+                }
+
+                context.Properties = requestToken.Properties;
+
+                Response.Cookies.Delete(StateCookie);
+
+                await Options.Provider.Authenticated(context);
+
+                return new AuthenticationTicket(context.Identity, context.Properties);
+            }
+            catch (Exception ex)
+            {
+                _logger.WriteError("Authentication failed", ex);
+                return new AuthenticationTicket(null, properties);
+            }
+        }
+
+        private string GetUserInfos(AccessToken accessToken)
+        {
+            ENSession.SetSharedSessionDeveloperToken(accessToken.Token, accessToken.NoteStoreUrl);
+            var session = new ENSession();
+            session.PerformPostAuthentication();
+            return session.UserDisplayName;
+        }
+
+        protected override async Task ApplyResponseChallengeAsync()
+        {
+            _logger.WriteInformation("Applying response challenge");
+
+            if (Response.StatusCode != 401)
+            {
+                return;
+            }
+
+            var challenge = Helper.LookupChallenge(Options.AuthenticationType, Options.AuthenticationMode);
+
+            if (challenge == null) return;
+
+            var baseUri =
+                Request.Scheme +
+                Uri.SchemeDelimiter +
+                Request.Host +
+                Request.PathBase;
+
+            var callBackUri = baseUri + Options.CallbackPath;
+
+            var properties = challenge.Properties;
+            if (string.IsNullOrEmpty(properties.RedirectUri))
+            {
+                properties.RedirectUri = baseUri + Request.Path + Request.QueryString;
+            }
+
+            _logger.WriteInformation("Requesting Token...");
+
+            var requestToken = await ObtainRequestTokenAsync(Options.AppKey, Options.AppSecret, callBackUri, properties);
+
+            _logger.WriteInformation("Token request successfull. Token: " + requestToken.Token);
+
+            var authorizationEndpoint = BaseUri + AuthenticationEndpoint + requestToken.Token;
+
+            if (requestToken.CallbackConfirmed)
+            {
+                var cookieOptions = new CookieOptions
+                {
+                    HttpOnly = true,
+                    Secure = Request.IsSecure
+                };
+
+                Response.StatusCode = 302;
+                Response.Cookies.Append(StateCookie, Options.StateDataFormat.Protect(requestToken), cookieOptions);
+                Response.Headers.Set("Location", authorizationEndpoint);
+            }
+            else
+            {
+                _logger.WriteError("requestToken CallbackConfirmed!=true");
+            }
+        }
+
+        private async Task<RequestToken> ObtainRequestTokenAsync(string appKey, string appSecret, string callBackUri, AuthenticationProperties properties)
+        {
+            string normalizedUrl;
+            string normalizedRequestParameters;
+
+            var oauthBase = new OAuthBase();
+            var url = new Uri(BaseUri + RequestTokenEndpoint);
+            var signature = oauthBase.GenerateSignature(
+                url,
+                appKey,
+                appSecret,
+                null,
+                null,
+                "GET",
+                oauthBase.GenerateTimeStamp(),
+                oauthBase.GenerateNonce(),
+                callBackUri, out normalizedUrl, out normalizedRequestParameters);
+
+            normalizedRequestParameters = normalizedRequestParameters + "&oauth_signature=" + HttpUtility.UrlEncode(signature);
+
+            if (normalizedRequestParameters.Length > 0)
+                normalizedUrl += "?";
+
+            var authorizationEndpoint = normalizedUrl + normalizedRequestParameters;
+
+            _logger.WriteInformation("Url =" + authorizationEndpoint);
+
+            string query = await WebRequestAsync(HttpMethod.Get, authorizationEndpoint, null);
+
+            if (query?.Length > 0)
+            {
+                NameValueCollection queryString = HttpUtility.ParseQueryString(query);
+                if (queryString["oauth_token"] != null)
+                {
+                    _logger.WriteInformation("Retrieving data...");
+
+                    return new RequestToken
+                    {
+                        Token = Uri.UnescapeDataString(queryString["oauth_token"]),
+                        CallbackConfirmed = true,
+                        Properties = properties
+                    };
+                }
+            }
+
+            return new RequestToken();
+        }
+
+        private async Task<bool> InvokeReturnPathAsync()
+        {
+            if (!Options.CallbackPath.HasValue || Options.CallbackPath != Request.Path) return false;
+            // TODO: error responses
+
+            var ticket = await AuthenticateAsync();
+            if (ticket == null)
+            {
+                _logger.WriteWarning("Invalid return state, unable to redirect.");
