* * name: Oembed * --- * Oembed: * providers: * 'http://*.youtube.com/watch*': * 'http://www.youtube.com/oembed/' * autodiscover: * true * * * @package framework * @subpackage oembed */ class Oembed { public static function is_enabled() { return Config::inst()->get('Oembed', 'enabled'); } /** * Gets the autodiscover setting from the config. */ public static function get_autodiscover() { return Config::inst()->get('Oembed', 'autodiscover'); } /** * Gets providers from config. */ public static function get_providers() { return Config::inst()->get('Oembed', 'providers'); } /** * Returns an endpoint (a base Oembed URL) from first matching provider. * * @param $url Human-readable URL. * @returns string/bool URL of an endpoint, or false if no matching provider exists. */ protected static function find_endpoint($url) { foreach(self::get_providers() as $scheme=>$endpoint) { if(self::matches_scheme($url, $scheme)) { return $endpoint; } } return false; } /** * Checks the URL if it matches against the scheme (pattern). * * @param $url Human-readable URL to be checked. * @param $scheme Pattern to be matched against. * @returns bool Whether the pattern matches or not. */ protected static function matches_scheme($url, $scheme) { $urlInfo = parse_url($url); $schemeInfo = parse_url($scheme); foreach($schemeInfo as $k=>$v) { if(!array_key_exists($k, $urlInfo)) { return false; } if(strpos($v, '*') !== false) { $v = preg_quote($v, '/'); $v = str_replace('\*', '.*', $v); if($k == 'host') { $v = str_replace('*\.', '*', $v); } if(!preg_match('/' . $v . '/', $urlInfo[$k])) { return false; } } elseif(strcasecmp($urlInfo[$k], $v)) { return false; } } return true; } /** * Performs a HTTP request to the URL and scans the response for resource links * that mention oembed in their type. * * @param $url Human readable URL. * @returns string/bool Oembed URL, or false. */ protected static function autodiscover_from_url($url) { // Fetch the URL (cache for a week by default) $service = new RestfulService($url, 60*60*24*7); $body = $service->request(); if(!$body || $body->isError()) { return false; } $body = $body->getBody(); // Look within the body for an oembed link. $pcreOmbed = '#]+?(?:href=[\'"](.+?)[\'"][^>]+?)' . '?type=["\']application/json\+oembed["\']' . '(?:[^>]+?href=[\'"](.+?)[\'"])?#'; if(preg_match_all($pcreOmbed, $body, $matches, PREG_SET_ORDER)) { $match = $matches[0]; if(!empty($match[1])) { return html_entity_decode($match[1]); } if(!empty($match[2])) { return html_entity_decode($match[2]); } } return false; } /** * Takes the human-readable URL of an embeddable resource and converts it into an * Oembed_Result descriptor (which contains a full Oembed resource URL). * * @param $url Human-readable URL * @param $type ? * @param $options array Options to be used for constructing the resulting descriptor. * @returns Oembed_Result/bool An Oembed descriptor, or false */ public static function get_oembed_from_url($url, $type = false, array $options = array()) { if(!self::is_enabled()) return false; // Find or build the Oembed URL. $endpoint = self::find_endpoint($url); $oembedUrl = false; if(!$endpoint) { if(self::get_autodiscover()) { $oembedUrl = self::autodiscover_from_url($url); } } elseif($endpoint === true) { $oembedUrl = self::autodiscover_from_url($url); } else { // Build the url manually - we gave all needed information. $oembedUrl = Controller::join_links($endpoint, '?format=json&url=' . rawurlencode($url)); } // If autodescovery failed the resource might be a direct link to a file if(!$oembedUrl) { if(File::get_app_category(File::get_file_extension($url)) == "image") { return new Oembed_Result($url, $url, $type, $options); } } if($oembedUrl) { // Inject the options into the Oembed URL. if($options) { if(isset($options['width']) && !isset($options['maxwidth'])) { $options['maxwidth'] = $options['width']; } if(isset($options['height']) && !isset($options['maxheight'])) { $options['maxheight'] = $options['height']; } $oembedUrl = Controller::join_links($oembedUrl, '?' . http_build_query($options, '', '&')); } return new Oembed_Result($oembedUrl, $url, $type, $options); } // No matching Oembed resource found. return false; } public static function handle_shortcode($arguments, $url, $parser, $shortcode) { if(isset($arguments['type'])) { $type = $arguments['type']; unset($arguments['type']); } else { $type = false; } $oembed = self::get_oembed_from_url($url, $type, $arguments); if($oembed && $oembed->exists()) { return $oembed->forTemplate(); } else { return '' . $url . ''; } } } /** * @package framework * @subpackage oembed */ class Oembed_Result extends ViewableData { /** * JSON data fetched from the Oembed URL. * This data is accessed dynamically by getField and hasField. */ protected $data = false; /** * Human readable URL */ protected $origin = false; /** * ? */ protected $type = false; /** * Oembed URL */ protected $url; /** * Class to be injected into the resulting HTML element. */ protected $extraClass; private static $casting = array( 'html' => 'HTMLText', ); public function __construct($url, $origin = false, $type = false, array $options = array()) { $this->url = $url; $this->origin = $origin; $this->type = $type; if(isset($options['class'])) { $this->extraClass = $options['class']; } parent::__construct(); } public function getOembedURL() { return $this->url; } /** * Fetches the JSON data from the Oembed URL (cached). * Only sets the internal variable. */ protected function loadData() { if($this->data !== false) { return; } // Fetch from Oembed URL (cache for a week by default) $service = new RestfulService($this->url, 60*60*24*7); $body = $service->request(); if(!$body || $body->isError()) { $this->data = array(); return; } $body = $body->getBody(); $data = json_decode($body, true); if(!$data) { // if the response is no valid JSON we might have received a binary stream to an image $data = array(); $image = @imagecreatefromstring($body); if($image !== FALSE) { preg_match("/^(http:\/\/)?([^\/]+)/i", $this->url, $matches); $protocoll = $matches[1]; $host = $matches[2]; $data['type'] = "photo"; $data['title'] = basename($this->url) . " ($host)"; $data['url'] = $this->url; $data['provider_url'] = $protocoll.$host; $data['width'] = imagesx($image); $data['height'] = imagesy($image); $data['info'] = _t('UploadField.HOTLINKINFO', 'Info: This image will be hotlinked. Please ensure you have permissions from the' . ' original site creator to do so.'); } } // Convert all keys to lowercase $data = array_change_key_case($data, CASE_LOWER); // Purge everything if the type does not match. if($this->type && $this->type != $data['type']) { $data = array(); } $this->data = $data; } /** * Wrap the check for looking into Oembed JSON within $this->data. */ public function hasField($field) { $this->loadData(); return array_key_exists(strtolower($field), $this->data); } /** * Wrap the field calls to fetch data from Oembed JSON (within $this->data) */ public function getField($field) { $field = strtolower($field); if($this->hasField($field)) { return $this->data[$field]; } } public function forTemplate() { $this->loadData(); switch($this->Type) { case 'video': case 'rich': if($this->extraClass) { return "
$this->HTML
"; } else { return $this->HTML; } break; case 'link': return '' . $this->Title . ''; break; case 'photo': return ""; break; } } public function exists() { $this->loadData(); return count($this->data) > 0; } }