workspace with decoupled nostr package

packages/app/src/Feed/MuteList.ts

@@ -0,0 +1,41 @@
+import { useMemo } from "react";
+
+import { getNewest } from "Util";
+import { HexKey, TaggedRawEvent, Lists } from "@snort/nostr";
+import { EventKind, Subscriptions } from "@snort/nostr";
+import useSubscription, { NoteStore } from "Feed/Subscription";
+
+export default function useMutedFeed(pubkey: HexKey) {
+  const sub = useMemo(() => {
+    const sub = new Subscriptions();
+    sub.Id = `muted:${pubkey.slice(0, 12)}`;
+    sub.Kinds = new Set([EventKind.PubkeyLists]);
+    sub.Authors = new Set([pubkey]);
+    sub.DTags = new Set([Lists.Muted]);
+    sub.Limit = 1;
+    return sub;
+  }, [pubkey]);
+
+  return useSubscription(sub);
+}
+
+export function getMutedKeys(rawNotes: TaggedRawEvent[]): {
+  createdAt: number;
+  keys: HexKey[];
+} {
+  const newest = getNewest(rawNotes);
+  if (newest) {
+    const { created_at, tags } = newest;
+    const keys = tags.filter(t => t[0] === "p").map(t => t[1]);
+    return {
+      keys,
+      createdAt: created_at,
+    };
+  }
+  return { createdAt: 0, keys: [] };
+}
+
+export function getMuted(feed: NoteStore, pubkey: HexKey): HexKey[] {
+  const lists = feed?.notes.filter(a => a.kind === EventKind.PubkeyLists && a.pubkey === pubkey);
+  return getMutedKeys(lists).keys;
+}