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124 lines
3.2 KiB
124 lines
3.2 KiB
<?php |
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require(__DIR__ . '/../constants.php'); |
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// Supported types with their associated content type |
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const SUPPORTED_TYPES = [ |
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'css' => 'text/css; charset=UTF-8', |
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'js' => 'application/javascript; charset=UTF-8', |
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'png' => 'image/png', |
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'jpeg' => 'image/jpeg', |
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'jpg' => 'image/jpeg', |
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'gif' => 'image/gif', |
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'svg' => 'image/svg+xml', |
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]; |
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/** |
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* @return string |
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*/ |
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function get_absolute_filename(string $file_name) { |
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$core_extension = realpath(CORE_EXTENSIONS_PATH . '/' . $file_name); |
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if (false !== $core_extension) { |
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return $core_extension; |
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} |
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$extension = realpath(EXTENSIONS_PATH . '/' . $file_name); |
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if (false !== $extension) { |
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return $extension; |
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} |
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$third_party_extension = realpath(THIRDPARTY_EXTENSIONS_PATH . '/' . $file_name); |
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if (false !== $third_party_extension) { |
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return $third_party_extension; |
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} |
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$user = realpath(USERS_PATH . '/' . $file_name); |
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if (false !== $user) { |
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return $user; |
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} |
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return ''; |
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} |
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function is_valid_path_extension($path, $extensionPath, $isStatic = true) { |
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// It must be under the extension path. |
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$real_ext_path = realpath($extensionPath); |
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//Windows compatibility |
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$real_ext_path = str_replace('\\', '/', $real_ext_path); |
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$path = str_replace('\\', '/', $path); |
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$in_ext_path = (substr($path, 0, strlen($real_ext_path)) === $real_ext_path); |
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if (!$in_ext_path) { |
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return false; |
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} |
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// User files do not need further validations |
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if (!$isStatic) { |
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return true; |
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} |
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// Static files to serve must be under a `ext_dir/static/` directory. |
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$path_relative_to_ext = substr($path, strlen($real_ext_path) + 1); |
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list(,$static,$file) = sscanf($path_relative_to_ext, '%[^/]/%[^/]/%s'); |
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if (null === $file || 'static' !== $static) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Check if a file can be served by ext.php. A valid file is under a |
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* CORE_EXTENSIONS_PATH/extension_name/static/ or THIRDPARTY_EXTENSIONS_PATH/extension_name/static/ directory. |
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* |
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* You should sanitize path by using the realpath() function. |
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* |
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* @param $path the path to the file we want to serve. |
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* @return true if it can be served, false otherwise. |
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* |
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*/ |
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function is_valid_path($path) { |
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return is_valid_path_extension($path, CORE_EXTENSIONS_PATH) || is_valid_path_extension($path, THIRDPARTY_EXTENSIONS_PATH) || is_valid_path_extension($path, USERS_PATH, $false); |
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} |
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function sendBadRequestResponse(string $message = null) { |
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header('HTTP/1.1 400 Bad Request'); |
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die($message); |
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} |
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function sendNotFoundResponse() { |
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header('HTTP/1.1 404 Not Found'); |
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die(); |
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} |
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if (!isset($_GET['f']) || |
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!isset($_GET['t'])) { |
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sendBadRequestResponse('Query string is incomplete.'); |
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} |
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$file_name = urldecode($_GET['f']); |
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$file_type = $_GET['t']; |
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if (empty(SUPPORTED_TYPES[$file_type])) { |
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sendBadRequestResponse('File type is not supported.'); |
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} |
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$absolute_filename = get_absolute_filename($file_name); |
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if (!is_valid_path($absolute_filename)) { |
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sendBadRequestResponse('File is not supported.'); |
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} |
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$content_type = SUPPORTED_TYPES[$file_type]; |
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header("Content-Type: {$content_type}"); |
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header("Content-Disposition: inline; filename='{$file_name}'"); |
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$mtime = @filemtime($absolute_filename); |
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if ($mtime === false) { |
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sendNotFoundResponse(); |
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} |
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require(LIB_PATH . '/http-conditional.php'); |
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if (!httpConditional($mtime, 604800, 2)) { |
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readfile($absolute_filename); |
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}
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