d7ad321176
This comprehensive implementation includes: - FastAPI backend with MCP server integration - React/TypeScript frontend with Vite - PostgreSQL database with Redis caching - Grafana/Prometheus monitoring stack - Docker Compose orchestration - Full MCP protocol support for Claude Code integration Features: - Agent discovery and management across network - Visual workflow editor and execution engine - Real-time task coordination and monitoring - Multi-model support with specialized agents - Distributed development task allocation 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
614 lines
26 KiB
JavaScript
614 lines
26 KiB
JavaScript
"use strict";
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var __importDefault = (this && this.__importDefault) || function (mod) {
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return (mod && mod.__esModule) ? mod : { "default": mod };
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.StreamableHTTPServerTransport = void 0;
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const types_js_1 = require("../types.js");
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const raw_body_1 = __importDefault(require("raw-body"));
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const content_type_1 = __importDefault(require("content-type"));
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const node_crypto_1 = require("node:crypto");
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const MAXIMUM_MESSAGE_SIZE = "4mb";
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/**
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* Server transport for Streamable HTTP: this implements the MCP Streamable HTTP transport specification.
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* It supports both SSE streaming and direct HTTP responses.
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*
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* Usage example:
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*
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* ```typescript
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* // Stateful mode - server sets the session ID
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* const statefulTransport = new StreamableHTTPServerTransport({
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* sessionIdGenerator: () => randomUUID(),
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* });
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*
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* // Stateless mode - explicitly set session ID to undefined
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* const statelessTransport = new StreamableHTTPServerTransport({
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* sessionIdGenerator: undefined,
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* });
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*
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* // Using with pre-parsed request body
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* app.post('/mcp', (req, res) => {
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* transport.handleRequest(req, res, req.body);
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* });
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* ```
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*
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* In stateful mode:
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* - Session ID is generated and included in response headers
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* - Session ID is always included in initialization responses
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* - Requests with invalid session IDs are rejected with 404 Not Found
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* - Non-initialization requests without a session ID are rejected with 400 Bad Request
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* - State is maintained in-memory (connections, message history)
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*
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* In stateless mode:
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* - No Session ID is included in any responses
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* - No session validation is performed
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*/
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class StreamableHTTPServerTransport {
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constructor(options) {
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var _a, _b;
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this._started = false;
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this._streamMapping = new Map();
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this._requestToStreamMapping = new Map();
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this._requestResponseMap = new Map();
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this._initialized = false;
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this._enableJsonResponse = false;
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this._standaloneSseStreamId = '_GET_stream';
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this.sessionIdGenerator = options.sessionIdGenerator;
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this._enableJsonResponse = (_a = options.enableJsonResponse) !== null && _a !== void 0 ? _a : false;
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this._eventStore = options.eventStore;
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this._onsessioninitialized = options.onsessioninitialized;
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this._allowedHosts = options.allowedHosts;
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this._allowedOrigins = options.allowedOrigins;
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this._enableDnsRebindingProtection = (_b = options.enableDnsRebindingProtection) !== null && _b !== void 0 ? _b : false;
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}
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/**
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* Starts the transport. This is required by the Transport interface but is a no-op
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* for the Streamable HTTP transport as connections are managed per-request.
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*/
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async start() {
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if (this._started) {
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throw new Error("Transport already started");
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}
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this._started = true;
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}
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/**
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* Validates request headers for DNS rebinding protection.
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* @returns Error message if validation fails, undefined if validation passes.
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*/
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validateRequestHeaders(req) {
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// Skip validation if protection is not enabled
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if (!this._enableDnsRebindingProtection) {
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return undefined;
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}
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// Validate Host header if allowedHosts is configured
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if (this._allowedHosts && this._allowedHosts.length > 0) {
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const hostHeader = req.headers.host;
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if (!hostHeader || !this._allowedHosts.includes(hostHeader)) {
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return `Invalid Host header: ${hostHeader}`;
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}
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}
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// Validate Origin header if allowedOrigins is configured
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if (this._allowedOrigins && this._allowedOrigins.length > 0) {
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const originHeader = req.headers.origin;
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if (!originHeader || !this._allowedOrigins.includes(originHeader)) {
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return `Invalid Origin header: ${originHeader}`;
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}
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}
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return undefined;
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}
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/**
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* Handles an incoming HTTP request, whether GET or POST
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*/
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async handleRequest(req, res, parsedBody) {
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var _a;
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// Validate request headers for DNS rebinding protection
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const validationError = this.validateRequestHeaders(req);
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if (validationError) {
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res.writeHead(403).end(JSON.stringify({
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jsonrpc: "2.0",
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error: {
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code: -32000,
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message: validationError
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},
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id: null
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}));
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(_a = this.onerror) === null || _a === void 0 ? void 0 : _a.call(this, new Error(validationError));
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return;
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}
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if (req.method === "POST") {
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await this.handlePostRequest(req, res, parsedBody);
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}
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else if (req.method === "GET") {
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await this.handleGetRequest(req, res);
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}
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else if (req.method === "DELETE") {
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await this.handleDeleteRequest(req, res);
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}
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else {
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await this.handleUnsupportedRequest(res);
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}
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}
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/**
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* Handles GET requests for SSE stream
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*/
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async handleGetRequest(req, res) {
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// The client MUST include an Accept header, listing text/event-stream as a supported content type.
