Checkpoint weaving frontend and backend MFA

backend/src/middleware/index.ts

@@ -1,4 +1,5 @@
 import requireAuth from './requireAuth';
+import requireMfaAuth from './requireMfaAuth';
 import requireBotAuth from './requireBotAuth';
 import requireSignupAuth from './requireSignupAuth';
 import requireWorkspaceAuth from './requireWorkspaceAuth';
@@ -15,6 +16,7 @@ import validateRequest from './validateRequest';
 
 export {
 	requireAuth,
+	requireMfaAuth,
 	requireBotAuth,
 	requireSignupAuth,
 	requireWorkspaceAuth,

backend/src/middleware/requireMfaAuth.ts

@@ -0,0 +1,43 @@
+import jwt from 'jsonwebtoken';
+import { Request, Response, NextFunction } from 'express';
+import { User } from '../models';
+import { JWT_MFA_SECRET } from '../config';
+import { BadRequestError, UnauthorizedRequestError } from '../utils/errors';
+
+declare module 'jsonwebtoken' {
+	export interface UserIDJwtPayload extends jwt.JwtPayload {
+		userId: string;
+	}
+}
+
+/**
+ * Validate if (MFA) JWT temporary token on request is valid (e.g. not expired)
+ * and if there is an associated user.
+ */
+const requireMfaAuth = async (
+	req: Request,
+	res: Response,
+	next: NextFunction
+) => {
+	// JWT (temporary) authentication middleware for complete signup
+	const [ AUTH_TOKEN_TYPE, AUTH_TOKEN_VALUE ] = <[string, string]>req.headers['authorization']?.split(' ', 2) ?? [null, null]
+	if(AUTH_TOKEN_TYPE === null) return next(BadRequestError({message: `Missing Authorization Header in the request header.`}))
+	if(AUTH_TOKEN_TYPE.toLowerCase() !== 'bearer') return next(BadRequestError({message: `The provided authentication type '${AUTH_TOKEN_TYPE}' is not supported.`}))
+	if(AUTH_TOKEN_VALUE === null) return next(BadRequestError({message: 'Missing Authorization Body in the request header'}))
+	
+	const decodedToken = <jwt.UserIDJwtPayload>(
+		jwt.verify(AUTH_TOKEN_VALUE, JWT_MFA_SECRET)
+	);
+
+	const user = await User.findOne({
+		_id: decodedToken.userId
+	}).select('+publicKey');
+
+	if (!user)
+		return next(UnauthorizedRequestError({message: 'Unable to authenticate for User account completion. Try logging in again'}))
+
+	req.user = user;
+	return next();
+};
+
+export default requireMfaAuth;