+                Response.StatusCode = 500;
+                return true;
+            }
+
+            var context = new EvernoteReturnEndpointContext(Context, ticket)
+            {
+                SignInAsAuthenticationType = Options.SignInAsAuthenticationType,
+                RedirectUri = ticket.Properties.RedirectUri
+            };
+
+            await Options.Provider.ReturnEndpoint(context);
+
+            if (context.SignInAsAuthenticationType != null && context.Identity != null)
+            {
+                var grantIdentity = context.Identity;
+                if (!string.Equals(grantIdentity.AuthenticationType, context.SignInAsAuthenticationType, StringComparison.Ordinal))
+                {
+                    grantIdentity = new ClaimsIdentity(grantIdentity.Claims, context.SignInAsAuthenticationType, grantIdentity.NameClaimType, grantIdentity.RoleClaimType);
+                }
+                Context.Authentication.SignIn(context.Properties, grantIdentity);
+            }
+
+            if (context.IsRequestCompleted || context.RedirectUri == null) return context.IsRequestCompleted;
+
+            var redirectUri = context.RedirectUri;
+
+            if (context.Identity == null)
+            {
+                // add a redirect hint that sign-in failed in some way
+                redirectUri = WebUtilities.AddQueryString(redirectUri, "error", "access_denied");
+            }
+            Response.Redirect(redirectUri);
+            context.RequestCompleted();
+
+            return context.IsRequestCompleted;
+        }
+
+        private async Task<AccessToken> ObtainAccessTokenAsync(string appKey, string appSecret, RequestToken token, string verifier)
+        {
+            string normalizedUrl;
+            string normalizedRequestParameters;
+
+            var oauthBase = new OAuthBase();
+            var url = new Uri(BaseUri + AccessTokenEndpoint);
+            var signature = oauthBase.GenerateSignature(
+                url,
+                appKey,
+                appSecret,
+                token.Token,
+                verifier,
+                "POST",
+                oauthBase.GenerateTimeStamp(),
+                oauthBase.GenerateNonce(),
+                "",
+                out normalizedUrl, out normalizedRequestParameters);
+
+            var postData = normalizedRequestParameters + "&oauth_signature=" + HttpUtility.UrlEncode(signature);
+            var authorizationParts = new SortedDictionary<string, string>();
+
+            foreach (var key in postData.Split('&'))
+            {
+                authorizationParts.Add(key.Split('=')[0], key.Split('=')[1]);
+            }
+
+            var authorizationHeaderBuilder = new StringBuilder();
+            authorizationHeaderBuilder.Append("OAuth ");
+            foreach (var authorizationPart in authorizationParts)
+            {
+                authorizationHeaderBuilder.AppendFormat(
+                    "{0}=\"{1}\", ", authorizationPart.Key, Uri.EscapeDataString(authorizationPart.Value));
+            }
+            authorizationHeaderBuilder.Length = authorizationHeaderBuilder.Length - 2;
+
+            string query = await WebRequestAsync(HttpMethod.Post, normalizedUrl, authorizationHeaderBuilder.ToString());
+
+            if (query.Length > 0)
+            {
+                var responseParameters = HttpUtility.ParseQueryString(query);
+                if (responseParameters["oauth_token"] != null)
+                {
+                    return new AccessToken
+                    {
+                        Token = Uri.UnescapeDataString(responseParameters["oauth_token"]),
+                        Shard = Uri.UnescapeDataString(responseParameters["edam_shard"]),
+                        UserId = Uri.UnescapeDataString(responseParameters["edam_userId"]),
+                        NoteStoreUrl = Uri.UnescapeDataString(responseParameters["edam_noteStoreUrl"]),
+                        WebApiUrlPrefix = Uri.UnescapeDataString(responseParameters["edam_webApiUrlPrefix"]),
+                    };
+                }
+            }
+
+            return new AccessToken();
+        }
+
+        private Task<string> WebRequestAsync(HttpMethod method, string url, string postData)
+        {
+            try
+            {
+                var request = new HttpRequestMessage(method, url);
+
+                if (method == HttpMethod.Post)
+                    request.Headers.Add("Authorization", postData);
+
+                _logger.WriteInformation("Send request...");
+
+                var response = _httpClient.SendAsync(request, Request.CallCancelled).Result;
+
+                _logger.WriteInformation("Request ended");
+
+                response.EnsureSuccessStatusCode();
+                return response.Content.ReadAsStringAsync();
+            }
+            catch (Exception ex)
+            {
+                _logger.WriteError(ex.Message, ex);
+            }
+
+            return null;
+        }
+    }
+}

