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- <?php
- class OpenGraph implements Iterator
- {
-
- public static $TYPES = array(
- 'activity' => array('activity', 'sport'),
- 'business' => array('bar', 'company', 'cafe', 'hotel', 'restaurant'),
- 'group' => array('cause', 'sports_league', 'sports_team'),
- 'organization' => array('band', 'government', 'non_profit', 'school', 'university'),
- 'person' => array('actor', 'athlete', 'author', 'director', 'musician', 'politician', 'public_figure'),
- 'place' => array('city', 'country', 'landmark', 'state_province'),
- 'product' => array('album', 'book', 'drink', 'food', 'game', 'movie', 'product', 'song', 'tv_show'),
- 'website' => array('blog', 'website'),
- );
-
- private $_values = array();
-
- static public function fetch($URI) {
- $curl = curl_init($URI);
- curl_setopt($curl, CURLOPT_FAILONERROR, true);
- curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
- curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
- curl_setopt($curl, CURLOPT_TIMEOUT, 15);
- curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
- curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
- curl_setopt($curl, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
- $response = curl_exec($curl);
- curl_close($curl);
- if (!empty($response)) {
- return self::_parse($response);
- } else {
- return false;
- }
- }
-
- static private function _parse($HTML) {
- $old_libxml_error = libxml_use_internal_errors(true);
- $doc = new DOMDocument();
- $doc->loadHTML($HTML);
- libxml_use_internal_errors($old_libxml_error);
- $tags = $doc->getElementsByTagName('meta');
- if (!$tags || $tags->length === 0) {
- return false;
- }
- $page = new self();
- $nonOgDescription = null;
- foreach ($tags AS $tag) {
- if ($tag->hasAttribute('property') &&
- strpos($tag->getAttribute('property'), 'og:') === 0) {
- $key = strtr(substr($tag->getAttribute('property'), 3), '-', '_');
- $page->_values[$key] = $tag->getAttribute('content');
- }
-
- if ($tag ->hasAttribute('value') && $tag->hasAttribute('property') &&
- strpos($tag->getAttribute('property'), 'og:') === 0) {
- $key = strtr(substr($tag->getAttribute('property'), 3), '-', '_');
- $page->_values[$key] = $tag->getAttribute('value');
- }
- if ($tag->hasAttribute('name') && $tag->getAttribute('name') === 'description') {
- $nonOgDescription = $tag->getAttribute('content');
- }
- }
- if (!isset($page->_values['title'])) {
- $titles = $doc->getElementsByTagName('title');
- if ($titles->length > 0) {
- $page->_values['title'] = $titles->item(0)->textContent;
- }
- }
- if (!isset($page->_values['description']) && $nonOgDescription) {
- $page->_values['description'] = $nonOgDescription;
- }
-
- if (!isset($page->values['image'])) {
- $domxpath = new DOMXPath($doc);
- $elements = $domxpath->query("//link[@rel='image_src']");
- if ($elements->length > 0) {
- $domattr = $elements->item(0)->attributes->getNamedItem('href');
- if ($domattr) {
- $page->_values['image'] = $domattr->value;
- $page->_values['image_src'] = $domattr->value;
- }
- }
- }
- if (empty($page->_values)) { return false; }
- return $page;
- }
-
- public function __get($key) {
- if (array_key_exists($key, $this->_values)) {
- return $this->_values[$key];
- }
- if ($key === 'schema') {
- foreach (self::$TYPES AS $schema => $types) {
- if (array_search($this->_values['type'], $types)) {
- return $schema;
- }
- }
- }
- }
-
- public function keys() {
- return array_keys($this->_values);
- }
-
- public function __isset($key) {
- return array_key_exists($key, $this->_values);
- }
-
- public function hasLocation() {
- if (array_key_exists('latitude', $this->_values) && array_key_exists('longitude', $this->_values)) {
- return true;
- }
- $address_keys = array('street_address', 'locality', 'region', 'postal_code', 'country_name');
- $valid_address = true;
- foreach ($address_keys AS $key) {
- $valid_address = ($valid_address && array_key_exists($key, $this->_values));
- }
- return $valid_address;
- }
-
- private $_position = 0;
- public function rewind() { reset($this->_values); $this->_position = 0; }
- public function current() { return current($this->_values); }
- public function key() { return key($this->_values); }
- public function next() { next($this->_values); ++$this->_position; }
- public function valid() { return $this->_position < sizeof($this->_values); }
- }
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