fixup! fix(api): use file id in public session api

Author: max-nextcloud

lib/Context/FileContext.php

@@ -97,6 +97,9 @@ public function buildDocument(): Document {
 		$document->setContextType('file');
 		$document->setContextId($this->getId());
 		$document->setLastSavedVersion(0);
+		$document->setLastSavedVersionTime($file->getMTime());
+		$document->setLastSavedVersionEtag($file->getEtag());
+		$document->setChecksum($this->computeChecksum());
 		// This is a new document - so it needs a fresh base version etag.
 		$document->setBaseVersionEtag(uniqid());
 		return $document;
@@ -157,7 +160,10 @@ public function updateDocument(Document $document): void {
 			return;
 		}
 
-		$document->setChecksum($this->computeChecksum());
+		$fileContent = $file->getContent();
+		$fileChecksum = self::computeCheckSum($fileContent);
+
+		$document->setChecksum($fileChecksum);
 		$document->setLastSavedVersionTime($fileMtime);
 		$document->setLastSavedVersionEtag($fileEtag);
 	}