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<?php |
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declare(strict_types=1); |
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namespace WebThumbnailer\Finder; |
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use WebThumbnailer\Application\ConfigManager; |
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use WebThumbnailer\Application\WebAccess\WebAccess; |
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use WebThumbnailer\Application\WebAccess\WebAccessCUrl; |
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use WebThumbnailer\Application\WebAccess\WebAccessFactory; |
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use WebThumbnailer\Utils\ImageUtils; |
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use WebThumbnailer\Utils\UrlUtils; |
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/** |
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* This finder isn't linked to any domain. |
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* It will return the resource if it is an image (by extension, or by content). |
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* Otherwise, it'll try to retrieve an OpenGraph resource. |
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*/ |
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class DefaultFinder extends FinderCommon |
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{ |
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/** @var WebAccess instance. */ |
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protected $webAccess; |
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/** |
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* @inheritdoc |
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* @param mixed[]|null $rules All existing rules loaded from JSON files. |
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* @param mixed[]|null $options Options provided by the user to retrieve a thumbnail. |
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*/ |
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public function __construct(string $domain, string $url, ?array $rules, ?array $options) |
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{ |
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$this->webAccess = WebAccessFactory::getWebAccess($url); |
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$this->url = $url; |
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$this->domain = $domain; |
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} |
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/** |
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* Generic finder. |
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* |
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* @inheritdoc |
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*/ |
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public function find() |
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{ |
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if (ImageUtils::isImageExtension(UrlUtils::getUrlFileExtension($this->url))) { |
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return $this->url; |
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} |
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$content = $thumbnail = null; |
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$callback = $this->webAccess instanceof WebAccessCUrl |
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? $this->getCurlCallback($content, $thumbnail) |
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: null; |
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list($headers, $content) = $this->webAccess->getContent( |
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$this->url, |
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(int) ConfigManager::get('settings.default.timeout', 30), |
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(int) ConfigManager::get('settings.default.max_img_dl', 16777216), |
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$callback, |
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$content |
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); |
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if (empty($thumbnail) && !empty($content) && ImageUtils::isImageString($content)) { |
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return $this->url; |
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} |
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if (empty($thumbnail) && ! empty($headers) && strpos($headers[0], '200') === false) { |
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return false; |
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} |
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// With curl, the thumb is extracted during the download |
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if ($this->webAccess instanceof WebAccessCUrl && ! empty($thumbnail)) { |
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return $thumbnail; |
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} |
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return ! empty($content) ? static::extractMetaTag($content) : false; |
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} |
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/** |
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* Get a callback for curl write function. |
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* |
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* @param string|null $content A variable reference in which the downloaded content should be stored. |
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* @param string|null $thumbnail A variable reference in which extracted thumb URL should be stored. |
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* |
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* @return callable CURLOPT_WRITEFUNCTION callback |
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*/ |
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protected function getCurlCallback(?string &$content, ?string &$thumbnail): callable |
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{ |
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$url = $this->url; |
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$isRedirected = false; |
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/** |
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* cURL callback function for CURLOPT_WRITEFUNCTION (called during the download). |
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* |
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* While downloading the remote page, we check that the HTTP code is 200 and content type is 'html/text' |
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* Then we extract the title and the charset and stop the download when it's done. |
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* |
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* Note that when using CURLOPT_WRITEFUNCTION, we have to manually handle the content retrieved, |
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* hence the $content reference variable. |
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* |
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* @param resource $ch cURL resource |
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* @param string $data chunk of data being downloaded |
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* |
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* @return int|false length of $data or false if we need to stop the download |
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*/ |
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return function ($ch, $data) use ($url, &$content, &$thumbnail, &$isRedirected) { |
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$content .= $data; |
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$responseCode = curl_getinfo($ch, CURLINFO_RESPONSE_CODE); |
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if (!empty($responseCode) && in_array($responseCode, [301, 302])) { |
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$isRedirected = true; |
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return strlen($data); |
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} |
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if (!empty($responseCode) && $responseCode !== 200) { |
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return false; |
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} |
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// After a redirection, the content type will keep the previous request value |
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// until it finds the next content-type header. |
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if (! $isRedirected || strpos(strtolower($data), 'content-type') !== false) { |
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$contentType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE); |
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} |
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// we look for image, and ignore application/octet-stream, |
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// which is a the default content type for any binary |
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// @see https://developer.mozilla.org/fr/docs/Web/HTTP/Basics_of_HTTP/MIME_types |
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if ( |
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!empty($contentType) |
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&& strpos($contentType, 'image/') !== false |
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&& strpos($contentType, 'application/octet-stream') === false |
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) { |
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$thumbnail = $url; |
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return false; |
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} elseif ( |
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!empty($contentType) |
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&& strpos($contentType, 'text/html') === false |
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&& strpos($contentType, 'application/octet-stream') === false |
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) { |
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return false; |
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} |
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if (empty($thumbnail)) { |
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$thumbnail = DefaultFinder::extractMetaTag($data); |
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} |
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// We got everything we want, stop the download. |
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if (!empty($responseCode) && !empty($contentType) && !empty($thumbnail)) { |
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return false; |
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} |
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return strlen($data); |
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}; |
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} |
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/** |
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* Applies the regexp on the HTML $content to extract the thumb URL. |
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* |
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* @param string $content Downloaded HTML content |
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* |
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* @return string|false Extracted thumb URL or false if not found. |
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*/ |
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public static function extractMetaTag(string $content) |
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{ |
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$propertiesKey = ['property', 'name', 'itemprop']; |
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$properties = implode('|', $propertiesKey); |
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// Try to retrieve OpenGraph image. |
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$ogRegex = '#<meta[^>]+(?:' . $properties . ')=["\']?og:image["\'\s][^>]*content=["\']?(.*?)["\'\s>]#'; |
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// If the attributes are not in the order property => content (e.g. Github) |
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// New regex to keep this readable... more or less. |
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$ogRegexReverse = '#<meta[^>]+content=["\']?([^"\'\s]+)[^>]+(?:' . $properties . ')=["\']?og:image["\'\s/>]#'; |
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if ( |
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preg_match($ogRegex, $content, $matches) > 0 |
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|| preg_match($ogRegexReverse, $content, $matches) > 0 |
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) { |
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return $matches[1]; |
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} |
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return false; |
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} |
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/** @inheritdoc */ |
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public function isHotlinkAllowed(): bool |
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{ |
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return true; |
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} |
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/** @inheritdoc */ |
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public function checkRules(?array $rules): bool |
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{ |
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return true; |
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} |
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/** @inheritdoc */ |
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public function loadRules(?array $rules): void |
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{ |
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} |
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/** @inheritdoc */ |
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public function getName(): string |
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{ |
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return 'default'; |
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} |
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} |
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ArthurHoaro /
web-thumbnailer
