From 73fdb8e016ee0166c67fc50feaae10c68759d7cb Mon Sep 17 00:00:00 2001
From: Christoph Wurst <christoph@winzerhof-wurst.at>
Date: Wed, 11 Dec 2019 10:20:36 +0100
Subject: [PATCH] Add typed events for all group hooks and legacy events

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>
---
 lib/composer/composer/autoload_classmap.php   |  8 +++
 lib/composer/composer/autoload_static.php     |  8 +++
 lib/private/Server.php                        | 46 ++++++++++++-
 .../Group/Events/BeforeGroupCreatedEvent.php  | 55 +++++++++++++++
 .../Group/Events/BeforeGroupDeletedEvent.php  | 55 +++++++++++++++
 .../Group/Events/BeforeUserAddedEvent.php     | 68 +++++++++++++++++++
 .../Group/Events/BeforeUserRemovedEvent.php   | 68 +++++++++++++++++++
 lib/public/Group/Events/GroupCreatedEvent.php | 55 +++++++++++++++
 lib/public/Group/Events/GroupDeletedEvent.php | 55 +++++++++++++++
 lib/public/Group/Events/UserAddedEvent.php    | 68 +++++++++++++++++++
 lib/public/Group/Events/UserRemovedEvent.php  | 68 +++++++++++++++++++
 11 files changed, 552 insertions(+), 2 deletions(-)
 create mode 100644 lib/public/Group/Events/BeforeGroupCreatedEvent.php
 create mode 100644 lib/public/Group/Events/BeforeGroupDeletedEvent.php
 create mode 100644 lib/public/Group/Events/BeforeUserAddedEvent.php
 create mode 100644 lib/public/Group/Events/BeforeUserRemovedEvent.php
 create mode 100644 lib/public/Group/Events/GroupCreatedEvent.php
 create mode 100644 lib/public/Group/Events/GroupDeletedEvent.php
 create mode 100644 lib/public/Group/Events/UserAddedEvent.php
 create mode 100644 lib/public/Group/Events/UserRemovedEvent.php

diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index 563d7cf7c72..d348b2f81ae 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -302,6 +302,14 @@ return array(
     'OCP\\Group\\Backend\\IIsAdminBackend' => $baseDir . '/lib/public/Group/Backend/IIsAdminBackend.php',
     'OCP\\Group\\Backend\\IRemoveFromGroupBackend' => $baseDir . '/lib/public/Group/Backend/IRemoveFromGroupBackend.php',
     'OCP\\Group\\Backend\\ISetDisplayNameBackend' => $baseDir . '/lib/public/Group/Backend/ISetDisplayNameBackend.php',
+    'OCP\\Group\\Events\\BeforeGroupCreatedEvent' => $baseDir . '/lib/public/Group/Events/BeforeGroupCreatedEvent.php',
+    'OCP\\Group\\Events\\BeforeGroupDeletedEvent' => $baseDir . '/lib/public/Group/Events/BeforeGroupDeletedEvent.php',
+    'OCP\\Group\\Events\\BeforeUserAddedEvent' => $baseDir . '/lib/public/Group/Events/BeforeUserAddedEvent.php',
+    'OCP\\Group\\Events\\BeforeUserRemovedEvent' => $baseDir . '/lib/public/Group/Events/BeforeUserRemovedEvent.php',
+    'OCP\\Group\\Events\\GroupCreatedEvent' => $baseDir . '/lib/public/Group/Events/GroupCreatedEvent.php',
+    'OCP\\Group\\Events\\GroupDeletedEvent' => $baseDir . '/lib/public/Group/Events/GroupDeletedEvent.php',
+    'OCP\\Group\\Events\\UserAddedEvent' => $baseDir . '/lib/public/Group/Events/UserAddedEvent.php',
+    'OCP\\Group\\Events\\UserRemovedEvent' => $baseDir . '/lib/public/Group/Events/UserRemovedEvent.php',
     'OCP\\Group\\ISubAdmin' => $baseDir . '/lib/public/Group/ISubAdmin.php',
     'OCP\\Http\\Client\\IClient' => $baseDir . '/lib/public/Http/Client/IClient.php',
