From d6f671722e95f97668970b89dc70aca61b71e539 Mon Sep 17 00:00:00 2001
From: iszmais <iszmais@databay.de>
Date: Mon, 7 Sep 2026 14:43:08 +0200
Subject: [PATCH] add push notifications to the forum

---
 components/ILIAS/Forum/Forum.php              |   2 +
 .../class.ilForumPushProvider.php             | 211 ++++++++++++++++++
 .../classes/class.ilForumAppEventListener.php |   3 +
 lang/ilias_de.lang                            |   1 +
 lang/ilias_en.lang                            |   1 +
 5 files changed, 218 insertions(+)
 create mode 100644 components/ILIAS/Forum/classes/Notification/class.ilForumPushProvider.php

diff --git a/components/ILIAS/Forum/Forum.php b/components/ILIAS/Forum/Forum.php
index 0d79bcdc6cc0..1821c782628a 100644
--- a/components/ILIAS/Forum/Forum.php
+++ b/components/ILIAS/Forum/Forum.php
@@ -40,5 +40,7 @@ public function init(
             new Component\Resource\ComponentJS($this, "autosave_forum.js");
         $contribute[Component\Resource\PublicAsset::class] = fn() =>
         new Component\Resource\ComponentCSS($this, "forum_table.css");
+        $contribute[\ILIAS\Notifications\Interfaces\PushProviderInterface::class] = static fn() =>
+            new \ilForumPushProvider();
     }
 }
diff --git a/components/ILIAS/Forum/classes/Notification/class.ilForumPushProvider.php b/components/ILIAS/Forum/classes/Notification/class.ilForumPushProvider.php
new file mode 100644
index 000000000000..694a658b69eb
--- /dev/null
+++ b/components/ILIAS/Forum/classes/Notification/class.ilForumPushProvider.php
@@ -0,0 +1,211 @@
+<?php
+
+/**
+ * This file is part of ILIAS, a powerful learning management system
+ * published by ILIAS open source e-Learning e.V.
+ *
+ * ILIAS is licensed with the GPL-3.0,
+ * see https://www.gnu.org/licenses/gpl-3.0.en.html
+ * You should have received a copy of said license along with the
+ * source code, too.
+ *
+ * If this is not the case or you just want to try ILIAS, you'll find
+ * us at:
+ * https://www.ilias.de
+ * https://github.com/ILIAS-eLearning
+ *
+ *********************************************************************/
+
+declare(strict_types=1);
+
+use ILIAS\Notifications\Interfaces\PushProviderInterface;
+use ILIAS\Notifications\Model\ilNotificationLink;
+use ILIAS\Notifications\Model\ilNotificationParameter;
+use ILIAS\Notifications\Provider\NotificationsPushProvider;
+
+final class ilForumPushProvider implements PushProviderInterface
+{
+    public const string IDENTIFIER = 'forum';
+
+    private ?NotificationsPushProvider $push_provider = null;
+
+    public function getIdentifier(): string
+    {
+        return self::IDENTIFIER;
+    }
+
+    public function getName(ilLanguage $lng): string
+    {
+        $lng->loadLanguageModule('forum');
+
+        return $lng->txt('forum');
+    }
+
+    public function getDescription(ilLanguage $lng): string
+    {
+        $lng->loadLanguageModule('forum');
+
+        return $lng->txt('forums_forum_push_notification_desc');
+    }
+
+    /**
+     * @param int[] $recipients
+     * @return int[]
+     */
+    public function filterMailRecipients(
+        array $recipients,
+        ilForumNotificationMailData $provider,
+        int $notification_type,
+        ilLogger $logger
+    ): array {
+        global $DIC;
+
+        if (!$DIC->settings()->get('forum_notification', '0')) {
+            return [];
+        }
+
+        $mail_recipients = [];
+
+        foreach ($recipients as $recipient_id) {
+            if ($this->sendPush($recipient_id, $provider, $notification_type)) {
+                $logger->debug(sprintf('Push notification sent to user "%s".', $recipient_id));
+                continue;
+            }
+
+            $mail_recipients[] = $recipient_id;
+        }
+
+        return $mail_recipients;
+    }
+
+    private function sendPush(
+        int $recipient_id,
+        ilForumNotificationMailData $provider,
+        int $notification_type
+    ): bool {
+        $user = ilObjectFactory::getInstanceByObjId($recipient_id, false);
+        if (!$user instanceof ilObjUser) {
+            return false;
+        }
+
+        $lng = ilLanguageFactory::_getLanguageOfUser($recipient_id);
+        $lng->loadLanguageModule('forum');
+
+        $content = $this->buildPushContent($provider, $notification_type, $lng);
+        if ($content === null) {
+            return false;
+        }
+
+        return $this->getPushProvider()->push(
+            $user,
+            $content['title'],
+            $content['description'],
+            $this->buildPushLink($provider)
+        );
+    }
+
+    /**
+     * @return array{title: string, description: string}|null
+     */
+    private function buildPushContent(
+        ilForumNotificationMailData $provider,
+        int $notification_type,
+        ilLanguage $lng
+    ): ?array {
+        $subject_key = $this->getSubjectLanguageKey($notification_type);
+        if ($subject_key === null) {
+            return null;
+        }
+
+        $container_text = '';
+        if ($provider->providesClosestContainer()) {
+            $container_text = ' (' .
