fix(users): improve recently active search

- Remove DISTINCT clause to fix PgSQL
- Join user table only if necessary
- Don't show people who never connected in active list
- Add test

Signed-off-by: Benjamin Gaussorgues <benjamin.gaussorgues@nextcloud.com>

lib/private/User/Manager.php

@@ -7,6 +7,7 @@
  */
 namespace OC\User;
 
+use Doctrine\DBAL\Platforms\OraclePlatform;
 use OC\Hooks\PublicEmitter;
 use OC\Memcache\WithLocalCache;
 use OCP\DB\QueryBuilder\IQueryBuilder;
@@ -742,12 +743,15 @@ class Manager extends PublicEmitter implements IUserManager {
 	/**
 	 * Gets the list of user ids sorted by lastLogin, from most recent to least recent
 	 *
-	 * @param int|null $limit how many users to fetch
+	 * @param int|null $limit how many users to fetch (default: 25, max: 100)
 	 * @param int $offset from which offset to fetch
 	 * @param string $search search users based on search params
 	 * @return list<string> list of user IDs
 	 */
 	public function getLastLoggedInUsers(?int $limit = null, int $offset = 0, string $search = ''): array {
+		// We can't load all users who already logged in
+		$limit = min(100, $limit ?: 25);
+
 		$connection = \OC::$server->getDatabaseConnection();
 		$queryBuilder = $connection->getQueryBuilder();
 		$queryBuilder->selectDistinct('uid')
@@ -772,14 +776,36 @@ class Manager extends PublicEmitter implements IUserManager {
 		$queryBuilder->orderBy($queryBuilder->func()->lower('p.configvalue'), 'DESC')
 			->addOrderBy('uid_lower', 'ASC')
 			->setFirstResult($offset)
-			->setMaxResults($limit);
+			->setMaxResults($limit)
+		;
 
-		$result = $queryBuilder->executeQuery();
-		/** @var list<string> $uids */
-		$uids = $result->fetchAll(\PDO::FETCH_COLUMN);
-		$result->closeCursor();
+		// Oracle don't want to run ORDER BY on CLOB column
+		$loginOrder = $connection->getDatabasePlatform() instanceof OraclePlatform
+			? $queryBuilder->expr()->castColumn('pref_login.configvalue', IQueryBuilder::PARAM_INT)
+			: 'pref_login.configvalue';
+		$queryBuilder
+			->orderBy($loginOrder, 'DESC')
+			->addOrderBy($queryBuilder->func()->lower('pref_login.userid'), 'ASC');
+
+		if ($search !== '') {
+			$displayNameMatches = $this->searchDisplayName($search);
+			$matchedUids = array_map(static fn (IUser $u): string => $u->getUID(), $displayNameMatches);
+
+			$queryBuilder
+				->leftJoin('pref_login', 'preferences', 'pref_email', $queryBuilder->expr()->andX(
+					$queryBuilder->expr()->eq('pref_login.userid', 'pref_email.userid'),
+					$queryBuilder->expr()->eq('pref_email.appid', $queryBuilder->expr()->literal('settings')),
+					$queryBuilder->expr()->eq('pref_email.configkey', $queryBuilder->expr()->literal('email')),
+				))
+				->andWhere($queryBuilder->expr()->orX(
+					$queryBuilder->expr()->in('pref_login.userid', $queryBuilder->createNamedParameter($matchedUids, IQueryBuilder::PARAM_STR_ARRAY)),
+				));
+		}
+
+		/** @var list<string> */
+		$list = $queryBuilder->executeQuery()->fetchAll(\PDO::FETCH_COLUMN);
 
-		return $uids;
+		return $list;
 	}
 
 	private function verifyUid(string $uid, bool $checkDataDirectory = false): bool {

tests/lib/User/ManagerTest.php

@@ -16,6 +16,7 @@ use OCP\ICache;
 use OCP\ICacheFactory;
 use OCP\IConfig;
 use OCP\IUser;
+use OCP\IUserManager;
 use Psr\Log\LoggerInterface;
 use Test\TestCase;
 
@@ -579,7 +580,7 @@ class ManagerTest extends TestCase {
 	}
 
 	public function testCountUsersOnlyDisabled() {
-		$manager = \OC::$server->getUserManager();
+		$manager = \OCP\Server::get(IUserManager::class);
 		// count other users in the db before adding our own
 		$countBefore = $manager->countDisabledUsers();
 
