feat: add accepts_zaps_cashu boolean field to DittoEvent and hydrate it

packages/ditto/interfaces/DittoEvent.ts

@@ -57,4 +57,6 @@ export interface DittoEvent extends NostrEvent {
   zap_message?: string;
   /** Language of the event (kind 1s are more accurate). */
   language?: LanguageCode;
+  /** Whether or not pubkey accepts cashu. */
+  accepts_zaps_cashu?: boolean;
 }

packages/ditto/storages/hydrate.ts

@@ -50,6 +50,10 @@ async function hydrateEvents(opts: HydrateOpts): Promise<DittoEvent[]> {
     cache.push(event);
   }
 
+  for (const event of await gatherAcceptCashu({ ...opts, events: cache })) {
+    cache.push(event);
+  }
+
   const authorStats = await gatherAuthorStats(cache, db.kysely);
   const eventStats = await gatherEventStats(cache, db.kysely);
 
@@ -194,6 +198,10 @@ export function assembleEvents(
       event.zap_message = zapRequest?.content ?? '';
     }
 
+    event.accepts_zaps_cashu = b.find((e) => matchFilter({ kinds: [10019], authors: [event.pubkey] }, e))
+      ? true
+      : false;
+
     event.author_stats = authorStats[event.pubkey];
     event.event_stats = eventStats[event.id];
   }
@@ -353,6 +361,24 @@ async function gatherInfo({ conf, events, relay, signal }: HydrateOpts): Promise
   );
 }
 
+/** Collect nutzap informational events. */
+function gatherAcceptCashu({ events, relay, signal }: HydrateOpts): Promise<DittoEvent[]> {
+  const pubkeys = new Set<string>();
+
+  for (const event of events) {
+    pubkeys.add(event.pubkey);
+  }
+
+  if (!pubkeys.size) {
+    return Promise.resolve([]);
+  }
+
+  return relay.query(
+    [{ kinds: [10019], authors: [...pubkeys], limit: pubkeys.size }],
+    { signal },
+  );
+}
+
 /** Collect author stats from the events. */
 async function gatherAuthorStats(
   events: DittoEvent[],

packages/ditto/views/mastodon/accounts.ts

@@ -117,6 +117,7 @@ function renderAccount(event: Omit<DittoEvent, 'id' | 'sig'>, opts: ToAccountOpt
     username: parsed05?.nickname || npub.substring(0, 8),
     ditto: {
       accepts_zaps: Boolean(getLnurl({ lud06, lud16 })),
+      accepts_zaps_cashu: Boolean(event?.accepts_zaps_cashu),
       external_url: Conf.external(nprofile),
       streak: {
         days: streakDays,

packages/mastoapi/types/MastodonAccount.ts

@@ -44,6 +44,7 @@ export interface MastodonAccount {
   username: string;
   ditto: {
     accepts_zaps: boolean;
+    accepts_zaps_cashu: boolean;
     external_url: string;
     streak: {
       days: number;