Dynamic authorizationParameters

[cristianbriscaru]

Checklist

• I have looked into the Readme, Examples, and FAQ and have not found a suitable solution or answer.
• I have looked into the API documentation and have not found a suitable solution or answer.
• I have searched the issues and have not found a suitable solution or answer.
• I have searched the Auth0 Community forums and have not found a suitable solution or answer.
• I agree to the terms within the Auth0 Code of Conduct.

Describe the problem you'd like to have solved

Currently we are passing the authorizationParameters when instantiating the Auth0Client which is a 'singleton' leaving us with no way to pass dynamic authorizationParameters.
I have a use case where in some instances we want to redirect a user directly to the signup page, we use Classic Login and we want to pass an extra authorization param 'action':'signup' and we added custom code in auth0 Classic Login initialScreen: config.extraParams.action === "signup" ? "signUp" : "login", but because we can't pass dynamic authorizationParameters we have no way of doing this.
Any ideea how we can accomplish this ?

Describe the ideal solution

To have a way to dynamically pass authorizationParameters when using auth0Client.middleware(request);

Alternatives and current workarounds

No viable workaround available, only way to do it is to create a new Auth0Client for each request which is not feasible

export const auth0 = new Auth0Client(getAuth0ClientConfig());

const signupAuth0 = new Auth0Client(getAuth0ClientConfig('signup'));

export const auth0Middleware = (request: NextRequest) => {
  let auth0Client = auth0;

  if(request.nextUrl.searchParams.has("action", "signup")){
    auth0Client = signupAuth0;
  }

  return auth0Client.middleware(request);
}

function getAuth0ClientConfig(authorizationParametersAction?: string): Auth0ClientOptions {
  return {
    domain: process.env.AUTH0_DOMAIN,
    clientId: process.env.AUTH0_CLIENT_ID,
    clientSecret: process.env.AUTH0_CLIENT_SECRET,
    appBaseUrl: process.env.NEXT_PUBLIC_APP_BASE_URL,
    secret: process.env.AUTH0_SECRET,
    authorizationParameters: {
      action: authorizationParametersAction,
      audience: process.env.AUTH0_AUDIENCE,
    }
  }
}

Additional context

No response

[guabu]

Hey @cristianbriscaru 👋 Passing the action in the query parameter to the /auth/login endpoint from the client will cause the parameter to be forwarded to the authorize endpoint. This is documented here: https://github.com/auth0/nextjs-auth0/blob/main/EXAMPLES.md#passing-authorization-parameters

For example, redirecting the user to: /auth/login?action=signup will result in action=signup being sent to the /authorize endpoint.