Victor Deniz Falcon
121 lines
4.2 KiB
PHP
121 lines
4.2 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* H5P filter
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*
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* @package filter_h5p
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* @copyright 2019 Victor Deniz <victor@moodle.com>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die;
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/**
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* H5P filter
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*
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* This filter will replace any occurrence of H5P URLs with the corresponding H5P content embed code
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*
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* @package filter_h5p
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* @copyright 2019 Victor Deniz <victor@moodle.com>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class filter_h5p extends moodle_text_filter {
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/**
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* @var boolean $loadresizerjs This is whether to request the resize.js script.
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*/
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private static $loadresizerjs = true;
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/**
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* Function filter replaces any h5p-sources.
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*
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* @param string $text HTML content to process
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* @param array $options options passed to the filters
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* @return string
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*/
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public function filter($text, array $options = array()) {
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if (!is_string($text) or empty($text)) {
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// Non string data can not be filtered anyway.
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return $text;
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}
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if (stripos($text, 'http') === false) {
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return $text;
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}
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$allowedsources = get_config('filter_h5p', 'allowedsources');
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$allowedsources = array_filter(array_map('trim', explode("\n", $allowedsources)));
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if (empty($allowedsources)) {
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return $text;
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}
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$params = array(
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'tagbegin' => "<iframe src=",
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'tagend' => "</iframe>"
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);
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foreach ($allowedsources as $source) {
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// It is needed to add "/embed" at the end of URLs like https:://*.h5p.com/content/12345 (H5P.com).
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$params['urlmodifier'] = '';
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if (!(stripos($source, 'embed'))) {
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$params['urlmodifier'] = '/embed';
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}
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// Convert special chars.
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$specialchars = ['*', '?', '&'];
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$escapedspecialchars = ['[^.]+', '\?', '&'];
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$sourceid = str_replace('[id]', '[0-9]+', $source);
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$escapechars = str_replace($specialchars, $escapedspecialchars, $sourceid);
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$ultimatepattern = '#(' . $escapechars . ')#';
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$h5pcontenturl = new filterobject($source, null, null, false,
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false, null, [$this, 'filterobject_prepare_replacement_callback'], $params);
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$h5pcontenturl->workregexp = $ultimatepattern;
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$h5pcontents[] = $h5pcontenturl;
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}
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return filter_phrases($text, $h5pcontents, null, null, false, true);
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}
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/**
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* Callback used by filterobject / filter_phrases.
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*
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* @param string $tagbegin HTML to insert before any match
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* @param string $tagend HTML to insert after any match
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* @param string $urlmodifier string to add to the match URL
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* @return array [$hreftagbegin, $hreftagend, $replacementphrase] for filterobject.
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*/
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public function filterobject_prepare_replacement_callback($tagbegin, $tagend, $urlmodifier) {
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$sourceurl = "$1";
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if ($urlmodifier !== "") {
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$sourceurl .= $urlmodifier;
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}
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$h5piframesrc = "\"".$sourceurl."\" width=\"100%\" height=\"637\" allowfullscreen=\"allowfullscreen\" style=\"border: 0;\">";
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// We want to request the resizing script only once.
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if (self::$loadresizerjs) {
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$tagend .= '<script src="https://h5p.org/sites/all/modules/h5p/library/js/h5p-resizer.js"></script>';
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self::$loadresizerjs = false;
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}
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return [$tagbegin, $tagend, $h5piframesrc];
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}
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}
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