Add admin signing module

src/admin.ts

@@ -0,0 +1,17 @@
+import { Conf } from '@/config.ts';
+import { finishEvent, nip19 } from '@/deps.ts';
+
+import type { SignedEvent, EventTemplate } from '@/event.ts';
+
+// deno-lint-ignore require-await
+async function signAdminEvent<K extends number = number>(event: EventTemplate<K>): Promise<SignedEvent<K>> {
+  if (!Conf.nsec) throw new Error('No secret key. Set one with DITTO_NSEC.');
+
+  const result = nip19.decode(Conf.nsec);
+
+  if (result.type !== 'nsec') throw new Error('Invalid DITTO_NSEC. It should start with "nsec1..."');
+
+  return finishEvent(event, result.data);
+}
+
+export { signAdminEvent };