. * */ namespace Friendica\Util; use Friendica\Core\Logger; use Friendica\Core\System; use Friendica\DI; /** * Proxy utilities class */ class Proxy { /** * Sizes constants */ const SIZE_MICRO = 'micro'; // 48 const SIZE_THUMB = 'thumb'; // 80 const SIZE_SMALL = 'small'; // 300 const SIZE_MEDIUM = 'medium'; // 600 const SIZE_LARGE = 'large'; // 1024 /** * Pixel Sizes */ const PIXEL_MICRO = 48; const PIXEL_THUMB = 80; const PIXEL_SMALL = 300; const PIXEL_MEDIUM = 600; const PIXEL_LARGE = 1024; /** * Accepted extensions * * @var array * @todo Make this configurable? */ private static $extensions = [ 'jpg', 'jpeg', 'gif', 'png', ]; /** * Private constructor */ private function __construct () { // No instances from utilities classes } /** * Transform a remote URL into a local one. * * This function only performs the URL replacement on http URL and if the * provided URL isn't local * * @param string $url The URL to proxyfy * @param string $size One of the ProxyUtils::SIZE_* constants * * @return string The proxyfied URL or relative path * @throws \Friendica\Network\HTTPException\InternalServerErrorException */ public static function proxifyUrl($url, $size = '') { if (!DI::config()->get('system', 'proxify_content')) { return $url; } // Trim URL first $url = trim($url); // Quit if not an HTTP/HTTPS link or if local if (!in_array(parse_url($url, PHP_URL_SCHEME), ['http', 'https']) || self::isLocalImage($url)) { return $url; } // Image URL may have encoded ampersands for display which aren't desirable for proxy $url = html_entity_decode($url, ENT_NOQUOTES, 'utf-8'); $shortpath = hash('md5', $url); $longpath = substr($shortpath, 0, 2); $longpath .= '/' . strtr(base64_encode($url), '+/', '-_'); // Extract the URL extension $extension = pathinfo(parse_url($url, PHP_URL_PATH), PATHINFO_EXTENSION); if (in_array($extension, self::$extensions)) { $shortpath .= '.' . $extension; $longpath .= '.' . $extension; } $proxypath = DI::baseUrl() . '/proxy/' . $longpath; if ($size != '') { $size = ':' . $size; } Logger::info('Created proxy link', ['url' => $url, 'callstack' => System::callstack(20)]); // Too long files aren't supported by Apache if (strlen($proxypath) > 250) { return DI::baseUrl() . '/proxy/' . $shortpath . '?url=' . urlencode($url); } else { return $proxypath . $size; } } /** * "Proxifies" HTML code's image tags * * "Proxifies", means replaces image URLs in given HTML code with those from * proxy storage directory. * * @param string $html Un-proxified HTML code * * @return string Proxified HTML code * @throws \Friendica\Network\HTTPException\InternalServerErrorException */ public static function proxifyHtml($html) { $html = str_replace(Strings::normaliseLink(DI::baseUrl()) . '/', DI::baseUrl() . '/', $html); return preg_replace_callback('/(]*src *= *["\'])([^"\']+)(["\'][^>]*>)/siU', 'self::replaceUrl', $html); } /** * Checks if the URL is a local URL. * * @param string $url * @return boolean * @throws \Friendica\Network\HTTPException\InternalServerErrorException */ public static function isLocalImage($url) { if (substr($url, 0, 1) == '/') { return true; } if (strtolower(substr($url, 0, 5)) == 'data:') { return true; } return Network::isLocalLink($url); } /** * Return the array of query string parameters from a URL * * @param string $url URL to parse * @return array Associative array of query string parameters */ private static function parseQuery($url) { $query = parse_url($url, PHP_URL_QUERY); $query = html_entity_decode($query); parse_str($query, $arr); return $arr; } /** * Call-back method to replace the UR * * @param array $matches Matches from preg_replace_callback() * @return string Proxified HTML image tag * @throws \Friendica\Network\HTTPException\InternalServerErrorException */ private static function replaceUrl(array $matches) { // if the picture seems to be from another picture cache then take the original source $queryvar = self::parseQuery($matches[2]); if (!empty($queryvar['url']) && substr($queryvar['url'], 0, 4) == 'http') { $matches[2] = urldecode($queryvar['url']); } // Following line changed per bug #431 if (self::isLocalImage($matches[2])) { return $matches[1] . $matches[2] . $matches[3]; } // Return proxified HTML return $matches[1] . self::proxifyUrl(htmlspecialchars_decode($matches[2])) . $matches[3]; } }