server/helpers/webfinger.ts

   1 import * as WebFinger from 'webfinger.js'
   2
   3 import { isTestInstance } from './core-utils'
   4 import { isActivityPubUrlValid } from './custom-validators'
   5 import { WebFingerData } from '../../shared'
   6 import { fetchRemoteAccountAndCreateServer } from './activitypub'
   7
   8 const webfinger = new WebFinger({
   9   webfist_fallback: false,
  10   tls_only: isTestInstance(),
  11   uri_fallback: false,
  12   request_timeout: 3000
  13 })
  14
  15 async function getAccountFromWebfinger (nameWithHost: string) {
  16   const webfingerData: WebFingerData = await webfingerLookup(nameWithHost)
  17
  18   if (Array.isArray(webfingerData.links) === false) throw new Error('WebFinger links is not an array.')
  19
  20   const selfLink = webfingerData.links.find(l => l.rel === 'self')
  21   if (selfLink === undefined || isActivityPubUrlValid(selfLink.href) === false) {
  22     throw new Error('Cannot find self link or href is not a valid URL.')
  23   }
  24
  25   const res = await fetchRemoteAccountAndCreateServer(selfLink.href)
  26   if (res === undefined) throw new Error('Cannot fetch and create server of remote account ' + selfLink.href)
  27
  28   return res.account
  29 }
  30
  31 // ---------------------------------------------------------------------------
  32
  33 export {
  34   getAccountFromWebfinger
  35 }
  36
  37 // ---------------------------------------------------------------------------
  38
  39 function webfingerLookup (nameWithHost: string) {
  40   return new Promise<WebFingerData>((res, rej) => {
  41     webfinger.lookup(nameWithHost, (err, p) => {
  42       if (err) return rej(err)
  43
  44       return res(p.object)
  45     })
  46   })
  47 }