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ActivityPub Federation

Enable ActivityPub to federate with Mastodon, Pleroma, Misskey, and other Fediverse servers:

jss start --activitypub --ap-username alice --ap-display-name "Alice" --ap-summary "Hello from JSS!"

Endpoints

Endpoint Description
/.well-known/webfinger Actor discovery (Mastodon searches here)
/.well-known/nodeinfo NodeInfo discovery
/profile/card Actor (returns JSON-LD when Accept: application/activity+json)
/inbox Shared inbox for receiving activities
/profile/card/inbox Personal inbox
/profile/card/outbox User's activities
/profile/card/followers Followers collection
/profile/card/following Following collection

How It Works

  1. Discovery: Mastodon looks up @alice@your.server via WebFinger
  2. Actor: Returns ActivityPub Actor JSON-LD with public key
  3. Follow: Remote servers POST Follow activities to inbox
  4. Accept: JSS auto-accepts follows and sends Accept back
  5. Delivery: Posts are signed with HTTP Signatures and delivered to follower inboxes

Identity Linking

Your WebID (/profile/card#me) becomes your ActivityPub Actor. Link to Nostr identity:

jss start --activitypub --ap-nostr-pubkey <64-char-hex-pubkey>

This adds alsoKnownAs: ["did:nostr:<pubkey>"] to your Actor profile, creating a verifiable link between your Solid, ActivityPub, and Nostr identities (the SAND stack).

Programmatic Usage

import { createServer } from 'javascript-solid-server';

const server = createServer({
  activitypub: true,
  apUsername: 'alice',
  apDisplayName: 'Alice',
  apSummary: 'Building the decentralized web!',
  apNostrPubkey: 'abc123...'  // Optional: links to did:nostr
});

Testing Federation

# Check WebFinger
curl "http://localhost:4443/.well-known/webfinger?resource=acct:alice@localhost:4443"

# Get Actor (AP format)
curl -H "Accept: application/activity+json" http://localhost:4443/profile/card

# Check NodeInfo
curl http://localhost:4443/.well-known/nodeinfo/2.1

Mastodon-compatible API

JSS exposes Mastodon API endpoints so that Mastodon clients (Elk, Phanpy, Ice Cubes) can connect:

jss start --activitypub --idp

Endpoints

Endpoint Description
POST /api/v1/apps Dynamic client registration
GET /api/v1/accounts/verify_credentials Current user profile
GET /api/v1/instance Instance metadata
GET /oauth/authorize OAuth authorize page
POST /oauth/authorize Process login
POST /oauth/token Exchange code for Bearer token

OAuth 2.0 Flow

The OAuth layer is shared between Mastodon clients, remoteStorage apps, and third-party Solid panes:

  1. Client registers via POST /api/v1/apps (gets client_id + client_secret)
  2. Client redirects user to GET /oauth/authorize?client_id=...&redirect_uri=...&response_type=code
  3. User logs in, JSS redirects back with ?code=...
  4. Client exchanges code for Bearer token via POST /oauth/token
  5. Bearer token works with all JSS endpoints (Solid, ActivityPub, remoteStorage)

Supports out-of-band (OOB) redirect for CLI/desktop clients.

Testing

# Register a client
curl -X POST http://localhost:4443/api/v1/apps \
  -H "Content-Type: application/json" \
  -d '{"client_name": "Test App", "redirect_uris": "urn:ietf:wg:oauth:2.0:oob"}'

# Check instance info
curl http://localhost:4443/api/v1/instance
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