fix: Properly fetch version from shared files by accessing the owner …

…storage version

Signed-off-by: Julius Härtl <jus@bitgrid.net>

apps/files_versions/lib/Versions/LegacyVersionsBackend.php

@@ -27,6 +27,7 @@
 namespace OCA\Files_Versions\Versions;
 
 use OC\Files\View;
+use OCA\Files_Sharing\ISharedStorage;
 use OCA\Files_Sharing\SharedStorage;
 use OCA\Files_Versions\Db\VersionEntity;
 use OCA\Files_Versions\Db\VersionsMapper;
@@ -196,6 +197,21 @@ public function read(IVersion $version) {
 
  public function getVersionFile(IUser $user, FileInfo $sourceFile, $revision): File {
  $userFolder = $this->rootFolder->getUserFolder($user->getUID());
+ $ownerUserId = $sourceFile->getOwner()?->getUID();
+ $storage = $sourceFile->getStorage();
+
+ if ($storage->instanceOfStorage(ISharedStorage::class) && $ownerUserId) {
+ /** @var SharedStorage $storage */
+ // Shared files have their versions in the owners root folder
+ $userFolder = $this->rootFolder->getUserFolder($ownerUserId);
+ $user = $this->userManager->get($ownerUserId);
+ $ownerPathInStorage = $sourceFile->getInternalPath();
+ $sourceFile = $storage->getShare()->getNode();
+ if ($sourceFile instanceof Folder) {
+ $sourceFile = $sourceFile->get($ownerPathInStorage);
+ }
+ }
+
  $versionFolder = $this->getVersionFolder($user);
  /** @var File $file */
  $file = $versionFolder->get($userFolder->getRelativePath($sourceFile->getPath()) . '.v' . $revision);