/**

* Set up the filter using settings provided in the admin settings page.

*

* @param $page

* @param $context

*/

public function setup($page, $context) {

// This only requires execution once per request.

static $jsinitialised = false;

if (get_config('filter_oembed', 'lazyload')) {

if (empty($jsinitialised)) {

$page->requires->yui_module(

'moodle-filter_oembed-lazyload',

'M.filter_oembed.init_filter_lazyload',

array(array('courseid' => 0)));

$jsinitialised = true;

}

}

}

/**

* Filters the given HTML text, looking for links pointing to media from services that support the Oembed

* protocol and replacing them with the embeddable content returned from the protocol.

*

* @param $text HTML to be processed.

* @param $options

* @return string String containing processed HTML.

*/

public function filter($text, array $options = array()) {

global $CFG;

if (!is_string($text) or empty($text)) {

// Non string data can not be filtered anyway.

return $text;

}

// if (get_user_device_type() !== 'default'){

// no lazy video on mobile

// return $text;

// }

if (stripos($text, '</a>') === false) {

// Performance shortcut - all regexes below end with the </a> tag.

// If not present nothing can match.

return $text;

}

$newtext = $text; // We need to return the original value if regex fails!

if (get_config('filter_oembed', 'youtube')) {

$search = '/<a\s[^>]*href="((https?:\/\/(www\.)?)(youtube\.com|youtu\.be|youtube\.googleapis.com)\/(?:embed\/|v\/|watch\?v=|watch\?.+?&amp;v=|watch\?.+?&v=)?((\w|-){11})(.*?))"(.*?)>(.*?)<\/a>/is';

$newtext = preg_replace_callback($search, 'filter_oembed_youtubecallback', $newtext);

}

if (get_config('filter_oembed', 'vimeo')) {

$search = '/<a\s[^>]*href="(https?:\/\/(www\.)?)(vimeo\.com)\/(\d+)(.*?)"(.*?)>(.*?)<\/a>/is';

$newtext = preg_replace_callback($search, 'filter_oembed_vimeocallback', $newtext);

}

if (get_config('filter_oembed', 'slideshare')) {

$search = '/<a\s[^>]*href="(https?:\/\/(www\.)?)(slideshare\.net)\/(.*?)"(.*?)>(.*?)<\/a>/is';

$newtext = preg_replace_callback($search, 'filter_oembed_slidesharecallback', $newtext);

}

if (get_config('filter_oembed', 'officemix')) {

$search = '/<a\s[^>]*href="(https?:\/\/(www\.)?)(mix\.office\.com)\/(.*?)"(.*?)>(.*?)<\/a>/is';

$newtext = preg_replace_callback($search, 'filter_oembed_officemixcallback', $newtext);

}

if (get_config('filter_oembed', 'issuu')) {

$search = '/<a\s[^>]*href="(https?:\/\/(www\.)?)(issuu\.com)\/(.*?)"(.*?)>(.*?)<\/a>/is';

$newtext = preg_replace_callback($search, 'filter_oembed_issuucallback', $newtext);

}

if (get_config('filter_oembed', 'screenr')) {

$search = '/<a\s[^>]*href="(https?:\/\/(www\.)?)(screenr\.com)\/(.*?)"(.*?)>(.*?)<\/a>/is';

$newtext = preg_replace_callback($search, 'filter_oembed_screenrcallback', $newtext);

}

if (get_config('filter_oembed', 'soundcloud')) {

$search = '/<a\s[^>]*href="(https?:\/\/(www\.)?)(soundcloud\.com)\/(.*?)"(.*?)>(.*?)<\/a>/is';

$newtext = preg_replace_callback($search, 'filter_oembed_soundcloudcallback', $newtext);

}

if (get_config('filter_oembed', 'ted')) {

$search = '/<a\s[^>]*href="(https?:\/\/(www\.)?)(ted\.com)\/talks\/(.*?)"(.*?)>(.*?)<\/a>/is';

$newtext = preg_replace_callback($search, 'filter_oembed_tedcallback', $newtext);

}

if (get_config('filter_oembed', 'pollev')) {

$search = '/<a\s[^>]*href="(https?:\/\/(www\.)?)(polleverywhere\.com)\/(polls|multiple_choice_polls|free_text_polls)\/(.*?)"(.*?)>(.*?)<\/a>/is';

$newtext = preg_replace_callback($search, 'filter_oembed_pollevcallback', $newtext);

}

$odburl = get_config('local_o365', 'odburl');

if (get_config('filter_oembed', 'o365video') && !empty($odburl)) {

$odburl = preg_replace('/^https?:\/\//', '', $odburl);

