@rmdes/indiekit-endpoint-activitypub

ActivityPub federation endpoint for Indiekit. Makes your IndieWeb site a full fediverse actor — discoverable, followable, and interactive from Mastodon, Misskey, Pixelfed, and any ActivityPub-compatible platform.

Features

Federation

• Full ActivityPub actor with WebFinger, NodeInfo, HTTP Signatures, and Object Integrity Proofs (Ed25519)
• Outbox syndication — posts created via Micropub are automatically delivered to followers
• Inbox processing — receives follows, likes, boosts, replies, mentions, deletes, and account moves
• Content negotiation — ActivityPub clients requesting your site get JSON-LD; browsers get HTML
• Reply delivery — replies are addressed to and delivered directly to the original post's author
• Shared inbox support with collection sync (FEP-8fcf)
• Configurable actor type (Person, Service, Organization, Group)

Reader

• Timeline view showing posts from followed accounts
• Notifications for likes, boosts, follows, mentions, and replies
• Compose form with dual-path posting (quick AP reply or Micropub blog post)
• Native interactions (like, boost, reply, follow/unfollow from the reader)
• Remote actor profile pages
• Content warnings and sensitive content handling
• Media display (images, video, audio)
• Configurable timeline retention

Moderation

• Mute actors or keywords
• Block actors (also removes from followers)
• All moderation actions available from the reader UI

Mastodon Migration

• Import following/followers lists from Mastodon CSV exports
• Set alsoKnownAs alias for account Move verification
• Batch re-follow processor — gradually sends Follow activities to imported accounts
• Progress tracking with pause/resume controls

Admin UI

• Dashboard with follower/following counts and recent activity
• Profile editor (name, bio, avatar, header, profile links with rel="me" verification)
• Pinned posts (featured collection)
• Featured tags (hashtag collection)
• Activity log (inbound/outbound)
• Follower and following lists with source tracking

Requirements

• Indiekit v1.0.0-beta.25+
• Node.js >= 22
• MongoDB (used by Indiekit)
• Redis (recommended for production delivery queue; in-process queue available for development)

Installation

npm install @rmdes/indiekit-endpoint-activitypub

Configuration

Add the plugin to your Indiekit config:

// indiekit.config.js
export default {
  plugins: [
    "@rmdes/indiekit-endpoint-activitypub",
  ],
  "@rmdes/indiekit-endpoint-activitypub": {
    mountPath: "/activitypub",
    actor: {
      handle: "yourname",
      name: "Your Name",
      summary: "A short bio",
      icon: "https://example.com/avatar.jpg",
    },
  },
};

All Options

Option	Type	Default	Description
mountPath	string	"/activitypub"	URL prefix for all plugin routes
actor.handle	string	"rick"	Fediverse username (e.g. @handle@yourdomain.com)
actor.name	string	""	Display name (used to seed profile on first run)
actor.summary	string	""	Bio text (used to seed profile on first run)
actor.icon	string	""	Avatar URL (used to seed profile on first run)
checked	boolean	true	Whether the syndicator is checked by default in the post editor
alsoKnownAs	string	""	Mastodon migration alias URL
activityRetentionDays	number	90	Days to keep activity log entries (0 = forever)
storeRawActivities	boolean	false	Store full raw JSON of inbound activities
redisUrl	string	""	Redis connection URL for delivery queue
parallelWorkers	number	5	Number of parallel delivery workers (requires Redis)
actorType	string	"Person"	Actor type: Person, Service, Organization, or Group
timelineRetention	number	1000	Maximum timeline items to keep (0 = unlimited)

Redis (Recommended for Production)

Without Redis, the plugin uses an in-process message queue. This works for development but won't survive restarts and has limited throughput.

"@rmdes/indiekit-endpoint-activitypub": {
  redisUrl: "redis://localhost:6379",
  parallelWorkers: 5,
},

Nginx Configuration (Reverse Proxy)

If you serve a static site alongside Indiekit (e.g. with Eleventy), you need nginx rules to route ActivityPub requests to Indiekit while serving HTML to browsers:

# ActivityPub content negotiation — detect AP clients
map $http_accept $is_activitypub {
    default 0;
    "~*application/activity\+json" 1;
    "~*application/ld\+json" 1;
}

# Proxy /activitypub to Indiekit
location /activitypub {
    proxy_pass http://127.0.0.1:8080;
    proxy_set_header Host $host;
    proxy_set_header X-Forwarded-Proto https;
}

# Default: static site, but AP clients get proxied
location / {
    if ($is_activitypub) {
        proxy_pass http://127.0.0.1:8080;
    }
    try_files $uri $uri/ $uri.html =404;
}

How It Works

Syndication (Outbound)

When you create a post via Micropub, Indiekit's syndication system calls this plugin's syndicator. The plugin:

