Current File : /opt/bitnami/apps/moodle/htdocs.backup/filter/displayh5p/filter.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/>.
/**
* Display H5P filter
*
* @package filter_displayh5p
* @copyright 2019 Victor Deniz <victor@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die;
/**
* Display H5P filter
*
* This filter will replace any occurrence of H5P URLs with the corresponding H5P content embed code
*
* @package filter_displayh5p
* @copyright 2019 Victor Deniz <victor@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class filter_displayh5p extends moodle_text_filter {
/**
* @var boolean $loadresizerjs This is whether to request the resize.js script.
*/
private static $loadresizerjs = true;
/**
* Function filter replaces any h5p-sources.
*
* @param string $text HTML content to process
* @param array $options options passed to the filters
* @return string
*/
public function filter($text, array $options = array()) {
global $CFG;
if (!is_string($text) or empty($text)) {
// Non string data can not be filtered anyway.
return $text;
}
// We are trying to minimize performance impact checking there's some H5P related URL.
$h5purl = '(http[^ &<]*h5p)';
if (!preg_match($h5purl, $text)) {
return $text;
}
$allowedsources = get_config('filter_displayh5p', 'allowedsources');
$allowedsources = array_filter(array_map('trim', explode("\n", $allowedsources)));
$localsource = '('.preg_quote($CFG->wwwroot).'/[^ &\#"\'<]*\.h5p([?][^ "\'<]*)?[^ \#"\'<]*)';
$allowedsources[] = $localsource;
$params = array(
'tagbegin' => '<iframe src="',
'tagend' => '</iframe>'
);
$specialchars = ['?', '&'];
$escapedspecialchars = ['\?', '&'];
$h5pcontents = array();
// Check all allowed sources.
foreach ($allowedsources as $source) {
// It is needed to add "/embed" at the end of URLs like https:://*.h5p.com/content/12345 (H5P.com).
$params['urlmodifier'] = '';
if (($source == $localsource)) {
$params['tagbegin'] = '<iframe src="'.$CFG->wwwroot.'/h5p/embed.php?url=';
$ultimatepattern = '#'.$source.'#';
} else {
if (!stripos($source, 'embed')) {
$params['urlmodifier'] = '/embed';
}
// Convert special chars.
$sourceid = str_replace('[id]', '[0-9]+', $source);
$escapechars = str_replace($specialchars, $escapedspecialchars, $sourceid);
$ultimatepattern = '#(' . $escapechars . ')#';
}
// Improve performance creating filterobjects only when needed.
if (!preg_match($ultimatepattern, $text)) {
continue;
}
$h5pcontenturl = new filterobject($source, null, null, false,
false, null, [$this, 'filterobject_prepare_replacement_callback'], $params);
$h5pcontenturl->workregexp = $ultimatepattern;
$h5pcontents[] = $h5pcontenturl;
}
if (empty($h5pcontents)) {
// No matches to deal with.
return $text;
}
$result = filter_phrases($text, $h5pcontents, null, null, false, true);
// Encoding H5P file URLs.
// embed.php page is requesting a PARAM_LOCALURL url parameter, so for files/directories use non-alphanumeric
// characters, we need to encode the parameter. Fetch url parameter added to embed.php and encode the whole url.
$localurl = '#\?url=([^" <]*[\/]+[^" <]*\.h5p)([?][^"]*)?#';
$result = preg_replace_callback($localurl,
function ($matches) {
$baseurl = rawurlencode($matches[1]);
// Deal with possible parameters in the url link.
if (!empty($matches[2])) {
$match = explode('?', $matches[2]);
if (!empty($match[1])) {
$baseurl = $baseurl."&".$match[1];
}
}
return "?url=".$baseurl;
}, $result);
return $result;
}
/**
* Callback used by filterobject / filter_phrases.
*
* @param string $tagbegin HTML to insert before any match
* @param string $tagend HTML to insert after any match
* @param string $urlmodifier string to add to the match URL
* @return array [$hreftagbegin, $hreftagend, $replacementphrase] for filterobject.
*/
public function filterobject_prepare_replacement_callback($tagbegin, $tagend, $urlmodifier) {
$sourceurl = "$1";
if ($urlmodifier !== "") {
$sourceurl .= $urlmodifier;
}
$h5piframesrc = $sourceurl . '" class="h5p-iframe" name="h5pcontent"' .
' style="height:230px; width: 100%; border: 0;" allowfullscreen="allowfullscreen">';
// We want to request the resizing script only once.
if (self::$loadresizerjs) {
$resizerurl = new moodle_url('/lib/h5p/js/h5p-resizer.js');
$tagend .= '<script src="' . $resizerurl->out() . '"></script>';
self::$loadresizerjs = false;
}
return [$tagbegin, $tagend, $h5piframesrc];
}
}
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