From 44d2c4db2cc8b6547d920dbd77f4b016e3a93e0b Mon Sep 17 00:00:00 2001
From: Tommy Parnell <tparnell8@gmail.com>
Date: Tue, 21 Apr 2015 20:17:51 -0400
Subject: [PATCH 1/2] add some auth helpers

---
 .../Authentication/AuthenticationHelper.cs    | 42 +++++++++++++++++++
 src/Untappd.Net/Constants.cs                  |  1 +
 src/Untappd.Net/Untappd.Net.csproj            |  1 +
 3 files changed, 44 insertions(+)
 create mode 100644 src/Untappd.Net/Authentication/AuthenticationHelper.cs

diff --git a/src/Untappd.Net/Authentication/AuthenticationHelper.cs b/src/Untappd.Net/Authentication/AuthenticationHelper.cs
new file mode 100644
index 0000000..7ce21e8
--- /dev/null
+++ b/src/Untappd.Net/Authentication/AuthenticationHelper.cs
@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Untappd.Net.Client;
+using Untappd.Net.Request;
+
+namespace Untappd.Net.Authentication
+{
+    public static class AuthenticationHelper
+    {
+        /// <summary>
+        /// Redirect the user to this string.
+        /// </summary>
+        /// <param name="credentials"></param>
+        /// <param name="redirectUrl">The URL to redirect back to your application. Should listen on code as a string param</param>
+        /// <returns></returns>
+        public static string RedirectUserTo(IUnAuthenticadedUntappdCredentials credentials, string redirectUrl)
+        {
+            return string.Format("{0}/?client_id={1}&response_type=code&redirect_url={2}", Constants.BaseRequestString,
+                credentials.ClientId, redirectUrl);
+        }
+
+        /// <summary>
+        /// Url to get the OAuth token.
+        /// </summary>
+        /// <param name="credentials"></param>
+        /// <param name="redirectUrl"></param>
+        /// <param name="code">Data returned by the initial request(see: RedirectUserTo)</param>
+        /// <returns></returns>
+        public static string TokenUrl(IUnAuthenticadedUntappdCredentials credentials, string redirectUrl, string code)
+        {
+            return string.Format("{0}/?client_id={1}&client_secret={2}&response_type=code&redirect_url={3}&code={4}", 
+                Constants.OAuthTokenEndPoint, 
+                credentials.ClientId, 
+                credentials.ClientSecret,
+                redirectUrl, 
+                code);
+        }
+    }
+}
diff --git a/src/Untappd.Net/Constants.cs b/src/Untappd.Net/Constants.cs
index 058817f..1c72c24 100644
--- a/src/Untappd.Net/Constants.cs
+++ b/src/Untappd.Net/Constants.cs
@@ -3,5 +3,6 @@
     public struct Constants
     {
         public const string BaseRequestString = "https://api.untappd.com";
+        public const string OAuthTokenEndPoint = "https://untappd.com/oauth/authorize";
     }
 }
diff --git a/src/Untappd.Net/Untappd.Net.csproj b/src/Untappd.Net/Untappd.Net.csproj
index bf3d012..e805d63 100644
--- a/src/Untappd.Net/Untappd.Net.csproj
+++ b/src/Untappd.Net/Untappd.Net.csproj
@@ -46,6 +46,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Authentication\AuthenticationHelper.cs" />
     <Compile Include="Client\AuthenticatedUntappdCredentials.cs" />
     <Compile Include="Client\IAuthenticatedUntappdCredentials.cs" />
     <Compile Include="Client\IUnAuthenticadedUntappdCredentials.cs" />

From f63579884e5ea5ea8baf7bc6bfed456addcb3fe8 Mon Sep 17 00:00:00 2001
From: Tommy Parnell <tparnell8@gmail.com>
Date: Tue, 21 Apr 2015 20:29:33 -0400
Subject: [PATCH 2/2] add some argumentnull and exception handling

