@nostr-dev-kit/ndk-wallet/src/wallets/nwc/req.ts

NDK Wallet

import { NDKEvent, NDKKind, type NostrEvent } from "@nostr-dev-kit/ndk";
import type { NDKNWCWallet } from "./index.js";
import { waitForResponse } from "./res.js";
import type { NDKNWCErrorCode, NDKNWCMethod, NDKNWCRequestMap, NDKNWCResponseMap } from "./types.js";

// Base types for requests and responses
export interface NWCRequestBase {
    method: NDKNWCMethod;
    params: Record<string, any>;
}

export interface NWCResponseBase<T = any> {
    result_type: NDKNWCMethod;
    error?: {
        code: NDKNWCErrorCode;
        message: string;
    };
    result: T | null;
}

// Error codes
export type NWCErrorCode =
    | "RATE_LIMITED"
    | "NOT_IMPLEMENTED"
    | "INSUFFICIENT_BALANCE"
    | "QUOTA_EXCEEDED"
    | "RESTRICTED"
    | "UNAUTHORIZED"
    | "INTERNAL"
    | "OTHER"
    | "PAYMENT_FAILED"
    | "NOT_FOUND";

// Common types
export interface Transaction {
    type: "incoming" | "outgoing";
    invoice?: string;
    description?: string;
    description_hash?: string;
    preimage?: string;
    payment_hash: string;
    amount: number;
    fees_paid?: number;
    created_at: number;
    expires_at?: number;
    settled_at?: number;
    metadata?: Record<string, any>;
}

// Method-specific request params
export interface PayInvoiceParams {
    invoice: string;
    amount?: number;
}

export interface MakeInvoiceParams {
    amount: number;
    description?: string;
    description_hash?: string;
    expiry?: number;
}

export interface LookupInvoiceParams {
    payment_hash?: string;
    invoice?: string;
}

export interface ListTransactionsParams {
    from?: number;
    until?: number;
}

export async function sendReq<M extends keyof NDKNWCRequestMap>(
    this: NDKNWCWallet,
    method: M,
    params: NDKNWCRequestMap[M],
): Promise<NWCResponseBase<NDKNWCResponseMap[M]>> {
    if (!this.walletService || !this.signer) {
        throw new Error("Wallet not initialized");
    }

    const event = new NDKEvent(this.ndk, {
        kind: NDKKind.NostrWalletConnectReq,
        tags: [["p", this.walletService.pubkey]],
        content: JSON.stringify({ method, params }),
    } as NostrEvent);

    await event.encrypt(this.walletService, this.signer, "nip04");
    await event.sign(this.signer);

    // Create base response promise
    const responsePromise = new Promise<NWCResponseBase<NDKNWCResponseMap[M]>>((resolve, reject) => {
        waitForResponse
            .call<NDKNWCWallet, [NDKEvent], Promise<NWCResponseBase<NDKNWCResponseMap[M]>>>(this, event)
            .then(resolve)
            .catch(reject);
    });

    // Add timeout race if configured
    if (this.timeout) {
        const timeoutPromise = new Promise<NWCResponseBase<NDKNWCResponseMap[M]>>((_, reject) =>
            setTimeout(() => {
                this.emit("timeout", method);
                reject(new Error(`Request timed out after ${this.timeout}ms`));
            }, this.timeout),
        );

        return Promise.race([responsePromise, timeoutPromise]);
    }

    return responsePromise;
}