src/Owin.Security.Providers.Evernote/EvernoteAuthenticationMiddleware.cs

@@ -0,0 +1,87 @@
+using System;
+using System.Globalization;
+using System.Net.Http;
+using Microsoft.Owin;
+using Microsoft.Owin.Logging;
+using Microsoft.Owin.Security;
+using Microsoft.Owin.Security.DataHandler;
+using Microsoft.Owin.Security.DataHandler.Encoder;
+using Microsoft.Owin.Security.DataProtection;
+using Microsoft.Owin.Security.Infrastructure;
+using Owin.Security.Providers.Evernote.Messages;
+
+namespace Owin.Security.Providers.Evernote
+{
+    public class EvernoteAuthenticationMiddleware : AuthenticationMiddleware<EvernoteAuthenticationOptions>
+    {
+        private readonly HttpClient _httpClient;
+        private readonly ILogger _logger;
+
+        public EvernoteAuthenticationMiddleware(OwinMiddleware next, IAppBuilder app,
+            EvernoteAuthenticationOptions options)
+            : base(next, options)
+        {
+            if (string.IsNullOrWhiteSpace(Options.AppKey))
+                throw new ArgumentException(string.Format(CultureInfo.CurrentCulture,
+                    Resources.Exception_OptionMustBeProvided, "AppKey"));
+            if (string.IsNullOrWhiteSpace(Options.AppSecret))
+                throw new ArgumentException(string.Format(CultureInfo.CurrentCulture,
+                    Resources.Exception_OptionMustBeProvided, "AppSecret"));
+
+            _logger = app.CreateLogger<EvernoteAuthenticationMiddleware>();
+
+            if (Options.Provider == null)
+                Options.Provider = new EvernoteAuthenticationProvider();
+
+            if (Options.StateDataFormat == null)
+            {
+                var dataProtector = app.CreateDataProtector(
+                    typeof (EvernoteAuthenticationMiddleware).FullName,
+                    Options.AuthenticationType, "v1");
+                Options.StateDataFormat = new SecureDataFormat<RequestToken>(
+                    Serializers.RequestToken,
+                    dataProtector,
+                    TextEncodings.Base64Url);
+            }
+
+            if (string.IsNullOrEmpty(Options.SignInAsAuthenticationType))
+                Options.SignInAsAuthenticationType = app.GetDefaultSignInAsAuthenticationType();
+
+            _httpClient = new HttpClient(ResolveHttpMessageHandler(Options))
+            {
+                Timeout = Options.BackchannelTimeout,
+                MaxResponseContentBufferSize = 1024*1024*10
+            };
+        }
+
+        /// <summary>
+        ///     Provides the <see cref="T:Microsoft.Owin.Security.Infrastructure.AuthenticationHandler" /> object for processing
+        ///     authentication-related requests.
+        /// </summary>
+        /// <returns>
+        ///     An <see cref="T:Microsoft.Owin.Security.Infrastructure.AuthenticationHandler" /> configured with the
+        ///     <see cref="T:Owin.Security.Providers.Evernote.EvernoteAuthenticationOptions" /> supplied to the constructor.
+        /// </returns>
+        protected override AuthenticationHandler<EvernoteAuthenticationOptions> CreateHandler()
+        {
+            return new EvernoteAuthenticationHandler(_httpClient, _logger);
+        }
+
+        private static HttpMessageHandler ResolveHttpMessageHandler(EvernoteAuthenticationOptions options)
+        {
+            var handler = options.BackchannelHttpHandler ?? new WebRequestHandler();
+
+            // If they provided a validator, apply it or fail.
+            if (options.BackchannelCertificateValidator == null) return handler;
+            // Set the cert validate callback
+            var webRequestHandler = handler as WebRequestHandler;
+            if (webRequestHandler == null)
+            {
+                throw new InvalidOperationException(Resources.Exception_ValidatorHandlerMismatch);
+            }
+            webRequestHandler.ServerCertificateValidationCallback = options.BackchannelCertificateValidator.Validate;
+
+            return handler;
+        }
+    }
+}

src/Owin.Security.Providers.Evernote/EvernoteAuthenticationOptions.cs

@@ -0,0 +1,98 @@
+using System;
+using System.Net.Http;
+using Microsoft.Owin;
+using Microsoft.Owin.Security;
+using Owin.Security.Providers.Evernote.Messages;
+
+namespace Owin.Security.Providers.Evernote
+{
+    public class EvernoteAuthenticationOptions : AuthenticationOptions
+    {
+        /// <summary>
+        ///     Gets or sets the a pinned certificate validator to use to validate the endpoints used
+        ///     in back channel communications belong to Evernote
+        /// </summary>
+        /// <value>
+        ///     The pinned certificate validator.
+        /// </value>
+        /// <remarks>
+        ///     If this property is null then the default certificate checks are performed,
+        ///     validating the subject name and if the signing chain is a trusted party.
+        /// </remarks>
+        public ICertificateValidator BackchannelCertificateValidator { get; set; }
+
+        /// <summary>
+        ///     The HttpMessageHandler used to communicate with Evernote.
+        ///     This cannot be set at the same time as BackchannelCertificateValidator unless the value
+        ///     can be downcast to a WebRequestHandler.
+        /// </summary>
+        public HttpMessageHandler BackchannelHttpHandler { get; set; }
+
+        /// <summary>
+        ///     Gets or sets timeout value in milliseconds for back channel communications with Evernote.
+        /// </summary>
+        /// <value>
+        ///     The back channel timeout in milliseconds.
+        /// </value>
+        public TimeSpan BackchannelTimeout { get; set; }
+
+        /// <summary>
+        ///     The request path within the application's base path where the user-agent will be returned.
+        ///     The middleware will process this request when it arrives.
+        ///     Default value is "/signin-Evernote".
+        /// </summary>
+        public PathString CallbackPath { get; set; }
+
+        /// <summary>
+        ///     Get or sets the text that the user can display on a sign in user interface.
+        /// </summary>
+        public string Caption
+        {
+            get { return Description.Caption; }
+            set { Description.Caption = value; }
+        }
+
+        /// <summary>
+        ///     Gets or sets the Evernote supplied Application Key
+        /// </summary>
+        public string AppKey { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the Evernote supplied Application Secret
+        /// </summary>
+        public string AppSecret { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the Evernote sandbox mode
+        /// </summary>
+        public bool IsSandBox { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the <see cref="IEvernoteAuthenticationProvider" /> used in the authentication events
+        /// </summary>
+        public IEvernoteAuthenticationProvider Provider { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the name of another authentication middleware which will be responsible for actually issuing a user
+        ///     <see cref="System.Security.Claims.ClaimsIdentity" />.
+        /// </summary>
+        public string SignInAsAuthenticationType { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the type used to secure data handled by the middleware.
+        /// </summary>
+        public ISecureDataFormat<RequestToken> StateDataFormat { get; set; }
+
+        /// <summary>
+        ///     Initializes a new <see cref="EvernoteAuthenticationOptions" />
+        /// </summary>
+        public EvernoteAuthenticationOptions()
+            : base("Evernote")
+        {
+            Caption = Constants.DefaultAuthenticationType;
+            CallbackPath = new PathString("/signin-evernote");
+            AuthenticationMode = AuthenticationMode.Passive;
+            BackchannelTimeout = TimeSpan.FromSeconds(60);
+        }
+    }
+}

