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<?php |
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|
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namespace FluentCommunity\App\Services; |
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|
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class RemoteUrlParser |
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{ |
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|
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private static $instance; |
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|
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/* |
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* Create a method to call the getInfoFromRemoteUrl static method as magic method |
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*/ |
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public static function parse($url) |
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{ |
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if (!self::$instance) { |
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self::$instance = new self(); |
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} |
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|
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$oEmbed = self::$instance->getOembed($url); |
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|
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if ($oEmbed) { |
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return $oEmbed; |
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} |
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|
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return self::$instance->getInfoFromRemoteUrl($url); |
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} |
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|
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public function getOembed($url) |
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{ |
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$supportedDomains = [ |
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'youtube.com', |
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'youtu.be', |
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'vimeo.com', |
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'dailymotion.com', |
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'wordpress.tv', |
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'screencast.com', |
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]; |
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|
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|
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// Using regex to check if the $url is matched with any of the supported domains |
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$pattern = '#https?://(?:www\.)?(' . implode('|', $supportedDomains) . ')/#i'; |
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if (!preg_match($pattern, $url)) { |
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return null; |
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} |
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|
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$data = (new \WP_oEmbed())->get_data($url); |
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|
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if (!$data || is_wp_error($data) || empty($data->provider_name)) { |
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return null; |
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} |
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|
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return array_filter([ |
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'title' => $data->title, |
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'author_name' => $data->author_name, |
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'type' => 'oembed', |
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'provider' => strtolower($data->provider_name), |
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'content_type' => $data->type, |
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'url' => $url, |
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'html' => $data->html, |
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'image' => $data->thumbnail_url, |
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]); |
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} |
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|
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public function getInfoFromRemoteUrl($url) |
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{ |
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$url = untrailingslashit($url); |
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|
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if (empty($url)) { |
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return new \WP_Error('rest_invalid_url', __('Invalid URL'), array('status' => 404)); |
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} |
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|
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$cacheKey = 'fcom_url_details_meta_' . md5($url); |
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$cachedReponse = wp_cache_get($cacheKey, 'fluent-community'); |
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|
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if ($cachedReponse) { |
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return $cachedReponse; |
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} |
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|
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$remote_url_response = $this->getRemoteBody($url); |
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if (is_wp_error($remote_url_response) || empty($remote_url_response)) { |
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return $remote_url_response; |
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} |
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$html_head = $this->getDocumentHead($remote_url_response); |
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|
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$title = $this->getTitle($html_head); |
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if (!$title) { |
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return new \WP_Error('rest_invalid_url', __('Invalid URL'), array('status' => 404)); |
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} |
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|
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$meta_elements = $this->getMetaWithContentElements($html_head); |
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$data = array_filter([ |
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'title' => $title, |
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'image' => $this->getImage($meta_elements, $url), |
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'description' => $this->getDescription($meta_elements), |
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'icon' => $this->getIcon($html_head, $url), |
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'type' => 'meta_data', |
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'url' => $url |
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]); |
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|
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wp_cache_set($cacheKey, $data, 'fluent-community', apply_filters('rest_url_details_cache_expiration', HOUR_IN_SECONDS)); |
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|
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return $data; |
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} |
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|
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private function getRemoteBody($url) |
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{ |
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$modified_user_agent = 'WP-URLDetails/' . get_bloginfo('version') . ' (+' . get_bloginfo('url') . ')'; |
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|
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$args = array( |
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'limit_response_size' => 300 * KB_IN_BYTES, |
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'user-agent' => $modified_user_agent, |
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); |
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|
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/** |
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* Filters the HTTP request args for URL data retrieval. |
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* |
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* Can be used to adjust response size limit and other WP_Http::request() args. |
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* |
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* @param array $args Arguments used for the HTTP request. |
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* @param string $url The attempted URL. |
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* @since 5.9.0 |
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* |
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*/ |
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$args = apply_filters('rest_url_details_http_request_args', $args, $url); |
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|
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$response = wp_safe_remote_get($url, $args); |
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|
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if (\WP_Http::OK !== wp_remote_retrieve_response_code($response)) { |
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// Not saving the error response to cache since the error might be temporary. |
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return new \WP_Error( |
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'no_response', |
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__('URL not found. Response returned a non-200 status code for this URL.'), |
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array('status' => \WP_Http::NOT_FOUND) |
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); |
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} |
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|
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$remote_body = wp_remote_retrieve_body($response); |
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|
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if (empty($remote_body)) { |
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return new \WP_Error( |
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'no_content', |
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__('Unable to retrieve body from response at this URL.'), |
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array('status' => \WP_Http::NOT_FOUND) |
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); |
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} |
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|
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return $remote_body; |
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} |
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|
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private function getDocumentHead($html) |
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{ |
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$head_html = $html; |
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|
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// Find the opening `<head>` tag. |
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$head_start = strpos($html, '<head'); |
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if (false === $head_start) { |
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// Didn't find it. Return the original HTML. |
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return $html; |
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} |
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|
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// Find the closing `</head>` tag. |
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$head_end = strpos($head_html, '</head>'); |
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if (false === $head_end) { |
