phpmailer/includes/functions.custom.php

<?php
defined('CON_FRAMEWORK') || die('Illegal call: Missing framework initialization - request aborted.');

use Greew\OAuth2\Client\Provider\Azure;
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\OAuth;
use PHPMailer\PHPMailer\Exception;

/**
 * @param bool|null $exception
 * @return PHPMailer
 * @throws Exception
 */
function initPHPMailer(bool $exception = null): PHPMailer
{
    if(cFileHandler::exists(cRegistry::getClientConfig(1)['config']['path'] . 'config.phpmailer.php')) {
        $config = parse_ini_file(cRegistry::getClientConfig(1)['config']['path'] . 'config.phpmailer.php', true);
    } else if (cFileHandler::exists(cRegistry::getConfigValue('path', 'config') . 'config.phpmailer.php')) {
        $config = parse_ini_file(cRegistry::getConfigValue('path', 'config') . 'config.phpmailer.php', true);
    } else {
        throw new Exception("SMTP config not found!");
    }

    $mailer = new PHPMailer($exception);

    //Enable SMTP debugging
    //SMTP::DEBUG_OFF = off (for production use)
    //SMTP::DEBUG_CLIENT = client messages
    //SMTP::DEBUG_SERVER = client and server messages
    $mailer->SMTPDebug = SMTP::DEBUG_OFF;

    //Tell PHPMailer to use SMTP
    $mailer->isSMTP();

    //Set the hostname of the mail server
    $mailer->Host = $config['smtp']['host'];

    //Set the SMTP port number:
    // - 465 for SMTP with implicit TLS, a.k.a. RFC8314 SMTPS or
    // - 587 for SMTP+STARTTLS
    $mailer->Port = $config['smtp']['port'];

    //Set the encryption mechanism to use:
    // - SMTPS (implicit TLS on port 465) or
    // - STARTTLS (explicit TLS on port 587)
    $mailer->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;

    //Whether to use SMTP authentication
    $mailer->SMTPAuth = true;

    //Set AuthType to use XOAUTH2
    $mailer->AuthType = 'XOAUTH2';

    //Create a new OAuth2 provider instance
    $provider = new Azure(
        [
            'clientId' => $config['smtp']['clientId'],
            'clientSecret' => $config['smtp']['clientSecret'],
            'tenantId' => $config['smtp']['tenantId'],
        ]
    );

//Pass the OAuth provider instance to PHPMailer
    $mailer->setOAuth(
        new OAuth(
            [
                'provider' => $provider,
                'clientId' => $config['smtp']['clientId'],
                'clientSecret' => $config['smtp']['clientSecret'],
                'refreshToken' => $config['smtp']['refreshToken'],
                'userName' => $config['smtp']['email'],
            ]
        )
    );

    $mailer->From = $config['smtp']['email'];
    
    return $mailer;
}

/**
 * @param string $html
 * @param string $subject
 * @param array $recipients
 * @param array $attachments
 * @param string $fromEmail
 * @param string $fromName
 * @return bool
 * @throws Exception
 * @throws cDbException
 * @throws cException
 * @throws phpmailerException
 */
function enwiSendMailSmtp(string $html, string $subject, array $recipients, array $attachments, string $fromEmail = '', string $fromName = ''): bool
{
    $bOK = true;
    if (strlen($html) == 0) {
        echo '<pre>No message specified</pre>';
        $bOK = false;
    }
    if (strlen($subject) == 0) {
        echo '<pre>No subject specified</pre>';
        $bOK = false;
    }
    if (count($recipients) == 0 || (isset($recipients['email']) && strlen($recipients['email']) == 0) || (isset($recipients[0]['email']) && strlen($recipients[0]['email']) == 0)) {
        echo '<pre>No recipient(s) specified</pre>';
        $bOK = false;
    }
    if (!$bOK) {
        return false;
    }
    
    $encoding = cRegistry::getEncoding();
    
    $mail = initPHPMailer();
    $mail->CharSet = $encoding;

    $mail->Subject = html_entity_decode($subject, ENT_QUOTES, $encoding);
    $mail->FromName = html_entity_decode(((strlen($fromName)) ? $fromName : getEffectiveSetting('email', 'sender-name')), ENT_QUOTES, $encoding);

    // recipients
    if (isset($recipients[0]) && is_array($recipients[0])) {
        for ($i = 0, $n = count($recipients); $i < $n; $i ++) {
            if (strlen($recipients[$i]['email'])) {
                $mail->AddAddress($recipients[$i]['email'], ((strlen($recipients[$i]['name']) > 0) ? html_entity_decode($recipients[$i]['name'], ENT_QUOTES, $encoding) : $recipients[$i]['email']));
            }
        }
    } else {
        $mail->AddAddress($recipients['email'], ((strlen($recipients['name']) > 0) ? html_entity_decode($recipients['name'], ENT_QUOTES, $encoding) : $recipients['email']));
    }

    // set replyto if needed
    if(filter_var($fromEmail, FILTER_VALIDATE_EMAIL)) {
        $fromName = (strlen($fromName) > 0)?$fromName:$fromEmail;
        $mail->addReplyTo($fromEmail, $fromName);
    }
    
    // html and only txt body
    $mail->Body = $html;
    
    $message = substr($html, strpos($html, '<body'));
    $message = str_replace(array("\n", '</p>', '<br />', '<br>', '</li>'), array('', "</p>\n\n", "\n", "\n", "\n"), $message);
    $message = trim(strip_tags($message));
    $message = explode("\n", $message);
    for ($i = 0, $n = count($message); $i < $n; $i ++) {
        $message[$i] = trim($message[$i]);
    }
    $message = implode("\n", $message);
    $message = html_entity_decode($message, ENT_QUOTES, $encoding);
    try {
        $message = cString::replaceDiacritics($message);
    } catch (cInvalidArgumentException $e) {
        return false;
    }

    # <-- Nur-Text-Bereich
    $mail->AltBody = $message;

    if(count($attachments) > 0) {
        foreach ($attachments as $attachment) {
            if(is_file($attachment)) {
                $mail->addAttachment($attachment);
            }
        }
    }

    $mail->WordWrap = 76;
    
    if ($mail->Send()) {
        return true;
    } else {
        echo '<pre>' . $mail->ErrorInfo . '</pre>';
        return false;
    }
}