src/Owin.Security.Providers.Evernote/Messages/AccessToken.cs

@@ -0,0 +1,26 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+namespace Owin.Security.Providers.Evernote.Messages
+{
+    /// <summary>
+    /// Evernote access token
+    /// </summary>
+    public class AccessToken : RequestToken
+    {
+        /// <summary>
+        /// Gets or sets the Evernote User ID
+        /// </summary>
+        public string UserId { get; set; }
+
+        /// <summary>
+        /// Gets or sets the Evernote User Name
+        /// </summary>
+        public string UserName { get; set; }
+
+        public string Shard { get; set; }
+
+        public string NoteStoreUrl { get; set; }
+
+        public string WebApiUrlPrefix { get; set; }
+    }
+}

src/Owin.Security.Providers.Evernote/Messages/RequestToken.cs

@@ -0,0 +1,24 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+using Microsoft.Owin.Security;
+
+namespace Owin.Security.Providers.Evernote.Messages
+{
+    /// <summary>
+    /// Yahoo request token
+    /// </summary>
+    public class RequestToken
+    {
+        /// <summary>
+        /// Gets or sets the Yahoo token
+        /// </summary>
+        public string Token { get; set; }
+
+        public bool CallbackConfirmed { get; set; }
+
+        /// <summary>
+        /// Gets or sets a property bag for common authentication properties
+        /// </summary>
+        public AuthenticationProperties Properties { get; set; }
+    }
+}

src/Owin.Security.Providers.Evernote/Messages/RequestTokenSerializer.cs

@@ -0,0 +1,103 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+using System;
+using System.Diagnostics.CodeAnalysis;
+using System.IO;
+using Microsoft.Owin.Security.DataHandler.Serializer;
+
+namespace Owin.Security.Providers.Evernote.Messages
+{
+    /// <summary>
+    /// Serializes and deserializes Yahoo request and access tokens so that they can be used by other application components.
+    /// </summary>
+    public class RequestTokenSerializer : IDataSerializer<RequestToken>
+    {
+        private const int FormatVersion = 1;
+
+        /// <summary>
+        /// Serialize a request token
+        /// </summary>
+        /// <param name="model">The token to serialize</param>
+        /// <returns>A byte array containing the serialized token</returns>
+        [SuppressMessage("Microsoft.Usage", "CA2202:Do not dispose objects multiple times", Justification = "Dispose is idempotent")]
+        public virtual byte[] Serialize(RequestToken model)
+        {
+            using (var memory = new MemoryStream())
+            {
+                using (var writer = new BinaryWriter(memory))
+                {
+                    Write(writer, model);
+                    writer.Flush();
+                    return memory.ToArray();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Deserializes a request token
+        /// </summary>
+        /// <param name="data">A byte array containing the serialized token</param>
+        /// <returns>The Yahoo request token</returns>
+        [SuppressMessage("Microsoft.Usage", "CA2202:Do not dispose objects multiple times", Justification = "Dispose is idempotent")]
+        public virtual RequestToken Deserialize(byte[] data)
+        {
+            using (var memory = new MemoryStream(data))
+            {
+                using (var reader = new BinaryReader(memory))
+                {
+                    return Read(reader);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Writes a Yahoo request token as a series of bytes. Used by the <see cref="Serialize"/> method.
+        /// </summary>
+        /// <param name="writer">The writer to use in writing the token</param>
+        /// <param name="token">The token to write</param>
+        public static void Write(BinaryWriter writer, RequestToken token)
+        {
+            if (writer == null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+            if (token == null)
+            {
+                throw new ArgumentNullException(nameof(token));
+            }
+
+            writer.Write(FormatVersion);
+            writer.Write(token.Token);
+            writer.Write(token.CallbackConfirmed);
+            PropertiesSerializer.Write(writer, token.Properties);
+        }
+
+        /// <summary>
+        /// Reads a Yahoo request token from a series of bytes. Used by the <see cref="Deserialize"/> method.
+        /// </summary>
+        /// <param name="reader">The reader to use in reading the token bytes</param>
+        /// <returns>The token</returns>
+        public static RequestToken Read(BinaryReader reader)
+        {
+            if (reader == null)
+            {
+                throw new ArgumentNullException(nameof(reader));
+            }
+
+            if (reader.ReadInt32() != FormatVersion)
+            {
+                return null;
+            }
+
+            var token = reader.ReadString();
+            var callbackConfirmed = reader.ReadBoolean();
+            var properties = PropertiesSerializer.Read(reader);
+            if (properties == null)
+            {
+                return null;
+            }
+
+            return new RequestToken { Token = token, CallbackConfirmed = callbackConfirmed, Properties = properties };
+        }
+    }
+}