     'OCP\\Http\\Client\\IClientService' => $baseDir . '/lib/public/Http/Client/IClientService.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index 140ec461857..172eff376ad 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -331,6 +331,14 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OCP\\Group\\Backend\\IIsAdminBackend' => __DIR__ . '/../../..' . '/lib/public/Group/Backend/IIsAdminBackend.php',
         'OCP\\Group\\Backend\\IRemoveFromGroupBackend' => __DIR__ . '/../../..' . '/lib/public/Group/Backend/IRemoveFromGroupBackend.php',
         'OCP\\Group\\Backend\\ISetDisplayNameBackend' => __DIR__ . '/../../..' . '/lib/public/Group/Backend/ISetDisplayNameBackend.php',
+        'OCP\\Group\\Events\\BeforeGroupCreatedEvent' => __DIR__ . '/../../..' . '/lib/public/Group/Events/BeforeGroupCreatedEvent.php',
+        'OCP\\Group\\Events\\BeforeGroupDeletedEvent' => __DIR__ . '/../../..' . '/lib/public/Group/Events/BeforeGroupDeletedEvent.php',
+        'OCP\\Group\\Events\\BeforeUserAddedEvent' => __DIR__ . '/../../..' . '/lib/public/Group/Events/BeforeUserAddedEvent.php',
+        'OCP\\Group\\Events\\BeforeUserRemovedEvent' => __DIR__ . '/../../..' . '/lib/public/Group/Events/BeforeUserRemovedEvent.php',
+        'OCP\\Group\\Events\\GroupCreatedEvent' => __DIR__ . '/../../..' . '/lib/public/Group/Events/GroupCreatedEvent.php',
+        'OCP\\Group\\Events\\GroupDeletedEvent' => __DIR__ . '/../../..' . '/lib/public/Group/Events/GroupDeletedEvent.php',
+        'OCP\\Group\\Events\\UserAddedEvent' => __DIR__ . '/../../..' . '/lib/public/Group/Events/UserAddedEvent.php',
+        'OCP\\Group\\Events\\UserRemovedEvent' => __DIR__ . '/../../..' . '/lib/public/Group/Events/UserRemovedEvent.php',
         'OCP\\Group\\ISubAdmin' => __DIR__ . '/../../..' . '/lib/public/Group/ISubAdmin.php',
         'OCP\\Http\\Client\\IClient' => __DIR__ . '/../../..' . '/lib/public/Http/Client/IClient.php',
         'OCP\\Http\\Client\\IClientService' => __DIR__ . '/../../..' . '/lib/public/Http/Client/IClientService.php',
diff --git a/lib/private/Server.php b/lib/private/Server.php
index dcac72369e4..8aa508bb7c5 100644
--- a/lib/private/Server.php
+++ b/lib/private/Server.php
@@ -148,6 +148,14 @@ use OCP\Files\NotFoundException;
 use OCP\Files\Storage\IStorageFactory;
 use OCP\FullTextSearch\IFullTextSearchManager;
 use OCP\GlobalScale\IConfig;
+use OCP\Group\Events\BeforeGroupCreatedEvent;
+use OCP\Group\Events\BeforeGroupDeletedEvent;
+use OCP\Group\Events\BeforeUserAddedEvent;
+use OCP\Group\Events\BeforeUserRemovedEvent;
+use OCP\Group\Events\GroupCreatedEvent;
+use OCP\Group\Events\GroupDeletedEvent;
+use OCP\Group\Events\UserAddedEvent;
+use OCP\Group\Events\UserRemovedEvent;
 use OCP\Group\ISubAdmin;
 use OCP\ICacheFactory;
 use OCP\IDBConnection;
@@ -329,23 +337,57 @@ class Server extends ServerContainer implements IServerContainer {
 			$groupManager = new \OC\Group\Manager($this->getUserManager(), $c->getEventDispatcher(), $this->getLogger());
 			$groupManager->listen('\OC\Group', 'preCreate', function ($gid) {
 				\OC_Hook::emit('OC_Group', 'pre_createGroup', array('run' => true, 'gid' => $gid));
+
+				/** @var IEventDispatcher $dispatcher */
+				$dispatcher = $this->query(IEventDispatcher::class);
