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*
* Players that support other HTML5 features such as tracks may find them in this option.
*/
const OPTION_ORIGINAL_TEXT = 'originaltext';
/** @var array Array of available 'player' objects */
private $players;
/** @var string Regex pattern for links which may contain embeddable content */
private $embeddablemarkers;
/** @var core_media_manager caches a singleton instance */
static private $instance;
/** @var moodle_page page this instance was initialised for */
private $page;
/**
* Returns a singleton instance of a manager
*
* Note as of Moodle 3.3, this will call setup for you.
*
* @return core_media_manager
*/
public static function instance($page = null) {
// Use the passed $page if given, otherwise the $PAGE global.
if (!$page) {
global $PAGE;
$page = $PAGE;
}
if (self::$instance === null || ($page && self::$instance->page !== $page)) {
self::$instance = new self($page);
}
return self::$instance;
}
/**
* Construct a new core_media_manager instance
*
* @param moodle_page $page The page we are going to add requirements to.
* @see core_media_manager::instance()
*/
private function __construct($page) {
if ($page) {
$this->page = $page;
$players = $this->get_players();
foreach ($players as $player) {
$player->setup($page);
}
} else {
debugging('Could not determine the $PAGE. Media plugins will not be set up', DEBUG_DEVELOPER);
}
}
/**
* @deprecated since Moodle 3.3. The setup is now done in ::instance() so there is no need to call this.
*/
public function setup() {
throw new coding_exception('core_media_manager::setup() can not be used any more because it is done in ::instance()');
}
/**
* Resets cached singleton instance. To be used after $CFG->media_plugins_sortorder is modified
*/
public static function reset_caches() {
self::$instance = null;
}
/**
* Obtains the list of core_media_player objects currently in use to render
* items.
*
* The list is in rank order (highest first) and does not include players
* which are disabled.
*
* @return core_media_player[] Array of core_media_player objects in rank order
*/
private function get_players() {
// Save time by only building the list once.
if (!$this->players) {
$sortorder = \core\plugininfo\media::get_enabled_plugins();
$this->players = [];
foreach ($sortorder as $name) {
$classname = "media_" . $name . "_plugin";
if (class_exists($classname)) {
$this->players[] = new $classname();
}
}
}
return $this->players;
}
/**
* Renders a media file (audio or video) using suitable embedded player.
*
* See embed_alternatives function for full description of parameters.
* This function calls through to that one.
*
* When using this function you can also specify width and height in the
* URL by including ?d=100x100 at the end. If specified in the URL, this
* will override the $width and $height parameters.
*
* @param moodle_url $url Full URL of media file
* @param string $name Optional user-readable name to display in download link
* @param int $width Width in pixels (optional)
* @param int $height Height in pixels (optional)
* @param array $options Array of key/value pairs
* @return string HTML content of embed
*/
public function embed_url(moodle_url $url, $name = '', $width = 0, $height = 0,
$options = array()) {
// Get width and height from URL if specified (overrides parameters in
// function call).
$rawurl = $url->out(false);
if (preg_match('/[?#]d=([\d]{1,4}%?)x([\d]{1,4}%?)/', $rawurl, $matches)) {
$width = $matches[1];
$height = $matches[2];
$url = new moodle_url(str_replace($matches[0], '', $rawurl));
}
// Defer to array version of function.
return $this->embed_alternatives(array($url), $name, $width, $height, $options);
}
/**
* Renders media files (audio or video) using suitable embedded player.
* The list of URLs should be alternative versions of the same content in
* multiple formats. If there is only one format it should have a single
* entry.
*
* If the media files are not in a supported format, this will give students
* a download link to each format. The download link uses the filename
* unless you supply the optional name parameter.
*
* Width and height are optional. If specified, these are suggested sizes
* and should be the exact values supplied by the user, if they come from
* user input. These will be treated as relating to the size of the video
* content, not including any player control bar.
*
* For audio files, height will be ignored. For video files, a few formats
* work if you specify only width, but in general if you specify width
* you must specify height as well.
*
* The $options array is passed through to the core_media_player classes
* that render the object tag. The keys can contain values from
* core_media::OPTION_xx.
*
* @param array $alternatives Array of moodle_url to media files
* @param string $name Optional user-readable name to display in download link
* @param int $width Width in pixels (optional)
* @param int $height Height in pixels (optional)
* @param array $options Array of key/value pairs
* @return string HTML content of embed
*/
public function embed_alternatives($alternatives, $name = '', $width = 0, $height = 0,
$options = array()) {
// Get list of player plugins.
$players = $this->get_players();
// Set up initial text which will be replaced by first player that
// supports any of the formats.
$out = core_media_player::PLACEHOLDER;
// Loop through all players that support any of these URLs.
foreach ($players as $player) {
$supported = $player->list_supported_urls($alternatives, $options);
if ($supported) {
// Embed.
$text = $player->embed($supported, $name, $width, $height, $options);
// Put this in place of the 'fallback' slot in the previous text.
$out = str_replace(core_media_player::PLACEHOLDER, $text, $out);
// Check if we need to continue looking for players.
if (strpos($out, core_media_player::PLACEHOLDER) === false) {
break;
}
}
}
if (!empty($options[self::OPTION_FALLBACK_TO_BLANK]) && $out === core_media_player::PLACEHOLDER) {
// In case of OPTION_FALLBACK_TO_BLANK and no player matched do not fallback to link, just return empty string.
return '';
}
// Remove 'fallback' slot from final version and return it.