src/Owin.Security.Providers.Evernote/Messages/Serializers.cs

@@ -0,0 +1,22 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+using Microsoft.Owin.Security.DataHandler.Serializer;
+
+namespace Owin.Security.Providers.Evernote.Messages
+{
+    /// <summary>
+    /// Provides access to a request token serializer
+    /// </summary>
+    public static class Serializers
+    {
+        static Serializers()
+        {
+            RequestToken = new RequestTokenSerializer();
+        }
+
+        /// <summary>
+        /// Gets or sets a statically-avaliable serializer object. The value for this property will be <see cref="RequestTokenSerializer"/> by default.
+        /// </summary>
+        public static IDataSerializer<RequestToken> RequestToken { get; set; }
+    }
+}

src/Owin.Security.Providers.Evernote/OAuthBase.cs

@@ -0,0 +1,177 @@
+using System;
+using System.Collections.Generic;
+using System.Security.Cryptography;
+using System.Text;
+using System.Web;
+
+namespace Owin.Security.Providers.Evernote
+{
+    internal sealed class OAuthBase
+    {
+        private readonly Random _random = new Random();
+        private readonly string _unreservedChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.~";
+        private const string OAuthConsumerKey = "oauth_consumer_key";
+        private const string OAuthCallbackKey = "oauth_callback";
+        private const string OAuthSignatureMethodKey = "oauth_signature_method";
+        private const string OAuthTimestampKey = "oauth_timestamp";
+        private const string OAuthNonceKey = "oauth_nonce";
+        private const string OAuthTokenKey = "oauth_token";
+        private const string OAuthVerifierKey = "oauth_verifier";
+        private const string Hmacsha1SignatureType = "HMAC-SHA1";
+        private const string PlainTextSignatureType = "PLAINTEXT";
+
+        private string ComputeHash(HashAlgorithm hashAlgorithm, string data)
+        {
+            if (hashAlgorithm == null)
+                throw new ArgumentNullException("hashAlgorithm");
+            if (string.IsNullOrEmpty(data))
+                throw new ArgumentNullException("data");
+            byte[] bytes = Encoding.ASCII.GetBytes(data);
+            return Convert.ToBase64String(hashAlgorithm.ComputeHash(bytes));
+        }
+
+        private List<QueryParameter> GetQueryParameters(string parameters)
+        {
+            if (parameters.StartsWith("?"))
+                parameters = parameters.Remove(0, 1);
+            List<QueryParameter> queryParameterList = new List<QueryParameter>();
+            if (!string.IsNullOrEmpty(parameters))
+            {
+                string str = parameters;
+                char[] chArray = { '&' };
+                foreach (string name in str.Split(chArray))
+                {
+                    if (!string.IsNullOrEmpty(name) && !name.StartsWith("oauth_"))
+                    {
+                        if (name.IndexOf('=') > -1)
+                        {
+                            string[] strArray = name.Split('=');
+                            queryParameterList.Add(new QueryParameter(strArray[0], strArray[1]));
+                        }
+                        else
+                            queryParameterList.Add(new QueryParameter(name, string.Empty));
+                    }
+                }
+            }
+            return queryParameterList;
+        }
+
+        private string UrlEncode(string value)
+        {
+            var stringBuilder = new StringBuilder();
+            foreach (char ch in value)
+            {
+                if (_unreservedChars.IndexOf(ch) != -1)
+                    stringBuilder.Append(ch);
+                else
+                    stringBuilder.Append(37 + $"{(int) ch:X2}");
+            }
+            return stringBuilder.ToString();
+        }
+
+        private string NormalizeRequestParameters(IList<QueryParameter> parameters)
+        {
+            StringBuilder stringBuilder = new StringBuilder();
+            for (int index = 0; index < parameters.Count; ++index)
+            {
+                QueryParameter queryParameter = parameters[index];
+                stringBuilder.AppendFormat("{0}={1}", queryParameter.Name, queryParameter.Value);
+                if (index < parameters.Count - 1)
+                    stringBuilder.Append("&");
+            }
+            return stringBuilder.ToString();
+        }
+
+        private string GenerateSignatureBase(Uri url, string consumerKey, string token, string verifier, string httpMethod, string timeStamp, string nonce, string callback, string signatureType, out string normalizedUrl, out string normalizedRequestParameters)
+        {
+            if (token == null)
+                token = string.Empty;
+            if (string.IsNullOrEmpty(consumerKey))
+                throw new ArgumentNullException("consumerKey");
+            if (string.IsNullOrEmpty(httpMethod))
+                throw new ArgumentNullException("httpMethod");
+            if (string.IsNullOrEmpty(signatureType))
+                throw new ArgumentNullException("signatureType");
+
+            List<QueryParameter> queryParameters = GetQueryParameters(url.Query);
+            queryParameters.Add(new QueryParameter(OAuthConsumerKey, consumerKey));
+            queryParameters.Add(new QueryParameter(OAuthSignatureMethodKey, signatureType));
+            queryParameters.Add(new QueryParameter(OAuthTimestampKey, timeStamp));
+            queryParameters.Add(new QueryParameter(OAuthNonceKey, nonce));
+
+            if (!string.IsNullOrEmpty(callback))
+                queryParameters.Add(new QueryParameter(OAuthCallbackKey, callback));
+            if (!string.IsNullOrEmpty(token))
+                queryParameters.Add(new QueryParameter(OAuthTokenKey, token));
+            if (!string.IsNullOrEmpty(verifier))
+                queryParameters.Add(new QueryParameter(OAuthVerifierKey, verifier));
+
+            normalizedUrl = $"{url.Scheme}://{url.Host}";
+            normalizedUrl += url.AbsolutePath;
+            normalizedRequestParameters = NormalizeRequestParameters(queryParameters);
+
+            StringBuilder stringBuilder = new StringBuilder();
+            stringBuilder.AppendFormat("{0}&", httpMethod.ToUpperInvariant());
+            stringBuilder.AppendFormat("{0}&", UrlEncode(normalizedUrl));
+            stringBuilder.AppendFormat("{0}", UrlEncode(normalizedRequestParameters));
+
+            return stringBuilder.ToString();
+        }
+
+        private string GenerateSignatureUsingHash(string signatureBase, HashAlgorithm hash)
+        {
+            return ComputeHash(hash, signatureBase);
+        }
+
+        public string GenerateSignature(Uri url, string consumerKey, string consumerSecret, string token, string verifier, string httpMethod, string timeStamp, string nonce, string callback, out string normalizedUrl, out string normalizedRequestParameters)
+        {
+            return GenerateSignature(url, consumerKey, consumerSecret, token, verifier, httpMethod, timeStamp, nonce, callback, SignatureTypes.Plaintext, out normalizedUrl, out normalizedRequestParameters);
+        }
+
+        public string GenerateSignature(Uri url, string consumerKey, string consumerSecret, string token, string verifier, string httpMethod, string timeStamp, string nonce, string callback, SignatureTypes signatureType, out string normalizedUrl, out string normalizedRequestParameters)
+        {
+            normalizedUrl = null;
+            normalizedRequestParameters = null;
+            switch (signatureType)
+            {
+                case SignatureTypes.Hmacsha1:
+                    var signatureBase = GenerateSignatureBase(url, consumerKey, token, verifier, httpMethod, timeStamp, nonce, callback, Hmacsha1SignatureType, out normalizedUrl, out normalizedRequestParameters);
+                    var hmacshA1 = new HMACSHA1
+                    {
+                        Key = Encoding.ASCII.GetBytes($"{UrlEncode(consumerSecret)}&{UrlEncode(verifier)}")
+                    };
+                    return GenerateSignatureUsingHash(signatureBase, hmacshA1);
+                case SignatureTypes.Plaintext:
+                    GenerateSignatureBase(url, consumerKey, token, verifier, httpMethod, timeStamp, nonce, callback, PlainTextSignatureType, out normalizedUrl, out normalizedRequestParameters);
+                    return HttpUtility.UrlEncode($"{consumerSecret}&{verifier}");
+                case SignatureTypes.Rsasha1:
+                    throw new NotImplementedException();
+                default:
+                    throw new ArgumentException(@"Unknown signature type", nameof(signatureType));
+            }
+        }
+
+        public string GenerateTimeStamp()
+        {
+            return Convert.ToInt64((DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0)).TotalSeconds).ToString();
+        }
+
+        public string GenerateNonce()
+        {
+            return _random.Next(123400, 9999999).ToString();
+        }
+
+        private class QueryParameter
+        {
+            public string Name { get; }
+
+            public string Value { get; }
+
+            public QueryParameter(string name, string value)
+            {
+                Name = name;
+                Value = value;
+            }
+        }
+    }
+}

