feat: add NWC Wallet Service

examples/nwc/client/make-invoice.js

@@ -10,14 +10,19 @@ const rl = readline.createInterface({ input, output });
 const nwcUrl =
   process.env.NWC_URL ||
   (await rl.question("Nostr Wallet Connect URL (nostr+walletconnect://...): "));
+
+const amount =
+  parseInt((await rl.question("Amount in sats (default 1 sat): ")) || "1") *
+  1000;
+
 rl.close();
 
 const client = new nwc.NWCClient({
   nostrWalletConnectUrl: nwcUrl,
 });
 
 const response = await client.makeInvoice({
-  amount: 1000, // in millisats
+  amount, // in millisats
   description: "NWC Client example",
 });
 

examples/nwc/wallet-service/example.js

@@ -0,0 +1,57 @@
+import "websocket-polyfill"; // required in node.js
+
+import { generateSecretKey, getPublicKey } from "nostr-tools";
+import { bytesToHex, hexToBytes } from "@noble/hashes/utils";
+
+const walletServiceSecretKey = bytesToHex(generateSecretKey());
+const walletServicePubkey = getPublicKey(hexToBytes(walletServiceSecretKey));
+
+const clientSecretKey = bytesToHex(generateSecretKey());
+const clientPubkey = getPublicKey(hexToBytes(clientSecretKey));
+
+const relayUrl = "wss://relay.getalby.com/v1";
+
+const nwcUrl = `nostr+walletconnect://${walletServicePubkey}?relay=${relayUrl}&secret=${clientSecretKey}`;
+
+console.info("enter this NWC URL in a client: ", nwcUrl);
+
+import { nwc } from "../../../dist/index.module.js";
+
+const walletService = new nwc.NWCWalletService({
+  relayUrl,
+});
+
+await walletService.publishWalletServiceInfoEvent(
+  walletServiceSecretKey,
+  ["get_info"],
+  [],
+);
+
+const keypair = new nwc.NWCWalletServiceKeyPair(
+  walletServiceSecretKey,
+  clientPubkey,
+);
+
+const unsub = await walletService.subscribe(keypair, {
+  getInfo: () => {
+    return Promise.resolve({
+      result: {
+        methods: ["get_info"],
+        alias: "Alby Hub",
+        //... add other fields here
+      },
+      error: undefined,
+    });
+  },
+  // ... handle other NIP-47 methods here
+});
+
+console.info("Waiting for events...");
+process.on("SIGINT", function () {
+  console.info("Caught interrupt signal");
+
+  unsub();
+  walletService.close();
+
+  process.exit();
+});

src/index.ts

@@ -2,5 +2,5 @@ export * as auth from "./auth";
 export * as types from "./types";
 export * as webln from "./webln";
 export { Client } from "./client";
-export * as nwc from "./NWCClient";
-export * as nwa from "./NWAClient";
+export * as nwa from "./nwc/NWAClient";
+export * as nwc from "./nwc";

src/NWAClient.test.ts → src/nwc/NWAClient.test.ts

@@ -2,7 +2,7 @@ import "websocket-polyfill";
 import { NWAClient } from "./NWAClient";
 import { bytesToHex, hexToBytes } from "@noble/hashes/utils";
 import { generateSecretKey, getPublicKey } from "nostr-tools";
-import { Nip47Method, Nip47NotificationType } from "./NWCClient";
+import { Nip47Method, Nip47NotificationType } from "./types";
 
 describe("NWA URI", () => {
   test("constructs correct connection URI with custom app secret key", () => {

src/NWAClient.ts → src/nwc/NWAClient.ts

@@ -5,8 +5,8 @@ import {
   Nip47Method,
   Nip47NetworkError,
   Nip47NotificationType,
-  NWCClient,
-} from "./NWCClient";
+} from "./types";
+import { NWCClient } from "./NWCClient";
 import { Subscription } from "nostr-tools/lib/types/abstract-relay";
 
 export type NWAOptions = {