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const acceptHeader = req.headers.accept;
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if (!(acceptHeader === null || acceptHeader === void 0 ? void 0 : acceptHeader.includes("text/event-stream"))) {
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res.writeHead(406).end(JSON.stringify({
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jsonrpc: "2.0",
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error: {
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code: -32000,
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message: "Not Acceptable: Client must accept text/event-stream"
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},
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id: null
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}));
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return;
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}
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// If an Mcp-Session-Id is returned by the server during initialization,
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// clients using the Streamable HTTP transport MUST include it
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// in the Mcp-Session-Id header on all of their subsequent HTTP requests.
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if (!this.validateSession(req, res)) {
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return;
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}
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if (!this.validateProtocolVersion(req, res)) {
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return;
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}
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// Handle resumability: check for Last-Event-ID header
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if (this._eventStore) {
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const lastEventId = req.headers['last-event-id'];
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if (lastEventId) {
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await this.replayEvents(lastEventId, res);
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return;
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}
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}
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// The server MUST either return Content-Type: text/event-stream in response to this HTTP GET,
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// or else return HTTP 405 Method Not Allowed
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const headers = {
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"Content-Type": "text/event-stream",
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"Cache-Control": "no-cache, no-transform",
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Connection: "keep-alive",
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};
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// After initialization, always include the session ID if we have one
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if (this.sessionId !== undefined) {
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headers["mcp-session-id"] = this.sessionId;
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}
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// Check if there's already an active standalone SSE stream for this session
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if (this._streamMapping.get(this._standaloneSseStreamId) !== undefined) {
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// Only one GET SSE stream is allowed per session
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res.writeHead(409).end(JSON.stringify({
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jsonrpc: "2.0",
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error: {
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code: -32000,
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message: "Conflict: Only one SSE stream is allowed per session"
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},
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id: null
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}));
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return;
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}
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// We need to send headers immediately as messages will arrive much later,
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// otherwise the client will just wait for the first message
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res.writeHead(200, headers).flushHeaders();
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// Assign the response to the standalone SSE stream
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this._streamMapping.set(this._standaloneSseStreamId, res);
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// Set up close handler for client disconnects
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res.on("close", () => {
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this._streamMapping.delete(this._standaloneSseStreamId);
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});
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}
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/**
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* Replays events that would have been sent after the specified event ID
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* Only used when resumability is enabled
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*/
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async replayEvents(lastEventId, res) {
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var _a, _b;
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if (!this._eventStore) {
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return;
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}
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try {
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const headers = {
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"Content-Type": "text/event-stream",
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"Cache-Control": "no-cache, no-transform",
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Connection: "keep-alive",
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};
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if (this.sessionId !== undefined) {
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headers["mcp-session-id"] = this.sessionId;
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}
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res.writeHead(200, headers).flushHeaders();
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const streamId = await ((_a = this._eventStore) === null || _a === void 0 ? void 0 : _a.replayEventsAfter(lastEventId, {
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send: async (eventId, message) => {
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var _a;
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if (!this.writeSSEEvent(res, message, eventId)) {
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(_a = this.onerror) === null || _a === void 0 ? void 0 : _a.call(this, new Error("Failed replay events"));
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res.end();
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}
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}
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}));
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this._streamMapping.set(streamId, res);
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}
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catch (error) {
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(_b = this.onerror) === null || _b === void 0 ? void 0 : _b.call(this, error);
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}
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}
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/**
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* Writes an event to the SSE stream with proper formatting
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*/
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writeSSEEvent(res, message, eventId) {
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let eventData = `event: message\n`;
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// Include event ID if provided - this is important for resumability
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if (eventId) {
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eventData += `id: ${eventId}\n`;
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}
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eventData += `data: ${JSON.stringify(message)}\n\n`;
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return res.write(eventData);
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}
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/**
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* Handles unsupported requests (PUT, PATCH, etc.)
