server/controllers/activitypub/inbox.ts

   1 import * as express from 'express'
   2 import { Activity, ActivityPubCollection, ActivityPubOrderedCollection, ActivityType, RootActivity } from '../../../shared'
   3 import { logger } from '../../helpers'
   4 import { isActivityValid } from '../../helpers/custom-validators/activitypub/activity'
   5 import { processCreateActivity, processFlagActivity, processUpdateActivity } from '../../lib'
   6 import { processAddActivity } from '../../lib/activitypub/process-add'
   7 import { asyncMiddleware, checkSignature, signatureValidator } from '../../middlewares'
   8 import { activityPubValidator } from '../../middlewares/validators/activitypub/activity'
   9
  10 const processActivity: { [ P in ActivityType ]: (activity: Activity) => Promise<any> } = {
  11   Create: processCreateActivity,
  12   Add: processAddActivity,
  13   Update: processUpdateActivity,
  14   Flag: processFlagActivity
  15 }
  16
  17 const inboxRouter = express.Router()
  18
  19 inboxRouter.post('/',
  20   signatureValidator,
  21   asyncMiddleware(checkSignature),
  22   activityPubValidator,
  23   asyncMiddleware(inboxController)
  24 )
  25
  26 // ---------------------------------------------------------------------------
  27
  28 export {
  29   inboxRouter
  30 }
  31
  32 // ---------------------------------------------------------------------------
  33
  34 async function inboxController (req: express.Request, res: express.Response, next: express.NextFunction) {
  35   const rootActivity: RootActivity = req.body
  36   let activities: Activity[] = []
  37
  38   if ([ 'Collection', 'CollectionPage' ].indexOf(rootActivity.type) !== -1) {
  39     activities = (rootActivity as ActivityPubCollection).items
  40   } else if ([ 'OrderedCollection', 'OrderedCollectionPage' ].indexOf(rootActivity.type) !== -1) {
  41     activities = (rootActivity as ActivityPubOrderedCollection).orderedItems
  42   } else {
  43     activities = [ rootActivity as Activity ]
  44   }
  45
  46   // Only keep activities we are able to process
  47   activities = activities.filter(a => isActivityValid(a))
  48
  49   await processActivities(activities)
  50
  51   res.status(204).end()
  52 }
  53
  54 async function processActivities (activities: Activity[]) {
  55   for (const activity of activities) {
  56     const activityProcessor = processActivity[activity.type]
  57     if (activityProcessor === undefined) {
  58       logger.warn('Unknown activity type %s.', activity.type, { activityId: activity.id })
  59       continue
  60     }
  61
  62     await activityProcessor(activity)
  63   }
  64 }