src/Owin.Security.Providers.Evernote/Owin.Security.Providers.Evernote.csproj

@@ -0,0 +1,136 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{B8F05057-8B9F-44CE-B983-99CB7C2E9E5A}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Owin.Security.Providers.Evernote</RootNamespace>
+    <AssemblyName>Owin.Security.Providers.Evernote</AssemblyName>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <TargetFrameworkProfile />
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Accessibility" />
+    <Reference Include="CsQuery, Version=1.3.3.249, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\CsQuery.1.3.4\lib\net40\CsQuery.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="en-html2enml, Version=0.0.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\evernote-cloud-sdk-windows.1.0.8\lib\net40\en-html2enml.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Evernote, Version=1.0.5377.16918, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\evernote-cloud-sdk-windows.1.0.8\lib\net40\Evernote.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="EvernoteOAuthNet, Version=2.1.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\evernote-cloud-sdk-windows.1.0.8\lib\net40\EvernoteOAuthNet.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="EvernoteSDK, Version=1.0.12.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\evernote-cloud-sdk-windows.1.0.8\lib\net40\EvernoteSDK.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Microsoft.Owin.3.0.1\lib\net45\Microsoft.Owin.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Microsoft.Owin.Security, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Microsoft.Owin.Security.3.0.1\lib\net45\Microsoft.Owin.Security.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Newtonsoft.Json, Version=9.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Newtonsoft.Json.9.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Owin, Version=1.0.0.0, Culture=neutral, PublicKeyToken=f0ebd12fd5e55cc5, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Owin.1.0\lib\net40\Owin.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="PreMailer.Net, Version=1.2.7.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\PreMailer.Net.1.2.7\lib\net40\PreMailer.Net.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="SgmlReaderDll, Version=1.8.11.0, Culture=neutral, PublicKeyToken=46b2db9ca481831b, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\SgmlReader.1.8.11\lib\4.0\SgmlReaderDll.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Net.Http.WebRequest" />
+    <Reference Include="System.Web" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+    <Reference Include="Thrift, Version=0.8.0.16918, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\evernote-cloud-sdk-windows.1.0.8\lib\net40\Thrift.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Constants.cs" />
+    <Compile Include="EvernoteAuthenticationExtensions.cs" />
+    <Compile Include="EvernoteAuthenticationHandler.cs" />
+    <Compile Include="EvernoteAuthenticationMiddleware.cs" />
+    <Compile Include="EvernoteAuthenticationOptions.cs" />
+    <Compile Include="Messages\AccessToken.cs" />
+    <Compile Include="Messages\RequestToken.cs" />
+    <Compile Include="Messages\RequestTokenSerializer.cs" />
+    <Compile Include="Messages\Serializers.cs" />
+    <Compile Include="OAuthBase.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Provider\EvernoteAuthenticatedContext.cs" />
+    <Compile Include="Provider\EvernoteAuthenticationProvider.cs" />
+    <Compile Include="Provider\EvernoteReturnEndpointContext.cs" />
+    <Compile Include="Provider\IEvernoteAuthenticationProvider.cs" />
+    <Compile Include="Resources.Designer.cs">
+      <DependentUpon>Resources.resx</DependentUpon>
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+    </Compile>
+    <Compile Include="SignatureTypes.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+    </EmbeddedResource>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

