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