+                $lng->txt('frm_noti_obj_' . $provider->closestContainer()->getType()) .
+                ' "' . $provider->closestContainer()->getTitle() . '")';
+        }
+
+        $title = sprintf(
+            $lng->txt($subject_key),
+            $provider->getForumTitle(),
+            $container_text,
+            $provider->getThreadTitle()
+        );
+
+        $description = match ($notification_type) {
+            ilForumMailNotification::TYPE_THREAD_DELETED => sprintf(
+                $lng->txt('thread_deleted_by'),
+                $provider->getDeletedBy(),
+                $provider->getForumTitle()
+            ),
+            ilForumMailNotification::TYPE_POST_NEW => sprintf(
+                $lng->txt('frm_noti_new_post'),
+                $provider->getForumTitle()
+            ),
+            ilForumMailNotification::TYPE_POST_ACTIVATION => $lng->txt('forums_post_activation_mail'),
+            ilForumMailNotification::TYPE_POST_ANSWERED => $lng->txt('forum_post_replied'),
+            ilForumMailNotification::TYPE_POST_UPDATED => sprintf(
+                $lng->txt('post_updated_by'),
+                $provider->getPostUpdateUserName($lng),
+                $provider->getForumTitle()
+            ),
+            ilForumMailNotification::TYPE_POST_CENSORED => sprintf(
+                $lng->txt('post_censored_by'),
+                $provider->getPostUpdateUserName($lng),
+                $provider->getForumTitle()
+            ),
+            ilForumMailNotification::TYPE_POST_UNCENSORED => sprintf(
+                $lng->txt('post_uncensored_by'),
+                $provider->getPostUpdateUserName($lng)
+            ),
+            ilForumMailNotification::TYPE_POST_DELETED => sprintf(
+                $lng->txt('post_deleted_by'),
+                $provider->getDeletedBy(),
+                $provider->getForumTitle()
+            ),
+            default => null,
+        };
+
+        if ($description === null) {
+            return null;
+        }
+
+        return [
+            'title' => $title,
+            'description' => $description,
+        ];
+    }
+
+    private function getSubjectLanguageKey(int $notification_type): ?string
+    {
+        return match ($notification_type) {
+            ilForumMailNotification::TYPE_THREAD_DELETED => 'frm_noti_subject_del_thread',
+            ilForumMailNotification::TYPE_POST_NEW => 'frm_noti_subject_new_post',
+            ilForumMailNotification::TYPE_POST_ACTIVATION => 'frm_noti_subject_act_post',
+            ilForumMailNotification::TYPE_POST_ANSWERED => 'frm_noti_subject_answ_post',
+            ilForumMailNotification::TYPE_POST_UPDATED => 'frm_noti_subject_upt_post',
+            ilForumMailNotification::TYPE_POST_CENSORED => 'frm_noti_subject_cens_post',
+            ilForumMailNotification::TYPE_POST_UNCENSORED => 'frm_noti_subject_uncens_post',
+            ilForumMailNotification::TYPE_POST_DELETED => 'frm_noti_subject_del_post',
+            default => null,
+        };
+    }
+
+    private function buildPushLink(ilForumNotificationMailData $provider): ilNotificationLink
+    {
+        $url = rtrim(ilUtil::_getHttpPath(), '/') . '/goto.php?target=frm_' . implode('_', [
+            $provider->getRefId(),
+            $provider->getThreadId(),
+            $provider->getPostId(),
