NodeBB/src/activitypub/feps.js

'use strict';

const nconf = require('nconf');

const posts = require('../posts');

const activitypub = module.parent.exports;
const Feps = module.exports;

Feps.announce = async function announce(id, activity) {
	let localId;
	if (String(id).startsWith(nconf.get('url'))) {
		({ id: localId } = await activitypub.helpers.resolveLocalId(id));
	}
	const cid = await posts.getCidByPid(localId || id);
	if (cid === -1) {
		return;
	}

	const followers = await activitypub.notes.getCategoryFollowers(cid);
	if (!followers.length) {
		return;
	}

	const { actor } = activity;
	if (actor && !actor.startsWith(nconf.get('url'))) {
		followers.unshift(actor);
	}
	const now = Date.now();
	if (activity.type === 'Create') {
		const isMain = await posts.isMain(localId || id);
		if (isMain) {
			activitypub.helpers.log(`[activitypub/inbox.announce(1b12)] Announcing plain object (${activity.id}) to followers of cid ${cid}`);
			await activitypub.send('cid', cid, followers, {
				id: `${nconf.get('url')}/post/${encodeURIComponent(id)}#activity/announce/${now}`,
				type: 'Announce',
				actor: `${nconf.get('url')}/category/${cid}`,
				to: [`${nconf.get('url')}/category/${cid}/followers`],
				cc: [actor, activitypub._constants.publicAddress],
				object: activity.object,
			});
		}
	}

	activitypub.helpers.log(`[activitypub/inbox.announce(1b12)] Announcing ${activity.type} (${activity.id}) to followers of cid ${cid}`);
	await activitypub.send('cid', cid, followers, {
		id: `${nconf.get('url')}/post/${encodeURIComponent(id)}#activity/announce/${now + 1}`,
		type: 'Announce',
		actor: `${nconf.get('url')}/category/${cid}`,
		to: [`${nconf.get('url')}/category/${cid}/followers`],
		cc: [actor, activitypub._constants.publicAddress],
		object: activity,
	});
};