Firebase Functions Express API

index.ts

import * as express from 'express';
import * as cors from 'cors';
import * as bodyParser from 'body-parser';
import * as sentry from '@sentry/node';
import * as admin from 'firebase-admin';
import { APIResponse } from '@sredmond/apiresponse';
import * as functions from 'firebase-functions';

const app = express();

const options: cors.CorsOptions = {
  origin: true
};

/**
 * Setup App
 */
app.use(cors(options));
app.disable('x-powered-by');
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

/**********************************************************************************
 * MAIN FUNCTION - Verifies that user has the correct access rights to make calls *
 **********************************************************************************/
app.use('/v1', async (req: express.Request, res: express.Response, next: express.NextFunction) => {
  try {
    let token: string = '';

    if (req.headers.authorization && req.headers.authorization.toString().startsWith('Bearer ')) {
      token = req.headers.authorization.toString().split('Bearer ')[1];
      sentry.addBreadcrumb({ message: 'Got Token From Request', data: token });
    } else {
      return new APIResponse({ success: false, status: 401 }).Send(res);
    }

    //Decode the token user's firebase ID
    const decodedToken = await admin
      .auth()
      .verifyIdToken(token)
      .catch(err => new APIResponse({ success: false, status: 401 }).Send(res));

    sentry.addBreadcrumb({ message: 'Decoded Token', data: decodedToken });

    //Check the token exists
    if (decodedToken) {
      req['user'] = decodedToken;
      sentry.addBreadcrumb({ message: 'API - User', data: req['user'] });
      const uid = decodedToken['user_id'];
      if (!uid) {
        return new APIResponse({ success: false, status: 401 }).Send(res);
      }
      //Expression has type void put it on its own line
      next();
      return null;
    } else {
      return new APIResponse({ success: false, status: 401 }).Send(res);
    }
  } catch (e) {
    return new APIResponse({ success: false, body: e, status: 500 }).Send(res);
  }
});

// You can use your custom express router like normal
import { myRouter } from './someroute';
app.use('/myroute', myRouter);

/*************************************
 * Main function to use the redirect *
 *************************************/
const main = express();
main.use('/api', app);

/***********************
 *     Export API      *
 ***********************/
export const API = functions.https.onRequest(main);

someroute.ts

import * as express from 'express';

const myRouter = express.Router();

// set up your router how you would normally