refactor(UserStore): move mute logic to separate function & create isMuted() function

src/storages/UserStore.ts

@@ -1,4 +1,5 @@
 import { NostrEvent, NostrFilter, NStore } from '@nostrify/nostrify';
+
 import { DittoEvent } from '@/interfaces/DittoEvent.ts';
 import { getTagSet } from '@/tags.ts';
 
@@ -16,25 +17,34 @@ export class UserStore implements NStore {
   }
 
   /**
-   * Query events that `pubkey` did not block
+   * Query events that `pubkey` did not mute
    * https://github.com/nostr-protocol/nips/blob/master/51.md#standard-lists
    */
   async query(filters: NostrFilter[], opts: { signal?: AbortSignal; limit?: number } = {}): Promise<DittoEvent[]> {
     const allEvents = await this.store.query(filters, opts);
 
-    const mutedPubkeysEvent = await this.getMuteList();
-    if (!mutedPubkeysEvent) {
-      return allEvents;
-    }
-    const mutedPubkeys = getTagSet(mutedPubkeysEvent.tags, 'p');
+    const mutedPubkeys = await this.getMutedPubkeys();
 
     return allEvents.filter((event) => {
       return event.kind === 0 || mutedPubkeys.has(event.pubkey) === false;
     });
   }
 
+  async isMuted(pubkey: string): Promise<boolean> {
+    const mutedPubkeys = await this.getMutedPubkeys();
+    return mutedPubkeys.has(pubkey);
+  }
+
   private async getMuteList(): Promise<DittoEvent | undefined> {
     const [muteList] = await this.store.query([{ authors: [this.pubkey], kinds: [10000], limit: 1 }]);
     return muteList;
   }
+
+  private async getMutedPubkeys(): Promise<Set<string>> {
+    const mutedPubkeysEvent = await this.getMuteList();
+    if (!mutedPubkeysEvent) {
+      return new Set();
+    }
+    return getTagSet(mutedPubkeysEvent.tags, 'p');
+  }
 }