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August 3, 2018 06:39
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/** | |
* Copyright 2016 Google Inc. All Rights Reserved. | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
*/ | |
'use strict'; | |
const functions = require('firebase-functions'); | |
const admin = require('firebase-admin'); | |
admin.initializeApp(); | |
const express = require('express'); | |
const cookieParser = require('cookie-parser')(); | |
const cors = require('cors')({origin: true}); | |
const app = express(); | |
// Express middleware that validates Firebase ID Tokens passed in the Authorization HTTP header. | |
// The Firebase ID token needs to be passed as a Bearer token in the Authorization HTTP header like this: | |
// `Authorization: Bearer <Firebase ID Token>`. | |
// when decoded successfully, the ID Token content will be added as `req.user`. | |
const validateFirebaseIdToken = (req, res, next) => { | |
console.log('Check if request is authorized with Firebase ID token'); | |
if ((!req.headers.authorization || !req.headers.authorization.startsWith('Bearer ')) && | |
!(req.cookies && req.cookies.__session)) { | |
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>', | |
'or by passing a "__session" cookie.'); | |
res.status(403).send('Unauthorized'); | |
return; | |
} | |
let idToken; | |
if (req.headers.authorization && req.headers.authorization.startsWith('Bearer ')) { | |
console.log('Found "Authorization" header'); | |
// Read the ID Token from the Authorization header. | |
idToken = req.headers.authorization.split('Bearer ')[1]; | |
} else if(req.cookies) { | |
console.log('Found "__session" cookie'); | |
// Read the ID Token from cookie. | |
idToken = req.cookies.__session; | |
} else { | |
// No cookie | |
res.status(403).send('Unauthorized'); | |
return; | |
} | |
admin.auth().verifyIdToken(idToken).then((decodedIdToken) => { | |
console.log('ID Token correctly decoded', decodedIdToken); | |
req.user = decodedIdToken; | |
return next(); | |
}).catch((error) => { | |
console.error('Error while verifying Firebase ID token:', error); | |
res.status(403).send('Unauthorized'); | |
}); | |
}; | |
app.use(cors); | |
app.use(cookieParser); | |
app.use(validateFirebaseIdToken); | |
app.get('/hello', (req, res) => { | |
res.send(`Hello ${req.user.name}`); | |
}); | |
// 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.app = functions.https.onRequest(app); |
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