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| 1 | +import { McpServer } from '@modelcontextprotocol/sdk/server/mcp'; |
| 2 | +import { StreamableHTTPServerTransport } from '@modelcontextprotocol/sdk/server/streamableHttp.js'; |
| 3 | + |
| 4 | +import express from 'express'; |
| 5 | +import { McpOptions } from './options'; |
| 6 | +import { initMcpServer, newMcpServer } from './server'; |
| 7 | +import { parseAuthHeaders } from './headers'; |
| 8 | +import { Endpoint } from './tools'; |
| 9 | + |
| 10 | +const newServer = (mcpOptions: McpOptions, req: express.Request, res: express.Response): McpServer | null => { |
| 11 | + const server = newMcpServer(); |
| 12 | + try { |
| 13 | + const authOptions = parseAuthHeaders(req); |
| 14 | + initMcpServer({ |
| 15 | + server: server, |
| 16 | + clientOptions: { |
| 17 | + ...authOptions, |
| 18 | + defaultHeaders: { |
| 19 | + 'X-Stainless-MCP': 'true', |
| 20 | + }, |
| 21 | + }, |
| 22 | + mcpOptions, |
| 23 | + }); |
| 24 | + } catch { |
| 25 | + res.status(401).json({ |
| 26 | + jsonrpc: '2.0', |
| 27 | + error: { |
| 28 | + code: -32000, |
| 29 | + message: 'Unauthorized', |
| 30 | + }, |
| 31 | + }); |
| 32 | + return null; |
| 33 | + } |
| 34 | + |
| 35 | + return server; |
| 36 | +}; |
| 37 | + |
| 38 | +const post = (defaultOptions: McpOptions) => async (req: express.Request, res: express.Response) => { |
| 39 | + const server = newServer(defaultOptions, req, res); |
| 40 | + // If we return null, we already set the authorization error. |
| 41 | + if (server === null) return; |
| 42 | + const transport = new StreamableHTTPServerTransport({ |
| 43 | + // Stateless server |
| 44 | + sessionIdGenerator: undefined, |
| 45 | + }); |
| 46 | + await server.connect(transport); |
| 47 | + await transport.handleRequest(req, res, req.body); |
| 48 | +}; |
| 49 | + |
| 50 | +const get = async (req: express.Request, res: express.Response) => { |
| 51 | + res.status(405).json({ |
| 52 | + jsonrpc: '2.0', |
| 53 | + error: { |
| 54 | + code: -32000, |
| 55 | + message: 'Method not supported', |
| 56 | + }, |
| 57 | + }); |
| 58 | +}; |
| 59 | + |
| 60 | +const del = async (req: express.Request, res: express.Response) => { |
| 61 | + res.status(405).json({ |
| 62 | + jsonrpc: '2.0', |
| 63 | + error: { |
| 64 | + code: -32000, |
| 65 | + message: 'Method not supported', |
| 66 | + }, |
| 67 | + }); |
| 68 | +}; |
| 69 | + |
| 70 | +export const launchStreamableHTTPServer = async ( |
| 71 | + options: McpOptions, |
| 72 | + endpoints: Endpoint[], |
| 73 | + port: number | undefined, |
| 74 | +) => { |
| 75 | + const app = express(); |
| 76 | + app.use(express.json()); |
| 77 | + |
| 78 | + app.get('/', get); |
| 79 | + app.post('/', post(options)); |
| 80 | + app.delete('/', del); |
| 81 | + |
| 82 | + console.error(`MCP Server running on streamable HTTP on port ${port}`); |
| 83 | + |
| 84 | + app.listen(port); |
| 85 | +}; |
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