Add a service to find out if a user knows another user

Signed-off-by: Joas Schilling <coding@schilljs.com>

2 files changed, 75 insertions, 0 deletions

diff --git a/lib/private/KnownUser/KnownUserMapper.php b/lib/private/KnownUser/KnownUserMapper.php
index 86e13a2e2f0..1144e2fd212 100644
--- a/lib/private/KnownUser/KnownUserMapper.php
+++ b/lib/private/KnownUser/KnownUserMapper.php
@@ -62,6 +62,19 @@ class KnownUserMapper extends QBMapper {
 		return (int) $query->execute();
 	}
 
+	/**
+	 * @param string $knownTo
+	 * @return KnownUser[]
+	 */
+	public function getKnownTo(string $knownTo): array {
+		$query = $this->db->getQueryBuilder();
+		$query->select('*')
+			->from($this->getTableName())
+			->where($query->expr()->eq('known_to', $query->createNamedParameter($knownTo)));
+
+		return $this->findEntities($query);
+	}
+
 	public function createKnownUserFromRow(array $row): KnownUser {
 		return $this->mapRowToEntity([
 			'id' => $row['s_id'],
diff --git a/lib/private/KnownUser/KnownUserService.php b/lib/private/KnownUser/KnownUserService.php
new file mode 100644
index 00000000000..3a97b967c3a
--- /dev/null
+++ b/lib/private/KnownUser/KnownUserService.php
@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2021 Joas Schilling <coding@schilljs.com>
+ *
+ * @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 OC\KnownUser;
+
+class KnownUserService {
+	/** @var KnownUserMapper */
+	protected $mapper;
+	/** @var array */
+	protected $knownUsers = [];
+
+	public function __construct(KnownUserMapper $mapper) {
+		$this->mapper = $mapper;
+	}
+
+	public function deleteKnownTo(string $knownTo): int {
+		return $this->mapper->deleteKnownTo($knownTo);
+	}
+
+	public function deleteKnownUser(string $knownUser): int {
+		return $this->mapper->deleteKnownUser($knownUser);
+	}
+
+	public function storeIsKnownToUser(string $knownTo, string $knownUser): void {
+		$entity = new KnownUser();
+		$entity->setKnownTo($knownTo);
+		$entity->setKnownUser($knownUser);
+		$this->mapper->insert($entity);
+	}
+
+	public function isKnownToUser(string $knownTo, string $user): bool {
+		if (!isset($this->knownUsers[$knownTo])) {
+			$entities = $this->mapper->getKnownTo($knownTo);
+			$this->knownUsers[$knownTo] = [];
+			foreach ($entities as $entity) {
+				$this->knownUsers[$knownTo][$entity->getKnownUser()] = true;
+			}
+		}
+
+		return isset($this->knownUsers[$knownTo][$user]);
+	}
+}