@getalby/mcp/build/sse.js

MCP server for controlling a Lightning wallet using Nostr Wallet Connect

import { nwc } from "@getalby/sdk";
import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
import { createMCPServer } from "./mcp_server.js";
import { getConnectionSecret } from "./auth.js";
export function addSSEEndpoints(app) {
    // Store transports for each session type
    // SSE is deprecated so we do not put much effort in here (e.g. cleaning up unused sessions)
    const sessions = {};
    app.get("/sse", async (req, res) => {
        const nostrWalletConnectUrl = getConnectionSecret(req.header("Authorization"), req.query.nwc);
        if (!nostrWalletConnectUrl) {
            res
                .status(400)
                .send("Bearer auth with NWC connection secret or nwc query parameter not provided");
            return;
        }
        const client = new nwc.NWCClient({
            nostrWalletConnectUrl,
        });
        const transport = new SSEServerTransport("/messages", res);
        const server = createMCPServer(client);
        sessions[transport.sessionId] = {
            server,
            transport,
        };
        console.info("Created new SSE session", transport.sessionId);
        if (req.query.sessionId) {
            console.info("Request provided its own session ID: " + req.query.sessionId);
            sessions[req.query.sessionId] = {
                server,
                transport,
            };
        }
        server.connect(transport);
    });
    app.post("/messages", (req, res) => {
        const sessionId = req.query.sessionId;
        console.info("SSE messages request", sessionId);
        const session = sessions[sessionId];
        if (session) {
            console.info("Found session for messages request", sessionId);
            session.transport.handlePostMessage(req, res);
        }
        else {
            res
                .status(400)
                .send("No transport found for sessionId: " + req.query.sessionId);
        }
    });
}