nextcloud / server

apps/provisioning_api/lib/Controller/UsersController.php

Indentation +835 added lines, -835 removed lines

@@ -52,839 +52,839 @@
 
 class UsersController extends AUserData {
 
-	/** @var IAppManager */
-	private $appManager;
-	/** @var ILogger */
-	private $logger;
-	/** @var IFactory */
-	private $l10nFactory;
-	/** @var NewUserMailHelper */
-	private $newUserMailHelper;
-	/** @var FederatedFileSharingFactory */
-	private $federatedFileSharingFactory;
-	/** @var ISecureRandom */
-	private $secureRandom;
-
-	/**
-	 * @param string $appName
-	 * @param IRequest $request
-	 * @param IUserManager $userManager
-	 * @param IConfig $config
-	 * @param IAppManager $appManager
-	 * @param IGroupManager $groupManager
-	 * @param IUserSession $userSession
-	 * @param AccountManager $accountManager
-	 * @param ILogger $logger
-	 * @param IFactory $l10nFactory
-	 * @param NewUserMailHelper $newUserMailHelper
-	 * @param FederatedFileSharingFactory $federatedFileSharingFactory
-	 * @param ISecureRandom $secureRandom
-	 */
-	public function __construct(string $appName,
-								IRequest $request,
-								IUserManager $userManager,
-								IConfig $config,
-								IAppManager $appManager,
-								IGroupManager $groupManager,
-								IUserSession $userSession,
-								AccountManager $accountManager,
-								ILogger $logger,
-								IFactory $l10nFactory,
-								NewUserMailHelper $newUserMailHelper,
-								FederatedFileSharingFactory $federatedFileSharingFactory,
-								ISecureRandom $secureRandom) {
-		parent::__construct($appName,
-							$request,
-							$userManager,
-							$config,
-							$groupManager,
-							$userSession,
-							$accountManager);
-
-		$this->appManager = $appManager;
-		$this->logger = $logger;
-		$this->l10nFactory = $l10nFactory;
-		$this->newUserMailHelper = $newUserMailHelper;
-		$this->federatedFileSharingFactory = $federatedFileSharingFactory;
-		$this->secureRandom = $secureRandom;
-	}
-
-	/**
-	 * @NoAdminRequired
-	 *
-	 * returns a list of users
-	 *
-	 * @param string $search
-	 * @param int $limit
-	 * @param int $offset
-	 * @return DataResponse
-	 */
-	public function getUsers(string $search = '', $limit = null, $offset = 0): DataResponse {
-		$user = $this->userSession->getUser();
-		$users = [];
-
-		// Admin? Or SubAdmin?
-		$uid = $user->getUID();
-		$subAdminManager = $this->groupManager->getSubAdmin();
-		if ($this->groupManager->isAdmin($uid)){
-			$users = $this->userManager->search($search, $limit, $offset);
-		} else if ($subAdminManager->isSubAdmin($user)) {
-			$subAdminOfGroups = $subAdminManager->getSubAdminsGroups($user);
-			foreach ($subAdminOfGroups as $key => $group) {
-				$subAdminOfGroups[$key] = $group->getGID();
-			}
-
-			$users = [];
-			foreach ($subAdminOfGroups as $group) {
-				$users = array_merge($users, $this->groupManager->displayNamesInGroup($group, $search, $limit, $offset));
-			}
-		}
-
-		$users = array_keys($users);
-
-		return new DataResponse([
-			'users' => $users
-		]);
-	}
-
-	/**
-	 * @NoAdminRequired
-	 *
-	 * returns a list of users and their data
-	 */
-	public function getUsersDetails(string $search = '', $limit = null, $offset = 0): DataResponse {
-		$user = $this->userSession->getUser();
-		$users = [];
-
-		// Admin? Or SubAdmin?
