Enrich AP posts: Note type, images, hashtags, HTML excerpt

- Switch object type from Article to Note (Mastodon first-class support)
- Include title + excerpt as HTML content with "Read more" link
- Feature image + up to 3 inline images as AP attachments
- Post tags as AP Hashtag objects with inline links in content

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bp/blog/ghost/ghost_sync.py

@@ -1,7 +1,9 @@
 from __future__ import annotations
 import os
+import re
 import asyncio
 from datetime import datetime
+from html import escape as html_escape
 from typing import Dict, Any, Optional
 
 import httpx
@@ -993,6 +995,81 @@ async def fetch_single_tag_from_ghost(ghost_id: str) -> Optional[dict[str, Any]]
     return tags[0] if tags else None
 
 
+def _build_ap_post_data(post, post_url: str, tag_objs: list) -> dict:
+    """Build rich AP object_data for a blog post/page.
+
+    Produces a Note with HTML content (excerpt), feature image + inline
+    images as attachments, and tags as AP Hashtag objects.
+    """
+    # Content HTML: title + excerpt + "Read more" link
+    parts: list[str] = []
+    if post.title:
+        parts.append(f"<p>{html_escape(post.title)}</p>")
+
+    excerpt = post.custom_excerpt or post.excerpt or ""
+    if not excerpt and post.plaintext:
+        excerpt = post.plaintext[:500]
+        if len(post.plaintext) > 500:
+            excerpt = excerpt.rsplit(" ", 1)[0] + "\u2026"
+
+    if excerpt:
+        for para in excerpt.split("\n\n"):
+            para = para.strip()
+            if para:
+                parts.append(f"<p>{html_escape(para)}</p>")
+
+    parts.append(f'<p><a href="{html_escape(post_url)}">Read more \u2192</a></p>')
+
+    # Hashtag links in content (Mastodon expects them inline too)
+    if tag_objs:
+        ht_links = []
+        for t in tag_objs:
+            clean = t.slug.replace("-", "")
+            ht_links.append(
+                f'<a href="{html_escape(post_url)}tag/{t.slug}/" rel="tag">#{clean}</a>'
+            )
+        parts.append(f'<p>{" ".join(ht_links)}</p>')
+
+    obj: dict = {
+        "name": post.title or "",
+        "content": "\n".join(parts),
+        "url": post_url,
+    }
+
+    # Attachments: feature image + inline images (max 4)
+    attachments: list[dict] = []
+    seen: set[str] = set()
+
+    if post.feature_image:
+        att: dict = {"type": "Image", "url": post.feature_image}
+        if post.feature_image_alt:
+            att["name"] = post.feature_image_alt
+        attachments.append(att)
+        seen.add(post.feature_image)
+
+    if post.html:
+        for src in re.findall(r'<img[^>]+src="([^"]+)"', post.html):
+            if src not in seen and len(attachments) < 4:
+                attachments.append({"type": "Image", "url": src})
+                seen.add(src)
+
+    if attachments:
+        obj["attachment"] = attachments
+
+    # AP Hashtag objects
+    if tag_objs:
+        obj["tag"] = [
+            {
+                "type": "Hashtag",
+                "href": f"{post_url}tag/{t.slug}/",
+                "name": f"#{t.slug.replace('-', '')}",
+            }
+            for t in tag_objs
+        ]
+
+    return obj
+
+
 async def sync_single_post(sess: AsyncSession, ghost_id: str) -> None:
     gp = await fetch_single_post_from_ghost(ghost_id)
     if gp is None:
@@ -1028,6 +1105,7 @@ async def sync_single_post(sess: AsyncSession, ghost_id: str) -> None:
         from shared.services.federation_publish import try_publish
         from shared.infrastructure.urls import app_url
         post_url = app_url("coop", f"/{post.slug}/")
+        post_tags = [tag_map[t["id"]] for t in (gp.get("tags") or []) if t["id"] in tag_map]
 
         if post.status == "published":
             activity_type = "Create" if old_status != "published" else "Update"
@@ -1035,12 +1113,8 @@ async def sync_single_post(sess: AsyncSession, ghost_id: str) -> None:
                 sess,
                 user_id=post.user_id,
                 activity_type=activity_type,
-                object_type="Article",
-                object_data={
-                    "name": post.title or "",
-                    "content": post.custom_excerpt or post.excerpt or "",
-                    "url": post_url,
-                },
+                object_type="Note",
+                object_data=_build_ap_post_data(post, post_url, post_tags),
                 source_type="Post",
                 source_id=post.id,
             )
@@ -1052,7 +1126,7 @@ async def sync_single_post(sess: AsyncSession, ghost_id: str) -> None:
                 object_type="Tombstone",
                 object_data={
                     "id": post_url,
-                    "formerType": "Article",
+                    "formerType": "Note",
                 },
                 source_type="Post",
                 source_id=post.id,
@@ -1096,6 +1170,7 @@ async def sync_single_page(sess: AsyncSession, ghost_id: str) -> None:
         from shared.services.federation_publish import try_publish
         from shared.infrastructure.urls import app_url
         post_url = app_url("coop", f"/{post.slug}/")
+        post_tags = [tag_map[t["id"]] for t in (gp.get("tags") or []) if t["id"] in tag_map]
 
         if post.status == "published":
             activity_type = "Create" if old_status != "published" else "Update"
@@ -1103,12 +1178,8 @@ async def sync_single_page(sess: AsyncSession, ghost_id: str) -> None:
                 sess,
                 user_id=post.user_id,
                 activity_type=activity_type,
-                object_type="Article",
-                object_data={
-                    "name": post.title or "",
-                    "content": post.custom_excerpt or post.excerpt or "",
-                    "url": post_url,
-                },
+                object_type="Note",
+                object_data=_build_ap_post_data(post, post_url, post_tags),
                 source_type="Post",
                 source_id=post.id,
             )
@@ -1120,7 +1191,7 @@ async def sync_single_page(sess: AsyncSession, ghost_id: str) -> None:
                 object_type="Tombstone",
                 object_data={
                     "id": post_url,
-                    "formerType": "Article",
+                    "formerType": "Note",
                 },
                 source_type="Post",
                 source_id=post.id,