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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/>. /** * Base class for players which handle external links * * @package core_media * @copyright 2016 Marina Glancy * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ defined('MOODLE_INTERNAL') || die(); /** * Base class for players which handle external links (YouTube etc). * * As opposed to media files. * * @package core_media * @copyright 2016 Marina Glancy * @author 2011 The Open University * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ abstract class core_media_player_external extends core_media_player { /** * Array of matches from regular expression - subclass can assume these * will be valid when the embed function is called, to save it rerunning * the regex. * @var array */ protected $matches; /** * Part of a regular expression, including ending ~ symbol (note: these * regexes use ~ instead of / because URLs and HTML code typically include * / symbol and makes harder to read if you have to escape it). * Matches the end part of a link after you have read the 'important' data * including optional #d=400x300 at end of url, plus content of <a> tag, * up to </a>. * @var string */ const END_LINK_REGEX_PART = '[^#]*(#d=([\d]{1,4})x([\d]{1,4}))?~si'; public function embed($urls, $name, $width, $height, $options) { return $this->embed_external(reset($urls), $name, $width, $height, $options); } /** * Obtains HTML code to embed the link. * @param moodle_url $url Single URL to embed * @param string $name Display name; '' to use default * @param int $width Optional width; 0 to use default * @param int $height Optional height; 0 to use default * @param array $options Options array * @return string HTML code for embed */ protected abstract function embed_external(moodle_url $url, $name, $width, $height, $options); 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) { return array(); } $url = reset($urls); // Check against regex. if (preg_match($this->get_regex(), $url->out(false), $this->matches)) { return array($url); } return array(); } /** * Returns regular expression used to match URLs that this player handles * @return string PHP regular expression e.g. '~^https?://example.org/~' */ protected function get_regex() { return '~^unsupported~'; } /** * Annoyingly, preg_match $matches result does not always have the same * number of parameters - it leaves out optional ones at the end. WHAT. * Anyway, this function can be used to fix it. * @param array $matches Array that should be adjusted * @param int $count Number of capturing groups (=6 to make $matches[6] work) */ protected static function fix_match_count(&$matches, $count) { for ($i = count($matches); $i <= $count; $i++) { $matches[$i] = false; } } }