-		$uid = $user->getUID();
-		$subAdminManager = $this->groupManager->getSubAdmin();
-		if ($this->groupManager->isAdmin($uid)){
-			$users = $this->userManager->search($search, $limit, $offset);
-		} else if ($subAdminManager->isSubAdmin($user)) {
-			$subAdminOfGroups = $subAdminManager->getSubAdminsGroups($user);
-			foreach ($subAdminOfGroups as $key => $group) {
-				$subAdminOfGroups[$key] = $group->getGID();
-			}
-
-			$users = [];
-			foreach ($subAdminOfGroups as $group) {
-				$users = array_merge($users, $this->groupManager->displayNamesInGroup($group, $search, $limit, $offset));
-			}
-		}
-
-		$users = array_keys($users);
-		$usersDetails = [];
-		foreach ($users as $key => $userId) {
-			$userData = $this->getUserData($userId);
-			// Do not insert empty entry
-			if (!empty($userData)) {
-				$usersDetails[$userId] = $userData;
-			}
-		}
-
-		return new DataResponse([
-			'users' => $usersDetails
-		]);
-	}
-
-	/**
-	 * @PasswordConfirmationRequired
-	 * @NoAdminRequired
-	 *
-	 * @param string $userid
-	 * @param string $password
-	 * @param string $email
-	 * @param array $groups
-	 * @param array $subadmins
-	 * @param string $quota
-	 * @return DataResponse
-	 * @throws OCSException
-	 */
-	public function addUser(string $userid,
-							string $password = '',
-							string $email = '',
-							array $groups = [],
-							array $subadmin = [],
-							string $quota = ''): DataResponse {
-		$user = $this->userSession->getUser();
-		$isAdmin = $this->groupManager->isAdmin($user->getUID());
-		$subAdminManager = $this->groupManager->getSubAdmin();
-
-		if ($this->userManager->userExists($userid)) {
-			$this->logger->error('Failed addUser attempt: User already exists.', ['app' => 'ocs_api']);
-			throw new OCSException('User already exists', 102);
-		}
-
-		if ($groups !== []) {
-			foreach ($groups as $group) {
-				if (!$this->groupManager->groupExists($group)) {
-					throw new OCSException('group '.$group.' does not exist', 104);
-				}
-				if (!$isAdmin && !$subAdminManager->isSubAdminOfGroup($user, $this->groupManager->get($group))) {
-					throw new OCSException('insufficient privileges for group '. $group, 105);
-				}
-			}
-		} else {
-			if (!$isAdmin) {
-				throw new OCSException('no group specified (required for subadmins)', 106);
-			}
-		}
-
-		$subadminGroups = [];
-		if ($subadmin !== []) {
-			foreach ($subadmin as $groupid) {
-				$group = $this->groupManager->get($groupid);
-				// Check if group exists
-				if ($group === null) {
-					throw new OCSException('Subadmin group does not exist',  102);
-				}
-				// Check if trying to make subadmin of admin group
-				if ($group->getGID() === 'admin') {
-					throw new OCSException('Cannot create subadmins for admin group', 103);
-				}
-				// Check if has permission to promote subadmins
-				if (!$subAdminManager->isSubAdminOfGroup($user, $group) && !$isAdmin) {
-					throw new OCSForbiddenException('No permissions to promote subadmins');
-				}
-				$subadminGroups[] = $group;
-			}
-		}
-
-		$generatePasswordResetToken = false;
-		if ($password === '') {
-			if ($email === '') {
-				throw new OCSException('To send a password link to the user an email address is required.', 108);
-			}
-
-			$password = $this->secureRandom->generate(10);
-			// Make sure we pass the password_policy
-			$password .= $this->secureRandom->generate(2, '$!.,;:-~+*[]{}()');
-			$generatePasswordResetToken = true;
-		}
-
-		try {
-			$newUser = $this->userManager->createUser($userid, $password);
-			$this->logger->info('Successful addUser call with userid: ' . $userid, ['app' => 'ocs_api']);
-
-			foreach ($groups as $group) {
-				$this->groupManager->get($group)->addUser($newUser);
-				$this->logger->info('Added userid ' . $userid . ' to group ' . $group, ['app' => 'ocs_api']);
-			}
-			foreach ($subadminGroups as $group) {
-				$subAdminManager->createSubAdmin($newUser, $group);
-			}
-
-			if ($quota !== '') {
-				$this->editUser($userid, 'quota', $quota);
-			}
-
-			// Send new user mail only if a mail is set
-			if ($email !== '') {
-				$newUser->setEMailAddress($email);
-				try {
-					$emailTemplate = $this->newUserMailHelper->generateTemplate($newUser, $generatePasswordResetToken);
-					$this->newUserMailHelper->sendMail($newUser, $emailTemplate);
-				} catch (\Exception $e) {
-					$this->logger->logException($e, [
-						'message' => "Can't send new user mail to $email",
-						'level' => \OCP\Util::ERROR,
-						'app' => 'ocs_api',
-					]);
-					throw new OCSException('Unable to send the invitation mail', 109);
-				}
-			}
-
-			return new DataResponse();
-
-		} catch (HintException $e ) {
-			$this->logger->logException($e, [
-				'message' => 'Failed addUser attempt with hint exception.',
-				'level' => \OCP\Util::WARN,
-				'app' => 'ocs_api',
-			]);
-			throw new OCSException($e->getHint(), 107);
-		} catch (\Exception $e) {
-			$this->logger->logException($e, [
-				'message' => 'Failed addUser attempt with exception.',
-				'level' => \OCP\Util::ERROR,
-				'app' => 'ocs_api',
-			]);
-			throw new OCSException('Bad request', 101);
-		}
-	}
-
-	/**
-	 * @NoAdminRequired
-	 * @NoSubAdminRequired
-	 *
-	 * gets user info
-	 *
-	 * @param string $userId
-	 * @return DataResponse
-	 * @throws OCSException
-	 */
-	public function getUser(string $userId): DataResponse {
-		$data = $this->getUserData($userId);
-		// getUserData returns empty array if not enough permissions
-		if (empty($data)) {
-			throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
-		}
-		return new DataResponse($data);
-	}
-
-	/**
-	 * @NoAdminRequired
-	 * @NoSubAdminRequired
-	 *
-	 * gets user info from the currently logged in user
-	 *
-	 * @return DataResponse
-	 * @throws OCSException
-	 */
-	public function getCurrentUser(): DataResponse {
-		$user = $this->userSession->getUser();
-		if ($user) {
-			$data =  $this->getUserData($user->getUID());
-			// rename "displayname" to "display-name" only for this call to keep
-			// the API stable.