+				$dispatcher->dispatchTyped(new BeforeGroupCreatedEvent($gid));
 			});
-			$groupManager->listen('\OC\Group', 'postCreate', function (\OC\Group\Group $gid) {
-				\OC_Hook::emit('OC_User', 'post_createGroup', array('gid' => $gid->getGID()));
+			$groupManager->listen('\OC\Group', 'postCreate', function (\OC\Group\Group $group) {
+				\OC_Hook::emit('OC_User', 'post_createGroup', array('gid' => $group->getGID()));
+
+				/** @var IEventDispatcher $dispatcher */
+				$dispatcher = $this->query(IEventDispatcher::class);
+				$dispatcher->dispatchTyped(new GroupCreatedEvent($group));
 			});
 			$groupManager->listen('\OC\Group', 'preDelete', function (\OC\Group\Group $group) {
 				\OC_Hook::emit('OC_Group', 'pre_deleteGroup', array('run' => true, 'gid' => $group->getGID()));
+
+				/** @var IEventDispatcher $dispatcher */
+				$dispatcher = $this->query(IEventDispatcher::class);
+				$dispatcher->dispatchTyped(new BeforeGroupDeletedEvent($group));
 			});
 			$groupManager->listen('\OC\Group', 'postDelete', function (\OC\Group\Group $group) {
 				\OC_Hook::emit('OC_User', 'post_deleteGroup', array('gid' => $group->getGID()));
+
+				/** @var IEventDispatcher $dispatcher */
+				$dispatcher = $this->query(IEventDispatcher::class);
+				$dispatcher->dispatchTyped(new GroupDeletedEvent($group));
 			});
 			$groupManager->listen('\OC\Group', 'preAddUser', function (\OC\Group\Group $group, \OC\User\User $user) {
 				\OC_Hook::emit('OC_Group', 'pre_addToGroup', array('run' => true, 'uid' => $user->getUID(), 'gid' => $group->getGID()));
+
+				/** @var IEventDispatcher $dispatcher */
+				$dispatcher = $this->query(IEventDispatcher::class);
+				$dispatcher->dispatchTyped(new BeforeUserAddedEvent($group, $user));
 			});
 			$groupManager->listen('\OC\Group', 'postAddUser', function (\OC\Group\Group $group, \OC\User\User $user) {
 				\OC_Hook::emit('OC_Group', 'post_addToGroup', array('uid' => $user->getUID(), 'gid' => $group->getGID()));
 				//Minimal fix to keep it backward compatible TODO: clean up all the GroupManager hooks
 				\OC_Hook::emit('OC_User', 'post_addToGroup', array('uid' => $user->getUID(), 'gid' => $group->getGID()));
+
+				/** @var IEventDispatcher $dispatcher */
+				$dispatcher = $this->query(IEventDispatcher::class);
+				$dispatcher->dispatchTyped(new UserAddedEvent($group, $user));
+			});
+			$groupManager->listen('\OC\Group', 'preRemoveUser', function (\OC\Group\Group $group, \OC\User\User $user) {
+				/** @var IEventDispatcher $dispatcher */
+				$dispatcher = $this->query(IEventDispatcher::class);
+				$dispatcher->dispatchTyped(new BeforeUserRemovedEvent($group, $user));
+			});
+			$groupManager->listen('\OC\Group', 'postRemoveUser', function (\OC\Group\Group $group, \OC\User\User $user) {
+				/** @var IEventDispatcher $dispatcher */
+				$dispatcher = $this->query(IEventDispatcher::class);
+				$dispatcher->dispatchTyped(new UserRemovedEvent($group, $user));
 			});
 			return $groupManager;
 		});
diff --git a/lib/public/Group/Events/BeforeGroupCreatedEvent.php b/lib/public/Group/Events/BeforeGroupCreatedEvent.php
new file mode 100644
index 00000000000..b2445eb8bb0
--- /dev/null
+++ b/lib/public/Group/Events/BeforeGroupCreatedEvent.php
