Mailer.php

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<?php
namespace TYPO3\CMS\Core\Mail;

// Make sure Swift's auto-loader is registered
require_once PATH_typo3 . 'contrib/swiftmailer/swift_required.php';

class Mailer extends \Swift_Mailer {

    protected $transport;

    protected $mailSettings = array();

    public function __construct(\Swift_Transport $transport = NULL) {
        if ($transport !== NULL) {
            $this->transport = $transport;
        } else {
            if (empty($this->mailSettings)) {
                $this->injectMailSettings();
            }
            try {
                $this->initializeTransport();
            } catch (\Exception $e) {
                throw new \TYPO3\CMS\Core\Exception($e->getMessage(), 1291068569);
            }
        }
        parent::__construct($this->transport);
    }

    private function initializeTransport() {
        switch ($this->mailSettings['transport']) {
            case 'smtp':
                // Get settings to be used when constructing the transport object
                list($host, $port) = preg_split('/:/', $this->mailSettings['transport_smtp_server']);
                if ($host === '') {
                    throw new \TYPO3\CMS\Core\Exception('$TYPO3_CONF_VARS[\'MAIL\'][\'transport_smtp_server\'] needs to be set when transport is set to "smtp"', 1291068606);
                }
                if ($port === NULL || $port === '') {
                    $port = '25';
                }
                $useEncryption = $this->mailSettings['transport_smtp_encrypt'] ?: NULL;
                // Create our transport
                $this->transport = \Swift_SmtpTransport::newInstance($host, $port, $useEncryption);
                // Need authentication?
                $username = $this->mailSettings['transport_smtp_username'];
                if ($username !== '') {
                    $this->transport->setUsername($username);
                }
                $password = $this->mailSettings['transport_smtp_password'];
                if ($password !== '') {
                    $this->transport->setPassword($password);
                }
                break;
            case 'sendmail':
                $sendmailCommand = $this->mailSettings['transport_sendmail_command'];
                if (empty($sendmailCommand)) {
                    throw new \TYPO3\CMS\Core\Exception('$TYPO3_CONF_VARS[\'MAIL\'][\'transport_sendmail_command\'] needs to be set when transport is set to "sendmail"', 1291068620);
                }
                // Create our transport
                $this->transport = \Swift_SendmailTransport::newInstance($sendmailCommand);
                break;
            case 'mbox':
                $mboxFile = $this->mailSettings['transport_mbox_file'];
                if ($mboxFile == '') {
                    throw new \TYPO3\CMS\Core\Exception('$TYPO3_CONF_VARS[\'MAIL\'][\'transport_mbox_file\'] needs to be set when transport is set to "mbox"', 1294586645);
                }
                // Create our transport
                $this->transport = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Mail\\MboxTransport', $mboxFile);
                break;
            case 'mail':
                // Create the transport, no configuration required
                $this->transport = \Swift_MailTransport::newInstance();
                break;
            default:
                // Custom mail transport
                $customTransport = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance($this->mailSettings['transport'], $this->mailSettings);
                if ($customTransport instanceof \Swift_Transport) {
                    $this->transport = $customTransport;
                } else {
                    throw new \RuntimeException($this->mailSettings['transport'] . ' is not an implementation of \\Swift_Transport,
                            but must implement that interface to be used as a mail transport.', 1323006478);
                }
        }
    }

    public function injectMailSettings(array $mailSettings = NULL) {
        if (is_array($mailSettings)) {
            $this->mailSettings = $mailSettings;
        } else {
            $this->mailSettings = (array) $GLOBALS['TYPO3_CONF_VARS']['MAIL'];
        }
    }

}