sign: refactor the unnecessarily complex awaitSignedEvent function

src/sign.ts

@@ -58,7 +58,7 @@ async function signNostrConnect<K extends number = number>(event: EventTemplate<
 }
 
 /** Wait for signed event to be sent through Nostr relay. */
-function awaitSignedEvent<K extends number = number>(
+async function awaitSignedEvent<K extends number = number>(
   pubkey: string,
   messageId: string,
   c: AppContext,
@@ -69,17 +69,13 @@ function awaitSignedEvent<K extends number = number>(
     Sub.close(messageId);
   }
 
-  return new Promise((resolve, reject) => {
   const timeout = setTimeout(() => {
     close();
-      reject(
-        new HTTPException(408, {
+    throw new HTTPException(408, {
       res: c.json({ id: 'ditto.timeout', error: 'Signing timeout' }),
-        }),
-      );
+    });
   }, Time.minutes(1));
 
-    (async () => {
   for await (const event of sub) {
     if (event.kind === 24133) {
       const decrypted = await decryptAdmin(event.pubkey, event.content);
@@ -88,11 +84,14 @@ function awaitSignedEvent<K extends number = number>(
       if (msg.id === messageId) {
         close();
         clearTimeout(timeout);
-            resolve(msg.result as Event<K>);
+        return msg.result as Event<K>;
       }
     }
   }
-    })();
+
+  // This should never happen.
+  throw new HTTPException(500, {
+    res: c.json({ id: 'ditto.sign', error: 'Unable to sign event' }, 500),
   });
 }