Generate JWT Token without username and password

For the developers who are facing the similar issue here is what I have done to achieve the desired results.

The best way would be to develop the functionality from scratch but due to a tight deadline I opted to modify the JWT Auth Plugin

I have modified the method get_token in the file class-auth.php. What I have done is that at first the method was looking for params username and password and I have modified it to receive userID as the param required. Why userID ? It is because I am running a cURL call to get the user data after the user sign in. Here is the code for the get_token method if anyone wants to use it. Although it was a small modification but it produces the required results. Thank you all for the suggestions. Happy Coding

public function get_token(WP_REST_Request $request)
    {
        $secret_key = defined('JWT_AUTH_SECRET_KEY') ? JWT_AUTH_SECRET_KEY : false;

        $userID = $request->get_param('user_id');
        $custom_auth = $request->get_param('custom_auth');

        // First thing, check the secret key if not exist return a error.
        if (!$secret_key) {
            return new WP_REST_Response(
                array(
                    'success' => false,
                    'statusCode' => 403,
                    'code' => 'jwt_auth_bad_config',
                    'message' => __('JWT is not configurated properly.', 'jwt-auth'),
                    'data' => array(),
                )
            );
        }

        // Getting data for the logged in user.
        $user = get_user_by('id', $userID);

        // If the authentication is failed return error response.
        if (!$user) {
            // $error_code = $user->get_error_code();

            return new WP_REST_Response(
                array(
                    'success' => false,
                    'statusCode' => 403,
                    'code' => 404,
                    'message' => 'User does not exists.',
                    'data' => array(),
                )
            );
        }

        return $this->generate_token($user, false);
    }