-			$data['display-name'] = $data['displayname'];
-			unset($data['displayname']);
-			return new DataResponse($data);
-
-		}
-
-		throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
-	}
-
-	/**
-	 * @NoAdminRequired
-	 * @NoSubAdminRequired
-	 */
-	public function getEditableFields(): DataResponse {
-		$permittedFields = [];
-
-		// Editing self (display, email)
-		if ($this->config->getSystemValue('allow_user_to_change_display_name', true) !== false) {
-			$permittedFields[] = AccountManager::PROPERTY_DISPLAYNAME;
-			$permittedFields[] = AccountManager::PROPERTY_EMAIL;
-		}
-
-		if ($this->appManager->isEnabledForUser('federatedfilesharing')) {
-			$federatedFileSharing = $this->federatedFileSharingFactory->get();
-			$shareProvider = $federatedFileSharing->getFederatedShareProvider();
-			if ($shareProvider->isLookupServerUploadEnabled()) {
-				$permittedFields[] = AccountManager::PROPERTY_PHONE;
-				$permittedFields[] = AccountManager::PROPERTY_ADDRESS;
-				$permittedFields[] = AccountManager::PROPERTY_WEBSITE;
-				$permittedFields[] = AccountManager::PROPERTY_TWITTER;
-			}
-		}
-
-		return new DataResponse($permittedFields);
-	}
-
-	/**
-	 * @NoAdminRequired
-	 * @NoSubAdminRequired
-	 * @PasswordConfirmationRequired
-	 *
-	 * edit users
-	 *
-	 * @param string $userId
-	 * @param string $key
-	 * @param string $value
-	 * @return DataResponse
-	 * @throws OCSException
-	 */
-	public function editUser(string $userId, string $key, string $value): DataResponse {
-		$currentLoggedInUser = $this->userSession->getUser();
-
-		$targetUser = $this->userManager->get($userId);
-		if ($targetUser === null) {
-			throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
-		}
-
-		$permittedFields = [];
-		if ($targetUser->getUID() === $currentLoggedInUser->getUID()) {
-			// Editing self (display, email)
-			if ($this->config->getSystemValue('allow_user_to_change_display_name', true) !== false) {
-				$permittedFields[] = 'display';
-				$permittedFields[] = AccountManager::PROPERTY_DISPLAYNAME;
-				$permittedFields[] = AccountManager::PROPERTY_EMAIL;
-			}
-
-			$permittedFields[] = 'password';
-			if ($this->config->getSystemValue('force_language', false) === false ||
-				$this->groupManager->isAdmin($currentLoggedInUser->getUID())) {
-				$permittedFields[] = 'language';
-			}
-
-			if ($this->appManager->isEnabledForUser('federatedfilesharing')) {
-				$federatedFileSharing = new \OCA\FederatedFileSharing\AppInfo\Application();
-				$shareProvider = $federatedFileSharing->getFederatedShareProvider();
-				if ($shareProvider->isLookupServerUploadEnabled()) {
-					$permittedFields[] = AccountManager::PROPERTY_PHONE;
-					$permittedFields[] = AccountManager::PROPERTY_ADDRESS;
-					$permittedFields[] = AccountManager::PROPERTY_WEBSITE;
-					$permittedFields[] = AccountManager::PROPERTY_TWITTER;
-				}
-			}
-
-			// If admin they can edit their own quota
-			if ($this->groupManager->isAdmin($currentLoggedInUser->getUID())) {
-				$permittedFields[] = 'quota';
-			}
-		} else {
-			// Check if admin / subadmin
-			$subAdminManager = $this->groupManager->getSubAdmin();
-			if ($subAdminManager->isUserAccessible($currentLoggedInUser, $targetUser)
-			|| $this->groupManager->isAdmin($currentLoggedInUser->getUID())) {
-				// They have permissions over the user
-				$permittedFields[] = 'display';
-				$permittedFields[] = AccountManager::PROPERTY_DISPLAYNAME;
-				$permittedFields[] = AccountManager::PROPERTY_EMAIL;
-				$permittedFields[] = 'password';
-				$permittedFields[] = 'language';
-				$permittedFields[] = AccountManager::PROPERTY_PHONE;
-				$permittedFields[] = AccountManager::PROPERTY_ADDRESS;
-				$permittedFields[] = AccountManager::PROPERTY_WEBSITE;
-				$permittedFields[] = AccountManager::PROPERTY_TWITTER;
-				$permittedFields[] = 'quota';
-			} else {
-				// No rights
-				throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
-			}
-		}
-		// Check if permitted to edit this field
-		if (!in_array($key, $permittedFields)) {
-			throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
