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

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

1 files changed, 62 insertions, 0 deletions

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]);
+	}
+}