⚡ (openai) Stream chat completion to avoid serverless timeout (#526)

Closes #520

packages/lib/api/encryptionV1.ts

@@ -0,0 +1,20 @@
+import { createDecipheriv } from 'crypto'
+
+const algorithm = 'aes-256-gcm'
+const secretKey = process.env.ENCRYPTION_SECRET
+
+export const decryptV1 = (encryptedData: string, auth: string): object => {
+  if (!secretKey) throw new Error(`ENCRYPTION_SECRET is not in environment`)
+  const [iv, tag] = auth.split('.')
+  const decipher = createDecipheriv(
+    algorithm,
+    secretKey,
+    Buffer.from(iv, 'hex')
+  )
+  decipher.setAuthTag(Buffer.from(tag, 'hex'))
+  return JSON.parse(
+    (
+      decipher.update(Buffer.from(encryptedData, 'hex')) + decipher.final('hex')
+    ).toString()
+  )
+}