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*/
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async handleUnsupportedRequest(res) {
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res.writeHead(405, {
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"Allow": "GET, POST, DELETE"
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}).end(JSON.stringify({
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jsonrpc: "2.0",
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error: {
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code: -32000,
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message: "Method not allowed."
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},
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id: null
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}));
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}
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/**
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* Handles POST requests containing JSON-RPC messages
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*/
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async handlePostRequest(req, res, parsedBody) {
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var _a, _b, _c, _d, _e;
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try {
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// Validate the Accept header
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const acceptHeader = req.headers.accept;
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// The client MUST include an Accept header, listing both application/json and text/event-stream as supported content types.
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if (!(acceptHeader === null || acceptHeader === void 0 ? void 0 : acceptHeader.includes("application/json")) || !acceptHeader.includes("text/event-stream")) {
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res.writeHead(406).end(JSON.stringify({
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jsonrpc: "2.0",
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error: {
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code: -32000,
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message: "Not Acceptable: Client must accept both application/json and text/event-stream"
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},
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id: null
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}));
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return;
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}
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const ct = req.headers["content-type"];
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if (!ct || !ct.includes("application/json")) {
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res.writeHead(415).end(JSON.stringify({
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jsonrpc: "2.0",
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error: {
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code: -32000,
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message: "Unsupported Media Type: Content-Type must be application/json"
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},
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id: null
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}));
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return;
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}
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const authInfo = req.auth;
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const requestInfo = { headers: req.headers };
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let rawMessage;
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if (parsedBody !== undefined) {
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rawMessage = parsedBody;
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}
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else {
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const parsedCt = content_type_1.default.parse(ct);
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const body = await (0, raw_body_1.default)(req, {
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limit: MAXIMUM_MESSAGE_SIZE,
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encoding: (_a = parsedCt.parameters.charset) !== null && _a !== void 0 ? _a : "utf-8",
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});
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rawMessage = JSON.parse(body.toString());
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}
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let messages;
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// handle batch and single messages
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if (Array.isArray(rawMessage)) {
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messages = rawMessage.map(msg => types_js_1.JSONRPCMessageSchema.parse(msg));
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}
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else {
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messages = [types_js_1.JSONRPCMessageSchema.parse(rawMessage)];
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}
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// Check if this is an initialization request
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// https://spec.modelcontextprotocol.io/specification/2025-03-26/basic/lifecycle/
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const isInitializationRequest = messages.some(types_js_1.isInitializeRequest);
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if (isInitializationRequest) {
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// If it's a server with session management and the session ID is already set we should reject the request
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// to avoid re-initialization.
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if (this._initialized && this.sessionId !== undefined) {
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res.writeHead(400).end(JSON.stringify({
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jsonrpc: "2.0",
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error: {
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code: -32600,
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message: "Invalid Request: Server already initialized"
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},
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id: null
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}));
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return;
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}
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if (messages.length > 1) {
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res.writeHead(400).end(JSON.stringify({
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jsonrpc: "2.0",
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error: {
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code: -32600,
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message: "Invalid Request: Only one initialization request is allowed"
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},
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id: null
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}));
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return;
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}
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this.sessionId = (_b = this.sessionIdGenerator) === null || _b === void 0 ? void 0 : _b.call(this);
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this._initialized = true;
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// If we have a session ID and an onsessioninitialized handler, call it immediately
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// This is needed in cases where the server needs to keep track of multiple sessions
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if (this.sessionId && this._onsessioninitialized) {
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this._onsessioninitialized(this.sessionId);
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}
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}
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if (!isInitializationRequest) {
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// If an Mcp-Session-Id is returned by the server during initialization,
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// clients using the Streamable HTTP transport MUST include it
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// in the Mcp-Session-Id header on all of their subsequent HTTP requests.
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if (!this.validateSession(req, res)) {
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return;
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}
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// Mcp-Protocol-Version header is required for all requests after initialization.
