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 { signObject } 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         'Hashtag': 'as:Hashtag',
  18         'uuid': 'http://schema.org/identifier',
  19         'category': 'http://schema.org/category',
  20         'licence': 'http://schema.org/license',
  21         'sensitive': 'as:sensitive',
  22         'language': 'http://schema.org/inLanguage',
  23         'views': 'http://schema.org/Number',
  24         'size': 'http://schema.org/Number',
  25         'commentsEnabled': 'http://schema.org/Boolean',
  26         'support': 'http://schema.org/Text'
  27       },
  28       {
  29         likes: {
  30           '@id': 'as:likes',
  31           '@type': '@id'
  32         },
  33         dislikes: {
  34           '@id': 'as:dislikes',
  35           '@type': '@id'
  36         },
  37         shares: {
  38           '@id': 'as:shares',
  39           '@type': '@id'
  40         },
  41         comments: {
  42           '@id': 'as:comments',
  43           '@type': '@id'
  44         }
  45       }
  46     ]
  47   })
  48 }
  49
  50 type ActivityPubCollectionPaginationHandler = (start: number, count: number) => Bluebird<ResultList<any>> | Promise<ResultList<any>>
  51 async function activityPubCollectionPagination (url: string, handler: ActivityPubCollectionPaginationHandler, page?: any) {
  52   if (!page || !validator.isInt(page)) {
  53     // We just display the first page URL, we only need the total items
  54     const result = await handler(0, 1)
  55
  56     return {
  57       id: url,
  58       type: 'OrderedCollection',
  59       totalItems: result.total,
  60       first: url + '?page=1'
  61     }
  62   }
  63
  64   const { start, count } = pageToStartAndCount(page, ACTIVITY_PUB.COLLECTION_ITEMS_PER_PAGE)
  65   const result = await handler(start, count)
  66
  67   let next: string
  68   let prev: string
  69
  70   // Assert page is a number
  71   page = parseInt(page, 10)
  72
  73   // There are more results
  74   if (result.total > page * ACTIVITY_PUB.COLLECTION_ITEMS_PER_PAGE) {
  75     next = url + '?page=' + (page + 1)
  76   }
  77
  78   if (page > 1) {
  79     prev = url + '?page=' + (page - 1)
  80   }
  81
  82   return {
  83     id: url + '?page=' + page,
  84     type: 'OrderedCollectionPage',
  85     prev,
  86     next,
  87     partOf: url,
  88     orderedItems: result.data,
  89     totalItems: result.total
  90   }
  91
  92 }
  93
  94 function buildSignedActivity (byActor: ActorModel, data: Object) {
  95   const activity = activityPubContextify(data)
  96
  97   return signObject(byActor, activity) as Promise<Activity>
  98 }
  99
 100 function getActorUrl (activityActor: string | ActivityPubActor) {
 101   if (typeof activityActor === 'string') return activityActor
 102
 103   return activityActor.id
 104 }
 105
 106 // ---------------------------------------------------------------------------
 107
 108 export {
 109   getActorUrl,
 110   activityPubContextify,
 111   activityPubCollectionPagination,
 112   buildSignedActivity
 113 }