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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 return native HTML5 <video> or <audio> tags * * @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 return native HTML5 <video> or <audio> tags * * @package core_media * @copyright 2016 Marina Glancy * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ abstract class core_media_player_native extends core_media_player { /** * Extracts a value for an attribute * * @param string $tag html tag which properties are extracted, for example "<video ...>....</video>" * @param string $attrname name of the attribute we are looking for * @param string $type one of PARAM_* constants to clean the attribute value * @return string|null */ public static function get_attribute($tag, $attrname, $type = PARAM_RAW) { if (preg_match('/^<[^>]*\b' . $attrname . '="(.*?)"/is', $tag, $matches)) { return clean_param(htmlspecialchars_decode($matches[1]), $type); } else if (preg_match('~^<[^>]*\b' . $attrname . '[ />]"~is', $tag, $matches)) { // Some attributes may not have value, for example this is valid: <video controls>. return clean_param("true", $type); } return null; } /** * Removes an attribute from the media tags * * @param string $tag html tag which properties are extracted, for example "<video ...>....</video>" * @param string|array $attrname * @return string */ public static function remove_attributes($tag, $attrname) { if (is_array($attrname)) { $attrname = join('|', $attrname); } while (preg_match('/^(<[^>]*\b)(' . $attrname . ')=".*?"(.*)$/is', $tag, $matches)) { $tag = $matches[1] . $matches[3]; } while (preg_match('~^(<[^>]*\b)(' . $attrname . ')([ />].*)$~is', $tag, $matches)) { // Some attributes may not have value, for example: <video controls>. $tag = $matches[1] . $matches[3]; } return $tag; } /** * Adds attributes to the media tags * * @param string $tag html tag which properties are extracted, for example "<video ...>....</video>" * @param array $attributes key-value pairs of attributes to be added * @return string */ public static function add_attributes($tag, $attributes) { $tag = self::remove_attributes($tag, array_keys($attributes)); if (!preg_match('/^(<.*?)(>.*)$/s', $tag, $matches)) { return $tag; } $rv = $matches[1]; foreach ($attributes as $name => $value) { $rv .= " $name=\"".s($value).'"'; } $rv .= $matches[2]; return $rv; } /** * Replaces all embedded <source> tags and src attribute * * @param string $tag html tag which properties are extracted, for example "<video ...>....</video>" * @param string $sources replacement string (expected to contain <source> tags) * @return string */ public static function replace_sources($tag, $sources) { $tag = self::remove_attributes($tag, 'src'); $tag = preg_replace(['~</?source\b[^>]*>~i'], '', $tag); if (preg_match('/^(<.*?>)([^\0]*)$/ms', $tag, $matches)) { $tag = $matches[1].$sources.$matches[2]; } return $tag; } public function get_supported_extensions() { global $CFG; require_once($CFG->libdir . '/filelib.php'); return file_get_typegroup('extension', ['html_video', 'html_audio']); } public function list_supported_urls(array $urls, array $options = array()) { $extensions = $this->get_supported_extensions(); $result = array(); foreach ($urls as $url) { $ext = core_media_manager::instance()->get_extension($url); if (in_array('.' . $ext, $extensions) && core_useragent::supports_html5($ext)) { // Unfortunately html5 video does not handle fallback properly. // https://www.w3.org/Bugs/Public/show_bug.cgi?id=10975 // That means we need to do browser detect and not use html5 on // browsers which do not support the given type, otherwise users // will not even see the fallback link. $result[] = $url; } } return $result; } }