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if (!this.validateProtocolVersion(req, res)) {
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return;
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}
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}
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// check if it contains requests
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const hasRequests = messages.some(types_js_1.isJSONRPCRequest);
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if (!hasRequests) {
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// if it only contains notifications or responses, return 202
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res.writeHead(202).end();
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// handle each message
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for (const message of messages) {
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(_c = this.onmessage) === null || _c === void 0 ? void 0 : _c.call(this, message, { authInfo, requestInfo });
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}
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}
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else if (hasRequests) {
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// The default behavior is to use SSE streaming
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// but in some cases server will return JSON responses
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const streamId = (0, node_crypto_1.randomUUID)();
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if (!this._enableJsonResponse) {
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const headers = {
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"Content-Type": "text/event-stream",
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"Cache-Control": "no-cache",
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Connection: "keep-alive",
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};
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// After initialization, always include the session ID if we have one
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if (this.sessionId !== undefined) {
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headers["mcp-session-id"] = this.sessionId;
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}
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res.writeHead(200, headers);
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}
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// Store the response for this request to send messages back through this connection
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// We need to track by request ID to maintain the connection
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for (const message of messages) {
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if ((0, types_js_1.isJSONRPCRequest)(message)) {
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this._streamMapping.set(streamId, res);
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this._requestToStreamMapping.set(message.id, streamId);
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}
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}
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// Set up close handler for client disconnects
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res.on("close", () => {
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this._streamMapping.delete(streamId);
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});
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// handle each message
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for (const message of messages) {
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(_d = this.onmessage) === null || _d === void 0 ? void 0 : _d.call(this, message, { authInfo, requestInfo });
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}
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// The server SHOULD NOT close the SSE stream before sending all JSON-RPC responses
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// This will be handled by the send() method when responses are ready
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}
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}
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catch (error) {
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// return JSON-RPC formatted error
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res.writeHead(400).end(JSON.stringify({
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jsonrpc: "2.0",
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error: {
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code: -32700,
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message: "Parse error",
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data: String(error)
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},
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id: null
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}));
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(_e = this.onerror) === null || _e === void 0 ? void 0 : _e.call(this, error);
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}
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}
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/**
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* Handles DELETE requests to terminate sessions
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*/
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async handleDeleteRequest(req, res) {
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if (!this.validateSession(req, res)) {
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return;
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}
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if (!this.validateProtocolVersion(req, res)) {
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return;
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}
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await this.close();
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res.writeHead(200).end();
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}
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/**
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* Validates session ID for non-initialization requests
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* Returns true if the session is valid, false otherwise
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*/
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validateSession(req, res) {
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if (this.sessionIdGenerator === undefined) {
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// If the sessionIdGenerator ID is not set, the session management is disabled
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// and we don't need to validate the session ID
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return true;
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}
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if (!this._initialized) {
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// If the server has not been initialized yet, reject all requests
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res.writeHead(400).end(JSON.stringify({
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jsonrpc: "2.0",
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error: {
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code: -32000,
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message: "Bad Request: Server not initialized"
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},
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id: null
