name : WhitespacePathNormalizer.php <?php declare(strict_types=1); namespace League\Flysystem; class WhitespacePathNormalizer implements PathNormalizer { public function normalizePath(string $path): string { $path = str_replace('\\', '/', $path); $this->rejectFunkyWhiteSpace($path); return $this->normalizeRelativePath($path); } private function rejectFunkyWhiteSpace(string $path): void { if (preg_match('#\p{C}+#u', $path)) { throw CorruptedPathDetected::forPath($path); } } private function normalizeRelativePath(string $path): string { $parts = []; foreach (explode('/', $path) as $part) { switch ($part) { case '': case '.': break; case '..': if (empty($parts)) { throw PathTraversalDetected::forPath($path); } array_pop($parts); break; default: $parts[] = $part; break; } } return implode('/', $parts); } }