misskey/src/remote/activitypub/renderer/index.ts

import config from '../../../config';
import { v4 as uuid } from 'uuid';
import { IActivity } from '../type';
import { LdSignature } from '../misc/ld-signature';
import { ILocalUser } from '../../../models/entities/user';
import { UserKeypairs } from '../../../models';
import { ensure } from '../../../prelude/ensure';

export const renderActivity = (x: any): IActivity | null => {
	if (x == null) return null;

	if (x !== null && typeof x === 'object' && x.id == null) {
		x.id = `${config.url}/${uuid()}`;
	}

	return Object.assign({
		'@context': [
			'https://www.w3.org/ns/activitystreams',
			'https://w3id.org/security/v1'
		]
	}, x);
};

export const attachLdSignature = async (activity: any, user: ILocalUser): Promise<IActivity | null> => {
	if (activity == null) return null;

	const keypair = await UserKeypairs.findOne({
		userId: user.id
	}).then(ensure);

	const obj = {
		// as non-standards
		manuallyApprovesFollowers: 'as:manuallyApprovesFollowers',
		sensitive: 'as:sensitive',
		Hashtag: 'as:Hashtag',
		quoteUrl: 'as:quoteUrl',
		// Mastodon
		toot: 'http://joinmastodon.org/ns#',
		Emoji: 'toot:Emoji',
		featured: 'toot:featured',
		// schema
		schema: 'http://schema.org#',
		PropertyValue: 'schema:PropertyValue',
		value: 'schema:value',
		// Misskey
		misskey: `${config.url}/ns#`,
		'_misskey_content': 'misskey:_misskey_content',
		'_misskey_quote': 'misskey:_misskey_quote',
		'_misskey_reaction': 'misskey:_misskey_reaction',
		'_misskey_votes': 'misskey:_misskey_votes',
		'_misskey_talk': 'misskey:_misskey_talk',
	};

	activity['@context'].push(obj);

	const ldSignature = new LdSignature();
	ldSignature.debug = false;
	activity = await ldSignature.signRsaSignature2017(activity, keypair.privateKey, `${config.url}/users/${user.id}#main-key`);

	return activity;
};