. * */ namespace Friendica\Util; use Friendica\Content\Text\BBCode; use Friendica\Core\Logger; use Friendica\DI; use GuzzleHttp\Psr7\Uri; /** * Proxy utilities class */ class Proxy { /** * Sizes constants */ const SIZE_MICRO = 'micro'; // 48 const SIZE_THUMB = 'thumb'; // 80 const SIZE_SMALL = 'small'; // 320 const SIZE_MEDIUM = 'medium'; // 640 const SIZE_LARGE = 'large'; // 1024 /** * Pixel Sizes */ const PIXEL_MICRO = 48; const PIXEL_THUMB = 80; const PIXEL_SMALL = 320; const PIXEL_MEDIUM = 640; const PIXEL_LARGE = 1024; /** * Private constructor */ private function __construct () { // No instances from utilities classes } /** * "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 * @param int $uriid * * @return string Proxified HTML code * @throws \Friendica\Network\HTTPException\InternalServerErrorException */ public static function proxifyHtml(string $html, int $uriid): string { $html = str_replace(Strings::normaliseLink(DI::baseUrl()) . '/', DI::baseUrl() . '/', $html); if (!preg_match_all('/(]*src *= *["\'])([^"\']+)(["\'][^>]*>)/siU', $html, $matches, PREG_SET_ORDER)) { return $html; } foreach ($matches as $match) { $html = str_replace($match[0], self::replaceUrl($match, $uriid), $html); } return $html; } /** * Checks if the URL is a local URL. * * @param string $url * * @return boolean * @throws \Friendica\Network\HTTPException\InternalServerErrorException */ public static function isLocalImage(string $url): bool { if (substr($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(string $url): array { try { $uri = new Uri($url); parse_str($uri->getQuery(), $arr); return $arr; } catch (\Throwable $e) { return []; } } /** * 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, int $uriid): string { // 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 $matches[1] . BBCode::proxyUrl(htmlspecialchars_decode($matches[2]), BBCode::INTERNAL, $uriid, Proxy::SIZE_MEDIUM) . $matches[3]; } public static function getPixelsFromSize(string $size): int { switch ($size) { case Proxy::SIZE_MICRO: return Proxy::PIXEL_MICRO; case Proxy::SIZE_THUMB: return Proxy::PIXEL_THUMB; case Proxy::SIZE_SMALL: return Proxy::PIXEL_SMALL; case Proxy::SIZE_MEDIUM: return Proxy::PIXEL_MEDIUM; case Proxy::SIZE_LARGE: return Proxy::PIXEL_LARGE; default: return 0; } } }