feat: add discord interactions worker

packages/interactions/utils/config.ts

@@ -0,0 +1,10 @@
+const self = global as any as Record<string, string>;
+
+const env = (key: string) => self[key] ?? '';
+
+const safeURI = (x: string) => x.replace(/\/$/, '');
+const list = (x: string) => x.split(',');
+
+export const uiPublicURI = safeURI(env('UI_PUBLIC_URI'));
+export const apiPublicURI = safeURI(env('API_PUBLIC_URI'));
+export const publicKey = safeURI(env('DISCORD_PUBLIC_KEY'));

packages/interactions/utils/interactions.ts

@@ -0,0 +1,25 @@
+import { publicKey } from '@roleypoly/interactions/utils/config';
+import nacl from 'tweetnacl';
+
+export const verifyRequest = async (request: Request): Promise<boolean> => {
+  const timestamp = request.headers.get('x-signature-timestamp');
+  const signature = request.headers.get('x-signature-ed25519');
+
+  if (!timestamp || !signature) {
+    return false;
+  }
+
+  const body = await request.json();
+
+  if (
+    !nacl.sign.detached.verify(
+      Buffer.from(timestamp + JSON.stringify(body)),
+      Buffer.from(signature, 'hex'),
+      Buffer.from(publicKey, 'hex')
+    )
+  ) {
+    return false;
+  }
+
+  return true;
+};