fix: add extension method for getting base url that checks for proxy headers

src/Blog/Components/Utils/OpenGraph.razor

@@ -34,7 +34,7 @@
       return;
     }
 
-    BaseUrl = $"{HttpContextAccessor.HttpContext.Request.Scheme}://{HttpContextAccessor.HttpContext.Request.Host}";
+    BaseUrl = HttpContextAccessor.HttpContext.Request.GetBaseUrl();
     OpenGraphUrl = $"{BaseUrl}{HttpContextAccessor.HttpContext.Request.Path}";
   }
-}
+}

src/Blog/Components/_Imports.razor

@@ -7,5 +7,6 @@
 @using Microsoft.AspNetCore.Components.Web.Virtualization
 @using Microsoft.JSInterop
 @using Blog
+@using Blog.Extensions
 @using Blog.Components
 @using Blog.Components.Utils

src/Blog/Extensions/HttpRequestExtensions.cs

@@ -0,0 +1,10 @@
+namespace Blog.Extensions;
+public static class HttpRequestExtensions
+{
+  public static string GetBaseUrl(this HttpRequest request)
+  {
+    var scheme = request.Headers["X-Forwarded-Proto"].FirstOrDefault() ?? request.Scheme;
+    var host = request.Headers["X-Forwarded-Host"].FirstOrDefault() ?? request.Host.Value;
+    return $"{scheme}://{host}";
+  }
+}

src/Blog/Program.cs

@@ -1,3 +1,5 @@
+using Blog.Extensions;
+
 var builder = WebApplication.CreateBuilder(args);
 
 builder.Services.ConfigureOptions<FilePostServiceOptionsSetup>();
@@ -25,12 +27,8 @@ app.UseStatusCodePagesWithRedirects("/Error/{0}");
 app
   .MapGet("/rss", async (HttpContext context, IPostService postService) =>
   {
-    var req = context.Request;
+    var baseUrl = context.Request.GetBaseUrl();
-
+    var url = $"{baseUrl}{context.Request.PathBase}";
-    var scheme = req.Headers["X-Forwarded-Proto"].FirstOrDefault() ?? req.Scheme;
-    var host = req.Headers["X-Forwarded-Host"].FirstOrDefault() ?? req.Host.Value;
-
-    var url = $"{scheme}://{host}{req.PathBase}";
 
     var posts = await postService.GetPostsAsync();