diff --git a/.dockerignore b/.dockerignore new file mode 100644 index 0000000..cbd74f7 --- /dev/null +++ b/.dockerignore @@ -0,0 +1,26 @@ +node_modules +/dist + +.git +.github + +.env +.env.* + +npm-debug.log* +yarn-error.log* +pnpm-debug.log* +*.log +.eslintcache +.cache +.tmp + +coverage +.nyc_output + +.DS_Store +.vscode +.idea + +.cursor +.agent-tools diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..897bb0d --- /dev/null +++ b/Dockerfile @@ -0,0 +1,24 @@ +# syntax=docker/dockerfile:1 + +FROM node:22-alpine AS build +WORKDIR /app + +COPY package.json package-lock.json ./ +RUN npm ci --omit=optional + +COPY tsconfig.json ./ +COPY src ./src +COPY README.md ./ +RUN npm run build + +FROM node:22-alpine +WORKDIR /app +ENV NODE_ENV=production + +COPY package.json package-lock.json ./ +RUN npm ci --omit=dev --omit=optional +COPY --from=build /app/dist ./dist + +USER node +EXPOSE 3000 +CMD ["node", "dist/mcp.js"] diff --git a/README.md b/README.md index b360196..2245c1b 100644 --- a/README.md +++ b/README.md @@ -36,6 +36,35 @@ Installation will vary depending on your client, but in most cases you'll need t } ``` +### Streamable HTTP transport (optional) + +This server also exposes an HTTP transport using the MCP Streamable HTTP spec. Keep the stdio CLI entry as-is; use HTTP when you want to connect over a URL. + +- Endpoint: `GET/POST /mcp` (default path; configurable with `MCP_PATH`) +- Port: `PORT` env (default `3000`) +- Auth header (required): send either + - `Authorization: Bearer ` + - or `x-cal-api-key: ` (or `x-api-key`) + +Run locally (no build step): + +```bash +PORT=3000 MCP_PATH=/mcp npm run dev +``` + +Connect with MCP Inspector: + +1. Open the Inspector. +2. Transport: Streamable HTTP +3. Server URL: `http://localhost:3000/mcp` +4. Headers: + - `Authorization: Bearer ` + - Inspector handles required `Accept` headers automatically. + +Notes: +- The server manages sessions per `mcp-session-id`. Your client should reuse this header automatically after initialization. +- If you see “Server not initialized,” ensure your client reuses the same `mcp-session-id` for follow-up requests. + ## Features This project supports tools for **all** Cal.com API endpoints by setting the `--all-tools` flags`. It also supports some prompt **workflows** tested in Cursor which allow you to quickstart Cal.com applications. diff --git a/package-lock.json b/package-lock.json index f68eba8..9d74c62 100644 --- a/package-lock.json +++ b/package-lock.json @@ -9,17 +9,21 @@ "version": "0.0.6", "dependencies": { "@buildwithlayer/openapi-to-tools": "1.2.0", - "@modelcontextprotocol/sdk": "^1.11.2" + "@modelcontextprotocol/sdk": "^1.11.2", + "express": "^5.1.0" }, "bin": { "cal-mcp-demo": "dist/index.js" }, "devDependencies": { "@eslint/js": "^9.26.0", + "@types/express": "^5.0.3", "@types/node": "^22.15.19", "eslint": "^9.26.0", "eslint-plugin-jest": "^28.11.0", "eslint-plugin-sort": "^4.0.0", + "ts-node": "^10.9.2", + "tsx": "^4.20.6", "typescript": "^5.5.3", "typescript-eslint": "^8.32.1" } @@ -70,6 +74,434 @@ "node": ">=18" } }, + "node_modules/@cspotcode/source-map-support": { + "version": "0.8.1", + "resolved": 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"optional": true, + "os": [ + "darwin" + ], + "engines": { + "node": "^8.16.0 || ^10.6.0 || >=11.0.0" + } + }, "node_modules/function-bind": { "version": "1.1.2", "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.2.tgz", @@ -1632,6 +2296,18 @@ "node": ">= 