fix(dav): Use share initiator to get the share node, because the owner might on another server

Signed-off-by: provokateurin <kate@provokateurin.de>

Author: provokateurin

apps/dav/appinfo/v1/publicwebdav.php

@@ -87,7 +87,6 @@ function (\Sabre\DAV\Server $server) use (
 		}
 
 		$share = $authBackend->getShare();
-		$owner = $share->getShareOwner();
 		$isReadable = $share->getPermissions() & Constants::PERMISSION_READ;
 		$fileId = $share->getNodeId();
 
@@ -102,7 +101,7 @@ function (\Sabre\DAV\Server $server) use (
 		Filesystem::logWarningWhenAddingStorageWrapper($previousLog);
 
 		$rootFolder = Server::get(IRootFolder::class);
-		$userFolder = $rootFolder->getUserFolder($owner);
+		$userFolder = $rootFolder->getUserFolder($share->getSharedBy());
 		$node = $userFolder->getFirstNodeById($fileId);
 		if (!$node) {
 			throw new \Sabre\DAV\Exception\NotFound();

apps/dav/appinfo/v2/publicremote.php

@@ -94,7 +94,6 @@
 	}
 
 	$share = $authBackend->getShare();
-	$owner = $share->getShareOwner();
 	$isReadable = $share->getPermissions() & Constants::PERMISSION_READ;
 	$fileId = $share->getNodeId();
 
@@ -130,7 +129,7 @@
 	Filesystem::logWarningWhenAddingStorageWrapper($previousLog);
 
 	$rootFolder = Server::get(IRootFolder::class);
-	$userFolder = $rootFolder->getUserFolder($owner);
+	$userFolder = $rootFolder->getUserFolder($share->getSharedBy());
 	$node = $userFolder->getFirstNodeById($fileId);
 	if (!$node) {
 		throw new NotFound();

apps/dav/lib/Files/Sharing/PublicLinkCheckPlugin.php

@@ -41,7 +41,7 @@ public function initialize(\Sabre\DAV\Server $server) {
 	}
 
 	public function beforeMethod(RequestInterface $request, ResponseInterface $response) {
-		// verify that the owner didn't have their share permissions revoked
+		// verify that the initiator didn't have their share permissions revoked
 		if ($this->fileInfo && !$this->fileInfo->isShareable()) {
 			throw new NotFound();
 		}