PeerTube/server/middlewares/activitypub.ts

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import { eachSeries } from 'async'
import { NextFunction, Request, RequestHandler, Response } from 'express'
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import { ActivityPubSignature } from '../../shared'
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import { logger } from '../helpers/logger'
import { isSignatureVerified } from '../helpers/peertube-crypto'
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import { ACCEPT_HEADERS, ACTIVITY_PUB } from '../initializers'
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import { getOrCreateActorAndServerAndModel } from '../lib/activitypub'
import { ActorModel } from '../models/activitypub/actor'
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async function checkSignature (req: Request, res: Response, next: NextFunction) {
const signatureObject: ActivityPubSignature = req.body.signature
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const [ creator ] = signatureObject.creator.split('#')
logger.debug('Checking signature of actor %s...', creator)
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let actor: ActorModel
try {
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actor = await getOrCreateActorAndServerAndModel(creator)
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} catch (err) {
logger.warn('Cannot create remote actor %s and check signature.', creator, { err })
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return res.sendStatus(403)
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}
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const verified = await isSignatureVerified(actor, req.body)
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if (verified === false) return res.sendStatus(403)
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res.locals.signature = {
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actor
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}
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return next()
}
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function executeIfActivityPub (fun: RequestHandler | RequestHandler[]) {
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return (req: Request, res: Response, next: NextFunction) => {
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const accepted = req.accepts(ACCEPT_HEADERS)
if (accepted === false || ACTIVITY_PUB.POTENTIAL_ACCEPT_HEADERS.indexOf(accepted) === -1) {
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return next()
}
logger.debug('ActivityPub request for %s.', req.url)
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if (Array.isArray(fun) === true) {
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return eachSeries(fun as RequestHandler[], (f, cb) => {
f(req, res, cb)
}, next)
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}
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return (fun as RequestHandler)(req, res, next)
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}
}
// ---------------------------------------------------------------------------
export {
checkSignature,
executeIfActivityPub
}