Verify the src exists in webdav MOVE

* Unit test added

apps/dav/lib/connector/sabre/filesplugin.php

@@ -132,6 +132,10 @@ class FilesPlugin extends \Sabre\DAV\ServerPlugin {
 		if ($sourceDir !== $destinationDir) {
 			$sourceFileInfo = $this->fileView->getFileInfo($source);
 
+			if ($sourceFileInfo === false) {
+				throw new \Sabre\DAV\Exception\NotFound($source . ' does not exist');
+			}
+
 			if (!$sourceFileInfo->isDeletable()) {
 				throw new \Sabre\DAV\Exception\Forbidden($source . " cannot be deleted");
 			}

apps/dav/tests/unit/connector/sabre/filesplugin.php

@@ -251,4 +251,17 @@ class FilesPlugin extends \Test\TestCase {
 
 		$this->plugin->checkMove('FolderA/test.txt', 'test.txt');
 	}
+
+	/**
+	 * @expectedException \Sabre\DAV\Exception\NotFound
+	 * @expectedExceptionMessage FolderA/test.txt does not exist
+	 */
+	public function testMoveSrcNotExist() {
+		$this->view->expects($this->once())
+			->method('getFileInfo')
+			->with('FolderA/test.txt')
+			->willReturn(false);
+
+		$this->plugin->checkMove('FolderA/test.txt', 'test.txt');
+	}
 }