getBasePath() . '/proxy'; $shortpath = hash('md5', $url); $longpath = substr($shortpath, 0, 2); if (is_dir($basepath) && $writemode && !is_dir($basepath . '/' . $longpath)) { mkdir($basepath . '/' . $longpath); chmod($basepath . '/' . $longpath, 0777); } $longpath .= '/' . strtr(base64_encode($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 = ':' . $size; } // Too long files aren't supported by Apache // Writemode in combination with long files shouldn't be possible if ((strlen($proxypath) > 250) && $writemode) { return $shortpath; } elseif (strlen($proxypath) > 250) { return DI::baseUrl() . '/proxy/' . $shortpath . '?url=' . urlencode($url); } elseif ($writemode) { return $longpath; } else { return $proxypath . $size; } } /** * @brief "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); } /** * @brief Checks if the URL is a local URL. * * @param string $url * @return boolean * @throws \Friendica\Network\HTTPException\InternalServerErrorException */ private static function isLocalImage($url) { if (substr($url, 0, 1) == '/') { return true; } if (strtolower(substr($url, 0, 5)) == 'data:') { return true; } // links normalised - bug #431 $baseurl = Strings::normaliseLink(DI::baseUrl()); $url = Strings::normaliseLink($url); return (substr($url, 0, strlen($baseurl)) == $baseurl); } /** * @brief 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; } /** * @brief 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]; } }