1 files changed, 132 insertions, 0 deletions
diff --git a/apps/settings/lib/Activity/GroupProvider.php b/apps/settings/lib/Activity/GroupProvider.php
new file mode 100644
index 00000000000..2d492265cf4
--- /dev/null
+++ b/apps/settings/lib/Activity/GroupProvider.php
@@ -0,0 +1,132 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCA\Settings\Activity;
+
+use OCP\Activity\Exceptions\UnknownActivityException;
+use OCP\Activity\IEvent;
+use OCP\Activity\IManager;
+use OCP\Activity\IProvider;
+use OCP\IGroup;
+use OCP\IGroupManager;
+use OCP\IURLGenerator;
+use OCP\IUserManager;
+use OCP\L10N\IFactory as L10nFactory;
+
+class GroupProvider implements IProvider {
+	public const ADDED_TO_GROUP = 'group_added';
+	public const REMOVED_FROM_GROUP = 'group_removed';
+
+	/** @var string[] */
+	protected $groupDisplayNames = [];
+
+
+	public function __construct(
+		private L10nFactory $l10n,
+		private IURLGenerator $urlGenerator,
+		private IManager $activityManager,
+		protected IUserManager $userManager,
+		protected IGroupManager $groupManager,
+	) {
+	}
+
+	public function parse($language, IEvent $event, ?IEvent $previousEvent = null) {
+		if ($event->getType() !== 'group_settings') {
+			throw new UnknownActivityException();
+		}
+
+		$l = $this->l10n->get('settings', $language);
+
+		$params = $event->getSubjectParameters();
+		$parsedParameters = [
+			'user' => $this->generateUserParameter($params['user']),
+			'group' => $this->generateGroupParameter($params['group']),
+		];
+
+		if (isset($params['actor'])) {
+			$parsedParameters['actor'] = $this->generateUserParameter($params['actor']);
+		}
+
+		switch ($event->getSubject()) {
+			case self::ADDED_TO_GROUP:
+				if (isset($parsedParameters['actor'])) {
+					if ($this->activityManager->getCurrentUserId() === $params['user']) {
+						$subject = $l->t('{actor} added you to group {group}');
+					} elseif (isset($params['actor']) && $this->activityManager->getCurrentUserId() === $params['actor']) {
+						$subject = $l->t('You added {user} to group {group}');
+					} else {
+						$subject = $l->t('{actor} added {user} to group {group}');
+					}
+				} elseif ($this->activityManager->getCurrentUserId() === $params['user']) {
+					$subject = $l->t('An administrator added you to group {group}');
+				} else {
+					$subject = $l->t('An administrator added {user} to group {group}');
+				}
+				break;
+			case self::REMOVED_FROM_GROUP:
+				if (isset($parsedParameters['actor'])) {
+					if ($this->activityManager->getCurrentUserId() === $params['user']) {
+						$subject = $l->t('{actor} removed you from group {group}');
+					} elseif (isset($params['actor']) && $this->activityManager->getCurrentUserId() === $params['actor']) {
+						$subject = $l->t('You removed {user} from group {group}');
+					} else {
+						$subject = $l->t('{actor} removed {user} from group {group}');
+					}
+				} elseif ($this->activityManager->getCurrentUserId() === $params['user']) {
+					$subject = $l->t('An administrator removed you from group {group}');
+				} else {
+					$subject = $l->t('An administrator removed {user} from group {group}');
+				}
+				break;
+			default:
+				throw new UnknownActivityException();
+		}
+
+		$this->setSubjects($event, $subject, $parsedParameters);
+
+		return $event;
+	}
+
+	protected function setSubjects(IEvent $event, string $subject, array $parameters): void {
+		$event->setRichSubject($subject, $parameters);
+	}
+
+	/**
+	 * @param string $gid
+	 * @return array
+	 */
+	protected function generateGroupParameter(string $gid): array {
+		if (!isset($this->groupDisplayNames[$gid])) {
+			$this->groupDisplayNames[$gid] = $this->getGroupDisplayName($gid);
+		}
+
+		return [
+			'type' => 'user-group',
+			'id' => $gid,
+			'name' => $this->groupDisplayNames[$gid],
+		];
+	}
+
+	/**
+	 * @param string $gid
+	 * @return string
+	 */
+	protected function getGroupDisplayName(string $gid): string {
+		$group = $this->groupManager->get($gid);
+		if ($group instanceof IGroup) {
+			return $group->getDisplayName();
+		}
+		return $gid;
+	}
+
+	protected function generateUserParameter(string $uid): array {
+		return [
+			'type' => 'user',
+			'id' => $uid,
+			'name' => $this->userManager->getDisplayName($uid) ?? $uid,
+		];
+	}
+}