perf: Don't fetch full group information

This is expensive particularly when multiple group backends are enabled

Signed-off-by: Carl Schwan <carlschwan@kde.org>

Author: CarlSchwan

lib/Helper/UserHelper.php

@@ -48,30 +48,16 @@ private function getUser(string $userId): IUser {
 		throw new InternalError('User not found for ' . $userId);
 	}
 
-	/**
-	 * @param string $userId
-	 * @return IGroup[]
-	 * @throws InternalError
-	 */
-	public function getGroupsForUser(string $userId): array {
-		$user = $this->getUser($userId);
-		return $this->groupManager->getUserGroups($user);
-	}
-
 	/**
 	 * @param string $userId
 	 * @return array|null
 	 */
 	public function getGroupIdsForUser(string $userId): ?array {
 		try {
-			$userGroups = $this->getGroupsForUser($userId);
+			$user = $this->getUser($userId);
+			return $this->groupManager->getUserGroupIds($user);
 		} catch (InternalError $e) {
 			return null;
 		}
-
-		$groupArray = array_map(function (IGroup $group) {
-			return $group->getGID();
-		}, $userGroups);
-		return $groupArray;
 	}
 }

lib/Service/PermissionsService.php

@@ -438,9 +438,9 @@ public function canReadShare(Share $share, ?string $userId = null): bool {
 
 		if ($share->getReceiverType() === 'group') {
 			try {
-				$userGroups = $this->userHelper->getGroupsForUser($userId);
-				foreach ($userGroups as $userGroup) {
-					if ($userGroup->getGID() === $share->getReceiver()) {
+				$userGroups = $this->userHelper->getGroupIdsForUser($userId);
+				foreach ($userGroups as $userGroupId) {
+					if ($userGroupId === $share->getReceiver()) {
 						return true;
 					}
 				}

lib/Service/ShareService.php

@@ -234,8 +234,7 @@ private function findElementsSharedWithMe(string $elementType = 'table', ?string
 		try {
 			$shares['user'] = $this->mapper->findAllSharesFor($elementType, [$userId], $userId);
 
-			$userGroups = $this->userHelper->getGroupsForUser($userId);
-			$userGroupIds = array_map(static fn (IGroup $group) => $group->getGid(), $userGroups);
+			$userGroupIds = $this->userHelper->getGroupIdsForUser($userId);
 			$shares['groups'] = $this->mapper->findAllSharesFor($elementType, $userGroupIds, $userId, ShareReceiverType::GROUP);
 
 			$userCircles = $this->circleHelper->getUserCircles($userId);