-		}
-		// Process the edit
-		switch($key) {
-			case 'display':
-			case AccountManager::PROPERTY_DISPLAYNAME:
-				$targetUser->setDisplayName($value);
-				break;
-			case 'quota':
-				$quota = $value;
-				if ($quota !== 'none' && $quota !== 'default') {
-					if (is_numeric($quota)) {
-						$quota = (float) $quota;
-					} else {
-						$quota = \OCP\Util::computerFileSize($quota);
-					}
-					if ($quota === false) {
-						throw new OCSException('Invalid quota value '.$value, 103);
-					}
-					if ($quota === 0) {
-						$quota = 'default';
-					}else if ($quota === -1) {
-						$quota = 'none';
-					} else {
-						$quota = \OCP\Util::humanFileSize($quota);
-					}
-				}
-				$targetUser->setQuota($quota);
-				break;
-			case 'password':
-				$targetUser->setPassword($value);
-				break;
-			case 'language':
-				$languagesCodes = $this->l10nFactory->findAvailableLanguages();
-				if (!in_array($value, $languagesCodes, true) && $value !== 'en') {
-					throw new OCSException('Invalid language', 102);
-				}
-				$this->config->setUserValue($targetUser->getUID(), 'core', 'lang', $value);
-				break;
-			case AccountManager::PROPERTY_EMAIL:
-				if (filter_var($value, FILTER_VALIDATE_EMAIL) || $value === '') {
-					$targetUser->setEMailAddress($value);
-				} else {
-					throw new OCSException('', 102);
-				}
-				break;
-			case AccountManager::PROPERTY_PHONE:
-			case AccountManager::PROPERTY_ADDRESS:
-			case AccountManager::PROPERTY_WEBSITE:
-			case AccountManager::PROPERTY_TWITTER:
-				$userAccount = $this->accountManager->getUser($targetUser);
-				if ($userAccount[$key]['value'] !== $value) {
-					$userAccount[$key]['value'] = $value;
-					$this->accountManager->updateUser($targetUser, $userAccount);
-				}
-				break;
-			default:
-				throw new OCSException('', 103);
-		}
-		return new DataResponse();
-	}
-
-	/**
-	 * @PasswordConfirmationRequired
-	 * @NoAdminRequired
-	 *
-	 * @param string $userId
-	 * @return DataResponse
-	 * @throws OCSException
-	 */
-	public function deleteUser(string $userId): DataResponse {
-		$currentLoggedInUser = $this->userSession->getUser();
-
-		$targetUser = $this->userManager->get($userId);
-
-		if ($targetUser === null || $targetUser->getUID() === $currentLoggedInUser->getUID()) {
-			throw new OCSException('', 101);
-		}
-
-		// If not permitted
-		$subAdminManager = $this->groupManager->getSubAdmin();
-		if (!$this->groupManager->isAdmin($currentLoggedInUser->getUID()) && !$subAdminManager->isUserAccessible($currentLoggedInUser, $targetUser)) {
-			throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
-		}
-
-		// Go ahead with the delete
-		if ($targetUser->delete()) {
-			return new DataResponse();
-		} else {
-			throw new OCSException('', 101);
-		}
-	}
-
-	/**
-	 * @PasswordConfirmationRequired
-	 * @NoAdminRequired
-	 *
-	 * @param string $userId
-	 * @return DataResponse
-	 * @throws OCSException
-	 * @throws OCSForbiddenException
-	 */
-	public function disableUser(string $userId): DataResponse {
-		return $this->setEnabled($userId, false);
-	}
-
-	/**
-	 * @PasswordConfirmationRequired
-	 * @NoAdminRequired
-	 *
-	 * @param string $userId
-	 * @return DataResponse
-	 * @throws OCSException
-	 * @throws OCSForbiddenException
-	 */
-	public function enableUser(string $userId): DataResponse {
-		return $this->setEnabled($userId, true);
-	}
-
-	/**
-	 * @param string $userId
-	 * @param bool $value
-	 * @return DataResponse
-	 * @throws OCSException
-	 */
-	private function setEnabled(string $userId, bool $value): DataResponse {
-		$currentLoggedInUser = $this->userSession->getUser();
-
-		$targetUser = $this->userManager->get($userId);
-		if ($targetUser === null || $targetUser->getUID() === $currentLoggedInUser->getUID()) {
-			throw new OCSException('', 101);
-		}
-
-		// If not permitted
-		$subAdminManager = $this->groupManager->getSubAdmin();
-		if (!$this->groupManager->isAdmin($currentLoggedInUser->getUID()) && !$subAdminManager->isUserAccessible($currentLoggedInUser, $targetUser)) {
