feat: add get_budget to NWCClient

examples/nwc/client/get-budget.js

@@ -0,0 +1,23 @@
+import "../../crypto-polyfill.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 client = new nwc.NWCClient({
+  nostrWalletConnectUrl: nwcUrl,
+});
+const response = await client.getBudget();
+
+console.info(response);
+
+client.close();

src/NWCClient.ts

@@ -24,6 +24,7 @@ type WithOptionalId = {
 type Nip47SingleMethod =
   | "get_info"
   | "get_balance"
+  | "get_budget"
   | "make_invoice"
   | "pay_invoice"
   | "pay_keysend"
@@ -47,6 +48,16 @@ export type Nip47GetInfoResponse = {
   notifications?: Nip47NotificationType[];
 };
 
+export type Nip47GetBudgetResponse =
+  | {
+      used_budget: number; // msats
+      total_budget: number; // msats
+      renews_at?: number; // timestamp
+      renewal_period: "daily" | "weekly" | "monthly" | "yearly" | "never";
+    }
+  // eslint-disable-next-line @typescript-eslint/ban-types
+  | {};
+
 export type Nip47GetBalanceResponse = {
   balance: number; // msats
 };
@@ -490,6 +501,20 @@ export class NWCClient {
     }
   }
 
+  async getBudget(): Promise<Nip47GetBudgetResponse> {
+    try {
+      const result = await this.executeNip47Request<Nip47GetBudgetResponse>(
+        "get_budget",
+        {},
+        (result) => result !== undefined,
+      );
+      return result;
+    } catch (error) {
+      console.error("Failed to request get_budget", error);
+      throw error;
+    }
+  }
+
   async getBalance(): Promise<Nip47GetBalanceResponse> {
     try {
       const result = await this.executeNip47Request<Nip47GetBalanceResponse>(

src/webln/NostrWeblnProvider.ts

@@ -63,7 +63,10 @@ type Nip07Provider = {
   signEvent(event: UnsignedEvent): Promise<Event>;
 };
 
-const nip47ToWeblnRequestMap: Record<Nip47Method, WebLNMethod> = {
+const nip47ToWeblnRequestMap: Record<
+  Exclude<Nip47Method, "get_budget">,
+  WebLNMethod
+> = {
   get_info: "getInfo",
   get_balance: "getBalance",
   make_invoice: "makeInvoice",