Recursively fetch subshares

Signed-off-by: Louis Chemineau <louis@chmn.me>

apps/files_sharing/lib/Updater.php

@@ -69,9 +69,7 @@ class Updater {
 		$shares = array_merge($shares, $shareManager->getSharesBy($userFolder->getOwner()->getUID(), IShare::TYPE_ROOM, $src, false, -1));
 
 		if ($src instanceof Folder) {
-			// also check children
-			$subShares = $shareManager->getSharesInFolder($userFolder->getOwner()->getUID(), $src, false);
-			// flatten the result
+			$subShares = $shareManager->getSharesInFolderRecursive($userFolder->getOwner()->getUID(), $src, false);
 			foreach ($subShares as $subShare) {
 				$shares = array_merge($shares, array_values($subShare));
 			}

lib/private/Share20/Manager.php

@@ -1319,6 +1319,24 @@ class Manager implements IManager {
 		}, []);
 	}
 
+	public function getSharesInFolderRecursive(string $userId, Folder $node, $reshares = false) {
+		$shares = $this->getSharesInFolder($userId, $node, $reshares);
+
+		foreach ($node->getDirectoryListing() as $subnode) {
+			if (!$subnode instanceof Folder) {
+				continue;
+			}
+
+			$subShares = $this->getSharesInFolderRecursive($userId, $subnode, $reshares);
+
+			foreach ($subShares as $fileId => $subSharesForFile) {
+				$shares[$fileId] = array_merge($shares[$fileId] ?? [], $subSharesForFile);
+			}
+		}
+
+		return $shares;
+	}
+
 	/**
 	 * @inheritdoc
 	 */

lib/public/Share/IManager.php

@@ -140,6 +140,14 @@ interface IManager {
 	 */
 	public function getSharesInFolder($userId, Folder $node, $reshares = false);
 
+	/**
+	 * Recursively get all shares shared by (initiated) by the provided user in a folder.
+	 *
+	 * @return IShare[][] [$fileId => IShare[], ...]
+	 * @since 11.0.0
+	 */
+	public function getSharesInFolderRecursive(string $userId, Folder $node, bool $reshares = false);
+
 	/**
 	 * Get shares shared by (initiated) by the provided user.
 	 *