fix(Wopi): fall back to super share if share token is not available

On internal shares the controller is called without the share token. But
necessary information, like share attributes, might be necessary to know
and are available from the super share of the SharedMount in that case.

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

Author: blizzz

lib/Controller/WopiController.php

@@ -5,6 +5,7 @@
  */
 namespace OCA\Richdocuments\Controller;
 
+use OCA\Files_Sharing\SharedMount;
 use OCA\Files_Versions\Versions\IVersionManager;
 use OCA\Richdocuments\AppConfig;
 use OCA\Richdocuments\AppInfo\Application;
@@ -219,7 +220,7 @@ public function checkFileInfo(string $fileId, string $access_token): JSONRespons
 			$response['TemplateSource'] = $this->getWopiUrlForTemplate($wopi);
 		}
 
-		$share = $this->getShareForWopiToken($wopi);
+		$share = $this->getShareForWopiToken($wopi, $file);
 		if ($this->permissionManager->shouldWatermark($file, $wopi->getEditorUid(), $share)) {
 			$email = $user !== null && !$isPublic ? $user->getEMailAddress() : '';
 			$currentDateTime = new \DateTime(
@@ -925,9 +926,20 @@ private function getFileForWopiToken(Wopi $wopi) {
 		return array_shift($files);
 	}
 
-	private function getShareForWopiToken(Wopi $wopi): ?IShare {
+	private function getShareForWopiToken(Wopi $wopi, File $file): ?IShare {
 		try {
-			return $wopi->getShare() ? $this->shareManager->getShareByToken($wopi->getShare()) : null;
+			$shareToken = $wopi->getShare();
+			if ($shareToken) {
+				return $this->shareManager->getShareByToken($shareToken);
+			}
+
+			// on internal shares the token is not stored, but we can use the
+			// super share.	It is not a specific share, but a cumulative one and#
+			//carries necessary information
+			$mount = $file->getMountPoint();
+			if ($mount instanceof SharedMount) {
+				return $mount->getShare();
+			}
 		} catch (ShareNotFound) {
 		}