-			throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
-		}
-
-		// enable/disable the user now
-		$targetUser->setEnabled($value);
-		return new DataResponse();
-	}
-
-	/**
-	 * @NoAdminRequired
-	 * @NoSubAdminRequired
-	 *
-	 * @param string $userId
-	 * @return DataResponse
-	 * @throws OCSException
-	 */
-	public function getUsersGroups(string $userId): DataResponse {
-		$loggedInUser = $this->userSession->getUser();
-
-		$targetUser = $this->userManager->get($userId);
-		if ($targetUser === null) {
-			throw new OCSException('', \OCP\API::RESPOND_NOT_FOUND);
-		}
-
-		if ($targetUser->getUID() === $loggedInUser->getUID() || $this->groupManager->isAdmin($loggedInUser->getUID())) {
-			// Self lookup or admin lookup
-			return new DataResponse([
-				'groups' => $this->groupManager->getUserGroupIds($targetUser)
-			]);
-		} else {
-			$subAdminManager = $this->groupManager->getSubAdmin();
-
-			// Looking up someone else
-			if ($subAdminManager->isUserAccessible($loggedInUser, $targetUser)) {
-				// Return the group that the method caller is subadmin of for the user in question
-				/** @var IGroup[] $getSubAdminsGroups */
-				$getSubAdminsGroups = $subAdminManager->getSubAdminsGroups($loggedInUser);
-				foreach ($getSubAdminsGroups as $key => $group) {
-					$getSubAdminsGroups[$key] = $group->getGID();
-				}
-				$groups = array_intersect(
-					$getSubAdminsGroups,
-					$this->groupManager->getUserGroupIds($targetUser)
-				);
-				return new DataResponse(['groups' => $groups]);
-			} else {
-				// Not permitted
-				throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
-			}
-		}
-
-	}
-
-	/**
-	 * @PasswordConfirmationRequired
-	 * @NoAdminRequired
-	 *
-	 * @param string $userId
-	 * @param string $groupid
-	 * @return DataResponse
-	 * @throws OCSException
-	 */
-	public function addToGroup(string $userId, string $groupid = ''): DataResponse {
-		if ($groupid === '') {
-			throw new OCSException('', 101);
-		}
-
-		$group = $this->groupManager->get($groupid);
-		$targetUser = $this->userManager->get($userId);
-		if ($group === null) {
-			throw new OCSException('', 102);
-		}
-		if ($targetUser === null) {
-			throw new OCSException('', 103);
-		}
-
-		// If they're not an admin, check they are a subadmin of the group in question
-		$loggedInUser = $this->userSession->getUser();
-		$subAdminManager = $this->groupManager->getSubAdmin();
-		if (!$this->groupManager->isAdmin($loggedInUser->getUID()) && !$subAdminManager->isSubAdminOfGroup($loggedInUser, $group)) {
-			throw new OCSException('', 104);
-		}
-
-		// Add user to group
-		$group->addUser($targetUser);
-		return new DataResponse();
-	}
-
-	/**
-	 * @PasswordConfirmationRequired
-	 * @NoAdminRequired
-	 *
-	 * @param string $userId
-	 * @param string $groupid
-	 * @return DataResponse
-	 * @throws OCSException
-	 */
-	public function removeFromGroup(string $userId, string $groupid): DataResponse {
-		$loggedInUser = $this->userSession->getUser();
-
-		if ($groupid === null || trim($groupid) === '') {
-			throw new OCSException('', 101);
-		}
-
-		$group = $this->groupManager->get($groupid);
-		if ($group === null) {
-			throw new OCSException('', 102);
-		}
-
-		$targetUser = $this->userManager->get($userId);
-		if ($targetUser === null) {
-			throw new OCSException('', 103);
-		}
-
-		// If they're not an admin, check they are a subadmin of the group in question
-		$subAdminManager = $this->groupManager->getSubAdmin();
-		if (!$this->groupManager->isAdmin($loggedInUser->getUID()) && !$subAdminManager->isSubAdminOfGroup($loggedInUser, $group)) {
-			throw new OCSException('', 104);
-		}
-
-		// Check they aren't removing themselves from 'admin' or their 'subadmin; group
-		if ($targetUser->getUID() === $loggedInUser->getUID()) {
-			if ($this->groupManager->isAdmin($loggedInUser->getUID())) {
-				if ($group->getGID() === 'admin') {
-					throw new OCSException('Cannot remove yourself from the admin group', 105);
-				}
-			} else {
-				// Not an admin, so the user must be a subadmin of this group, but that is not allowed.