@@ -604,7 +605,7 @@ class ManagerTest extends TestCase {
 	}
 
 	public function testCountUsersOnlySeen() {
-		$manager = \OC::$server->getUserManager();
+		$manager = \OCP\Server::get(IUserManager::class);
 		// count other users in the db before adding our own
 		$countBefore = $manager->countSeenUsers();
 
@@ -630,7 +631,7 @@ class ManagerTest extends TestCase {
 	}
 
 	public function testCallForSeenUsers() {
-		$manager = \OC::$server->getUserManager();
+		$manager = \OCP\Server::get(IUserManager::class);
 		// count other users in the db before adding our own
 		$count = 0;
 		$function = function (IUser $user) use (&$count) {
@@ -663,6 +664,66 @@ class ManagerTest extends TestCase {
 		$user4->delete();
 	}
 
+	/**
+	 * @runInSeparateProcess
+	 * @preserveGlobalState disabled
+	 */
+	public function testRecentlyActive(): void {
+		$config = \OCP\Server::get(IConfig::class);
+		$manager = \OCP\Server::get(IUserManager::class);
+
+		// Create some users
+		$now = (string)time();
+		$user1 = $manager->createUser('test_active_1', 'test_active_1');
+		$config->setUserValue('test_active_1', 'login', 'lastLogin', $now);
+		$user1->setDisplayName('test active 1');
+		$user1->setSystemEMailAddress('roger@active.com');
+
+		$user2 = $manager->createUser('TEST_ACTIVE_2_FRED', 'TEST_ACTIVE_2');
+		$config->setUserValue('TEST_ACTIVE_2_FRED', 'login', 'lastLogin', $now);
+		$user2->setDisplayName('TEST ACTIVE 2 UPPER');
+		$user2->setSystemEMailAddress('Fred@Active.Com');
+
+		$user3 = $manager->createUser('test_active_3', 'test_active_3');
+		$config->setUserValue('test_active_3', 'login', 'lastLogin', $now + 1);
+		$user3->setDisplayName('test active 3');
+
+		$user4 = $manager->createUser('test_active_4', 'test_active_4');
+		$config->setUserValue('test_active_4', 'login', 'lastLogin', $now);
+		$user4->setDisplayName('Test Active 4');
+
+		$user5 = $manager->createUser('test_inactive_1', 'test_inactive_1');
+		$user5->setDisplayName('Test Inactive 1');
+		$user2->setSystemEMailAddress('jeanne@Active.Com');
+
+		// Search recently active
+		//  - No search, case-insensitive order
+		$users = $manager->getLastLoggedInUsers(4);
+		$this->assertEquals(['test_active_3', 'test_active_1', 'TEST_ACTIVE_2_FRED', 'test_active_4'], $users);
+		//  - Search, case-insensitive order
+		$users = $manager->getLastLoggedInUsers(search: 'act');
+		$this->assertEquals(['test_active_3', 'test_active_1', 'TEST_ACTIVE_2_FRED', 'test_active_4'], $users);
+		//  - No search with offset
+		$users = $manager->getLastLoggedInUsers(2, 2);
+		$this->assertEquals(['TEST_ACTIVE_2_FRED', 'test_active_4'], $users);
+		//  - Case insensitive search (email)
+		$users = $manager->getLastLoggedInUsers(search: 'active.com');
+		$this->assertEquals(['test_active_1', 'TEST_ACTIVE_2_FRED'], $users);
+		//  - Case insensitive search (display name)
+		$users = $manager->getLastLoggedInUsers(search: 'upper');
+		$this->assertEquals(['TEST_ACTIVE_2_FRED'], $users);
+		//  - Case insensitive search (uid)
+		$users = $manager->getLastLoggedInUsers(search: 'fred');
+		$this->assertEquals(['TEST_ACTIVE_2_FRED'], $users);
+
+		// Delete users and config keys
+		$user1->delete();
+		$user2->delete();
+		$user3->delete();
+		$user4->delete();
+		$user5->delete();
+	}
+
 	public function testDeleteUser() {
 		$config = $this->getMockBuilder(AllConfig::class)
 			->disableOriginalConstructor()