server/helpers/activitypub.ts

   1 import * as Bluebird from 'bluebird'
   2 import * as validator from 'validator'
   3 import { ResultList } from '../../shared/models'
   4 import { Activity, ActivityPubActor } from '../../shared/models/activitypub'
   5 import { ACTIVITY_PUB } from '../initializers'
   6 import { ActorModel } from '../models/activitypub/actor'
   7 import { signJsonLDObject } from './peertube-crypto'
   8 import { pageToStartAndCount } from './core-utils'
   9
  10 function activityPubContextify <T> (data: T) {
  11   return Object.assign(data, {
  12     '@context': [
  13       'https://www.w3.org/ns/activitystreams',
  14       'https://w3id.org/security/v1',
  15       {
  16         RsaSignature2017: 'https://w3id.org/security#RsaSignature2017',
  17         pt: 'https://joinpeertube.org/ns',
  18         sc: 'http://schema.org#',
  19         Hashtag: 'as:Hashtag',
  20         uuid: 'sc:identifier',
  21         category: 'sc:category',
  22         licence: 'sc:license',
  23         subtitleLanguage: 'sc:subtitleLanguage',
  24         sensitive: 'as:sensitive',
  25         language: 'sc:inLanguage',
  26         views: 'sc:Number',
  27         state: 'sc:Number',
  28         size: 'sc:Number',
  29         fps: 'sc:Number',
  30         commentsEnabled: 'sc:Boolean',
  31         waitTranscoding: 'sc:Boolean',
  32         expires: 'sc:expires',
  33         support: 'sc:Text',
  34         CacheFile: 'pt:CacheFile'
  35       },
  36       {
  37         likes: {
  38           '@id': 'as:likes',
  39           '@type': '@id'
  40         },
  41         dislikes: {
  42           '@id': 'as:dislikes',
  43           '@type': '@id'
  44         },
  45         shares: {
  46           '@id': 'as:shares',
  47           '@type': '@id'
  48         },
  49         comments: {
  50           '@id': 'as:comments',
  51           '@type': '@id'
  52         }
  53       }
  54     ]
  55   })
  56 }
  57
  58 type ActivityPubCollectionPaginationHandler = (start: number, count: number) => Bluebird<ResultList<any>> | Promise<ResultList<any>>
  59 async function activityPubCollectionPagination (url: string, handler: ActivityPubCollectionPaginationHandler, page?: any) {
  60   if (!page || !validator.isInt(page)) {
  61     // We just display the first page URL, we only need the total items
  62     const result = await handler(0, 1)
  63
  64     return {
  65       id: url,
  66       type: 'OrderedCollection',
  67       totalItems: result.total,
  68       first: url + '?page=1'
  69     }
  70   }
  71
  72   const { start, count } = pageToStartAndCount(page, ACTIVITY_PUB.COLLECTION_ITEMS_PER_PAGE)
  73   const result = await handler(start, count)
  74
  75   let next: string | undefined
  76   let prev: string | undefined
  77
  78   // Assert page is a number
  79   page = parseInt(page, 10)
  80
  81   // There are more results
  82   if (result.total > page * ACTIVITY_PUB.COLLECTION_ITEMS_PER_PAGE) {
  83     next = url + '?page=' + (page + 1)
  84   }
  85
  86   if (page > 1) {
  87     prev = url + '?page=' + (page - 1)
  88   }
  89
  90   return {
  91     id: url + '?page=' + page,
  92     type: 'OrderedCollectionPage',
  93     prev,
  94     next,
  95     partOf: url,
  96     orderedItems: result.data,
  97     totalItems: result.total
  98   }
  99
 100 }
 101
 102 function buildSignedActivity (byActor: ActorModel, data: Object) {
 103   const activity = activityPubContextify(data)
 104
 105   return signJsonLDObject(byActor, activity) as Promise<Activity>
 106 }
 107
 108 function getActorUrl (activityActor: string | ActivityPubActor) {
 109   if (typeof activityActor === 'string') return activityActor
 110
 111   return activityActor.id
 112 }
 113
 114 // ---------------------------------------------------------------------------
 115
 116 export {
 117   getActorUrl,
 118   activityPubContextify,
 119   activityPubCollectionPagination,
 120   buildSignedActivity
 121 }