✨ Better ap object builder in post

2026-01-01 11:25:19 +08:00
parent a72dbcfc0c
commit fb15930611
3 changed files with 98 additions and 71 deletions
--- a/DysonNetwork.Sphere/ActivityPub/ActivityPubObjectFactory.cs
+++ b/DysonNetwork.Sphere/ActivityPub/ActivityPubObjectFactory.cs
@@ -0,0 +1,69 @@
+using System.Text;
+using DysonNetwork.Shared.Models;
+using Markdig;
+
+namespace DysonNetwork.Sphere.ActivityPub;
+
+public static class ActivityPubObjectFactory
+{
+    public static readonly string[] PublicTo = ["https://www.w3.org/ns/activitystreams#Public"];
+
+    public static Dictionary<string, object> CreatePostObject(
+        IConfiguration configuration,
+        SnPost post,
+        string actorUrl
+    )
+    {
+        var baseDomain = configuration["ActivityPub:Domain"] ?? "localhost";
+        var assetsBaseUrl = configuration["ActivityPub:FileBaseUrl"] ?? $"https://{baseDomain}/files";
+        var postUrl = $"https://{baseDomain}/posts/{post.Id}";
+
+        // Build content by combining title, description, and main content
+        var contentBuilder = new StringBuilder();
+
+        if (!string.IsNullOrWhiteSpace(post.Title))
+            contentBuilder.Append($"# {post.Title}\n\n");
+
+        if (!string.IsNullOrWhiteSpace(post.Description))
+            contentBuilder.Append($"{post.Description}\n\n");
+
+        if (!string.IsNullOrWhiteSpace(post.Content))
+            contentBuilder.Append(post.Content);
+
+        // Ensure content is not empty for ActivityPub compatibility
+        if (contentBuilder.Length == 0)
+            contentBuilder.Append("Shared media");
+
+        if (post.Tags.Count > 0)
+        {
+            contentBuilder.Append("\n\n");
+            contentBuilder.Append(
+                string.Join(' ', post.Tags.Select(x => $"#{x.Slug}"))
+            );
+        }
+
+        var finalContent = contentBuilder.ToString();
+
+        var postObject = new Dictionary<string, object>
+        {
+            ["id"] = postUrl,
+            ["type"] = post.Type == PostType.Article ? "Article" : "Note",
+            ["published"] = (post.PublishedAt ?? post.CreatedAt).ToDateTimeOffset(),
+            ["attributedTo"] = actorUrl,
+            ["content"] = Markdown.ToHtml(finalContent),
+            ["to"] = PublicTo,
+            ["cc"] = new[] { $"{actorUrl}/followers" },
+            ["attachment"] = post.Attachments.Select(a => new Dictionary<string, object>
+            {
+                ["type"] = "Document",
+                ["mediaType"] = a.MimeType ?? "media/jpeg",
+                ["url"] = $"{assetsBaseUrl}/{a.Id}"
+            }).ToList<object>()
+        };
+
+        if (post.EditedAt.HasValue)
+            postObject["updated"] = post.EditedAt.Value.ToDateTimeOffset();
+
+        return postObject;
+    }
+}