Merge pull request #40 from NielsPilgaard/fix-feed-validation-errors

Add additional required feed nodes

Author: NielsPilgaard

src/Pilgaard.Blog/Features/Feed/FeedApi.cs

@@ -1,16 +1,16 @@
 using Microsoft.SyndicationFeed;
-using System.Xml;
 using Microsoft.SyndicationFeed.Atom;
 using Pilgaard.Blog.Features.BlogPost;
 using Pilgaard.Blog.Features.SEO;
+using System.Xml;
 
 namespace Pilgaard.Blog.Features.Feed;
 
 public static class FeedApi
 {
     public static WebApplication MapRssFeed(this WebApplication app)
     {
-        app.MapGet("/feed.xml", async (HttpContext context) =>
+        app.MapGet(FeedConstants.FeedRoute, async (HttpContext context) =>
         {
             context.Response.ContentType = "application/xml";
 
@@ -24,40 +24,9 @@ public static WebApplication MapRssFeed(this WebApplication app)
 
             var writer = new AtomFeedWriter(xmlWriter);
 
-            await writer.WriteTitle(DefaultMetadata.Title);
-
-            var lastUpdated = BlogPostData
-                .AllBlogPostSeries
-                .SelectMany(blogPostSeries => blogPostSeries.BlogPosts.Select(blogPost => blogPost.LastUpdated))
-                .Max();
+            await WriteHeader(writer);
 
-            await writer.WriteUpdated(lastUpdated);
-            await writer.Write(new SyndicationLink(new Uri(FeedConstants.BlogUrl)));
-
-            foreach (var blogPostSeries in BlogPostData.AllBlogPostSeries)
-            {
-                foreach (var blogPost in blogPostSeries.BlogPosts)
-                {
-                    var link = $"{FeedConstants.BlogUrl}/{blogPostSeries.GetRelativePath(blogPost)}";
-                    var item = new SyndicationItem
-                    {
-                        Id = link,
-                        Title = blogPost.Title,
-                        Description = blogPost.Description,
-                        Published = blogPost.PublishDate,
-                        LastUpdated = blogPost.LastUpdated,
-                    };
-
-                    item.AddLink(new SyndicationLink(new Uri(link)));
-                    item.AddContributor(new SyndicationPerson("Niels Pilgaard Grøndahl", "[email protected]"));
-                    foreach (var blogPostTag in blogPost.Tags)
-                    {
-                        item.AddCategory(new SyndicationCategory(blogPostTag));
-                    }
-
-                    await writer.Write(item);
-                }
-            }
+            await WriteBody(writer);
 
             // This closes the <content> element
             await xmlWriter.WriteEndElementAsync();
@@ -69,4 +38,47 @@ public static WebApplication MapRssFeed(this WebApplication app)
 
         return app;
     }
+
+    private static async Task WriteBody(ISyndicationFeedWriter writer)
+    {
+        foreach (var blogPostSeries in BlogPostData.AllBlogPostSeries)
+        {
+            foreach (var blogPost in blogPostSeries.BlogPosts)
+            {
+                var link = $"{FeedConstants.BlogUrl}/{blogPostSeries.GetRelativePath(blogPost)}";
+                var item = new SyndicationItem
+                {
+                    Id = link,
+                    Title = blogPost.Title,
+                    Description = blogPost.Description,
+                    Published = blogPost.PublishDate,
+                    LastUpdated = blogPost.LastUpdated,
+                };
+
+                item.AddLink(new SyndicationLink(new Uri(link)));
+                item.AddContributor(new SyndicationPerson("Niels Pilgaard Grøndahl", "[email protected]"));
+                foreach (var blogPostTag in blogPost.Tags)
+                {
+                    item.AddCategory(new SyndicationCategory(blogPostTag));
+                }
+
+                await writer.Write(item);
+            }
+        }
+    }
+
+    private static async Task WriteHeader(AtomFeedWriter writer)
+    {
+        await writer.WriteTitle(DefaultMetadata.Title);
+
+        var lastUpdated = BlogPostData
+            .AllBlogPostSeries
+            .SelectMany(blogPostSeries => blogPostSeries.BlogPosts.Select(blogPost => blogPost.LastUpdated))
+            .Max();
+
+        await writer.WriteUpdated(lastUpdated);
+        await writer.WriteId(FeedConstants.FeedUrl);
+        await writer.Write(new SyndicationLink(new Uri(FeedConstants.FeedUrl), "self"));
+        await writer.Write(new SyndicationLink(new Uri(FeedConstants.BlogUrl), "alternate"));
+    }
 }

src/Pilgaard.Blog/Features/Feed/FeedConstants.cs

@@ -3,4 +3,6 @@
 internal static class FeedConstants
 {
     internal const string BlogUrl = "https://pilgaard-blog.azurewebsites.net";
+    internal const string FeedRoute = "/feed.xml";
+    internal const string FeedUrl = BlogUrl + FeedRoute;
 }