+        ]) . '&client_id=' . CLIENT_ID;
+
+        return new ilNotificationLink(
+            new ilNotificationParameter('forums_notification_show_post', [], 'forum'),
+            $url
+        );
+    }
+
+    private function getPushProvider(): NotificationsPushProvider
+    {
+        return $this->push_provider ??= new NotificationsPushProvider($this);
+    }
+}
diff --git a/components/ILIAS/Forum/classes/class.ilForumAppEventListener.php b/components/ILIAS/Forum/classes/class.ilForumAppEventListener.php
index f5a6380be8bc..58f4a119059a 100755
--- a/components/ILIAS/Forum/classes/class.ilForumAppEventListener.php
+++ b/components/ILIAS/Forum/classes/class.ilForumAppEventListener.php
@@ -546,6 +546,9 @@ public static function sendNotification(
                 );
             }
 
+            $pushProvider = new ilForumPushProvider();
+            $recipients = $pushProvider->filterMailRecipients($recipients, $provider, $notificationTypes, $logger);
+
             $mailNotification = new ilForumMailEventNotificationSender($provider, $logger);
             $mailNotification->setType($notificationTypes);
             $mailNotification->setRecipients($recipients);
diff --git a/lang/ilias_de.lang b/lang/ilias_de.lang
index 3f34cb3c9192..a0ea1a9c1933 100644
--- a/lang/ilias_de.lang
+++ b/lang/ilias_de.lang
@@ -10111,6 +10111,7 @@ forum#:#forums_enable_notification#:#Benachrichtigung für dieses Thema starten
 forum#:#forums_forum_notification#:#Foren-Benachrichtigungen versenden
 forum#:#forums_forum_notification_desc#:#Wenn aktiviert, sendet ILIAS Mails an die Benutzer, die bei ausgewählten Foren-Themen über neue Beiträge benachrichtigt werden wollen.
 forum#:#forums_forum_notification_disabled#:#Sie werden nicht mehr über neue Beiträge in diesem Forum benachrichtigt.
+forum#:#forums_forum_push_notification_desc#:#Foren-Benachrichtigungen werden als Push-Benachrichtigungen statt per E-Mail versendet. Wenn die Push-Benachrichtigung nicht zugestellt werden kann, wird stattdessen eine E-Mail versendet.
 forum#:#forums_info_censor2_post#:#Sind Sie sicher, dass die Zensur für diesen Beitrag aufgehoben werden soll?
 forum#:#forums_info_censor_post#:#Geben Sie eine Begründung für die Zensur an.
 forum#:#forums_info_delete_draft#:#Sind Sie sicher, dass Sie diesen Entwurf löschen möchten?
diff --git a/lang/ilias_en.lang b/lang/ilias_en.lang
index 43e3390b4702..198bdf68fe5b 100644
--- a/lang/ilias_en.lang
+++ b/lang/ilias_en.lang
@@ -10085,6 +10085,7 @@ forum#:#forums_enable_notification#:#Enable Notification for this Thread
 forum#:#forums_forum_notification#:#Send Forum Notifications
 forum#:#forums_forum_notification_desc#:#If enabled, all users, who want to be informed about new posts in specified forum threads, will get notifications by mail.
 forum#:#forums_forum_notification_disabled#:#You will no longer be notified about new posts in this forum.
+forum#:#forums_forum_push_notification_desc#:#Forum notifications are sent as push notifications instead of e-mail. If the push notification cannot be delivered, an e-mail will be sent instead.
 forum#:#forums_info_censor2_post#:#Revoke Censorship?
 forum#:#forums_info_censor_post#:#Please provide a reason for hiding this post.
 forum#:#forums_info_delete_draft#:#Are you sure, you want to delete this draft?