feat: add NWC client method to get wallet service supported methods

examples/nwc/client/get-wallet-service-supported-methods.js

@@ -0,0 +1,21 @@
+import * as crypto from "node:crypto"; // required in node.js
+global.crypto = crypto; // required in node.js
+import "websocket-polyfill"; // required in node.js
+
+import * as readline from "node:readline/promises";
+import { stdin as input, stdout as output } from "node:process";
+
+import { nwc } from "../../../dist/index.module.js";
+
+const rl = readline.createInterface({ input, output });
+
+const nwcUrl =
+  process.env.NWC_URL ||
+  (await rl.question("Nostr Wallet Connect URL (nostr+walletconnect://...): "));
+rl.close();
+
+const response = await nwc.NWCClient.getWalletServiceSupportedMethods(
+  nwc.NWCClient.parseWalletConnectUrl(nwcUrl),
+);
+
+console.info(response);

src/NWCClient.ts

@@ -181,6 +181,35 @@ export class NWCClient {
     return new NWCClient(options);
   }
 
+  static async getWalletServiceSupportedMethods(
+    options?: ConstructorParameters<typeof NWCClient>[0],
+  ): Promise<Nip47Method[]> {
+    const client = NWCClient.withNewSecret(options);
+    await client.relay.connect();
+
+    const events = await client.relay.list(
+      [
+        {
+          kinds: [13194],
+          limit: 1,
+          authors: [client.walletPubkey],
+        },
+      ],
+      {
+        eoseSubTimeout: 10000,
+      },
+    );
+
+    client.relay.close();
+
+    if (!events.length) {
+      throw new Error("no info event (kind 13194) returned from relay");
+    }
+    const result = events[0].content;
+    // delimiter is " " per spec, but Alby NWC originally returned ","
+    return result.split(/[ |,]/g) as Nip47Method[];
+  }
+
   constructor(options?: NewNWCClientOptions) {
     if (options && options.nostrWalletConnectUrl) {
       options = {