feat: relay handshake logic, handle Follow/Accept, send back Accept.

src/activitypub/helpers.js

@@ -198,6 +198,9 @@ Helpers.resolveLocalId = async (input) => {
 
 				case 'message':
 					return { type: 'message', id: value, ...activityData };
+
+				case 'actor':
+					return { type: 'application', id: null };
 			}
 
 			return { type: null, id: null, ...activityData };

src/activitypub/inbox.js

@@ -367,9 +367,12 @@ inbox.announce = async (req) => {
 
 inbox.follow = async (req) => {
 	const { actor, object, id: followId } = req.body;
+
 	// Sanity checks
 	const { type, id } = await helpers.resolveLocalId(object.id);
-	if (!['category', 'user'].includes(type)) {
+	if (type === 'application') {
+		return activitypub.relays.handshake(req.body);
+	} else if (!['category', 'user'].includes(type)) {
 		throw new Error('[[error:activitypub.invalid-id]]');
 	}
 
@@ -454,7 +457,9 @@ inbox.accept = async (req) => {
 	const { type } = object;
 
 	const { type: localType, id } = await helpers.resolveLocalId(object.actor);
-	if (!['user', 'category'].includes(localType)) {
+	if (object.id === `${nconf.get('url')}/actor`) {
+		return activitypub.relays.handshake(req.body);
+	} else if (!['user', 'category'].includes(localType)) {
 		throw new Error('[[error:invalid-data]]');
 	}
 

src/activitypub/relays.js

@@ -90,6 +90,32 @@ Relays.remove = async (url) => {
 	]);
 };
 
-Relays.handshake = async (activity) => {
+Relays.handshake = async (object) => {
-	console.log(activity);
+	const now = new Date();
+	const { type, actor } = object;
+
+	// Confirm relay was added
+	const exists = await db.isSortedSetMember('relays:createtime', actor);
+	if (!exists) {
+		throw new Error('[[error:api.400]]');
+	}
+
+	if (type === 'Follow') {
+		await db.sortedSetIncrBy('relays:state', 1, actor);
+		await activitypub.send('uid', 0, actor, {
+			'@context': [
+				'https://www.w3.org/ns/activitystreams',
+				'https://pleroma.example/schemas/litepub-0.1.jsonld',
+			],
+			id: `${nconf.get('url')}/actor#activity/accept/${encodeURIComponent(actor)}/${now.getTime()}`,
+			type: 'Accept',
+			to: [actor],
+			published: now.toISOString(),
+			object,
+		});
+	} else if (type === 'Accept') {
+		await db.sortedSetIncrBy('relays:state', 1, actor);
+	} else {
+		throw new Error('[[error:api.400]]');
+	}
 };