feat(filters): Add a focused filter

This filter shows all activity related to files from your home. More
 should be added later.

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

Author: come-nc

appinfo/info.xml

@@ -61,6 +61,7 @@
 	<activity>
 		<filters>
 			<filter>OCA\Activity\Filter\AllFilter</filter>
+			<filter>OCA\Activity\Filter\FocusedFilter</filter>
 			<filter>OCA\Activity\Filter\SelfFilter</filter>
 			<filter>OCA\Activity\Filter\ByFilter</filter>
 		</filters>

lib/Data.php

@@ -292,7 +292,7 @@ public function get(GroupHelper $groupHelper, UserSettings $userSettings, string
 
 		$query = $this->connection->getQueryBuilder();
 		$query->select('*')
-			->from('activity');
+			->from('activity', 'a');
 
 		$this->applyStreamConditions($query, $userSettings, $user, $filter, $activeFilter, $objectType, $objectId, $search);
 
@@ -362,6 +362,30 @@ private function applyStreamConditions(
 		} elseif ($filter === 'filter') {
 			$query->andWhere($query->expr()->eq('object_type', $query->createNamedParameter($objectType)));
 			$query->andWhere($query->expr()->eq('object_id', $query->createNamedParameter($objectId)));
+		} elseif ($filter === 'focused') {
+			// Only activity related to files owned by the user
+			$query->leftJoin('a', 'filecache', 'f',
+				$query->expr()->andX(
+					$query->expr()->eq('a.object_type', $query->createNamedParameter('files')),
+					$query->expr()->eq('a.object_id', 'f.fileid'),
+				));
+			$query->leftJoin('f', 'mounts', 'm',
+				$query->expr()->andX(
+					$query->expr()->eq('a.object_type', $query->createNamedParameter('files')),
+					$query->expr()->eq('f.storage', 'm.storage_id'),
+				));
+			// Filter out our own activity
+			$query->andWhere($query->expr()->neq('user', $query->createNamedParameter($user)));
+			$query->andWhere(
+				$query->expr()->orX(
+					// Affected object is one of our files
+					$query->expr()->eq('m.mount_point', $query->createNamedParameter('/' . $user . '/')),
+					// There is no affected object, so the activity affects our user directly
+					$query->expr()->eq('object_type', $query->createNamedParameter('')),
+					// Show all sharing related events
+					$query->expr()->eq('app', $query->createNamedParameter('files_sharing')),
+				)
+			);
 		}
 
 		if ($activeFilter instanceof IFilter) {

lib/Filter/FocusedFilter.php

@@ -0,0 +1,59 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Activity\Filter;
+
+use OCP\Activity\IFilter;
+use OCP\IL10N;
+use OCP\IURLGenerator;
+
+class FocusedFilter implements IFilter {
+	public function __construct(
+		protected IL10N $l,
+		protected IURLGenerator $url,
+	) {
+	}
+
+	#[\Override]
+	public function getIdentifier(): string {
+		return 'focused';
+	}
+
+	#[\Override]
+	public function getName(): string {
+		return $this->l->t('Focused');
+	}
+
+	#[\Override]
+	public function getPriority(): int {
+		return 1;
+	}
+
+	#[\Override]
+	public function getIcon(): string {
+		return $this->url->getAbsoluteURL($this->url->imagePath('activity', 'activity-dark.svg'));
+	}
+
+	/**
+	 * @param string[] $types
+	 * @return string[] An array of allowed apps from which activities should be displayed
+	 */
+	#[\Override]
+	public function filterTypes(array $types): array {
+		return $types;
+	}
+
+	/**
+	 * @return string[] An array of allowed apps from which activities should be displayed
+	 */
+	#[\Override]
+	public function allowedApps(): array {
+		return [];
+	}
+}