+
+ /**
+ * Recursively deletes a folder content, and deletes itself optionally.
+ * If an excluded file is found, folders won't be deleted.
+ *
+ * Additional security: raise an exception if it tries to delete a folder outside of Shaarli directory.
+ *
+ * @param string $path
+ * @param bool $selfDelete Delete the provided folder if true, only its content if false.
+ * @param array $exclude
+ */
+ public static function clearFolder(string $path, bool $selfDelete, array $exclude = []): bool
+ {
+ $skipped = false;
+
+ if (!is_dir($path)) {
+ throw new IOException(t('Provided path is not a directory.'));
+ }
+
+ if (!static::isPathInShaarliFolder($path)) {
+ throw new IOException(t('Trying to delete a folder outside of Shaarli path.'));
+ }
+
+ foreach (new \DirectoryIterator($path) as $file) {
+ if($file->isDot()) {
+ continue;
+ }
+
+ if (in_array($file->getBasename(), $exclude, true)) {
+ $skipped = true;
+ continue;
+ }
+
+ if ($file->isFile()) {
+ unlink($file->getPathname());
+ } elseif($file->isDir()) {
+ $skipped = static::clearFolder($file->getRealPath(), true, $exclude) || $skipped;
+ }
+ }
+
+ if ($selfDelete && !$skipped) {
+ rmdir($path);
+ }
+
+ return $skipped;
+ }
+
+ /**
+ * Checks that the given path is inside Shaarli directory.
+ */
+ public static function isPathInShaarliFolder(string $path): bool
+ {
+ $rootDirectory = dirname(dirname(__FILE__));
+
+ return strpos(realpath($path), $rootDirectory) !== false;
+ }