Obtain your access token from auth0

Currently, my setup involves utilizing auth0 and nextJS.

My objective is to have the user redirected to the callback API after successfully logging in with their credentials.

Here is the snippet of code I am working with:

    import auth0 from '../../utils/auth0';

    export default async function callback(req, res) {
      try {
        await auth0.handleCallback(req, res, {
          redirectTo: '/'
        });
      } catch (error) {
        console.error(error);
        res.status(error.status || 400).end(error.message);
      }
    }

I aim to redirect users based on the decoded token information. By decoding the token, I can determine if the user is either a regular user or an admin.

If the user is an admin, they should be directed to the admin page; otherwise, they should be directed to the user page.

To implement this functionality, I made some modifications:

    import auth0 from '../../utils/auth0';

    export default async function callback(req, res) {
       const tokenCache = auth0.tokenCache(req, res);
       const { accessToken } = await tokenCache.getAccessToken();
       console.log(accessToken) 
      try {
        await auth0.handleCallback(req, res, { redirectTo: '/' });
      } catch (error) {
        console.error(error);
        res.status(error.status || 400).end(error.message);
      }
    }

My goal is to obtain the token within this function to enable user redirection to different pages. However, when attempting to retrieve the token within the function, I encounter the following issue:

The user does not have a valid session.

If I remove the token-related code, the user is redirected successfully. Nevertheless, it is essential for me to access the token within this callback function to perform user checks as described above.

How can I retrieve the token inside the callback function while achieving the desired behavior?

Answer №1

If you are using version 1.2.0 of the nextjs-auth0 library, you can retrieve the identity token within the callback handler.

import { handleAuth, handleLogin, handleCallback } from '@auth0/nextjs-auth0';

const afterCallback = (req, res, session, state) => {
    console.log(session.idToken);
    if (!session.user.isAdmin) {
        throw new UnauthorizedError('User is not admin');
    }
    return session;
}

export default handleAuth({
    async callback(req, res) {
        try {
            await handleCallback(req, res, { afterCallback });
        } catch (error) {
            res.status(error.status || 500).end(error.message);
        }
    }
});

https://i.stack.imgur.com/Mj9KV.png

Please note that it is recommended to avoid inspecting the contents of the access token in your client application. If you need to pass user information to the client, it should be done through an id_token instead. Access tokens are intended for use by APIs, and your client application should not rely on their specific format or content as they do not have a standardized structure.

Answer №2

const handleAuthCallback = async (
  request: NextApiRequest,
  response: NextApiResponse
) => {
  try {
    await auth0.handleCallback(request, response, {
      async postCallback(request, response, sessionData, state) {
        return sessionData;
      },
    });
  } catch (err) {
    response.status(err.statusCode || 500).end(err.message);
  }
}

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