-				throw new OCSException('Cannot remove yourself from this group as you are a SubAdmin', 105);
-			}
-
-		} else if (!$this->groupManager->isAdmin($loggedInUser->getUID())) {
-			/** @var IGroup[] $subAdminGroups */
-			$subAdminGroups = $subAdminManager->getSubAdminsGroups($loggedInUser);
-			$subAdminGroups = array_map(function (IGroup $subAdminGroup) {
-				return $subAdminGroup->getGID();
-			}, $subAdminGroups);
-			$userGroups = $this->groupManager->getUserGroupIds($targetUser);
-			$userSubAdminGroups = array_intersect($subAdminGroups, $userGroups);
-
-			if (count($userSubAdminGroups) <= 1) {
-				// Subadmin must not be able to remove a user from all their subadmin groups.
-				throw new OCSException('Cannot remove user from this group as this is the only remaining group you are a SubAdmin of', 105);
-			}
-		}
-
-		// Remove user from group
-		$group->removeUser($targetUser);
-		return new DataResponse();
-	}
-
-	/**
-	 * Creates a subadmin
-	 *
-	 * @PasswordConfirmationRequired
-	 *
-	 * @param string $userId
-	 * @param string $groupid
-	 * @return DataResponse
-	 * @throws OCSException
-	 */
-	public function addSubAdmin(string $userId, string $groupid): DataResponse {
-		$group = $this->groupManager->get($groupid);
-		$user = $this->userManager->get($userId);
-
-		// Check if the user exists
-		if ($user === null) {
-			throw new OCSException('User does not exist', 101);
-		}
-		// Check if group exists
-		if ($group === null) {
-			throw new OCSException('Group does not exist',  102);
-		}
-		// Check if trying to make subadmin of admin group
-		if ($group->getGID() === 'admin') {
-			throw new OCSException('Cannot create subadmins for admin group', 103);
-		}
-
-		$subAdminManager = $this->groupManager->getSubAdmin();
-
-		// We cannot be subadmin twice
-		if ($subAdminManager->isSubAdminOfGroup($user, $group)) {
-			return new DataResponse();
-		}
-		// Go
-		if ($subAdminManager->createSubAdmin($user, $group)) {
-			return new DataResponse();
-		} else {
-			throw new OCSException('Unknown error occurred', 103);
-		}
-	}
-
-	/**
-	 * Removes a subadmin from a group
-	 *
-	 * @PasswordConfirmationRequired
-	 *
-	 * @param string $userId
-	 * @param string $groupid
-	 * @return DataResponse
-	 * @throws OCSException
-	 */
-	public function removeSubAdmin(string $userId, string $groupid): DataResponse {
-		$group = $this->groupManager->get($groupid);
-		$user = $this->userManager->get($userId);
-		$subAdminManager = $this->groupManager->getSubAdmin();
-
-		// Check if the user exists
-		if ($user === null) {
-			throw new OCSException('User does not exist', 101);
-		}
-		// Check if the group exists
-		if ($group === null) {
-			throw new OCSException('Group does not exist', 101);
-		}
-		// Check if they are a subadmin of this said group
-		if (!$subAdminManager->isSubAdminOfGroup($user, $group)) {
-			throw new OCSException('User is not a subadmin of this group', 102);
-		}
-
-		// Go
-		if ($subAdminManager->deleteSubAdmin($user, $group)) {
-			return new DataResponse();
-		} else {
-			throw new OCSException('Unknown error occurred', 103);
-		}
-	}
-
-	/**
-	 * Get the groups a user is a subadmin of
-	 *
-	 * @param string $userId
-	 * @return DataResponse
-	 * @throws OCSException
-	 */
-	public function getUserSubAdminGroups(string $userId): DataResponse {
-		$groups = $this->getUserSubAdminGroupsData($userId);
-		return new DataResponse($groups);
-	}
-
-	/**
-	 * @NoAdminRequired
-	 * @PasswordConfirmationRequired
-	 *
-	 * resend welcome message
-	 *
-	 * @param string $userId
-	 * @return DataResponse
-	 * @throws OCSException
-	 */
-	public function resendWelcomeMessage(string $userId): DataResponse {
-		$currentLoggedInUser = $this->userSession->getUser();
-
-		$targetUser = $this->userManager->get($userId);
-		if ($targetUser === null) {
-			throw new OCSException('', \OCP\API::RESPOND_NOT_FOUND);
-		}
-
-		// Check if admin / subadmin
-		$subAdminManager = $this->groupManager->getSubAdmin();
-		if (!$subAdminManager->isUserAccessible($currentLoggedInUser, $targetUser)
-			&& !$this->groupManager->isAdmin($currentLoggedInUser->getUID())) {
-			// No rights
-			throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
-		}
-
-		$email = $targetUser->getEMailAddress();
-		if ($email === '' || $email === null) {
-			throw new OCSException('Email address not available', 101);
-		}
-		$username = $targetUser->getUID();
-		$lang = $this->config->getUserValue($username, 'core', 'lang', 'en');
