handle error if we can't handle the given path

apps/files_encryption/lib/helper.php

@@ -201,7 +201,7 @@ class Helper {
 		$split = explode('/', $trimmed);
 		
 		// it is not a file relative to data/user/files
-		if ($split[1] !== 'files') {
+		if (count($split) < 3 || $split[1] !== 'files') {
 			return false;
 		}
 		
@@ -220,7 +220,7 @@ class Helper {
 		$trimmed = ltrim($path, '/');
 		$split = explode('/', $trimmed);
 		
-		if ($split[1] !== "files_versions") {
+		if (count($split) < 3 || $split[1] !== "files_versions") {
 			return false;
 		}
 		

apps/files_encryption/lib/stream.php

@@ -107,6 +107,11 @@ class Stream {
 			$this->relPath = Helper::getPathToRealFile($this->rawPath);
 		}
 		
+		if($this->relPath === false) {
+			\OCP\Util::writeLog('Encryption library', 'failed to open file "' . $this->rawPath . '" expecting a path to user/files or to user/files_versions', \OCP\Util::ERROR);
+			return false;
+		}
+		
 		// Disable fileproxies so we can get the file size and open the source file without recursive encryption
 		$proxyStatus = \OC_FileProxy::$enabled;
 		\OC_FileProxy::$enabled = false;