@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCP\Group\Events;
+
+use OCP\EventDispatcher\Event;
+use OCP\IGroup;
+
+/**
+ * @since 18.0.0
+ */
+class BeforeGroupCreatedEvent extends Event {
+
+	/** @var string */
+	private $name;
+
+	/**
+	 * @since 18.0.0
+	 */
+	public function __construct(string $name) {
+		parent::__construct();
+		$this->name = $name;
+	}
+
+	/**
+	 * @return string
+	 * @since 18.0.0
+	 */
+	public function getName(): string {
+		return $this->name;
+	}
+
+}
diff --git a/lib/public/Group/Events/BeforeGroupDeletedEvent.php b/lib/public/Group/Events/BeforeGroupDeletedEvent.php
new file mode 100644
index 00000000000..39c01095d9b
--- /dev/null
+++ b/lib/public/Group/Events/BeforeGroupDeletedEvent.php
@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCP\Group\Events;
+
+use OCP\EventDispatcher\Event;
+use OCP\IGroup;
+
+/**
+ * @since 18.0.0
+ */
+class BeforeGroupDeletedEvent extends Event {
+
+	/** @var IGroup */
+	private $group;
+
+	/**
+	 * @since 18.0.0
+	 */
+	public function __construct(IGroup $group) {
+		parent::__construct();
+		$this->group = $group;
+	}
+
+	/**
+	 * @return IGroup
+	 * @since 18.0.0
+	 */
+	public function getGroup(): IGroup {
+		return $this->group;
+	}
+
+}
diff --git a/lib/public/Group/Events/BeforeUserAddedEvent.php b/lib/public/Group/Events/BeforeUserAddedEvent.php
new file mode 100644
index 00000000000..722e8ea5079
--- /dev/null
+++ b/lib/public/Group/Events/BeforeUserAddedEvent.php
@@ -0,0 +1,68 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCP\Group\Events;
+
+use OCP\EventDispatcher\Event;
+use OCP\IGroup;
+use OCP\IUser;
+
+/**
+ * @since 18.0.0
+ */
+class BeforeUserAddedEvent extends Event {
+
+	/** @var IGroup */
+	private $group;
+
+	/*** @var IUser */
+	private $user;
+
+	/**
+	 * @since 18.0.0
+	 */
+	public function __construct(IGroup $group, IUser $user) {
+		parent::__construct();
+		$this->group = $group;
+		$this->user = $user;
+	}
+
+	/**
+	 * @return IGroup
+	 * @since 18.0.0
+	 */
+	public function getGroup(): IGroup {
+		return $this->group;
+	}
+
+	/**
+	 * @return IUser
+	 * @since 18.0.0
+	 */
+	public function getUser(): IUser {
+		return $this->user;
+	}
+
+}
diff --git a/lib/public/Group/Events/BeforeUserRemovedEvent.php b/lib/public/Group/Events/BeforeUserRemovedEvent.php
new file mode 100644
index 00000000000..a64fcc13305
--- /dev/null
+++ b/lib/public/Group/Events/BeforeUserRemovedEvent.php
@@ -0,0 +1,68 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCP\Group\Events;
+
+use OCP\EventDispatcher\Event;
+use OCP\IGroup;
+use OCP\IUser;
+
+/**
+ * @since 18.0.0
+ */
+class BeforeUserRemovedEvent extends Event {
+
+	/** @var IGroup */
+	private $group;
+
+	/*** @var IUser */
+	private $user;
+
+	/**
+	 * @since 18.0.0
+	 */
+	public function __construct(IGroup $group, IUser $user) {
+		parent::__construct();
+		$this->group = $group;
+		$this->user = $user;
+	}
+
+	/**
+	 * @return IGroup
+	 * @since 18.0.0
+	 */
+	public function getGroup(): IGroup {
+		return $this->group;
+	}
+
+	/**
+	 * @return IUser
+	 * @since 18.0.0
+	 */
+	public function getUser(): IUser {
+		return $this->user;
+	}
+
+}
diff --git a/lib/public/Group/Events/GroupCreatedEvent.php b/lib/public/Group/Events/GroupCreatedEvent.php
new file mode 100644
