+<?php
+
+namespace BookStack\Activity\Notifications\Handlers;
+
+use BookStack\Activity\Notifications\Messages\BaseActivityNotification;
+use BookStack\Entities\Models\Entity;
+use BookStack\Permissions\PermissionApplicator;
+use BookStack\Users\Models\User;
+
+abstract class BaseNotificationHandler implements NotificationHandler
+{
+ public function __construct(
+ protected PermissionApplicator $permissionApplicator
+ ) {
+ }
+
+ /**
+ * @param class-string<BaseActivityNotification> $notification
+ * @param int[] $userIds
+ */
+ protected function sendNotificationToUserIds(string $notification, array $userIds, User $initiator, Entity $relatedModel): void
+ {
+ $users = User::query()->whereIn('id', array_unique($userIds))->get();
+
+ foreach ($users as $user) {
+ // Prevent sending to the user that initiated the activity
+ if ($user->id === $initiator->id) {
+ continue;
+ }
+
+ // Prevent sending of the user does not have notification permissions
+ if (!$user->can('receive-notifications')) {
+ continue;
+ }
+
+ // Prevent sending if the user does not have access to the related content
+ if (!$this->permissionApplicator->checkOwnableUserAccess($relatedModel, 'view')) {
+ continue;
+ }
+
+ // Send the notification
+ $user->notify(new $notification($relatedModel, $initiator));
+ }
+ }
+}