$odburl = preg_replace('/\/.*/', '', $odburl);

$trimedurl = preg_replace("/-my/", "", $odburl);

$search = '/<a\s[^>]*href="(https?:\/\/)('.$odburl.'|'.$trimedurl.')\/(.*?)"(.*?)>(.*?)<\/a>/is';

$newtext = preg_replace_callback($search, 'filter_oembed_o365videocallback', $newtext);

}

if (get_config('filter_oembed', 'sway')) {

$search = '/<a\s[^>]*href="(https?:\/\/(www\.)?)(sway\.com)\/(.*?)"(.*?)>(.*?)<\/a>/is';

$newtext = preg_replace_callback($search, 'filter_oembed_swaycallback', $newtext);

}

if (empty($newtext) or $newtext === $text) {

// Error or not filtered.

unset($newtext);

return $text;

}

return $newtext;

}

global $CFG;

$url = "http://www.youtube.com/oembed?url=".urlencode(trim($link[1]))."&format=json";

$jsonret = filter_oembed_curlcall($url);

return filter_oembed_vidembed($jsonret, trim($link[7]));

global $CFG;

$url = "http://vimeo.com/api/oembed.json?url=".trim($link[1]).trim($link[2]).trim($link[3]).'/'.trim($link[4]).'&maxwidth=480&maxheight=270';

$jsonret = filter_oembed_curlcall($url);

return filter_oembed_vidembed($jsonret);

global $CFG;

$url = "http://www.ted.com/services/v1/oembed.json?url=".trim($link[1]).trim($link[3]).'/talks/'.trim($link[4]).'&maxwidth=480&maxheight=270';

$jsonret = filter_oembed_curlcall($url);

return filter_oembed_vidembed($jsonret);

global $CFG;

$url = "http://www.slideshare.net/api/oembed/2?url=".trim($link[1]).trim($link[3]).'/'.trim($link[4])."&format=json&maxwidth=480&maxheight=270";

$json = filter_oembed_curlcall($url);

return $json === null ? '<h3>'. get_string('connection_error', 'filter_oembed') .'</h3>' : $json['html'];

global $CFG;

$url = "https://mix.office.com/oembed/?url=".trim($link[1]).trim($link[2]).trim($link[3]).'/'.trim($link[4]);

$json = filter_oembed_curlcall($url);

if($json === null){

return '<h3>'. get_string('connection_error', 'filter_oembed') .'</h3>';

}

// Increase the height and width of iframe.

$json['html'] = str_replace('width="348"', 'width="480"', $json['html']);

$json['html'] = str_replace('height="245"', 'height="320"', $json['html']);

$json['html'] = str_replace('height="310"', 'height="410"', $json['html']);

$json['html'] = str_replace('height="267"', 'height="350"', $json['html']);

return filter_oembed_vidembed($json);

global $CFG;

$url = "http://www.polleverywhere.com/services/oembed?url=".trim($link[1]).trim($link[3]).'/'.trim($link[4]).'/'.trim($link[5])."&format=json&maxwidth=480&maxheight=270";

$json = filter_oembed_curlcall($url);

return $json === null ? '<h3>'. get_string('connection_error', 'filter_oembed') .'</h3>' : $json['html'];

global $CFG;

$url = "http://issuu.com/oembed?url=".trim($link[1]).trim($link[3]).'/'.trim($link[4])."&format=json";

$json = filter_oembed_curlcall($url);

return $json === null ? '<h3>'. get_string('connection_error', 'filter_oembed') .'</h3>' : $json['html'];

global $CFG;

$url = "http://www.screenr.com/api/oembed.json?url=".trim($link[1]).trim($link[3]).'/'.trim($link[4]).'&maxwidth=480&maxheight=270';

$json = filter_oembed_curlcall($url);

return filter_oembed_vidembed($json);

global $CFG;

$url = "http://soundcloud.com/oembed?url=".trim($link[1]).trim($link[3]).'/'.trim($link[4])."&format=json&maxwidth=480&maxheight=270'";

$json = filter_oembed_curlcall($url);

return filter_oembed_vidembed($json);

if (empty($link[3])) {

return $link[0];

}

$link[3] = preg_replace("/&amp;/", "&", $link[3]);

$values = array();

parse_str($link[3], $values);

if (empty($values['chid']) || empty($values['vid'])) {

return $link[0];

}

if (!\local_o365\rest\sharepoint::is_configured()) {

\local_o365\utils::debug('filter_oembed share point is not configured', 'filter_oembed_o365videocallback');

return $link[0];

}

try {

$spresource = \local_o365\rest\sharepoint::get_resource();

if (!empty($spresource)) {

$httpclient = new \local_o365\httpclient();

$clientdata = \local_o365\oauth2\clientdata::instance_from_oidc();

$sptoken = \local_o365\oauth2\systemtoken::instance(null, $spresource, $clientdata, $httpclient);

if (!empty($sptoken)) {

$sharepoint = new \local_o365\rest\sharepoint($sptoken, $httpclient);

// Retrieve api url for video service.