index 00000000000..75c501d6fb7
--- /dev/null
+++ b/lib/public/Group/Events/GroupCreatedEvent.php
@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCP\Group\Events;
+
+use OCP\EventDispatcher\Event;
+use OCP\IGroup;
+
+/**
+ * @since 18.0.0
+ */
+class GroupCreatedEvent extends Event {
+
+	/** @var IGroup */
+	private $group;
+
+	/**
+	 * @since 18.0.0
+	 */
+	public function __construct(IGroup $group) {
+		parent::__construct();
+		$this->group = $group;
+	}
+
+	/**
+	 * @return IGroup
+	 * @since 18.0.0
+	 */
+	public function getGroup(): IGroup {
+		return $this->group;
+	}
+
+}
diff --git a/lib/public/Group/Events/GroupDeletedEvent.php b/lib/public/Group/Events/GroupDeletedEvent.php
new file mode 100644
index 00000000000..4d1dad1dd29
--- /dev/null
+++ b/lib/public/Group/Events/GroupDeletedEvent.php
@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCP\Group\Events;
+
+use OCP\EventDispatcher\Event;
+use OCP\IGroup;
+
+/**
+ * @since 18.0.0
+ */
+class GroupDeletedEvent extends Event {
+
+	/** @var IGroup */
+	private $group;
+
+	/**
+	 * @since 18.0.0
+	 */
+	public function __construct(IGroup $group) {
+		parent::__construct();
+		$this->group = $group;
+	}
+
+	/**
+	 * @return IGroup
+	 * @since 18.0.0
+	 */
+	public function getGroup(): IGroup {
+		return $this->group;
+	}
+
+}
diff --git a/lib/public/Group/Events/UserAddedEvent.php b/lib/public/Group/Events/UserAddedEvent.php
new file mode 100644
index 00000000000..f608b0cfc20
--- /dev/null
+++ b/lib/public/Group/Events/UserAddedEvent.php
@@ -0,0 +1,68 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCP\Group\Events;
+
+use OCP\EventDispatcher\Event;
+use OCP\IGroup;
+use OCP\IUser;
+
+/**
+ * @since 18.0.0
+ */
+class UserAddedEvent extends Event {
+
+	/** @var IGroup */
+	private $group;
+
+	/*** @var IUser */
+	private $user;
+
+	/**
+	 * @since 18.0.0
+	 */
+	public function __construct(IGroup $group, IUser $user) {
+		parent::__construct();
+		$this->group = $group;
+		$this->user = $user;
+	}
+
+	/**
+	 * @return IGroup
+	 * @since 18.0.0
+	 */
+	public function getGroup(): IGroup {
+		return $this->group;
+	}
+
+	/**
+	 * @return IUser
+	 * @since 18.0.0
+	 */
+	public function getUser(): IUser {
+		return $this->user;
+	}
+
+}
diff --git a/lib/public/Group/Events/UserRemovedEvent.php b/lib/public/Group/Events/UserRemovedEvent.php
new file mode 100644
index 00000000000..a3bd01d9eca
--- /dev/null
+++ b/lib/public/Group/Events/UserRemovedEvent.php
@@ -0,0 +1,68 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCP\Group\Events;
+
+use OCP\EventDispatcher\Event;
+use OCP\IGroup;
+use OCP\IUser;
+
+/**
+ * @since 18.0.0
+ */
+class UserRemovedEvent extends Event {
+
+	/** @var IGroup */
+	private $group;
+
+	/*** @var IUser */
+	private $user;
+
+	/**
+	 * @since 18.0.0
+	 */
+	public function __construct(IGroup $group, IUser $user) {
+		parent::__construct();
+		$this->group = $group;
+		$this->user = $user;
+	}
+
+	/**
+	 * @return IGroup
+	 * @since 18.0.0
+	 */
+	public function getGroup(): IGroup {
+		return $this->group;
+	}
+
+	/**
+	 * @return IUser
+	 * @since 18.0.0
+	 */
+	public function getUser(): IUser {
+		return $this->user;
+	}
+
+}
-- 
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