Begin activitypub

1 files changed, 57 insertions, 0 deletions

diff --git a/server/middlewares/activitypub.ts b/server/middlewares/activitypub.ts
new file mode 100644
index 000000000..6cf8eea6f
--- /dev/null
+++ b/server/middlewares/activitypub.ts
@@ -0,0 +1,57 @@
+import { Request, Response, NextFunction } from 'express'
+
+import { database as db } from '../initializers'
+import {
+  logger,
+  getAccountFromWebfinger,
+  isSignatureVerified
+} from '../helpers'
+import { ActivityPubSignature } from '../../shared'
+
+async function checkSignature (req: Request, res: Response, next: NextFunction) {
+  const signatureObject: ActivityPubSignature = req.body.signature
+
+  logger.debug('Checking signature of account %s...', signatureObject.creator)
+
+  let account = await db.Account.loadByUrl(signatureObject.creator)
+
+  // We don't have this account in our database, fetch it on remote
+  if (!account) {
+    account = await getAccountFromWebfinger(signatureObject.creator)
+
+    if (!account) {
+      return res.sendStatus(403)
+    }
+
+    // Save our new account in database
+    await account.save()
+  }
+
+  const verified = await isSignatureVerified(account, req.body)
+  if (verified === false) return res.sendStatus(403)
+
+  res.locals.signature.account = account
+
+  return next()
+}
+
+function executeIfActivityPub (fun: any | any[]) {
+  return (req: Request, res: Response, next: NextFunction) => {
+    if (req.header('Accept') !== 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"') {
+      return next()
+    }
+
+    if (Array.isArray(fun) === true) {
+      fun[0](req, res, next) // FIXME: doesn't work
+    }
+
+    return fun(req, res, next)
+  }
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  checkSignature,
+  executeIfActivityPub
+}