server/middlewares/activitypub.ts

   1 import { eachSeries } from 'async'
   2 import { NextFunction, Request, RequestHandler, Response } from 'express'
   3 import { ActivityPubSignature } from '../../shared'
   4 import { logger } from '../helpers/logger'
   5 import { isSignatureVerified } from '../helpers/peertube-crypto'
   6 import { ACCEPT_HEADERS, ACTIVITY_PUB } from '../initializers'
   7 import { getOrCreateActorAndServerAndModel } from '../lib/activitypub'
   8 import { ActorModel } from '../models/activitypub/actor'
   9
  10 async function checkSignature (req: Request, res: Response, next: NextFunction) {
  11   const signatureObject: ActivityPubSignature = req.body.signature
  12
  13   const [ creator ] = signatureObject.creator.split('#')
  14
  15   logger.debug('Checking signature of actor %s...', creator)
  16
  17   let actor: ActorModel
  18   try {
  19     actor = await getOrCreateActorAndServerAndModel(creator)
  20   } catch (err) {
  21     logger.error('Cannot create remote actor and check signature.', err)
  22     return res.sendStatus(403)
  23   }
  24
  25   const verified = await isSignatureVerified(actor, req.body)
  26   if (verified === false) return res.sendStatus(403)
  27
  28   res.locals.signature = {
  29     actor
  30   }
  31
  32   return next()
  33 }
  34
  35 function executeIfActivityPub (fun: RequestHandler | RequestHandler[]) {
  36   return (req: Request, res: Response, next: NextFunction) => {
  37     const accepted = req.accepts(ACCEPT_HEADERS)
  38     if (accepted === false || ACTIVITY_PUB.POTENTIAL_ACCEPT_HEADERS.indexOf(accepted) === -1) {
  39       return next()
  40     }
  41
  42     logger.debug('ActivityPub request for %s.', req.url)
  43
  44     if (Array.isArray(fun) === true) {
  45       return eachSeries(fun as RequestHandler[], (f, cb) => {
  46         f(req, res, cb)
  47       }, next)
  48     }
  49
  50     return (fun as RequestHandler)(req, res, next)
  51   }
  52 }
  53
  54 // ---------------------------------------------------------------------------
  55
  56 export {
  57   checkSignature,
  58   executeIfActivityPub
  59 }