src/Owin.Security.Providers.Evernote/Properties/AssemblyInfo.cs

@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Owin.Security.Providers.Evernote")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Owin.Security.Providers.Evernote")]
+[assembly: AssemblyCopyright("Copyright ©  2016")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("b8f05057-8b9f-44ce-b983-99cb7c2e9e5a")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

src/Owin.Security.Providers.Evernote/Provider/EvernoteAuthenticatedContext.cs

@@ -0,0 +1,57 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+using System.Security.Claims;
+using Microsoft.Owin;
+using Microsoft.Owin.Security;
+using Microsoft.Owin.Security.Provider;
+using Owin.Security.Providers.Evernote.Messages;
+
+namespace Owin.Security.Providers.Evernote
+{
+    /// <summary>
+    /// Contains information about the login session as well as the user <see cref="System.Security.Claims.ClaimsIdentity"/>.
+    /// </summary>
+    public class EvernoteAuthenticatedContext : BaseContext
+    {
+        /// <summary>
+        /// Initializes a <see cref="EvernoteAuthenticatedContext"/>
+        /// </summary>
+        /// <param name="context">The OWIN environment</param>
+        /// <param name="accessToken">Evernote access toke</param>
+        public EvernoteAuthenticatedContext(IOwinContext context, AccessToken accessToken)
+            : base(context)
+        {
+            UserId = accessToken.UserId;
+            UserName = accessToken.UserName;
+            AccessToken = accessToken.Token;
+            NoteStoreUrl = accessToken.NoteStoreUrl;
+        }
+
+        /// <summary>
+        /// Gets the Evernote user ID
+        /// </summary>
+        public string UserId { get; private set; }
+
+        /// <summary>
+        /// Gets the Evernote username
+        /// </summary>
+        public string UserName { get; set; }
+
+        /// <summary>
+        /// Gets the Evernote access token
+        /// </summary>
+        public string AccessToken { get; private set; }
+
+        public string NoteStoreUrl { get; set; }
+
+        /// <summary>
+        /// Gets the <see cref="ClaimsIdentity"/> representing the user
+        /// </summary>
+        public ClaimsIdentity Identity { get; set; }
+
+        /// <summary>
+        /// Gets or sets a property bag for common authentication properties
+        /// </summary>
+        public AuthenticationProperties Properties { get; set; }
+    }
+}

src/Owin.Security.Providers.Evernote/Provider/EvernoteAuthenticationProvider.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Threading.Tasks;
+
+namespace Owin.Security.Providers.Evernote
+{
+    /// <summary>
+    /// Default <see cref="IEvernoteAuthenticationProvider"/> implementation.
+    /// </summary>
+    public class EvernoteAuthenticationProvider : IEvernoteAuthenticationProvider
+    {
+        /// <summary>
+        /// Initializes a <see cref="EvernoteAuthenticationProvider"/>
+        /// </summary>
+        public EvernoteAuthenticationProvider()
+        {
+            OnAuthenticated = context => Task.FromResult<object>(null);
+            OnReturnEndpoint = context => Task.FromResult<object>(null);
+        }
+
+        /// <summary>
+        /// Gets or sets the function that is invoked when the Authenticated method is invoked.
+        /// </summary>
+        public Func<EvernoteAuthenticatedContext, Task> OnAuthenticated { get; set; }
+
+        /// <summary>
+        /// Gets or sets the function that is invoked when the ReturnEndpoint method is invoked.
+        /// </summary>
+        public Func<EvernoteReturnEndpointContext, Task> OnReturnEndpoint { get; set; }
+
+        /// <summary>
+        /// Invoked whenever Evernote successfully authenticates a user
+        /// </summary>
+        /// <param name="context">Contains information about the login session as well as the user <see cref="System.Security.Claims.ClaimsIdentity"/>.</param>
+        /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
+        public virtual Task Authenticated(EvernoteAuthenticatedContext context)
+        {
+            return OnAuthenticated(context);
+        }
+
+        /// <summary>
+        /// Invoked prior to the <see cref="System.Security.Claims.ClaimsIdentity"/> being saved in a local cookie and the browser being redirected to the originally requested URL.
+        /// </summary>
+        /// <param name="context"></param>
+        /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
+        public virtual Task ReturnEndpoint(EvernoteReturnEndpointContext context)
+        {
+            return OnReturnEndpoint(context);
+        }
+    }
+}

