113 lines
3.3 KiB
JavaScript
113 lines
3.3 KiB
JavaScript
#!/usr/bin/env node
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import cors from "cors";
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import EventSource from "eventsource";
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import { SSEClientTransport } from "@modelcontextprotocol/sdk/client/sse.js";
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import {
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StdioClientTransport,
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getDefaultEnvironment,
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} from "@modelcontextprotocol/sdk/client/stdio.js";
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import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
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import express from "express";
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import mcpProxy from "./mcpProxy.js";
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// Polyfill EventSource for an SSE client in Node.js
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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(global as any).EventSource = EventSource;
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const app = express();
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app.use(cors());
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let webAppTransports: SSEServerTransport[] = [];
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const createTransport = async (query: express.Request["query"]) => {
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console.log("Query parameters:", query);
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const transportType = query.transportType as string;
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if (transportType === "stdio") {
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const command = query.command as string;
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const args = (query.args as string).split(/\s+/);
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const env = query.env ? JSON.parse(query.env as string) : undefined;
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console.log(
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`Stdio transport: command=${command}, args=${args}, env=${JSON.stringify(env)}`,
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);
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const transport = new StdioClientTransport({ command, args, env });
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await transport.start();
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console.log("Spawned stdio transport");
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return transport;
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} else if (transportType === "sse") {
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const url = query.url as string;
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console.log(`SSE transport: url=${url}`);
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const transport = new SSEClientTransport(new URL(url));
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await transport.start();
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console.log("Connected to SSE transport");
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return transport;
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} else {
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console.error(`Invalid transport type: ${transportType}`);
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throw new Error("Invalid transport type specified");
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}
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};
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app.get("/sse", async (req, res) => {
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try {
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console.log("New SSE connection");
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const backingServerTransport = await createTransport(req.query);
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console.log("Connected MCP client to backing server transport");
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const webAppTransport = new SSEServerTransport("/message", res);
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console.log("Created web app transport");
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webAppTransports.push(webAppTransport);
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console.log("Created web app transport");
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await webAppTransport.start();
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mcpProxy({
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transportToClient: webAppTransport,
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transportToServer: backingServerTransport,
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onerror: (error) => {
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console.error(error);
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},
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});
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console.log("Set up MCP proxy");
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} catch (error) {
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console.error("Error in /sse route:", error);
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res.status(500).json(error);
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}
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});
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app.post("/message", async (req, res) => {
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try {
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const sessionId = req.query.sessionId;
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console.log(`Received message for sessionId ${sessionId}`);
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const transport = webAppTransports.find((t) => t.sessionId === sessionId);
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if (!transport) {
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res.status(404).end("Session not found");
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return;
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}
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await transport.handlePostMessage(req, res);
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} catch (error) {
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console.error("Error in /message route:", error);
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res.status(500).json(error);
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}
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});
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app.get("/default-environment", (req, res) => {
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try {
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res.json(getDefaultEnvironment());
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} catch (error) {
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console.error("Error in /default-environment route:", error);
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res.status(500).json(error);
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}
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});
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const PORT = process.env.PORT || 3000;
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app.listen(PORT, () => {
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console.log(`Server is running on port ${PORT}`);
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});
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