wordpress get token by email JWT

token_by_email_JWT.php

<?php
use \Firebase\JWT\JWT;

function social_token($request)
    {
    	$user_name	=	$request['email'];
		if( email_exists( $user_name ) == true )
		{
			
		
        $secret_key = defined('JWT_AUTH_SECRET_KEY') ? JWT_AUTH_SECRET_KEY : false;
        
        /** First thing, check the secret key if not exist return a error*/
        if (!$secret_key) {
            return new WP_Error(
                'jwt_auth_bad_config',
                __('JWT is not configurated properly, please contact the admin', 'wp-api-jwt-auth'),
                array(
                    'status' => 403,
                )
            );
        }
        /** Try to authenticate the user with the passed credentials*/
        $user = get_user_by( 'email', $user_name );
        /** If the authentication fails return a error*/
        if (is_wp_error($user)) {
            $error_code = $user->get_error_code();
            return new WP_Error(
                '[jwt_auth] '.$error_code,
                $user->get_error_message($error_code),
                array(
                    'status' => 403,
                )
            );
        }
        /** Valid credentials, the user exists create the according Token */
        $issuedAt = time();
        $notBefore = apply_filters('jwt_auth_not_before', $issuedAt, $issuedAt);
        $expire = apply_filters('jwt_auth_expire', $issuedAt + (DAY_IN_SECONDS * 7), $issuedAt);
        $token = array(
            'iss' => get_bloginfo('url'),
            'iat' => $issuedAt,
            'nbf' => $notBefore,
            'exp' => $expire,
            'data' => array(
                'user' => array(
                    'id' => $user->data->ID,
                ),
            ),
        );
        /** Let the user modify the token data before the sign. */
        $token = JWT::encode(apply_filters('jwt_auth_token_before_sign', $token, $user), $secret_key);
        /** The token is signed, now create the object with no sensible user data to the client*/
        $data = array(
            'token' => $token,
            'user_email' => $user->data->user_email,
            'user_nicename' => $user->data->user_nicename,
            'user_display_name' => $user->data->display_name,
        );
        /** Let the user modify the data before send it back */
        return $data;
    }
}