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<?php |
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namespace SilverStripe\Core; |
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use InvalidArgumentException; |
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/** |
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* Path manipulation helpers |
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*/ |
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class Path |
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{ |
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const TRIM_CHARS = ' /\\'; |
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/** |
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* Joins one or more paths, normalising all separators to DIRECTORY_SEPARATOR |
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* |
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* Note: Errors on collapsed `/../` for security reasons. Use realpath() if you need to |
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* join a trusted relative path. |
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* @link https://www.owasp.org/index.php/Testing_Directory_traversal/file_include_(OTG-AUTHZ-001) |
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* @see File::join_paths() for joining file identifiers |
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* |
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* @param array $parts |
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* @return string Combined path, not including trailing slash (unless it's a single slash) |
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*/ |
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public static function join(...$parts) |
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{ |
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// In case $parts passed as an array in first parameter |
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if (count($parts) === 1 && is_array($parts[0])) { |
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$parts = $parts[0]; |
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} |
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// Cleanup and join all parts |
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$parts = array_filter(array_map('trim', $parts)); |
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$fullPath = static::normalise(implode(DIRECTORY_SEPARATOR, $parts)); |
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// Protect against directory traversal vulnerability (OTG-AUTHZ-001) |
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if (strpos($fullPath, '..') !== false) { |
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throw new InvalidArgumentException('Can not collapse relative folders'); |
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} |
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return $fullPath ?: DIRECTORY_SEPARATOR; |
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} |
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/** |
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* Normalise absolute or relative filesystem path. |
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* Important: Single slashes are converted to empty strings (empty relative paths) |
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* |
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* @param string $path Input path |
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* @param bool $relative |
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* @return string Path with no trailing slash. If $relative is true, also trim leading slashes |
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*/ |
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public static function normalise($path, $relative = false) |
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{ |
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$path = trim(Convert::slashes($path)); |
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if ($relative) { |
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return trim($path, self::TRIM_CHARS); |
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} else { |
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return rtrim($path, self::TRIM_CHARS); |
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} |
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} |
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} |
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silverstripe /
silverstripe-framework
