Add JSON Feed syndication

PancakesWeb/Controllers/FeedController.cs

@@ -1,8 +1,11 @@
 using System.Net.Mime;
 using System.ServiceModel.Syndication;
+using System.Text.Json.Serialization;
 using System.Xml;
 using Microsoft.AspNetCore.Mvc;
 using PancakesWeb.Components.UI;
+using J = System.Text.Json.Serialization.JsonPropertyNameAttribute;
+using JI = System.Text.Json.Serialization.JsonIgnoreAttribute;
 
 namespace PancakesWeb.Controllers;
 
@@ -45,4 +48,124 @@ public class FeedController : ControllerBase
 
         return Content(stringWriter.ToString(), "application/atom+xml");
     }
+
+    [HttpGet("/feed.json")]
+    [Produces("application/feed+json", MediaTypeNames.Application.Json)]
+    public JsonFeed GetJsonFeed() => new JsonFeed
+    {
+        Title = "pancakes' blog",
+        HomePageUrl = "https://pancakes.gay",
+        FeedUrl = "https://pancakes.gay/feed.json",
+        Description = "🐈‍⬛",
+        Icon = "https://pancakes.gay/icon.webp",
+        Favicon = "https://pancakes.gay/favicon.ico",
+        Authors =
+        [
+            new JsonFeedAuthor
+            {
+                Name = "pancakes",
+                Url = "https://pancakes.gay",
+                Avatar = "https://pancakes.gay/icon.webp"
+            }
+        ],
+        Language = "en",
+        Items = BlogPosts.Posts.OrderByDescending(post => post.Published).Select(post => new JsonFeedItem
+        {
+            Id = $"https://pancakes.gay/{post.Slug}",
+            Url = $"https://pancakes.gay/{post.Slug}",
+            Title = post.Title,
+            ContentHtml = post.Content,
+            Summary = post.Description,
+            BannerImage = $"https://pancakes.gay/post-assets/{post.Slug}/{post.HeaderFilename}",
+            DatePublished = post.Published,
+            DateModified = post.Edited,
+            Tags = null
+        }).ToList()
+    };
+
+    public class JsonFeed
+    {
+        [J("version")] public string Version => "https://jsonfeed.org/version/1.1";
+        [J("title")] public required string Title { get; set; }
+
+        [J("home_page_url")]
+        [JI(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public string? HomePageUrl { get; set; }
+
+        [J("feed_url")]
+        [JI(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public string? FeedUrl { get; set; }
+
+        [J("description")]
+        [JI(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public string? Description { get; set; }
+
+        [J("icon")]
+        [JI(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public string? Icon { get; set; }
+
+        [J("favicon")]
+        [JI(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public string? Favicon { get; set; }
+
+        [J("authors")]
+        [JI(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public List<JsonFeedAuthor>? Authors { get; set; }
+
+        [J("language")]
+        [JI(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public string? Language { get; set; }
+
+        [J("items")] public List<JsonFeedItem> Items { get; set; } = [];
+    }
+
+    public class JsonFeedAuthor
+    {
+        [J("name")]
+        [JI(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public string? Name { get; set; }
+
+        [J("url")]
+        [JI(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public string? Url { get; set; }
+
+        [J("avatar")]
+        [JI(Condition = JsonIgnoreCondition.Never)]
+        public string? Avatar { get; set; }
+    }
+
+    public class JsonFeedItem
+    {
+        [J("id")] public required string Id { get; set; }
+
+        [J("url")]
+        [JI(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public string? Url { get; set; }
+
+        [J("title")]
+        [JI(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public string? Title { get; set; }
+
+        [J("content_html")] public required string ContentHtml { get; set; }
+
+        [J("summary")]
+        [JI(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public string? Summary { get; set; }
+
+        [J("banner_image")]
+        [JI(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public string? BannerImage { get; set; }
+
+        [J("date_published")]
+        [JI(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public DateTime? DatePublished { get; set; }
+
+        [J("date_modified")]
+        [JI(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public DateTime? DateModified { get; set; }
+
+        [J("tags")]
+        [JI(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public List<string>? Tags { get; set; }
+    }
 }