@modelcontextprotocol/sdk
Version:
Model Context Protocol implementation for TypeScript
56 lines • 2.66 kB
JavaScript
import { InsufficientScopeError, InvalidTokenError, OAuthError, ServerError } from "../errors.js";
/**
* Middleware that requires a valid Bearer token in the Authorization header.
*
* This will validate the token with the auth provider and add the resulting auth info to the request object.
*/
export function requireBearerAuth({ provider, requiredScopes = [] }) {
return async (req, res, next) => {
try {
const authHeader = req.headers.authorization;
if (!authHeader) {
throw new InvalidTokenError("Missing Authorization header");
}
const [type, token] = authHeader.split(' ');
if (type.toLowerCase() !== 'bearer' || !token) {
throw new InvalidTokenError("Invalid Authorization header format, expected 'Bearer TOKEN'");
}
const authInfo = await provider.verifyAccessToken(token);
// Check if token has the required scopes (if any)
if (requiredScopes.length > 0) {
const hasAllScopes = requiredScopes.every(scope => authInfo.scopes.includes(scope));
if (!hasAllScopes) {
throw new InsufficientScopeError("Insufficient scope");
}
}
// Check if the token is expired
if (!!authInfo.expiresAt && authInfo.expiresAt < Date.now() / 1000) {
throw new InvalidTokenError("Token has expired");
}
req.auth = authInfo;
next();
}
catch (error) {
if (error instanceof InvalidTokenError) {
res.set("WWW-Authenticate", `Bearer error="${error.errorCode}", error_description="${error.message}"`);
res.status(401).json(error.toResponseObject());
}
else if (error instanceof InsufficientScopeError) {
res.set("WWW-Authenticate", `Bearer error="${error.errorCode}", error_description="${error.message}"`);
res.status(403).json(error.toResponseObject());
}
else if (error instanceof ServerError) {
res.status(500).json(error.toResponseObject());
}
else if (error instanceof OAuthError) {
res.status(400).json(error.toResponseObject());
}
else {
console.error("Unexpected error authenticating bearer token:", error);
const serverError = new ServerError("Internal Server Error");
res.status(500).json(serverError.toResponseObject());
}
}
};
}
//# sourceMappingURL=bearerAuth.js.map