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// Didn't find it. Find the opening `<body>` tag. |
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$head_end = strpos($head_html, '<body'); |
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|
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// Didn't find it. Return the original HTML. |
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if (false === $head_end) { |
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return $html; |
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} |
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} |
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|
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// Extract the HTML from opening tag to the closing tag. Then add the closing tag. |
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$head_html = substr($head_html, $head_start, $head_end); |
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$head_html .= '</head>'; |
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|
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return $head_html; |
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} |
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|
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private function getDescription($meta_elements) |
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{ |
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// Bail out if there are no meta elements. |
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if (empty($meta_elements[0])) { |
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return ''; |
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} |
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|
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$description = $this->getMetadataFromMetaElement( |
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$meta_elements, |
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'name', |
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'(?:description|og:description)' |
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); |
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|
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// Bail out if description not found. |
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if ('' === $description) { |
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return ''; |
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} |
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|
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return $this->prepare_metadata_for_output($description); |
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} |
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|
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private function getImage($meta_elements, $url) |
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{ |
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$image = $this->getMetadataFromMetaElement( |
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$meta_elements, |
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'property', |
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'(?:og:image|og:image:url)' |
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); |
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|
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// Bail out if image not found. |
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if ('' === $image) { |
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return ''; |
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} |
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|
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// Attempt to convert relative URLs to absolute. |
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$parsed_url = wp_parse_url($url); |
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if (isset($parsed_url['scheme']) && isset($parsed_url['host'])) { |
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$root_url = $parsed_url['scheme'] . '://' . $parsed_url['host'] . '/'; |
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$image = \WP_Http::make_absolute_url($image, $root_url); |
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} |
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|
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return $image; |
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} |
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|
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private function getTitle($html) |
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{ |
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if (!$html) { |
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return ''; |
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} |
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|
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$pattern = '#<title[^>]*>(.*?)<\s*/\s*title>#is'; |
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preg_match($pattern, $html, $match_title); |
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|
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if (empty($match_title[1]) || !is_string($match_title[1])) { |
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return ''; |
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} |
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|
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$title = trim($match_title[1]); |
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|
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return $this->prepare_metadata_for_output($title); |
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} |
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|
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private function getMetaWithContentElements($html) |
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{ |
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$pattern = '#<meta\s' . |
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'[^>]*' . |
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'content=(["\']??)(.*)\1' . |
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'[^>]*' . |
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'\/?>#' . |
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'isU'; |
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|
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preg_match_all($pattern, $html, $elements); |
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|
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return $elements; |
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} |
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|
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private function prepare_metadata_for_output($metadata) |
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{ |
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$metadata = html_entity_decode($metadata, ENT_QUOTES, get_bloginfo('charset')); |
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$metadata = wp_strip_all_tags($metadata); |
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return $metadata; |
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} |
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|
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private function getMetadataFromMetaElement($meta_elements, $attr, $attr_value) |
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{ |
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// Bail out if there are no meta elements. |
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if (empty($meta_elements[0])) { |
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return ''; |
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} |
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|
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$metadata = ''; |
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$pattern = '#' . |
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$attr . '=([\"\']??)\s*' . $attr_value . '\s*\1' . |
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'#isU'; |
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|
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foreach ($meta_elements[0] as $index => $element) { |
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preg_match($pattern, $element, $match); |
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|
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if (empty($match)) { |
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continue; |
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} |
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|
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if (isset($meta_elements[2][$index]) && is_string($meta_elements[2][$index])) { |
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$metadata = trim($meta_elements[2][$index]); |
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} |
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|
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break; |
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} |
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|
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return $metadata; |
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} |
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|
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private function getIcon($html, $url) |
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{ |
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// Grab the icon's link element. |
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$pattern = '#<link\s[^>]*rel=(?:[\"\']??)\s*(?:icon|shortcut icon|icon shortcut)\s*(?:[\"\']??)[^>]*\/?>#isU'; |
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preg_match($pattern, $html, $element); |
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if (empty($element[0]) || !is_string($element[0])) { |
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return ''; |
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} |
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$element = trim($element[0]); |
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|
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// Get the icon's href value. |
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$pattern = '#href=([\"\']??)([^\" >]*?)\\1[^>]*#isU'; |
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preg_match($pattern, $element, $icon); |
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if (empty($icon[2]) || !is_string($icon[2])) { |
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return ''; |
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} |
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$icon = trim($icon[2]); |
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|
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// If the icon is a data URL, return it. |
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$parsed_icon = wp_parse_url($icon); |
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if (isset($parsed_icon['scheme']) && 'data' === $parsed_icon['scheme']) { |
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return $icon; |
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} |
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|
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// Attempt to convert relative URLs to absolute. |
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if (!is_string($url) || '' === $url) { |
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return $icon; |
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} |
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|
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$parsed_url = wp_parse_url($url); |
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if (isset($parsed_url['scheme']) && isset($parsed_url['host'])) { |
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$root_url = $parsed_url['scheme'] . '://' . $parsed_url['host'] . '/'; |
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$icon = \WP_Http::make_absolute_url($icon, $root_url); |
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} |
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|
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return $icon; |
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} |
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} |
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|
