feat: send zap

src/nostr/builder/createZapRequest.ts

@@ -0,0 +1,45 @@
+import * as Kind from 'nostr-tools/kinds';
+import { type UnsignedEvent } from 'nostr-tools/pure';
+
+import lnurlPayUrlToLud06 from '@/nostr/zap/lnurlPayUrlToLud06';
+import epoch from '@/utils/epoch';
+
+const createZapRequest = ({
+  pubkey,
+  content,
+  relays,
+  recipientPubkey,
+  eventId,
+  amountMilliSats,
+  lnurlPayUrl,
+}: {
+  pubkey: string;
+  content: string;
+  relays: string[];
+  recipientPubkey: string;
+  eventId?: string;
+  amountMilliSats: string;
+  lnurlPayUrl: string;
+}): UnsignedEvent => {
+  if (parseInt(amountMilliSats, 10) === 0) throw new Error('amount is zero');
+  if (relays.length === 0) throw new Error('relays is empty');
+
+  const tags: string[][] = [
+    ['relays', ...relays],
+    ['amount', amountMilliSats],
+    ['lnurl', lnurlPayUrlToLud06(lnurlPayUrl)],
+    ['p', recipientPubkey],
+  ];
+  if (eventId != null) tags.push(['e', eventId]);
+
+  const event: UnsignedEvent = {
+    kind: Kind.ZapRequest,
+    pubkey,
+    created_at: epoch(),
+    tags,
+    content,
+  };
+  return event;
+};
+
+export default createZapRequest;