Umbra-Bookshelf/Old/bd-simpleemail/inc/class-email-sender.php

<?php
/**
 * Email Sender Class
 */

if (!defined('ABSPATH')) {
    exit;
}

class BD_Email_Sender {
    public static function send_newsletter($subject, $content) {
        $settings = BD_SimpleEmail::get_settings();
        
        if (empty($settings['gmail_address']) || empty($settings['gmail_password'])) {
            return array(
                'success' => false,
                'message' => __('Gmail not configured', 'bd-simpleemail'),
            );
        }

        $subscribers = BD_SimpleEmail::get_subscribers();
        
        if (empty($subscribers)) {
            return array(
                'success' => false,
                'message' => __('No subscribers found', 'bd-simpleemail'),
            );
        }

        $business = BD_SimpleEmail::get_business_info();
        
        $html = self::build_email_html($subject, $content, $business);
        
        $sent = 0;
        
        foreach ($subscribers as $subscriber) {
            $result = self::send_email(
                $subscriber->email,
                $subject,
                $html,
                $subscriber->unsubscribe_token
            );
            
            if ($result) {
                $sent++;
            }
        }

        return array(
            'success' => true,
            'count' => $sent,
        );
    }

    private static function send_email($to, $subject, $html, $unsubscribe_token = '') {
        $settings = BD_SimpleEmail::get_settings();
        
        $headers = array(
            'Content-Type: text/html; charset=UTF-8',
            'From: ' . $settings['sender_name'] . ' <' . $settings['gmail_address'] . '>',
        );

        if (!empty($settings['reply_to'])) {
            $headers[] = 'Reply-To: ' . $settings['reply_to'];
        }

        $headers[] = 'MIME-Version: 1.0';

        return wp_mail($to, $subject, $html, $headers);
    }

    private static function build_email_html($subject, $content, $business) {
        $site_url = get_bloginfo('url');
        $site_name = get_bloginfo('name');

        $unsubscribe_link = add_query_arg(array(
            'unsubscribe' => '{{email}}',
            'token' => '{{token}}',
        ), home_url('/unsubscribe/'));

        $address_html = '';
        if ($business['name']) {
            $address_html = '<p>' . esc_html($business['name']) . '<br>';
            if ($business['address_1']) {
                $address_html .= esc_html($business['address_1']) . '<br>';
            }
            if ($business['address_2']) {
                $address_html .= esc_html($business['address_2']) . '<br>';
            }
            if ($business['city']) {
                $address_html .= esc_html($business['city']) . '<br>';
            }
            if ($business['country']) {
                $address_html .= esc_html($business['country']);
            }
            $address_html .= '</p>';
        }

        $html = '
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>' . esc_html($subject) . '</title>
    <style>
        body { margin: 0; padding: 0; font-family: Georgia, serif; font-size: 16px; line-height: 1.6; color: #2C2C2C; background-color: #F5F0E8; }
        .email-container { max-width: 600px; margin: 0 auto; background-color: #ffffff; }
        .email-header { background-color: #1B3A6B; padding: 30px; text-align: center; }
        .email-header h1 { color: #C8A96E; margin: 0; font-size: 28px; }
        .email-body { padding: 30px; }
        .email-footer { background-color: #EDE4D0; padding: 20px 30px; text-align: center; font-size: 12px; color: #555555; }
        a { color: #2E6DA4; }
        .unsubscribe-link { color: #888888; text-decoration: underline; }
    </style>
</head>
<body>
    <div class="email-container">
        <div class="email-header">
            <h1>' . esc_html($site_name) . '</h1>
        </div>
        <div class="email-body">
            ' . $content . '
        </div>
        <div class="email-footer">
            <p>
                <a href="' . esc_url($site_url) . '">' . esc_html($site_url) . '</a>
            </p>
            ' . $address_html . '
            <p>
                <a href="' . esc_url($unsubscribe_link) . '">Unsubscribe</a> from this mailing list.
            </p>
            <p>You received this email because you signed up for updates from ' . esc_html($site_name) . '.</p>
        </div>
    </div>
</body>
</html>
        ';

        return $html;
    }

    public static function encrypt_password($password) {
        $key = defined('AUTH_KEY') ? AUTH_KEY : 'bdm_email_secret';
        $iv = openssl_random_pseudo_bytes(16);
        
        $encrypted = openssl_encrypt($password, 'AES-256-CBC', $key, 0, $iv);
        
        return base64_encode($iv . $encrypted);
    }

    public static function decrypt_password($encrypted) {
        $data = base64_decode($encrypted);
        
        $key = defined('AUTH_KEY') ? AUTH_KEY : 'bdm_email_secret';
        
        $iv = substr($data, 0, 16);
        $ciphertext = substr($data, 16);
        
        return openssl_decrypt($ciphertext, 'AES-256-CBC', $key, 0, $iv);
    }
}