feat: create MuteListPolicy class

src/policies/MuteListPolicy.ts

@@ -0,0 +1,23 @@
+import { NostrEvent, NostrRelayOK, NPolicy, NStore } from '@nostrify/nostrify';
+
+import { getTagSet } from '@/tags.ts';
+
+export class MuteListPolicy implements NPolicy {
+  constructor(private pubkey: string, private store: NStore) {
+    this.store = store;
+    this.pubkey = pubkey;
+  }
+
+  async call(event: NostrEvent): Promise<NostrRelayOK> {
+    const allowEvent = ['OK', event.id, true, ''] as NostrRelayOK;
+    const blockEvent = ['OK', event.id, false, 'You are banned in this server.'] as NostrRelayOK;
+
+    const [muteList] = await this.store.query([{ authors: [this.pubkey], kinds: [10000], limit: 1 }]);
+    if (!muteList) return allowEvent;
+
+    const mutedPubkeys = getTagSet(muteList.tags, 'p');
+    if (mutedPubkeys.has(event.pubkey)) return blockEvent;
+
+    return allowEvent;
+  }
+}