How to use and decode state parameter

[eric72]

I added in my app the state parameter like that:
constructor() {
super({
clientID: GOOGLE_CLIENT_ID,
clientSecret: GOOGLE_SECRET,
callbackURL: 'my callback url',
state: JSON.stringify({ "redirectUrl" : "test" }),
scope: ['email', 'profile'],
});
}

now when i get it from my request i get my state encoded.
I try to decode it and get my : { "redirectUrl" : "test" } .
But it's not working.
How can i get it ?
I already tried this :
Buffer.from(req.query.state, 'base64').toString('ascii');
Buffer.from(req.query.state).toString('utf-8'));
Buffer.from(req.query.state).toString('ascii'));

But i can't decode it and get my : { "redirectUrl" : "test" } .
Is it possible to get it ?

Thanks,

[adrianotadao]

hey @eric72 how did you make it work?

[eric72]

I didn't used it at the end for the moment, did you resolved the same issue ?

[adrianotadao]

hm it worked for me:

const authUser = async (
  req: Request,
  _accessToken: unknown,
  _refreshToken: unknown,
  authProfile: unknown,
): Promise<void> => {
  JSON.parse(req.query.state)
};

passport.use(new PassportGoogle.Strategy(
  {
    clientID: params.clientId,
    clientSecret: params.clientSecret,
    callbackURL: '/users/auth/google/callback',
    scope: ['profile', 'email'],
    passReqToCallback: true,
  }, authUser),
);

router.get('/auth/google', (req, res, next) => {
  const state = JSON.stringify(parsedSchema.data);
  passport.authenticate('google', { state })(req, res, next);
});

router.get('/auth/google/callback', (req, res, next) => {
  passport.authenticate('google', { authInfo: true }, async (err, args: OauthPayload) => {
    console.log(args.state.origin);
  })(req, res, next);
});

[louisnk]

This fails in Typescript as state is not a defined parameter of the AuthenticateOptions interface. Seems like a similar issue to fastify/fastify-passport#51