-		if (!$this->l10nFactory->languageExists('settings', $lang)) {
-			$lang = 'en';
-		}
-
-		$l10n = $this->l10nFactory->get('settings', $lang);
-
-		try {
-			$this->newUserMailHelper->setL10N($l10n);
-			$emailTemplate = $this->newUserMailHelper->generateTemplate($targetUser, false);
-			$this->newUserMailHelper->sendMail($targetUser, $emailTemplate);
-		} catch(\Exception $e) {
-			$this->logger->logException($e, [
-				'message' => "Can't send new user mail to $email",
-				'level' => \OCP\Util::ERROR,
-				'app' => 'settings',
-			]);
-			throw new OCSException('Sending email failed', 102);
-		}
-
-		return new DataResponse();
-	}
+    /** @var IAppManager */
+    private $appManager;
+    /** @var ILogger */
+    private $logger;
+    /** @var IFactory */
+    private $l10nFactory;
+    /** @var NewUserMailHelper */
+    private $newUserMailHelper;
+    /** @var FederatedFileSharingFactory */
+    private $federatedFileSharingFactory;
+    /** @var ISecureRandom */
+    private $secureRandom;
+
+    /**
+     * @param string $appName
+     * @param IRequest $request
+     * @param IUserManager $userManager
+     * @param IConfig $config
+     * @param IAppManager $appManager
+     * @param IGroupManager $groupManager
+     * @param IUserSession $userSession
+     * @param AccountManager $accountManager
+     * @param ILogger $logger
+     * @param IFactory $l10nFactory
+     * @param NewUserMailHelper $newUserMailHelper
+     * @param FederatedFileSharingFactory $federatedFileSharingFactory
+     * @param ISecureRandom $secureRandom
+     */
+    public function __construct(string $appName,
+                                IRequest $request,
+                                IUserManager $userManager,
+                                IConfig $config,
+                                IAppManager $appManager,
+                                IGroupManager $groupManager,
+                                IUserSession $userSession,
+                                AccountManager $accountManager,
+                                ILogger $logger,
+                                IFactory $l10nFactory,
+                                NewUserMailHelper $newUserMailHelper,
+                                FederatedFileSharingFactory $federatedFileSharingFactory,
+                                ISecureRandom $secureRandom) {
+        parent::__construct($appName,
+                            $request,
+                            $userManager,
+                            $config,
+                            $groupManager,
+                            $userSession,
+                            $accountManager);
+
+        $this->appManager = $appManager;
+        $this->logger = $logger;
+        $this->l10nFactory = $l10nFactory;
+        $this->newUserMailHelper = $newUserMailHelper;
+        $this->federatedFileSharingFactory = $federatedFileSharingFactory;
+        $this->secureRandom = $secureRandom;
+    }
+
+    /**
+     * @NoAdminRequired
+     *
+     * returns a list of users
+     *
+     * @param string $search
+     * @param int $limit
+     * @param int $offset
+     * @return DataResponse
+     */
+    public function getUsers(string $search = '', $limit = null, $offset = 0): DataResponse {
+        $user = $this->userSession->getUser();
+        $users = [];
+
+        // Admin? Or SubAdmin?
+        $uid = $user->getUID();
+        $subAdminManager = $this->groupManager->getSubAdmin();
+        if ($this->groupManager->isAdmin($uid)){
+            $users = $this->userManager->search($search, $limit, $offset);
+        } else if ($subAdminManager->isSubAdmin($user)) {
+            $subAdminOfGroups = $subAdminManager->getSubAdminsGroups($user);
+            foreach ($subAdminOfGroups as $key => $group) {
+                $subAdminOfGroups[$key] = $group->getGID();
+            }
+
+            $users = [];
+            foreach ($subAdminOfGroups as $group) {
+                $users = array_merge($users, $this->groupManager->displayNamesInGroup($group, $search, $limit, $offset));
+            }
+        }
+
+        $users = array_keys($users);
+
+        return new DataResponse([
+            'users' => $users
+        ]);
+    }
+
+    /**
+     * @NoAdminRequired
+     *
+     * returns a list of users and their data
+     */
+    public function getUsersDetails(string $search = '', $limit = null, $offset = 0): DataResponse {
+        $user = $this->userSession->getUser();
+        $users = [];
+
+        // Admin? Or SubAdmin?
