Dan Poltawski
dc88f6699d
While the patch worked as intended, we discovered some other concerns
about use of this setting in testing.
This reverts commit 840c1c554d.
133 lines
4.6 KiB
PHP
133 lines
4.6 KiB
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/>.
|
|
|
|
/**
|
|
* Media plugin filtering
|
|
*
|
|
* This filter will replace any links to a media file with
|
|
* a media plugin that plays that media inline
|
|
*
|
|
* @package filter
|
|
* @subpackage mediaplugin
|
|
* @copyright 2004 onwards Martin Dougiamas {@link http://moodle.com}
|
|
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
|
|
*/
|
|
|
|
defined('MOODLE_INTERNAL') || die();
|
|
|
|
/**
|
|
* Automatic media embedding filter class.
|
|
*
|
|
* It is highly recommended to configure servers to be compatible with our slasharguments,
|
|
* otherwise the "?d=600x400" may not work.
|
|
*
|
|
* @package filter
|
|
* @subpackage mediaplugin
|
|
* @copyright 2004 onwards Martin Dougiamas {@link http://moodle.com}
|
|
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
|
|
*/
|
|
class filter_mediaplugin extends moodle_text_filter {
|
|
/** @var bool True if currently filtering trusted text */
|
|
private $trusted;
|
|
/** @var core_media_renderer Media renderer */
|
|
private $mediarenderer;
|
|
/** @var string Partial regex pattern indicating possible embeddable content */
|
|
private $embedmarkers;
|
|
|
|
public function filter($text, array $options = array()) {
|
|
global $CFG, $PAGE;
|
|
|
|
if (!is_string($text) or empty($text)) {
|
|
// non string data can not be filtered anyway
|
|
return $text;
|
|
}
|
|
|
|
if (stripos($text, '</a>') === false) {
|
|
// Performance shortcut - if not </a> tag, nothing can match.
|
|
return $text;
|
|
}
|
|
|
|
if (!$this->mediarenderer) {
|
|
$this->mediarenderer = $PAGE->get_renderer('core', 'media');
|
|
$this->embedmarkers = $this->mediarenderer->get_embeddable_markers();
|
|
}
|
|
|
|
// Check SWF permissions.
|
|
$this->trusted = !empty($options['noclean']) or !empty($CFG->allowobjectembed);
|
|
|
|
// Handle all links that contain any 'embeddable' marker text (it could
|
|
// do all links, but the embeddable markers thing should make it faster
|
|
// by meaning for most links it doesn't drop into PHP code).
|
|
$newtext = preg_replace_callback($re = '~<a\s[^>]*href="([^"]*(?:' .
|
|
$this->embedmarkers . ')[^"]*)"[^>]*>([^>]*)</a>~is',
|
|
array($this, 'callback'), $text);
|
|
|
|
if (empty($newtext) or $newtext === $text) {
|
|
// error or not filtered
|
|
return $text;
|
|
}
|
|
|
|
return $newtext;
|
|
}
|
|
|
|
/**
|
|
* Replace link with embedded content, if supported.
|
|
*
|
|
* @param array $matches
|
|
* @return string
|
|
*/
|
|
private function callback(array $matches) {
|
|
global $CFG, $PAGE;
|
|
// Check if we ignore it.
|
|
if (preg_match('/class="[^"]*nomediaplugin/i', $matches[0])) {
|
|
return $matches[0];
|
|
}
|
|
|
|
// Get name.
|
|
$name = trim($matches[2]);
|
|
if (empty($name) or strpos($name, 'http') === 0) {
|
|
$name = ''; // Use default name.
|
|
}
|
|
|
|
// Split provided URL into alternatives.
|
|
$urls = core_media::split_alternatives($matches[1], $width, $height);
|
|
|
|
$options = array();
|
|
|
|
// Allow SWF (or not).
|
|
if ($this->trusted) {
|
|
$options[core_media::OPTION_TRUSTED] = true;
|
|
}
|
|
|
|
// We could test whether embed is possible using can_embed, but to save
|
|
// time, let's just embed it with the 'fallback to blank' option which
|
|
// does most of the same stuff anyhow.
|
|
$options[core_media::OPTION_FALLBACK_TO_BLANK] = true;
|
|
|
|
// NOTE: Options are not passed through from filter because the 'embed'
|
|
// code does not recognise filter options (it's a different kind of
|
|
// option-space) as it can be used in non-filter situations.
|
|
$result = $this->mediarenderer->embed_alternatives($urls, $name, $width, $height, $options);
|
|
|
|
// If something was embedded, return it, otherwise return original.
|
|
if ($result !== '') {
|
|
return $result;
|
|
} else {
|
|
return $matches[0];
|
|
}
|
|
}
|
|
}
|