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1 | import { eachSeries } from 'async' | |
2 | import { NextFunction, Request, RequestHandler, Response } from 'express' | |
3 | import { ActivityPubSignature } from '../../shared' | |
4 | import { isSignatureVerified, logger } from '../helpers' | |
5 | import { ACCEPT_HEADERS, ACTIVITY_PUB } from '../initializers' | |
6 | import { getOrCreateActorAndServerAndModel } from '../lib/activitypub' | |
7 | import { ActorModel } from '../models/activitypub/actor' | |
8 | ||
9 | async function checkSignature (req: Request, res: Response, next: NextFunction) { | |
10 | const signatureObject: ActivityPubSignature = req.body.signature | |
11 | ||
12 | const [ creator ] = signatureObject.creator.split('#') | |
13 | ||
14 | logger.debug('Checking signature of actor %s...', creator) | |
15 | ||
16 | let actor: ActorModel | |
17 | try { | |
18 | actor = await getOrCreateActorAndServerAndModel(creator) | |
19 | } catch (err) { | |
20 | logger.error('Cannot create remote actor and check signature.', err) | |
21 | return res.sendStatus(403) | |
22 | } | |
23 | ||
24 | const verified = await isSignatureVerified(actor, req.body) | |
25 | if (verified === false) return res.sendStatus(403) | |
26 | ||
27 | res.locals.signature = { | |
28 | actor | |
29 | } | |
30 | ||
31 | return next() | |
32 | } | |
33 | ||
34 | function executeIfActivityPub (fun: RequestHandler | RequestHandler[]) { | |
35 | return (req: Request, res: Response, next: NextFunction) => { | |
36 | const accepted = req.accepts(ACCEPT_HEADERS) | |
37 | if (accepted === false || ACTIVITY_PUB.POTENTIAL_ACCEPT_HEADERS.indexOf(accepted) === -1) { | |
38 | return next() | |
39 | } | |
40 | ||
41 | logger.debug('ActivityPub request for %s.', req.url) | |
42 | ||
43 | if (Array.isArray(fun) === true) { | |
44 | return eachSeries(fun as RequestHandler[], (f, cb) => { | |
45 | f(req, res, cb) | |
46 | }, next) | |
47 | } | |
48 | ||
49 | return (fun as RequestHandler)(req, res, next) | |
50 | } | |
51 | } | |
52 | ||
53 | // --------------------------------------------------------------------------- | |
54 | ||
55 | export { | |
56 | checkSignature, | |
57 | executeIfActivityPub | |
58 | } |