Checksums on chunked files

We should also store checksums on chunked files.
We do not checksum individual chunks but only the final file.

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

@@ -457,6 +457,14 @@ class File extends Node implements IFile {
 
 				$this->fileView->changeLock($targetPath, ILockingProvider::LOCK_SHARED);
 
+				if (isset($request->server['HTTP_OC_CHECKSUM'])) {
+					$checksum = trim($request->server['HTTP_OC_CHECKSUM']);
+					$this->fileView->putFileInfo($targetPath, ['checksum' => $checksum]);
+				} else if ($this->getChecksum() !== NULL && $this->getChecksum() !== '') {
+					$this->fileView->putFileInfo($this->path, ['checksum' => '']);
+				}
+				$this->refreshInfo();
+
 				$this->emitPostHooks($exists, $targetPath);
 
 				$info = $this->fileView->getFileInfo($targetPath);