1 files changed, 67 insertions, 0 deletions

diff --git a/server/lib/activitypub/actors/webfinger.ts b/server/lib/activitypub/actors/webfinger.ts
new file mode 100644
index 000000000..cf8eddfc7
--- /dev/null
+++ b/server/lib/activitypub/actors/webfinger.ts
@@ -0,0 +1,67 @@
+import * as WebFinger from 'webfinger.js'
+import { isTestInstance } from '@server/helpers/core-utils'
+import { isActivityPubUrlValid } from '@server/helpers/custom-validators/activitypub/misc'
+import { WEBSERVER } from '@server/initializers/constants'
+import { ActorModel } from '@server/models/actor/actor'
+import { MActorFull } from '@server/types/models'
+import { WebFingerData } from '@shared/models'
+
+const webfinger = new WebFinger({
+  webfist_fallback: false,
+  tls_only: isTestInstance(),
+  uri_fallback: false,
+  request_timeout: 3000
+})
+
+async function loadActorUrlOrGetFromWebfinger (uriArg: string) {
+  // Handle strings like @toto@example.com
+  const uri = uriArg.startsWith('@') ? uriArg.slice(1) : uriArg
+
+  const [ name, host ] = uri.split('@')
+  let actor: MActorFull
+
+  if (!host || host === WEBSERVER.HOST) {
+    actor = await ActorModel.loadLocalByName(name)
+  } else {
+    actor = await ActorModel.loadByNameAndHost(name, host)
+  }
+
+  if (actor) return actor.url
+
+  return getUrlFromWebfinger(uri)
+}
+
+async function getUrlFromWebfinger (uri: string) {
+  const webfingerData: WebFingerData = await webfingerLookup(uri)
+  return getLinkOrThrow(webfingerData)
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  getUrlFromWebfinger,
+  loadActorUrlOrGetFromWebfinger
+}
+
+// ---------------------------------------------------------------------------
+
+function getLinkOrThrow (webfingerData: WebFingerData) {
+  if (Array.isArray(webfingerData.links) === false) throw new Error('WebFinger links is not an array.')
+
+  const selfLink = webfingerData.links.find(l => l.rel === 'self')
+  if (selfLink === undefined || isActivityPubUrlValid(selfLink.href) === false) {
+    throw new Error('Cannot find self link or href is not a valid URL.')
+  }
+
+  return selfLink.href
+}
+
+function webfingerLookup (nameWithHost: string) {
+  return new Promise<WebFingerData>((res, rej) => {
+    webfinger.lookup(nameWithHost, (err, p) => {
+      if (err) return rej(err)
+
+      return res(p.object)
+    })
+  })
+}