First Commit

vendor/league/flysystem/src/WhitespacePathNormalizer.php

@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace League\Flysystem;
+
+use function array_pop;
+use function explode;
+use function implode;
+use function preg_match;
+use function str_replace;
+
+class WhitespacePathNormalizer implements PathNormalizer
+{
+    private bool $allowRelativePaths;
+
+    public function __construct(bool $allowRelativePathTraversal = true)
+    {
+        $this->allowRelativePaths = $allowRelativePathTraversal;
+    }
+
+    public function normalizePath(string $path): string
+    {
+        $unixPath = str_replace('\\', '/', $path);
+
+        if (preg_match('#\p{C}+#u', $unixPath)) {
+            throw CorruptedPathDetected::forPath($path);
+        }
+
+        $parts = [];
+
+        foreach (explode('/', $unixPath) as $part) {
+            switch ($part) {
+                case '':
+                case '.':
+                    break;
+
+                case '..':
+                    if ($this->allowRelativePaths === false || empty($parts)) {
+                        throw PathTraversalDetected::forPath($path);
+                    }
+
+                    array_pop($parts);
+                    break;
+
+                default:
+                    $parts[] = $part;
+                    break;
+            }
+        }
+
+        return implode('/', $parts);
+    }
+}