$url = $sharepoint->videoservice_discover();

if (!empty($url)) {

$sharepoint->override_resource($url);

$width = 640;

if (!empty($values['width'])) {

$width = $values['width'];

}

$height = 360;

if (!empty($values['height'])) {

$height = $values['height'];

}

// Retrieve embed code.

return $sharepoint->get_video_embed_code($values['chid'], $values['vid'], $width, $height);

}

}

}

} catch (\Exception $e) {

\local_o365\utils::debug('filter_oembed share point execption: '.$e->getMessage(), 'filter_oembed_o365videocallback');

}

return $link[0];

global $CFG;

$width = 500;

$height = 760;

$link[4] = preg_replace("/&amp;/", "&", $link[4]);

$id = preg_replace("/^(.*)(\?(.*)?)/", "$1", $link[4]);

$url = "https://www.sway.com/s/".trim($id)."/embed";

// Check for optional width and height passed as query string.

if (preg_match("/width/", $link[4])) {

$query = array();

parse_str(preg_replace("/^(.*)\?/", "", $link[4]), $query);

if (!empty($query['width'])) {

$width = $query['width'];

}

if (!empty($query['height'])) {

$height = $query['height'];

}

}

$options = array(

'class' => 'oembed_sway',

'width' => $width.'px',

'height' => $height.'px',

'src' => $url,

'frameborder' => '0',

'marginwidth' => '0',

'scrolling' => 'no',

'style' => 'border: none; max-width:100%; max-height:100vh',

'allowfullscreen' => '',

'webkitallowfullscreen' => '',

'msallowfullscreen' => '',

);

return html_writer::tag('iframe', '', $options);

$crl = curl_init();

$timeout = 15;

curl_setopt ($crl, CURLOPT_URL, $www);

curl_setopt ($crl, CURLOPT_RETURNTRANSFER, 1);

curl_setopt ($crl, CURLOPT_CONNECTTIMEOUT, $timeout);

curl_setopt ($crl, CURLOPT_SSL_VERIFYPEER, false);

$ret = curl_exec($crl);

// Check if curl call fails.

if ($ret === false) {

// Check if error is due to network connection.

if (in_array(curl_errno($crl), array('6', '7', '28'))) {

// Try curl call for 3 times pausing 0.5 sec.

for ($i = 0; $i < 3; $i++) {

$ret = curl_exec($crl);

// If we get proper response, break the loop.

if ($ret !== false) {

break;

}

usleep(500000);

}

// If still curl call failing, return null.

if ($ret === false) {

return null;

}

} else {

return null;

}

}

curl_close($crl);

$result = json_decode($ret, true);

return $result;

if ($json === null) {

return '<h3>'. get_string('connection_error', 'filter_oembed') .'</h3>';

}

$embed = $json['html'];

if ($params != ''){

$embed = str_replace('?feature=oembed', '?feature=oembed'.htmlspecialchars($params), $embed );

}

if (get_config('filter_oembed', 'lazyload')) {

$embed = htmlspecialchars($embed);

$dom = new DOMDocument();

// To surpress the loadHTML Warnings.

libxml_use_internal_errors(true);

$dom->loadHTML($json['html']);

libxml_use_internal_errors(false);

// Get height and width of iframe.

$height = $dom->getElementsByTagName('iframe')->item(0)->getAttribute('height');

$width = $dom->getElementsByTagName('iframe')->item(0)->getAttribute('width');

$embedcode = '<a class="lvoembed lvvideo" data-embed="'.$embed.'"';

$embedcode .= 'href="#" data-height="'. $height .'" data-width="'. $width .'"><div class="lazyvideo_container">';

$embedcode .= '<img class="lazyvideo_placeholder" src="'.$json['thumbnail_url'].'" />';

$embedcode .= '<div class="lazyvideo_title"><div class="lazyvideo_text">'.$json['title'].'</div></div>';

$embedcode .= '<span class="lazyvideo_playbutton"></span>';

$embedcode .= '</div></a>';

} else {

$embedcode = $embed;

}

return $embedcode;