Move job queue to redis

We'll use it as cache in the future.

/!\ You'll loose your old jobs (pending jobs too) so upgrade only when
you don't have pending job anymore.

server/lib/job-queue/handlers/utils/activitypub-http-utils.ts

@@ -0,0 +1,39 @@
+import { buildSignedActivity } from '../../../../helpers/activitypub'
+import { getServerActor } from '../../../../helpers/utils'
+import { ActorModel } from '../../../../models/activitypub/actor'
+
+async function computeBody (payload: { body: any, signatureActorId?: number }) {
+  let body = payload.body
+
+  if (payload.signatureActorId) {
+    const actorSignature = await ActorModel.load(payload.signatureActorId)
+    if (!actorSignature) throw new Error('Unknown signature actor id.')
+    body = await buildSignedActivity(actorSignature, payload.body)
+  }
+
+  return body
+}
+
+async function buildSignedRequestOptions (payload: { signatureActorId?: number }) {
+  let actor: ActorModel
+  if (payload.signatureActorId) {
+    actor = await ActorModel.load(payload.signatureActorId)
+    if (!actor) throw new Error('Unknown signature actor id.')
+  } else {
+    // We need to sign the request, so use the server
+    actor = await getServerActor()
+  }
+
+  const keyId = actor.getWebfingerUrl()
+  return {
+    algorithm: 'rsa-sha256',
+    authorizationHeaderName: 'Signature',
+    keyId,
+    key: actor.privateKey
+  }
+}
+
+export {
+  computeBody,
+  buildSignedRequestOptions
+}