@modelcontextprotocol/sdk
Version:
Model Context Protocol implementation for TypeScript
59 lines • 2.63 kB
JavaScript
import express from 'express';
import cors from 'cors';
import { authenticateClient } from '../middleware/clientAuth.js';
import { OAuthTokenRevocationRequestSchema } from '../../../shared/auth.js';
import { rateLimit } from 'express-rate-limit';
import { allowedMethods } from '../middleware/allowedMethods.js';
import { InvalidRequestError, ServerError, TooManyRequestsError, OAuthError } from '../errors.js';
export function revocationHandler({ provider, rateLimit: rateLimitConfig }) {
if (!provider.revokeToken) {
throw new Error('Auth provider does not support revoking tokens');
}
// Nested router so we can configure middleware and restrict HTTP method
const router = express.Router();
// Configure CORS to allow any origin, to make accessible to web-based MCP clients
router.use(cors());
router.use(allowedMethods(['POST']));
router.use(express.urlencoded({ extended: false }));
// Apply rate limiting unless explicitly disabled
if (rateLimitConfig !== false) {
router.use(rateLimit({
windowMs: 15 * 60 * 1000, // 15 minutes
max: 50, // 50 requests per windowMs
standardHeaders: true,
legacyHeaders: false,
message: new TooManyRequestsError('You have exceeded the rate limit for token revocation requests').toResponseObject(),
...rateLimitConfig
}));
}
// Authenticate and extract client details
router.use(authenticateClient({ clientsStore: provider.clientsStore }));
router.post('/', async (req, res) => {
res.setHeader('Cache-Control', 'no-store');
try {
const parseResult = OAuthTokenRevocationRequestSchema.safeParse(req.body);
if (!parseResult.success) {
throw new InvalidRequestError(parseResult.error.message);
}
const client = req.client;
if (!client) {
// This should never happen
throw new ServerError('Internal Server Error');
}
await provider.revokeToken(client, parseResult.data);
res.status(200).json({});
}
catch (error) {
if (error instanceof OAuthError) {
const status = error instanceof ServerError ? 500 : 400;
res.status(status).json(error.toResponseObject());
}
else {
const serverError = new ServerError('Internal Server Error');
res.status(500).json(serverError.toResponseObject());
}
}
});
return router;
}
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