server/middlewares/activitypub.ts

   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     console.log(accepted)
  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 }