I am currently working on implementing a button on my website that allows users to authorize access to their YouTube account. I am utilizing Passport for authentication, and my code involves using fetch to send the request. However, when I click on the button, I encounter the following error:
Access to fetch at 'https://accounts.google.com/o/oauth2/auth?access_type=offline&approval_prompt=force&response_type=code&redirect_uri=http%3A%2F%2Flocalhost%3A3000%2Fgooglecb&scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fyoutube&client_id=...' (redirected from 'http://localhost:3000/google') from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
If I use an href to /google it works.
This is what my app.js file looks like:
const appConfig = require('./config.js');
const cors = require('cors')
const express = require('express');
const passport = require('passport');
const path = require('path');
const YoutubeV3Strategy = require('passport-youtube-v3').Strategy;
const index = require('./routes/index');
const app = express();
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.use(cors());
app.use(passport.initialize());
app.use(passport.session());
passport.use(new YoutubeV3Strategy({
clientID: appConfig.youtube.id,
clientSecret: appConfig.youtube.secret,
callbackURL: 'http://localhost:3000/googlecb',
scope: ['https://www.googleapis.com/auth/youtube'],
},
function (accessToken, refreshToken, profile, cb) {
const user = {
accessToken: accessToken,
refreshToken: refreshToken,
profile: profile,
};
return cb(null, user);
}));
passport.serializeUser((user, cb) => {
cb(null, user);
});
passport.deserializeUser((obj, cb) => {
cb(null, obj);
});
app.use('/', index);
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
next(err);
});
app.use(function(err, req, res, next) {
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
res.status(err.status || 500);
res.render('error');
});
module.exports = app;
In addition, here is how my index.js file is structured:
const express = require('express');
const passport = require('passport');
const router = express.Router();
router.get('/', function(req, res, next) {
res.render('index');
});
router.get('/google', async (req, res) => {
passport.authenticate('youtube')(req, res, () => res.send('ok'));
});
router.get('/googlecb', passport.authenticate('youtube'), async (req, res) => {
const name = req.user.profile.displayName;
console.log('googlecb name: ' + name);
return res.send(req.user);
});
module.exports = router;
Lastly, this is the content of my index.ejs file:
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<p><button id="auth" onclick="go()">Authorize</button><p>
<p><a href="/google">Authorize</a><p>
<script>
async function go() {
console.log('go');
await fetch('/google',
{
method: 'GET',
headers: {
'Content-Type': 'application/json',
},
},
)
.then(response => {
console.log('response');
return response.json();
})
.then(data => {
console.log('data');
});
}
</script>
</body>
</html>