Email verification add-on plugin for user created with Fluent Form Plugin

ff-user-email-verification.php

<?php
/*
Plugin Name: Fluent Form User Email Verification
Description: Fluent Form User Email Verification
Version: 1.0
Author: WPManageNinja Support Team
Author URI: https://wpmanageninja.com
Plugin URI: https://wpmanageninja.com
License: GPLv2 or later
Text Domain: fluentform
*/


class FluentFormUserApproval
{
    // Just a workaround Can be activated as plugin use inside function.php or any PHP snippet plugin
    // Add your target role and message
    // Do not use the auto login feature of FF Registration Module
    
    private $pending_message = 'You account is not activated yet, check your email !';
    private $check_role = 'editor';
    
    
    public function boot()
    {
        // send email with a activation key
        add_action ( 'fluentform_user_registration_completed', array($this, 'send_email_verification_key'), 11, 4 );
        // check verification link
        add_action ( 'init', array($this, 'verify_user_code') );
        // check un verified user login
        add_filter ( 'wp_authenticate_user', array($this, 'authenticate_user'), 10, 1 );
        
    }
    
    
    public function authenticate_user($userdata)
    {
        
        $current_user = new WP_User( $userdata->ID );
        
        if ( !metadata_exists( 'user', $userdata->ID, 'is_activated_ff' ) ) {
			//The user does not have this meta key so let him login
            return  $userdata;
		}
        
        $stat = (boolean)get_user_meta ( $userdata->ID, 'is_activated_ff', true );
        
        if ( !in_array( $this->check_role, (array) $current_user->roles ) ) {
            //The user does not have this role so let him login
            return  $userdata;
        }
        
        if ($stat == false) {
            
            $message = __ ( '<strong>ERROR</strong>: ' . $this->pending_message . ' ', 'fluent-form' );
            $message = new WP_Error( 'fluent-form', $message );
            
            return $message;
        }
        
        return $userdata;
        
    }
    
    public function send_email_verification_key($userId, $feed, $formData, $form)
    {
        $user_info = get_userdata ( $userId );
        // create md5 code to verify later
        $code = md5 ( time () );
        
        // make it into a code to send it to user via email
        $string = array('id' => $userId, 'code' => $code);
        
        // create the activation code and activation status
        update_user_meta ( $userId, 'is_activated_ff', 0 );
        
        update_user_meta ( $userId, 'activation_code', $code );
        // create the url
        $url = get_site_url () . '/?act=' . base64_encode ( serialize ( $string ) );
        
        $link = 'Please click the following link to activate your account <br/> <a href="' . $url . '">ACTIVATION LINK</a>';
        
        $to      = $user_info->user_email;
        $subject = 'Registration';
        $html    = '<table
        border="0" cellpadding="0" cellspacing="0" width="100%" style="-webkit-text-size-adjust: none; background-color: #ffffff; border: 1px solid #eee; margin-bottom: 25px;">
        <tbody>
        <tr style="-webkit-text-size-adjust: none;">
          <td align="center" valign="top" style="-webkit-text-size-adjust: none;background-color: #fff;padding:20px 20px;margin:0 auto;">
          ' . $link . '
          </td>
        </tr>
        </tbody>
      </table>
      ' . $emailBody;
        
        $headers = array('Content-Type: text/html; charset=UTF-8');
        
        wp_mail ( $to, $subject, $html, $headers );
        
        wp_send_json_success ( [
            'result' => [
                
                'message' => 'Success ! Please check your email ' . $to . ' for activation link.'
            ]
        ] );
        
    }
    
    public function verify_user_code()
    {
        
        if (isset( $_GET['act'] )) {
            
            $data = unserialize ( base64_decode ( $_GET['act'] ) );
            $code = get_user_meta ( $data['id'], 'activation_code', true );
            
            // verify whether the code given is the same as ours
            if ($code == $data['code']) {
                
                // update the user meta
                update_user_meta ( $data['id'], 'is_activated_ff', 1 );
                
                $message = "Account activated! Please login now!";
                echo "<script type='text/javascript'>alert('$message');</script>";
                
            } else {
                
                $message = "Invalid URL";
                echo "<script type='text/javascript'>alert('$message');</script>";
                
            }
            
        }
    }
    
}

add_action ( 'plugins_loaded', function () {
    (new FluentFormUserApproval())->boot ();
} );