---
 .../TestAuthenticationHelper.cs               | 51 +++++++++++++++++++
 .../Untappd.Net.UnitTests.csproj              |  1 +
 .../Authentication/AuthenticationHelper.cs    | 23 +++++++++
 3 files changed, 75 insertions(+)
 create mode 100644 src/Untappd.Net.UnitTests/Authentication/TestAuthenticationHelper.cs

diff --git a/src/Untappd.Net.UnitTests/Authentication/TestAuthenticationHelper.cs b/src/Untappd.Net.UnitTests/Authentication/TestAuthenticationHelper.cs
new file mode 100644
index 0000000..4d2d1b5
--- /dev/null
+++ b/src/Untappd.Net.UnitTests/Authentication/TestAuthenticationHelper.cs
@@ -0,0 +1,51 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using NUnit.Framework;
+using Untappd.Net.Authentication;
+using Untappd.Net.Client;
+
+namespace Untappd.Net.UnitTests.Authentication
+{
+    [TestFixture]
+    public class TestAuthenticationHelper
+    {
+        [Test]
+        [ExpectedException(typeof(ArgumentNullException))]
+        public void TestRedirectUserToException1()
+        {
+
+            AuthenticationHelper.RedirectUserTo(null, "url");
+        }
+        [Test]
+        [ExpectedException(typeof(ArgumentNullException))]
+        public void TestRedirectUserToException2()
+        {
+
+            AuthenticationHelper.RedirectUserTo(new UnAuthenticatedUntappdCredentials("d", "d"), string.Empty);
+        }
+        [Test]
+        [ExpectedException(typeof(ArgumentNullException))]
+        public void TestTokenUrlException1()
+        {
+
+            AuthenticationHelper.TokenUrl(null, "some", "code");
+        }
+        [Test]
+        [ExpectedException(typeof(ArgumentNullException))]
+        public void TestTokenUrlException2()
+        {
+
+            AuthenticationHelper.TokenUrl(new UnAuthenticatedUntappdCredentials("d", "d"), string.Empty, "code");
+        }
+        [Test]
+        [ExpectedException(typeof(ArgumentNullException))]
+        public void TestTokenUrlException3()
+        {
+
+            AuthenticationHelper.TokenUrl(new UnAuthenticatedUntappdCredentials("d", "d"),  "ds", string.Empty);
+        }
+    }
+}
diff --git a/src/Untappd.Net.UnitTests/Untappd.Net.UnitTests.csproj b/src/Untappd.Net.UnitTests/Untappd.Net.UnitTests.csproj
index 0986b69..9530b32 100644
--- a/src/Untappd.Net.UnitTests/Untappd.Net.UnitTests.csproj
+++ b/src/Untappd.Net.UnitTests/Untappd.Net.UnitTests.csproj
@@ -69,6 +69,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Authentication\TestAuthenticationHelper.cs" />
     <Compile Include="Class1.cs" />
     <Compile Include="Client\TestAuthenticatedUntappdCredentials.cs" />
     <Compile Include="Client\TestUnAuthenticatedUntappdCredentials.cs" />
diff --git a/src/Untappd.Net/Authentication/AuthenticationHelper.cs b/src/Untappd.Net/Authentication/AuthenticationHelper.cs
index 7ce21e8..f7b59f3 100644
--- a/src/Untappd.Net/Authentication/AuthenticationHelper.cs
+++ b/src/Untappd.Net/Authentication/AuthenticationHelper.cs
@@ -18,6 +18,16 @@ namespace Untappd.Net.Authentication
         /// <returns></returns>
         public static string RedirectUserTo(IUnAuthenticadedUntappdCredentials credentials, string redirectUrl)
         {
+            if (credentials == null)
+            {
+                throw new ArgumentNullException("credentials");
+            }
+
+            if (string.IsNullOrWhiteSpace(redirectUrl))
+            {
+                throw new ArgumentNullException("redirectUrl");
+            }
+           
             return string.Format("{0}/?client_id={1}&response_type=code&redirect_url={2}", Constants.BaseRequestString,
                 credentials.ClientId, redirectUrl);
         }
@@ -31,6 +41,19 @@ namespace Untappd.Net.Authentication
         /// <returns></returns>
         public static string TokenUrl(IUnAuthenticadedUntappdCredentials credentials, string redirectUrl, string code)
         {
+            if (credentials == null)
+            {
+                throw new ArgumentNullException("credentials");
+            }
+
+            if (string.IsNullOrWhiteSpace(redirectUrl))
+            {
+                throw new ArgumentNullException("redirectUrl");
+            }
+            if (string.IsNullOrWhiteSpace(code))
+            {
+                throw new ArgumentNullException("code");
+            }
             return string.Format("{0}/?client_id={1}&client_secret={2}&response_type=code&redirect_url={3}&code={4}", 
                 Constants.OAuthTokenEndPoint, 
                 credentials.ClientId,