1. Converts the JF2 post properties to an ActivityStreams 2.0 Create(Note) or Create(Article) activity
2. For replies, resolves the original post's author to include them in CC and deliver directly to their inbox
3. Sends the activity to all followers via shared inboxes using Fedify's delivery queue
4. Appends a permalink to the content so fediverse clients link back to your canonical post

Inbox Processing (Inbound)

When remote servers send activities to your inbox:

• Follow → Auto-accepted, stored in ap_followers, notification created
• Undo(Follow) → Removed from ap_followers
• Like → Logged in activity log, notification created (only for reactions to your own posts)
• Announce (Boost) → Logged + notification (your content) or stored in timeline (followed account)
• Create (Note/Article) → Stored in timeline if from a followed account; notification if it's a reply or mention
• Update → Updates timeline item content or refreshes follower profile data
• Delete → Removes from activity log and timeline
• Move → Updates follower's actor URL
• Accept(Follow) → Marks our follow as accepted
• Reject(Follow) → Marks our follow as rejected
• Block → Removes actor from our followers

Content Negotiation

The plugin mounts a root-level router that intercepts requests from ActivityPub clients (detected by Accept: application/activity+json or application/ld+json):

• Root URL (/) → Redirects to the Fedify actor document
• Post URLs → Looks up the post in MongoDB, converts to AS2 JSON
• NodeInfo (/nodeinfo/2.1) → Delegated to Fedify

Regular browser requests pass through unmodified.

Mastodon Migration

The plugin supports migrating from a Mastodon account:

1. Set alias — Configure alsoKnownAs with your old Mastodon profile URL. This is verified by Mastodon before allowing a Move.
2. Import social graph — Upload Mastodon's following_accounts.csv and followers.csv exports. Following entries are resolved via WebFinger and stored locally.
3. Trigger Move — From Mastodon's settings, initiate a Move to @handle@yourdomain.com. Mastodon notifies your followers, and compatible servers auto-refollow.
4. Batch re-follow — The plugin gradually sends Follow activities to all imported accounts (10 per batch, 30s between batches) so remote servers start delivering content to your inbox.

Verification

After deployment, verify federation is working:

# WebFinger discovery
curl -s "https://yourdomain.com/.well-known/webfinger?resource=acct:handle@yourdomain.com" | jq .

# Actor document
curl -s -H "Accept: application/activity+json" "https://yourdomain.com/" | jq .

# NodeInfo
curl -s "https://yourdomain.com/nodeinfo/2.1" | jq .

Then search for @handle@yourdomain.com from any Mastodon instance — your profile should appear.

Admin UI Pages

All admin pages are behind IndieAuth authentication:

Page	Path	Description
Dashboard	/activitypub	Overview with follower/following counts, recent activity
Reader	/activitypub/admin/reader	Timeline from followed accounts
Notifications	/activitypub/admin/reader/notifications	Likes, boosts, follows, mentions, replies
Compose	/activitypub/admin/reader/compose	Reply composer (quick AP or Micropub)
Moderation	/activitypub/admin/reader/moderation	Muted/blocked accounts and keywords
Profile	/activitypub/admin/profile	Edit actor display name, bio, avatar, links
Followers	/activitypub/admin/followers	List of accounts following you
Following	/activitypub/admin/following	List of accounts you follow
Activity Log	/activitypub/admin/activities	Inbound/outbound activity history
Pinned Posts	/activitypub/admin/featured	Pin/unpin posts to your featured collection
Featured Tags	/activitypub/admin/tags	Add/remove featured hashtags
Migration	/activitypub/admin/migrate	Mastodon import wizard

MongoDB Collections

The plugin creates these collections automatically:

Collection	Description
ap_followers	Accounts following your actor
ap_following	Accounts you follow
ap_activities	Activity log with automatic TTL cleanup
ap_keys	RSA and Ed25519 key pairs for HTTP Signatures
ap_kv	Fedify key-value store and batch job state
ap_profile	Actor profile (single document)
ap_featured	Pinned/featured posts
ap_featured_tags	Featured hashtags
ap_timeline	Reader timeline items from followed accounts
ap_notifications	Interaction notifications
ap_muted	Muted actors and keywords
ap_blocked	Blocked actors
ap_interactions	Per-post like/boost tracking

Supported Post Types

The JF2-to-ActivityStreams converter handles these Indiekit post types:

Post Type	ActivityStreams
note, reply, bookmark, jam, rsvp, checkin	Create(Note)
article	Create(Article)
like	Like
repost	Announce
photo, video, audio	Attachments on Note/Article

Categories are converted to Hashtag tags. Bookmarks include a bookmark emoji and link.

Known Limitations

• No automated tests — Manual testing against real fediverse servers
• Single actor — One fediverse identity per Indiekit instance
• No Authorized Fetch enforcement — Disabled due to Fedify's current limitation with authenticated outgoing fetches (causes infinite loops with servers that require it)
• No image upload in reader — Compose form is text-only
• In-process queue without Redis — Activities may be lost on restart

License

MIT

Author

Ricardo Mendes (@rick@rmendes.net)