1 files changed, 76 insertions, 0 deletions
diff --git a/lib/private/KnownUser/KnownUserService.php b/lib/private/KnownUser/KnownUserService.php
new file mode 100644
index 00000000000..cd257cf1b12
--- /dev/null
+++ b/lib/private/KnownUser/KnownUserService.php
@@ -0,0 +1,76 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2021 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OC\KnownUser;
+
+class KnownUserService {
+	/** @var KnownUserMapper */
+	protected $mapper;
+	/** @var array */
+	protected $knownUsers = [];
+
+	public function __construct(KnownUserMapper $mapper) {
+		$this->mapper = $mapper;
+	}
+
+	/**
+	 * Delete all matches where the given user is the owner of the phonebook
+	 *
+	 * @param string $knownTo
+	 * @return int Number of deleted matches
+	 */
+	public function deleteKnownTo(string $knownTo): int {
+		return $this->mapper->deleteKnownTo($knownTo);
+	}
+
+	/**
+	 * Delete all matches where the given user is the one in the phonebook
+	 *
+	 * @param string $contactUserId
+	 * @return int Number of deleted matches
+	 */
+	public function deleteByContactUserId(string $contactUserId): int {
+		return $this->mapper->deleteKnownUser($contactUserId);
+	}
+
+	/**
+	 * Store a match because $knownTo has $contactUserId in their phonebook
+	 *
+	 * @param string $knownTo User id of the owner of the phonebook
+	 * @param string $contactUserId User id of the contact in the phonebook
+	 */
+	public function storeIsKnownToUser(string $knownTo, string $contactUserId): void {
+		$entity = new KnownUser();
+		$entity->setKnownTo($knownTo);
+		$entity->setKnownUser($contactUserId);
+		$this->mapper->insert($entity);
+	}
+
+	/**
+	 * Check if $contactUserId is in the phonebook of $knownTo
+	 *
+	 * @param string $knownTo User id of the owner of the phonebook
+	 * @param string $contactUserId User id of the contact in the phonebook
+	 * @return bool
+	 */
+	public function isKnownToUser(string $knownTo, string $contactUserId): bool {
+		if ($knownTo === $contactUserId) {
+			return true;
+		}
+
+		if (!isset($this->knownUsers[$knownTo])) {
+			$entities = $this->mapper->getKnownUsers($knownTo);
+			$this->knownUsers[$knownTo] = [];
+			foreach ($entities as $entity) {
+				$this->knownUsers[$knownTo][$entity->getKnownUser()] = true;
+			}
+		}
+
+		return isset($this->knownUsers[$knownTo][$contactUserId]);
+	}
+}