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import * as functions from 'firebase-functions';
import * as express from 'express';
import * as admin from 'firebase-admin';
import * as cors from 'cors';
import { JwtGenerator } from 'virgil-sdk';
import { VirgilCrypto, VirgilAccessTokenSigner } from 'virgil-crypto';
const app = express();
interface IRequestWithFirebaseUser extends express.Request {
user: admin.auth.DecodedIdToken;
const validateFirebaseIdToken = (req: IRequestWithFirebaseUser, res: express.Response, next: express.NextFunction) => {
console.log('Check if request is authorized with Firebase ID token');
if ((!req.headers.authorization || !req.headers.authorization.startsWith('Bearer '))) {
console.error('No Firebase ID token was passed as a Bearer token in the Authorization header.',
'Make sure you authorize your request by providing the following HTTP header:',
'Authorization: Bearer <Firebase ID Token>');
const idToken = req.headers.authorization.split('Bearer ')[1];
console.log('id token', idToken)
admin.auth().verifyIdToken(idToken).then((decodedIdToken) => {
console.log('ID Token correctly decoded', decodedIdToken);
req.user = decodedIdToken;
}).catch((error) => {
console.error('Error while verifying Firebase ID token:', error);
const crypto = new VirgilCrypto();
const { appid, apikeyid, apiprivatekey } = functions.config().virgil;
const generator = new JwtGenerator({
appId: appid,
apiKeyId: apikeyid,
apiKey: crypto.importPrivateKey(apiprivatekey),
accessTokenSigner: new VirgilAccessTokenSigner(crypto)
app.use(cors({ origin: true, methods: 'OPTIONS,POST', }));
app.get('/virgil-jwt', (req: IRequestWithFirebaseUser, res: express.Response) => {
// You can use, req.user.phone_number or any unique value for identity
const identity = req.user.uid;
const virgilJwtToken = generator.generateToken(identity);
res.json({ token: virgilJwtToken.toString() });
// This HTTPS endpoint can only be accessed by your Firebase Users.
// Requests need to be authorized by providing an `Authorization` HTTP header
// with value `Bearer <Firebase ID Token>`.
exports.api = functions.https.onRequest(app);