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}));
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return false;
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}
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const sessionId = req.headers["mcp-session-id"];
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if (!sessionId) {
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// Non-initialization requests without a session ID should return 400 Bad Request
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res.writeHead(400).end(JSON.stringify({
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jsonrpc: "2.0",
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error: {
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code: -32000,
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message: "Bad Request: Mcp-Session-Id header is required"
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},
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id: null
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}));
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return false;
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}
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else if (Array.isArray(sessionId)) {
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res.writeHead(400).end(JSON.stringify({
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jsonrpc: "2.0",
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error: {
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code: -32000,
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message: "Bad Request: Mcp-Session-Id header must be a single value"
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},
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id: null
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}));
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return false;
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}
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else if (sessionId !== this.sessionId) {
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// Reject requests with invalid session ID with 404 Not Found
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res.writeHead(404).end(JSON.stringify({
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jsonrpc: "2.0",
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error: {
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code: -32001,
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message: "Session not found"
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},
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id: null
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}));
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return false;
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}
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return true;
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}
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validateProtocolVersion(req, res) {
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var _a;
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|
let protocolVersion = (_a = req.headers["mcp-protocol-version"]) !== null && _a !== void 0 ? _a : types_js_1.DEFAULT_NEGOTIATED_PROTOCOL_VERSION;
|
|
if (Array.isArray(protocolVersion)) {
|
|
protocolVersion = protocolVersion[protocolVersion.length - 1];
|
|
}
|
|
if (!types_js_1.SUPPORTED_PROTOCOL_VERSIONS.includes(protocolVersion)) {
|
|
res.writeHead(400).end(JSON.stringify({
|
|
jsonrpc: "2.0",
|
|
error: {
|
|
code: -32000,
|
|
message: `Bad Request: Unsupported protocol version (supported versions: ${types_js_1.SUPPORTED_PROTOCOL_VERSIONS.join(", ")})`
|
|
},
|
|
id: null
|
|
}));
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
async close() {
|
|
var _a;
|
|
// Close all SSE connections
|
|
this._streamMapping.forEach((response) => {
|
|
response.end();
|
|
});
|
|
this._streamMapping.clear();
|
|
// Clear any pending responses
|
|
this._requestResponseMap.clear();
|
|
(_a = this.onclose) === null || _a === void 0 ? void 0 : _a.call(this);
|
|
}
|
|
async send(message, options) {
|
|
let requestId = options === null || options === void 0 ? void 0 : options.relatedRequestId;
|
|
if ((0, types_js_1.isJSONRPCResponse)(message) || (0, types_js_1.isJSONRPCError)(message)) {
|
|
// If the message is a response, use the request ID from the message
|
|
requestId = message.id;
|
|
}
|
|
// Check if this message should be sent on the standalone SSE stream (no request ID)
|
|
// Ignore notifications from tools (which have relatedRequestId set)
|
|
// Those will be sent via dedicated response SSE streams
|
|
if (requestId === undefined) {
|
|
// For standalone SSE streams, we can only send requests and notifications
|
|
if ((0, types_js_1.isJSONRPCResponse)(message) || (0, types_js_1.isJSONRPCError)(message)) {
|
|
throw new Error("Cannot send a response on a standalone SSE stream unless resuming a previous client request");
|
|
}
|
|
const standaloneSse = this._streamMapping.get(this._standaloneSseStreamId);
|
|
if (standaloneSse === undefined) {
|
|
// The spec says the server MAY send messages on the stream, so it's ok to discard if no stream
|
|
return;
|
|
}
|
|
// Generate and store event ID if event store is provided
|
|
let eventId;
|
|
if (this._eventStore) {
|
|
// Stores the event and gets the generated event ID
|
|
eventId = await this._eventStore.storeEvent(this._standaloneSseStreamId, message);
|
|
}
|
|
// Send the message to the standalone SSE stream
|
|
this.writeSSEEvent(standaloneSse, message, eventId);
|
|
return;
|
|
}
|
|
// Get the response for this request
|
|
const streamId = this._requestToStreamMapping.get(requestId);
|
|
const response = this._streamMapping.get(streamId);
|
|
if (!streamId) {
|
|
throw new Error(`No connection established for request ID: ${String(requestId)}`);
|
|
}
|
|
if (!this._enableJsonResponse) {
|
|
// For SSE responses, generate event ID if event store is provided
|
|
let eventId;
|
|
if (this._eventStore) {
|
|
eventId = await this._eventStore.storeEvent(streamId, message);
|
|
}
|
|
if (response) {
|
|
// Write the event to the response stream
|
|
this.writeSSEEvent(response, message, eventId);
|
|
}
|
|
}
|
|
if ((0, types_js_1.isJSONRPCResponse)(message) || (0, types_js_1.isJSONRPCError)(message)) {
|
|
this._requestResponseMap.set(requestId, message);
|
|
const relatedIds = Array.from(this._requestToStreamMapping.entries())
|
|
.filter(([_, streamId]) => this._streamMapping.get(streamId) === response)
|
|
.map(([id]) => id);
|
|
// Check if we have responses for all requests using this connection
|
|
const allResponsesReady = relatedIds.every(id => this._requestResponseMap.has(id));
|
|
if (allResponsesReady) {
|
|
if (!response) {
|
|
throw new Error(`No connection established for request ID: ${String(requestId)}`);
|
|
}
|
|
if (this._enableJsonResponse) {
|
|
// All responses ready, send as JSON
|
|
const headers = {
|
|
'Content-Type': 'application/json',
|
|
};
|
|
if (this.sessionId !== undefined) {
|
|
headers['mcp-session-id'] = this.sessionId;
|
|
}
|
|
const responses = relatedIds
|
|
.map(id => this._requestResponseMap.get(id));
|
|
response.writeHead(200, headers);
|
|
if (responses.length === 1) {
|
|
response.end(JSON.stringify(responses[0]));
|
|
}
|
|
else {
|
|
response.end(JSON.stringify(responses));
|
|
}
|
|
}
|
|
else {
|
|
// End the SSE stream
|
|
response.end();
|
|
}
|
|
// Clean up
|
|
for (const id of relatedIds) {
|
|
this._requestResponseMap.delete(id);
|
|
this._requestToStreamMapping.delete(id);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
exports.StreamableHTTPServerTransport = StreamableHTTPServerTransport;
|
|
//# sourceMappingURL=streamableHttp.js.map
|