inline styles

src/TerribleDev.Blog.Web/Taghelpers/InlineCss.cs

@@ -0,0 +1,72 @@
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Razor.TagHelpers;
+using Microsoft.Extensions.Caching.Memory;
+using Microsoft.Extensions.FileProviders;
+using System.IO;
+using System.Threading.Tasks;
+
+namespace TerribleDev.Blog.Web.Taghelpers
+{
+    [HtmlTargetElement("inline-style")]
+    public class InlineStyleTagHelper : TagHelper
+    {
+        [HtmlAttributeName("href")]
+        public string Href { get; set; }
+
+        private IHostingEnvironment HostingEnvironment { get; }
+        private IMemoryCache Cache { get; }
+
+ 
+
+        public InlineStyleTagHelper(IHostingEnvironment hostingEnvironment, IMemoryCache cache)
+        {
+            HostingEnvironment = hostingEnvironment;
+            Cache = cache;
+        }
+
+ 
+        public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
+        {
+            var path = Href;
+
+            // Get the value from the cache, or compute the value and add it to the cache
+            var fileContent = await Cache.GetOrCreateAsync("InlineStyleTagHelper-" + path, async entry =>
+            {
+                var fileProvider = HostingEnvironment.WebRootFileProvider;
+                if(HostingEnvironment.IsDevelopment())
+                {
+                    var changeToken = fileProvider.Watch(path);
+                    entry.AddExpirationToken(changeToken);
+                }
+
+                entry.SetPriority(CacheItemPriority.NeverRemove);
+
+                var file = fileProvider.GetFileInfo(path);
+                if (file == null || !file.Exists)
+                    return null;
+
+                return await ReadFileContent(file);
+            });
+
+            if (fileContent == null)
+            {
+                output.SuppressOutput();
+                return;
+            }
+
+            output.TagName = "style";
+            output.Attributes.RemoveAll("href");
+            output.Content.AppendHtml(fileContent);
+        }
+
+        private static async Task<string> ReadFileContent(IFileInfo file)
+        {
+            using (var stream = file.CreateReadStream())
+            using (var textReader = new StreamReader(stream))
+            {
+                return await textReader.ReadToEndAsync();
+            }
+        }
+    }
+}

src/TerribleDev.Blog.Web/Views/Shared/_Layout.cshtml

@@ -15,10 +15,10 @@
     <link asp-append-version="true" rel="icon" async href="~/favicon.ico" />
     <title>@ViewData["Title"] - @config.Title</title>
     <environment names="Development">
-        <link asp-append-version="true" rel="stylesheet" href="~/css/site.css" />
+        <inline-style href="css/site.css"></inline-style>
     </environment>
     <environment names="Production">
-        <link asp-append-version="true" rel="stylesheet" href="~/css/site.min.css" />
+        <inline-style href="css/site.min.css"></inline-style>
     </environment>
     @RenderSection("Head", false)
 </head>