$fallback = $this->fallback_to_link($alternatives, $name, $options);
$out = str_replace(core_media_player::PLACEHOLDER, $fallback, $out);
$out = str_replace(core_media_player::LINKPLACEHOLDER, $fallback, $out);
if (!empty($options[self::OPTION_BLOCK]) && $out !== '') {
$out = html_writer::tag('div', $out, array('class' => 'resourcecontent'));
}
return $out;
}
/**
* Returns links to the specified URLs unless OPTION_NO_LINK is passed.
*
* @param array $urls URLs of media files
* @param string $name Display name; '' to use default
* @param array $options Options array
* @return string HTML code for embed
*/
private function fallback_to_link($urls, $name, $options) {
// If link is turned off, return empty.
if (!empty($options[self::OPTION_NO_LINK])) {
return '';
}
// Build up link content.
$output = '';
foreach ($urls as $url) {
if (strval($name) !== '' && $output === '') {
$title = $name;
} else {
$title = $this->get_filename($url);
}
$printlink = html_writer::link($url, $title, array('class' => 'mediafallbacklink'));
if ($output) {
// Where there are multiple available formats, there are fallback links
// for all formats, separated by /.
$output .= ' / ';
}
$output .= $printlink;
}
return $output;
}
/**
* Checks whether a file can be embedded. If this returns true you will get
* an embedded player; if this returns false, you will just get a download
* link.
*
* This is a wrapper for can_embed_urls.
*
* @param moodle_url $url URL of media file
* @param array $options Options (same as when embedding)
* @return bool True if file can be embedded
*/
public function can_embed_url(moodle_url $url, $options = array()) {
return $this->can_embed_urls(array($url), $options);
}
/**
* Checks whether a file can be embedded. If this returns true you will get
* an embedded player; if this returns false, you will just get a download
* link.
*
* @param array $urls URL of media file and any alternatives (moodle_url)
* @param array $options Options (same as when embedding)
* @return bool True if file can be embedded
*/
public function can_embed_urls(array $urls, $options = array()) {
// Check all players to see if any of them support it.
foreach ($this->get_players() as $player) {
// First player that supports it, return true.
if ($player->list_supported_urls($urls, $options)) {
return true;
}
}
return false;
}
/**
* Obtains a list of markers that can be used in a regular expression when
* searching for URLs that can be embedded by any player type.
*
* This string is used to improve peformance of regex matching by ensuring
* that the (presumably C) regex code can do a quick keyword check on the
* URL part of a link to see if it matches one of these, rather than having
* to go into PHP code for every single link to see if it can be embedded.
*
* @return string String suitable for use in regex such as '(\.mp4|\.flv)'
*/
public function get_embeddable_markers() {
if (empty($this->embeddablemarkers)) {
$markers = '';
foreach ($this->get_players() as $player) {
foreach ($player->get_embeddable_markers() as $marker) {
if ($markers !== '') {
$markers .= '|';
}
$markers .= preg_quote($marker);
}
}
$this->embeddablemarkers = $markers;
}
return $this->embeddablemarkers;
}
/**
* Given a string containing multiple URLs separated by #, this will split
* it into an array of moodle_url objects suitable for using when calling
* embed_alternatives.
*
* Note that the input string should NOT be html-escaped (i.e. if it comes
* from html, call html_entity_decode first).
*
* @param string $combinedurl String of 1 or more alternatives separated by #
* @param int $width Output variable: width (will be set to 0 if not specified)
* @param int $height Output variable: height (0 if not specified)
* @return array Array of 1 or more moodle_url objects
*/
public function split_alternatives($combinedurl, &$width, &$height) {
global $CFG;
$urls = explode('#', $combinedurl);
$width = 0;
$height = 0;
$returnurls = array();
foreach ($urls as $url) {
$matches = null;
// You can specify the size as a separate part of the array like
// #d=640x480 without actually including a url in it.
if (preg_match('/^d=([\d]{1,4})x([\d]{1,4})$/i', $url, $matches)) {
$width = $matches[1];
$height = $matches[2];
continue;
}
// Can also include the ?d= as part of one of the URLs (if you use
// more than one they will be ignored except the last).
if (preg_match('/\?d=([\d]{1,4})x([\d]{1,4})$/i', $url, $matches)) {
$width = $matches[1];
$height = $matches[2];
// Trim from URL.
$url = str_replace($matches[0], '', $url);
}
// Clean up url.
$url = fix_utf8($url);
include_once($CFG->dirroot . '/lib/validateurlsyntax.php');
if (!validateUrlSyntax($url, 's?H?S?F?R?E?u-P-a?I?p?f?q?r?')) {
continue;
}
// Turn it into moodle_url object.
$returnurls[] = new moodle_url($url);
}
return $returnurls;
}
/**
* Returns the file extension for a URL.
* @param moodle_url $url URL
*/
public function get_extension(moodle_url $url) {
// Note: Does not use core_text (. is UTF8-safe).
$filename = self::get_filename($url);
$dot = strrpos($filename, '.');
if ($dot === false) {
return '';
} else {
return strtolower(substr($filename, $dot + 1));
}
}
/**
* Obtains the filename from the moodle_url.
* @param moodle_url $url URL
* @return string Filename only (not escaped)
*/
public function get_filename(moodle_url $url) {
// Use the 'file' parameter if provided (for links created when
// slasharguments was off). If not present, just use URL path.
$path = $url->get_param('file');
if (!$path) {
$path = $url->get_path();
}
// Remove everything before last / if present. Does not use textlib as / is UTF8-safe.
$slash = strrpos($path, '/');
if ($slash !== false) {
$path = substr($path, $slash + 1);
}
return $path;
}
/**
* Guesses MIME type for a moodle_url based on file extension.
* @param moodle_url $url URL
* @return string MIME type
*/
public function get_mimetype(moodle_url $url) {
return mimeinfo('type', $this->get_filename($url));
}
}