0.4" } }, + "node_modules/get-tsconfig": { + "version": "4.12.0", + "resolved": "https://registry.npmjs.org/get-tsconfig/-/get-tsconfig-4.12.0.tgz", + "integrity": "sha512-LScr2aNr2FbjAjZh2C6X6BxRx1/x+aTDExct/xyq2XKbYOiG5c0aK7pMsSuyc0brz3ibr/lbQiHD9jzt4lccJw==", + "dev": true, + "dependencies": { + "resolve-pkg-maps": "^1.0.0" + }, + "funding": { + "url": "https://github.com/privatenumber/get-tsconfig?sponsor=1" + } + }, "node_modules/glob-parent": { "version": "6.0.2", "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-6.0.2.tgz", @@ -1937,6 +2613,12 @@ "dev": true, "license": "MIT" }, + "node_modules/make-error": { + "version": "1.3.6", + "resolved": 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"https://registry.npmjs.org/ts-node/-/ts-node-10.9.2.tgz", + "integrity": "sha512-f0FFpIdcHgn8zcPSbf1dRevwt047YMnaiJM3u2w2RewrB+fob/zePZcrOyQoLMMO7aBIddLcQIEK5dYjkLnGrQ==", + "dev": true, + "dependencies": { + "@cspotcode/source-map-support": "^0.8.0", + "@tsconfig/node10": "^1.0.7", + "@tsconfig/node12": "^1.0.7", + "@tsconfig/node14": "^1.0.0", + "@tsconfig/node16": "^1.0.2", + "acorn": "^8.4.1", + "acorn-walk": "^8.1.1", + "arg": "^4.1.0", + "create-require": "^1.1.0", + "diff": "^4.0.1", + "make-error": "^1.1.1", + "v8-compile-cache-lib": "^3.0.1", + "yn": "3.1.1" + }, + "bin": { + "ts-node": "dist/bin.js", + "ts-node-cwd": "dist/bin-cwd.js", + "ts-node-esm": "dist/bin-esm.js", + "ts-node-script": "dist/bin-script.js", + "ts-node-transpile-only": "dist/bin-transpile.js", + "ts-script": "dist/bin-script-deprecated.js" + }, + "peerDependencies": { + "@swc/core": ">=1.2.50", + "@swc/wasm": ">=1.2.50", + "@types/node": "*", + "typescript": ">=2.7" + }, + "peerDependenciesMeta": { + "@swc/core": { + "optional": true + }, + "@swc/wasm": { + "optional": true + } + } + }, + "node_modules/tsx": { + "version": "4.20.6", + "resolved": "https://registry.npmjs.org/tsx/-/tsx-4.20.6.tgz", + "integrity": "sha512-ytQKuwgmrrkDTFP4LjR0ToE2nqgy886GpvRSpU0JAnrdBYppuY5rLkRUYPU1yCryb24SsKBTL/hlDQAEFVwtZg==", + "dev": true, + "dependencies": { + "esbuild": "~0.25.0", + "get-tsconfig": "^4.7.5" + }, + "bin": { + "tsx": "dist/cli.mjs" + }, + "engines": { + "node": ">=18.0.0" + }, + "optionalDependencies": { + "fsevents": "~2.3.3" + } + }, "node_modules/type-check": { "version": "0.4.0", "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz", @@ -2715,6 +3468,12 @@ "punycode": "^2.1.0" } }, + "node_modules/v8-compile-cache-lib": { + "version": "3.0.1", + "resolved": "https://registry.npmjs.org/v8-compile-cache-lib/-/v8-compile-cache-lib-3.0.1.tgz", + "integrity": "sha512-wa7YjyUGfNZngI/vtK0UHAN+lgDCxBPCylVXGp0zu59Fz5aiGtNXaq3DhIov063MorB+VfufLh3JlF2KdTK3xg==", + "dev": true + }, "node_modules/vary": { "version": "1.1.2", "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz", @@ -2755,6 +3514,15 @@ "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==", "license": "ISC" }, + "node_modules/yn": { + "version": "3.1.1", + "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz", + "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==", + "dev": true, + "engines": { + "node": ">=6" + } + }, "node_modules/yocto-queue": { "version": "0.1.0", "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz", diff --git a/package.json b/package.json index 4584256..42d8b36 100644 --- a/package.json +++ b/package.json @@ -26,18 +26,24 @@ ], "scripts": { "build": "tsc", + "dev": "tsx watch src/mcp.ts", + "start": "npm run build && node dist/mcp.js", "inspect": "npm run build && npx @modelcontextprotocol/inspector node dist/index.js" }, "dependencies": { "@buildwithlayer/openapi-to-tools": "1.2.0", - "@modelcontextprotocol/sdk": "^1.11.2" + "@modelcontextprotocol/sdk": "^1.11.2", + "express": "^5.1.0" }, "devDependencies": { "@eslint/js": "^9.26.0", + "@types/express": "^5.0.3", "@types/node": "^22.15.19", "eslint": "^9.26.0", "eslint-plugin-jest": "^28.11.0", "eslint-plugin-sort": "^4.0.0", + "ts-node": "^10.9.2", + "tsx": "^4.20.6", "typescript": "^5.5.3", "typescript-eslint": "^8.32.1" } diff --git a/src/mcp.ts b/src/mcp.ts new file mode 100644 index 0000000..fae66ee --- /dev/null +++ b/src/mcp.ts @@ -0,0 +1,103 @@ +import addAPITools from "@buildwithlayer/openapi-to-tools/mcp.js"; +import type { APITool } from "@buildwithlayer/openapi-to-tools/types.js"; +import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js"; +import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js"; +import express from "express"; +import { json } from "express"; +import axios from "axios"; +import { randomUUID } from "node:crypto"; +import { config } from "./config.js"; +import { tools } from "./tools.js"; + +const app = express(); +app.use(json({ limit: "4mb" })); + +function buildServer(apiKey: string): McpServer { + const server = new McpServer( + { + name: "cal-com", + version: "1.0.0", + }, + { + capabilities: { + tools: {}, + }, + }, + ); + + let workingTools: APITool[] = tools.map((tool: APITool) => ({ + ...tool, + name: tool.name.split("_").slice(-1)[0], + })); + if (!(process.argv.includes("--all-tools") || process.argv.includes("-a"))) { + workingTools = workingTools.filter((tool) => + config.defaultTools.includes(tool.name), + ); + } + + const bearer = apiKey.startsWith("Bearer ") ? apiKey : `Bearer ${apiKey}`; + addAPITools(server, workingTools as APITool[], { + Authorization: bearer, + }); + return server; +} + +const mcpPath = process.env.MCP_PATH ?? "/mcp"; + +// Attach Authorization from MCP client to outgoing API calls +let currentAuthHeader: string | undefined; +type SessionBundle = { server: McpServer; transport: StreamableHTTPServerTransport }; +const sessions = new Map(); +axios.interceptors.request.use((config) => { + if (!config.headers) config.headers = {} as any; + if (!("authorization" in config.headers) && currentAuthHeader) { + (config.headers as any)["authorization"] = currentAuthHeader; + } + return config; +}); + +app.all(mcpPath, async (req, res) => { + // Capture auth from client request (prefer Authorization, fallback to x-cal-api-key/x-api-key) + const authHeader = (req.headers["authorization"] as string | undefined) + || (req.headers["x-cal-api-key"] as string | undefined) + || (req.headers["x-api-key"] as string | undefined); + if (authHeader && authHeader.length > 0) { + currentAuthHeader = authHeader.startsWith("Bearer ") ? authHeader : `Bearer ${authHeader}`; + } + + // Route by session when provided + const sidHeader = req.headers["mcp-session-id"]; + const sid = typeof sidHeader === "string" ? sidHeader : undefined; + if (sid && sessions.has(sid)) { + const bundle = sessions.get(sid)!; + await bundle.transport.handleRequest(req as any, res as any, (req as any).body); + return; + } + + // No session: initialize a new one; require some form of API key + if (!authHeader) { + res.status(401).json({ error: "Unauthorized" }); + return; + } + + const server = buildServer(currentAuthHeader!); + const transport = new StreamableHTTPServerTransport({ + sessionIdGenerator: () => randomUUID(), + onsessioninitialized: (newSid: string) => { + sessions.set(newSid, { server, transport }); + transport.onclose = () => { + sessions.delete(newSid); + }; + }, + }); + await server.connect(transport); + await transport.handleRequest(req as any, res as any, (req as any).body); +}); + +const port = Number(process.env.PORT ?? 3000); +app.listen(port, () => { + const host = process.env.HOST ?? "localhost"; + console.log(`MCP Streamable HTTP server listening at http://${host}:${port}${mcpPath}`); +}); + +