src/Owin.Security.Providers.Evernote/Provider/EvernoteReturnEndpointContext.cs

@@ -0,0 +1,26 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+using Microsoft.Owin;
+using Microsoft.Owin.Security;
+using Microsoft.Owin.Security.Provider;
+
+namespace Owin.Security.Providers.Evernote
+{
+    /// <summary>
+    /// Provides context information to middleware providers.
+    /// </summary>
+    public class EvernoteReturnEndpointContext : ReturnEndpointContext
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="context">OWIN environment</param>
+        /// <param name="ticket">The authentication ticket</param>
+        public EvernoteReturnEndpointContext(
+            IOwinContext context,
+            AuthenticationTicket ticket)
+            : base(context, ticket)
+        {
+        }
+    }
+}

src/Owin.Security.Providers.Evernote/Provider/IEvernoteAuthenticationProvider.cs

@@ -0,0 +1,24 @@
+using System.Threading.Tasks;
+
+namespace Owin.Security.Providers.Evernote
+{
+    /// <summary>
+    /// Specifies callback methods which the <see cref="EvernoteAuthenticationMiddleware"></see> invokes to enable developer control over the authentication process. />
+    /// </summary>
+    public interface IEvernoteAuthenticationProvider
+    {
+        /// <summary>
+        /// Invoked whenever Evernote successfully authenticates a user
+        /// </summary>
+        /// <param name="context">Contains information about the login session as well as the user <see cref="System.Security.Claims.ClaimsIdentity"/>.</param>
+        /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
+        Task Authenticated(EvernoteAuthenticatedContext context);
+
+        /// <summary>
+        /// Invoked prior to the <see cref="System.Security.Claims.ClaimsIdentity"/> being saved in a local cookie and the browser being redirected to the originally requested URL.
+        /// </summary>
+        /// <param name="context"></param>
+        /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
+        Task ReturnEndpoint(EvernoteReturnEndpointContext context);
+    }
+}

src/Owin.Security.Providers.Evernote/Resources.Designer.cs

@@ -0,0 +1,81 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace Owin.Security.Providers.Evernote {
+    using System;
+    
+    
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "4.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Resources {
+        
+        private static global::System.Resources.ResourceManager resourceMan;
+        
+        private static global::System.Globalization.CultureInfo resourceCulture;
+        
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Resources() {
+        }
+        
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager {
+            get {
+                if (object.ReferenceEquals(resourceMan, null)) {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("Owin.Security.Providers.Evernote.Resources", typeof(Resources).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to The &apos;{0}&apos; option must be provided..
+        /// </summary>
+        internal static string Exception_OptionMustBeProvided {
+            get {
+                return ResourceManager.GetString("Exception_OptionMustBeProvided", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to An ICertificateValidator cannot be specified at the same time as an HttpMessageHandler unless it is a WebRequestHandler..
+        /// </summary>
+        internal static string Exception_ValidatorHandlerMismatch {
+            get {
+                return ResourceManager.GetString("Exception_ValidatorHandlerMismatch", resourceCulture);
+            }
+        }
+    }
+}

src/Owin.Security.Providers.Evernote/Resources.resx

@@ -0,0 +1,126 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="Exception_OptionMustBeProvided" xml:space="preserve">
+    <value>The '{0}' option must be provided.</value>
+  </data>
+  <data name="Exception_ValidatorHandlerMismatch" xml:space="preserve">
+    <value>An ICertificateValidator cannot be specified at the same time as an HttpMessageHandler unless it is a WebRequestHandler.</value>
+  </data>
+</root>

src/Owin.Security.Providers.Evernote/SignatureTypes.cs

@@ -0,0 +1,9 @@
+namespace Owin.Security.Providers.Evernote
+{
+    public enum SignatureTypes
+    {
+        Hmacsha1,
+        Plaintext,
+        Rsasha1
+    }
+}

src/Owin.Security.Providers.Evernote/packages.config

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="CsQuery" version="1.3.4" targetFramework="net45" />
+  <package id="evernote-cloud-sdk-windows" version="1.0.8" targetFramework="net45" />
+  <package id="Microsoft.Owin" version="3.0.1" targetFramework="net452" />
+  <package id="Microsoft.Owin.Security" version="3.0.1" targetFramework="net452" />
+  <package id="Newtonsoft.Json" version="9.0.1" targetFramework="net452" />
+  <package id="Owin" version="1.0" targetFramework="net452" />
+  <package id="PreMailer.Net" version="1.2.7" targetFramework="net45" />
+  <package id="SgmlReader" version="1.8.11" targetFramework="net45" />
+</packages>

src/Owin.Security.Providers.Fitbit/Owin.Security.Providers.Fitbit.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.Flickr/Owin.Security.Providers.Flickr.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.Foursquare/Owin.Security.Providers.Foursquare.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.Geni/Owin.Security.Providers.Geni.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.GitHub/Owin.Security.Providers.GitHub.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.Gitter/Owin.Security.Providers.Gitter.csproj

@@ -20,6 +20,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -28,6 +29,7 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Microsoft.Owin, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">

src/Owin.Security.Providers.Google/Constants.cs

@@ -0,0 +1,7 @@
+namespace Owin.Security.Providers.Google
+{
+    internal static class Constants
+    {
+        public const string DefaultAuthenticationType = "Google";
+    }
+}