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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Customised version of phpmailer for Moodle
 *
 * @package    core
 * @author     Dan Poltawski <talktodan@gmail.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

// PLEASE NOTE: we use the phpmailer class _unmodified_
// through the joys of OO. Distros are free to use their stock
// version of this file.

/**
 * Moodle Customised version of the PHPMailer class
 *
 * This class extends the stock PHPMailer class
 * in order to make sensible configuration choices,
 * and behave in a way which is friendly to moodle.
 *
 * @copyright 2009 Dan Poltawski <talktodan@gmail.com>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @since     Moodle 2.0
 */
class moodle_phpmailer extends \PHPMailer\PHPMailer\PHPMailer {

    /**
     * Constructor - creates an instance of the PHPMailer class
     * with Moodle defaults.
     */
    public function __construct(){
        global $CFG;
        $this->Version   = 'Moodle '.$CFG->version;         // mailer version
        $this->CharSet   = 'UTF-8';
        // MDL-52637: Disable the automatic TLS encryption added in v5.2.10 (9da56fc1328a72aa124b35b738966315c41ef5c6).
        $this->SMTPAutoTLS = false;

        if (!empty($CFG->smtpauthtype)) {
            $this->AuthType = $CFG->smtpauthtype;
        }

        // Some MTAs may do double conversion of LF if CRLF used, CRLF is required line ending in RFC 822bis.
        if (isset($CFG->mailnewline) and $CFG->mailnewline == 'CRLF') {
            parent::setLE("\r\n");
        } else {
            parent::setLE("\n");
        }
    }

    /**
     * Extended AddCustomHeader function in order to stop duplicate 
     * message-ids
     * http://tracker.moodle.org/browse/MDL-3681
     */
    public function addCustomHeader($custom_header, $value = null) {
        if ($value === null and preg_match('/message-id:(.*)/i', $custom_header, $matches)) {
            $this->MessageID = trim($matches[1]);
            return true;
        } else if ($value !== null and strcasecmp($custom_header, 'message-id') === 0) {
            $this->MessageID = trim($value);
            return true;
        } else {
            return parent::addCustomHeader($custom_header, $value);
        }
    }

    /**
     * Use internal moodles own core_text to encode mimeheaders.
     * Fall back to phpmailers inbuilt functions if not 
     */
    public function encodeHeader($str, $position = 'text') {
        $encoded = core_text::encode_mimeheader($str, $this->CharSet);
        if ($encoded !== false) {
            if ($position === 'phrase') {
                // Escape special symbols in each line in the encoded string, join back together and enclose in quotes.
                $chunks = preg_split("/\\n/", $encoded);
                $chunks = array_map(function($chunk) {
                    return addcslashes($chunk, "\0..\37\177\\\"");
                }, $chunks);
                return '"' . join(parent::getLE(), $chunks) . '"';
            }
            return str_replace("\n", parent::getLE(), $encoded);
        }

        return parent::encodeHeader($str, $position);
    }

    /**
     * Replaced function to fix tz bug:
     * http://tracker.moodle.org/browse/MDL-12596
     */
    public static function rfcDate() {
        $tz = date('Z');
        $tzs = ($tz < 0) ? '-' : '+';
        $tz = abs($tz);
        $tz = (($tz - ($tz%3600) )/3600)*100 + ($tz%3600)/60; // fixed tz bug
        $result = sprintf("%s %s%04d", date('D, j M Y H:i:s'), $tzs, $tz);

        return $result;
    }

    /**
     * Sends this mail.
     *
     * This function has been overridden to facilitate unit testing.
     *
     * @return bool
     */
    public function postSend() {
        // Now ask phpunit if it wants to catch this message.
        if (PHPUNIT_TEST) {
            if (!phpunit_util::is_redirecting_phpmailer()) {
                debugging('Unit tests must not send real emails! Use $this->redirectEmails()');
                return true;
            }
            $mail = new stdClass();
            $mail->header = $this->MIMEHeader;
            $mail->body = $this->MIMEBody;
            $mail->subject = $this->Subject;
            $mail->from = $this->From;
            $mail->to = $this->to[0][0];
            phpunit_util::phpmailer_sent($mail);
            return true;
        } else {
            return parent::postSend();
        }
    }
}