See Release Notes
Long Term Support Release
Differences Between: [Versions 310 and 401] [Versions 311 and 401] [Versions 39 and 401] [Versions 400 and 401]
1 <?php 2 // This file is part of Moodle - http://moodle.org/ 3 // 4 // Moodle is free software: you can redistribute it and/or modify 5 // it under the terms of the GNU General Public License as published by 6 // the Free Software Foundation, either version 3 of the License, or 7 // (at your option) any later version. 8 // 9 // Moodle is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU General Public License for more details. 13 // 14 // You should have received a copy of the GNU General Public License 15 // along with Moodle. If not, see <http://www.gnu.org/licenses/>. 16 17 /** 18 * Base class for players which return native HTML5 <video> or <audio> tags 19 * 20 * @package core_media 21 * @copyright 2016 Marina Glancy 22 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 23 */ 24 25 defined('MOODLE_INTERNAL') || die(); 26 27 /** 28 * Base class for players which return native HTML5 <video> or <audio> tags 29 * 30 * @package core_media 31 * @copyright 2016 Marina Glancy 32 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 33 */ 34 abstract class core_media_player_native extends core_media_player { 35 /** 36 * Extracts a value for an attribute 37 * 38 * @param string $tag html tag which properties are extracted, for example "<video ...>....</video>" 39 * @param string $attrname name of the attribute we are looking for 40 * @param string $type one of PARAM_* constants to clean the attribute value 41 * @return string|null 42 */ 43 public static function get_attribute($tag, $attrname, $type = PARAM_RAW) { 44 if (preg_match('/^<[^>]*\b' . $attrname . '="(.*?)"/is', $tag, $matches)) { 45 return clean_param(htmlspecialchars_decode($matches[1], ENT_COMPAT), $type); 46 } else if (preg_match('~^<[^>]*\b' . $attrname . '[ />]"~is', $tag, $matches)) { 47 // Some attributes may not have value, for example this is valid: <video controls>. 48 return clean_param("true", $type); 49 } 50 return null; 51 } 52 53 /** 54 * Removes an attribute from the media tags 55 * 56 * @param string $tag html tag which properties are extracted, for example "<video ...>....</video>" 57 * @param string|array $attrname 58 * @return string 59 */ 60 public static function remove_attributes($tag, $attrname) { 61 if (is_array($attrname)) { 62 $attrname = join('|', $attrname); 63 } 64 while (preg_match('/^(<[^>]*\b)(' . $attrname . ')=".*?"(.*)$/is', $tag, $matches)) { 65 $tag = $matches[1] . $matches[3]; 66 } 67 while (preg_match('~^(<[^>]*\b)(' . $attrname . ')([ />].*)$~is', $tag, $matches)) { 68 // Some attributes may not have value, for example: <video controls>. 69 $tag = $matches[1] . $matches[3]; 70 } 71 return $tag; 72 } 73 74 /** 75 * Adds attributes to the media tags 76 * 77 * @param string $tag html tag which properties are extracted, for example "<video ...>....</video>" 78 * @param array $attributes key-value pairs of attributes to be added 79 * @return string 80 */ 81 public static function add_attributes($tag, $attributes) { 82 $tag = self::remove_attributes($tag, array_keys($attributes)); 83 if (!preg_match('/^(<.*?)(>.*)$/s', $tag, $matches)) { 84 return $tag; 85 } 86 $rv = $matches[1]; 87 foreach ($attributes as $name => $value) { 88 $rv .= " $name=\"".s($value).'"'; 89 } 90 $rv .= $matches[2]; 91 return $rv; 92 } 93 94 /** 95 * Replaces all embedded <source> tags and src attribute 96 * 97 * @param string $tag html tag which properties are extracted, for example "<video ...>....</video>" 98 * @param string $sources replacement string (expected to contain <source> tags) 99 * @return string 100 */ 101 public static function replace_sources($tag, $sources) { 102 $tag = self::remove_attributes($tag, 'src'); 103 $tag = preg_replace(['~</?source\b[^>]*>~i'], '', $tag); 104 if (preg_match('/^(<.*?>)([^\0]*)$/ms', $tag, $matches)) { 105 $tag = $matches[1].$sources.$matches[2]; 106 } 107 return $tag; 108 } 109 110 public function get_supported_extensions() { 111 global $CFG; 112 require_once($CFG->libdir . '/filelib.php'); 113 return file_get_typegroup('extension', ['html_video', 'html_audio']); 114 } 115 116 public function list_supported_urls(array $urls, array $options = array()) { 117 $extensions = $this->get_supported_extensions(); 118 $result = array(); 119 foreach ($urls as $url) { 120 $ext = core_media_manager::instance()->get_extension($url); 121 if (in_array('.' . $ext, $extensions) && core_useragent::supports_html5($ext)) { 122 // Unfortunately html5 video does not handle fallback properly. 123 // https://www.w3.org/Bugs/Public/show_bug.cgi?id=10975 124 // That means we need to do browser detect and not use html5 on 125 // browsers which do not support the given type, otherwise users 126 // will not even see the fallback link. 127 $result[] = $url; 128 } 129 } 130 return $result; 131 } 132 }
title
Description
Body
title
Description
Body
title
Description
Body
title
Body