From e092f91c44d075a7eb4bdda76b761cfb9c26b18a Mon Sep 17 00:00:00 2001
From: Robin Appelman <robin@icewind.nl>
Date: Tue, 17 May 2022 15:20:28 +0200
Subject: [PATCH] expose displayname cache trough a public interface

Signed-off-by: Robin Appelman <robin@icewind.nl>
---
 lib/private/Files/View.php    |  5 +----
 lib/private/Server.php        |  5 +++++
 lib/private/User/LazyUser.php |  6 ++----
 lib/private/User/Manager.php  | 11 +++++++++++
 lib/public/IUserManager.php   | 11 +++++++++++
 5 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/lib/private/Files/View.php b/lib/private/Files/View.php
index 2b6732e2ba057..abedb58d5877a 100644
--- a/lib/private/Files/View.php
+++ b/lib/private/Files/View.php
@@ -103,8 +103,6 @@ class View {
 
 	private LoggerInterface $logger;
 
-	private DisplayNameCache $displayNameCache;
-
 	/**
 	 * @param string $root
 	 * @throws \Exception If $root contains an invalid path
@@ -121,7 +119,6 @@ public function __construct($root = '') {
 		$this->lockingProvider = \OC::$server->getLockingProvider();
 		$this->lockingEnabled = !($this->lockingProvider instanceof \OC\Lock\NoopLockingProvider);
 		$this->userManager = \OC::$server->getUserManager();
-		$this->displayNameCache = \OC::$server->get(DisplayNameCache::class);
 		$this->logger = \OC::$server->get(LoggerInterface::class);
 	}
 
@@ -1319,7 +1316,7 @@ public function hasUpdated($path, $time) {
 	 * @return IUser
 	 */
 	private function getUserObjectForOwner(string $ownerId) {
-		return new LazyUser($ownerId, $this->displayNameCache, $this->userManager);
+		return new LazyUser($ownerId, $this->userManager);
 	}
 
 	/**
diff --git a/lib/private/Server.php b/lib/private/Server.php
index 6e6fa43048972..cc855eb030451 100644
--- a/lib/private/Server.php
+++ b/lib/private/Server.php
@@ -151,6 +151,7 @@
 use OC\Tagging\TagMapper;
 use OC\Talk\Broker;
 use OC\Template\JSCombiner;
+use OC\User\DisplayNameCache;
 use OCA\Theming\ImageManager;
 use OCA\Theming\ThemingDefaults;
 use OCA\Theming\Util;
@@ -472,6 +473,10 @@ public function __construct($webRoot, \OC\Config $config) {
 		$this->registerDeprecatedAlias('UserManager', \OC\User\Manager::class);
 		$this->registerAlias(\OCP\IUserManager::class, \OC\User\Manager::class);
 
+		$this->registerService(DisplayNameCache::class, function (ContainerInterface $c) {
+			return $c->get(\OC\User\Manager::class)->getDisplayNameCache();
+		});
+
 		$this->registerService(\OCP\IGroupManager::class, function (ContainerInterface $c) {
 			$groupManager = new \OC\Group\Manager(
 				$this->get(IUserManager::class),
diff --git a/lib/private/User/LazyUser.php b/lib/private/User/LazyUser.php
index 8b98b112731e4..30e44d570617c 100644
--- a/lib/private/User/LazyUser.php
+++ b/lib/private/User/LazyUser.php
@@ -28,12 +28,10 @@
 
 class LazyUser implements IUser {
 	private ?IUser $user = null;
-	private DisplayNameCache $displayNameCache;
 	private string $uid;
 	private IUserManager $userManager;
 
-	public function __construct(string $uid, DisplayNameCache $displayNameCache, IUserManager $userManager) {
-		$this->displayNameCache = $displayNameCache;
+	public function __construct(string $uid, IUserManager $userManager) {
 		$this->uid = $uid;
 		$this->userManager = $userManager;
 	}
@@ -52,7 +50,7 @@ public function getUID() {
 	}
 
 	public function getDisplayName() {
-		return $this->displayNameCache->getDisplayName($this->uid);
+		return $this->userManager->getDisplayName($this->uid);
 	}
 
 	public function setDisplayName($displayName) {
diff --git a/lib/private/User/Manager.php b/lib/private/User/Manager.php
index c59cbaa7b2055..5a5edbdbd2778 100644
--- a/lib/private/User/Manager.php
+++ b/lib/private/User/Manager.php
@@ -93,6 +93,8 @@ class Manager extends PublicEmitter implements IUserManager {
 	/** @var IEventDispatcher */
 	private $eventDispatcher;
 
+	private DisplayNameCache $displayNameCache;
+
 	public function __construct(IConfig $config,
 								EventDispatcherInterface $oldDispatcher,
 								ICacheFactory $cacheFactory,
@@ -106,6 +108,7 @@ public function __construct(IConfig $config,
 			unset($cachedUsers[$user->getUID()]);
 		});
 		$this->eventDispatcher = $eventDispatcher;
+		$this->displayNameCache = new DisplayNameCache($cacheFactory, $this);
 	}
 
 	/**
@@ -183,6 +186,10 @@ public function get($uid) {
 		return null;
 	}
 
+	public function getDisplayName(string $uid): string {
+		return $this->displayNameCache->getDisplayName($uid);
+	}
+
 	/**
 	 * get or construct the user object
 	 *
@@ -740,4 +747,8 @@ private function verifyUid(string $uid): bool {
 
 		return !file_exists(rtrim($dataDirectory, '/') . '/' . $uid);
 	}
+
+	public function getDisplayNameCache(): DisplayNameCache {
+		return $this->displayNameCache;
+	}
 }
diff --git a/lib/public/IUserManager.php b/lib/public/IUserManager.php
index e5c220af40c60..da7d477ad4317 100644
--- a/lib/public/IUserManager.php
+++ b/lib/public/IUserManager.php
@@ -84,6 +84,17 @@ public function clearBackends() ;
 	 */
 	public function get($uid);
 
+	/**
+	 * Get the display name of a user
+	 *
+	 * Note that this will return the uid if the user is not found instead of throwing an exception
+	 *
+	 * @param string $uid
+	 * @return string
+	 * @since 25.0.0
+	 */
+	public function getDisplayName(string $uid): string;
+
 	/**
 	 * check if a user exists
 	 *