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Editing: plugin.php

<?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/>.

/**
 * Main class for plugin 'media_youtube'
 *
 * @package   media_youtube
 * @copyright 2016 Marina Glancy
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

/**
 * Player that creates youtube embedding.
 *
 * @package   media_youtube
 * @author    2011 The Open University
 * @copyright 2016 Marina Glancy
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class media_youtube_plugin extends core_media_player_external {
    /**
     * Stores whether the playlist regex was matched last time when
     * {@link list_supported_urls()} was called
     * @var bool
     */
    protected $isplaylist = false;

public function list_supported_urls(array $urls, array $options = array()) {
        // These only work with a SINGLE url (there is no fallback).
        if (count($urls) == 1) {
            $url = reset($urls);

// Check against regex.
            if (preg_match($this->get_regex(), $url->out(false), $this->matches)) {
                $this->isplaylist = false;
                return array($url);
            }

// Check against playlist regex.
            if (preg_match($this->get_regex_playlist(), $url->out(false), $this->matches)) {
                $this->isplaylist = true;
                return array($url);
            }
        }

return array();
    }

protected function embed_external(moodle_url $url, $name, $width, $height, $options) {

$info = trim($name ?? '');
        if (empty($info) or strpos($info, 'http') === 0) {
            $info = get_string('pluginname', 'media_youtube');
        }
        $info = s($info);

self::pick_video_size($width, $height);

if ($this->isplaylist) {

$site = $this->matches[1];
            $playlist = $this->matches[3];

return <<<OET
<span class="mediaplugin mediaplugin_youtube">
<iframe width="$width" height="$height" src="https://$site/embed/videoseries?list=$playlist" frameborder="0" allowfullscreen="1"></iframe>
</span>
OET;
        } else {

$videoid = end($this->matches);
            $params = '';
            $start = self::get_start_time($url);
            if ($start > 0) {
                $params .= "start=$start&amp;";
            }

$listid = $url->param('list');
            // Check for non-empty but valid playlist ID.
            if (!empty($listid) && !preg_match('/[^a-zA-Z0-9\-_]/', $listid)) {
                // This video is part of a playlist, and we want to embed it as such.
                $params .= "list=$listid&amp;";
            }

return <<<OET
<span class="mediaplugin mediaplugin_youtube">
<iframe title="$info" width="$width" height="$height"
  src="https://www.youtube.com/embed/$videoid?{$params}rel=0&amp;wmode=transparent" frameborder="0" allowfullscreen="1"></iframe>
</span>
OET;
        }

}

/**
     * Check for start time parameter.  Note that it's in hours/mins/secs in the URL,
     * but the embedded player takes only a number of seconds as the "start" parameter.
     * @param moodle_url $url URL of video to be embedded.
     * @return int Number of seconds video should start at.
     */
    protected static function get_start_time($url) {
        $matches = array();
        $seconds = 0;

$rawtime = $url->param('t');
        if (empty($rawtime)) {
            $rawtime = $url->param('start');
        }

if (is_numeric($rawtime)) {
            // Start time already specified as a number of seconds; ensure it's an integer.
            $seconds = $rawtime;
        } else if (preg_match('/(\d+?h)?(\d+?m)?(\d+?s)?/i', $rawtime ?? '', $matches)) {
            // Convert into a raw number of seconds, as that's all embedded players accept.
            for ($i = 1; $i < count($matches); $i++) {
                if (empty($matches[$i])) {
                    continue;
                }
                $part = str_split($matches[$i], strlen($matches[$i]) - 1);
                switch ($part[1]) {
                    case 'h':
                        $seconds += 3600 * $part[0];
                        break;
                    case 'm':
                        $seconds += 60 * $part[0];
                        break;
                    default:
                        $seconds += $part[0];
                }
            }
        }

return intval($seconds);
    }

/**
     * Returns regular expression used to match URLs for single youtube video
     * @return string PHP regular expression e.g. '~^https?://example.org/~'
     */
    protected function get_regex() {
        // Regex for standard youtube link.
        $link = '(youtube(-nocookie)?\.com/(?:watch\?v=|v/))';
        // Regex for shortened youtube link.
        $shortlink = '((youtu|y2u)\.be/)';

// Initial part of link.
        $start = '~^https?://((www|m)\.)?(' . $link . '|' . $shortlink . ')';
        // Middle bit: Video key value.
        $middle = '([a-z0-9\-_]+)';
        return $start . $middle . core_media_player_external::END_LINK_REGEX_PART;
    }

/**
     * Returns regular expression used to match URLs for youtube playlist
     * @return string PHP regular expression e.g. '~^https?://example.org/~'
     */
    protected function get_regex_playlist() {
        // Initial part of link.
        $start = '~^https?://(www\.youtube(-nocookie)?\.com)/';
        // Middle bit: either view_play_list?p= or p/ (doesn't work on youtube) or playlist?list=.
        $middle = '(?:view_play_list\?p=|p/|playlist\?list=)([a-z0-9\-_]+)';
        return $start . $middle . core_media_player_external::END_LINK_REGEX_PART;
    }

public function get_embeddable_markers() {
        return array('youtube.com', 'youtube-nocookie.com', 'youtu.be', 'y2u.be');
    }

/**
     * Default rank
     * @return int
     */
    public function get_rank() {
        return 1001;
    }
}

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