cx-newsletter/components/13-mail_manager.php

<?php

namespace cx_newsletter;
use \Exception;
use \wp_mail;

class mail_manager 
extends use_settings {
    public function prepare(single_mail $target) : void {
        if ($target->reply_to === null) {
            $target->reply_to = $this->get_settings()->get('reply_to_address');
        }
    
        if (!$target->is_good()) {
            throw new Exception($target->validate());
        }

        $this->target = $target;
    }

    public function send(bool $debug = false) : bool {
        if ($this->target === null) {
            return false;
        }

        if (!$this->get_settings()->use_custom_smtp()) {
            return $this->send_by_wp_mail();
        }
        
        if ($debug) {
            $this->send_by_phpmailer();
            return true;
        }
        
        try {
            $this->send_by_phpmailer($debug);
        } catch (Exception $exception) {
            return false;
        }
        
        return true;
    }

    private function send_by_phpmailer(bool $debug = false) : void {
        if (!class_exists('\PHPMailer\PHPMailer\PHPMailer')) {
            use_php_mailer();
        }

        $mailer = new \PHPMailer\PHPMailer\PHPMailer(true);

        if ($debug) {
            $mailer->SMTPDebug = \PHPMailer\PHPMailer\SMTP::DEBUG_SERVER;
        } else {
            $mailer->SMTPDebug = \PHPMailer\PHPMailer\SMTP::DEBUG_OFF;
        }

        $mailer->SMTPSecure = \PHPMailer\PHPMailer\PHPMailer::ENCRYPTION_SMTPS; 
        $mailer->isSMTP();
        $mailer->Host = $this->get_settings()->get('smtp_address');
        $mailer->Port = intval($this->get_settings()->get('smtp_port'));
        $mailer->SMTPAuth = true;
        $mailer->Username = $this->get_settings()->get('smtp_user');
        $mailer->Password = $this->get_settings()->get('smtp_password');
        $mailer->addAddress($this->target->to);
        $mailer->addReplyTo($this->target->reply_to);
        $mailer->setFrom($this->get_settings()->get('source_address'));
        $mailer->Subject = $this->target->title;
        $mailer->Body = $this->target->content;

        if ($this->target->is_html) {
            $mailer->AltBody = strip_tags($this->target->content);
        } else {
            $mailer->AltBody = $this->target->content;
        }

        $mailer->send();
    }

    private function send_by_wp_mail() : bool{
        $headers = $this->target->headers;
        $headers['From'] = $this->get_settings()->get('source_address');
        $headers['Reply-To'] = $this->target->reply_to;

        if ($this->target->is_html) {
            $headers['Content-Type'] = 'text/html';
        } else {
            $headers['Content-Type'] = 'text/plain';
        }

        return wp_mail(
            $this->target->to,
            $this->target->title,
            $this->target->content,
            $headers
        );
    }

    private ?single_mail $target = null;
}