+        $uid = $user->getUID();
+        $subAdminManager = $this->groupManager->getSubAdmin();
+        if ($this->groupManager->isAdmin($uid)){
+            $users = $this->userManager->search($search, $limit, $offset);
+        } else if ($subAdminManager->isSubAdmin($user)) {
+            $subAdminOfGroups = $subAdminManager->getSubAdminsGroups($user);
+            foreach ($subAdminOfGroups as $key => $group) {
+                $subAdminOfGroups[$key] = $group->getGID();
+            }
+
+            $users = [];
+            foreach ($subAdminOfGroups as $group) {
+                $users = array_merge($users, $this->groupManager->displayNamesInGroup($group, $search, $limit, $offset));
+            }
+        }
+
+        $users = array_keys($users);
+        $usersDetails = [];
+        foreach ($users as $key => $userId) {
+            $userData = $this->getUserData($userId);
+            // Do not insert empty entry
+            if (!empty($userData)) {
+                $usersDetails[$userId] = $userData;
+            }
+        }
+
+        return new DataResponse([
+            'users' => $usersDetails
+        ]);
+    }
+
+    /**
+     * @PasswordConfirmationRequired
+     * @NoAdminRequired
+     *
+     * @param string $userid
+     * @param string $password
+     * @param string $email
+     * @param array $groups
+     * @param array $subadmins
+     * @param string $quota
+     * @return DataResponse
+     * @throws OCSException
+     */
+    public function addUser(string $userid,
+                            string $password = '',
+                            string $email = '',
+                            array $groups = [],
+                            array $subadmin = [],
+                            string $quota = ''): DataResponse {
+        $user = $this->userSession->getUser();
+        $isAdmin = $this->groupManager->isAdmin($user->getUID());
+        $subAdminManager = $this->groupManager->getSubAdmin();
+
+        if ($this->userManager->userExists($userid)) {
+            $this->logger->error('Failed addUser attempt: User already exists.', ['app' => 'ocs_api']);
+            throw new OCSException('User already exists', 102);
+        }
+
+        if ($groups !== []) {
+            foreach ($groups as $group) {
+                if (!$this->groupManager->groupExists($group)) {
+                    throw new OCSException('group '.$group.' does not exist', 104);
+                }
+                if (!$isAdmin && !$subAdminManager->isSubAdminOfGroup($user, $this->groupManager->get($group))) {
+                    throw new OCSException('insufficient privileges for group '. $group, 105);
+                }
+            }
+        } else {
+            if (!$isAdmin) {
+                throw new OCSException('no group specified (required for subadmins)', 106);
+            }
+        }
+
+        $subadminGroups = [];
+        if ($subadmin !== []) {
+            foreach ($subadmin as $groupid) {
+                $group = $this->groupManager->get($groupid);
+                // Check if group exists
+                if ($group === null) {
+                    throw new OCSException('Subadmin group does not exist',  102);
+                }
+                // Check if trying to make subadmin of admin group
+                if ($group->getGID() === 'admin') {
+                    throw new OCSException('Cannot create subadmins for admin group', 103);
+                }
+                // Check if has permission to promote subadmins
+                if (!$subAdminManager->isSubAdminOfGroup($user, $group) && !$isAdmin) {
+                    throw new OCSForbiddenException('No permissions to promote subadmins');
+                }
+                $subadminGroups[] = $group;
+            }
+        }
+
+        $generatePasswordResetToken = false;
+        if ($password === '') {
+            if ($email === '') {
+                throw new OCSException('To send a password link to the user an email address is required.', 108);
+            }
+
+            $password = $this->secureRandom->generate(10);
+            // Make sure we pass the password_policy
+            $password .= $this->secureRandom->generate(2, '$!.,;:-~+*[]{}()');
+            $generatePasswordResetToken = true;
+        }
+
+        try {
+            $newUser = $this->userManager->createUser($userid, $password);
+            $this->logger->info('Successful addUser call with userid: ' . $userid, ['app' => 'ocs_api']);
+
+            foreach ($groups as $group) {
+                $this->groupManager->get($group)->addUser($newUser);
+                $this->logger->info('Added userid ' . $userid . ' to group ' . $group, ['app' => 'ocs_api']);
+            }
+            foreach ($subadminGroups as $group) {
+                $subAdminManager->createSubAdmin($newUser, $group);
+            }
+
+            if ($quota !== '') {
+                $this->editUser($userid, 'quota', $quota);
+            }
+
+            // Send new user mail only if a mail is set
+            if ($email !== '') {
+                $newUser->setEMailAddress($email);
+                try {
+                    $emailTemplate = $this->newUserMailHelper->generateTemplate($newUser, $generatePasswordResetToken);
+                    $this->newUserMailHelper->sendMail($newUser, $emailTemplate);
+                } catch (\Exception $e) {
+                    $this->logger->logException($e, [
+                        'message' => "Can't send new user mail to $email",
+                        'level' => \OCP\Util::ERROR,
+                        'app' => 'ocs_api',
+                    ]);
+                    throw new OCSException('Unable to send the invitation mail', 109);
+                }
+            }
+
+            return new DataResponse();
+
+        } catch (HintException $e ) {
+            $this->logger->logException($e, [
+                'message' => 'Failed addUser attempt with hint exception.',
+                'level' => \OCP\Util::WARN,
+                'app' => 'ocs_api',
+            ]);
+            throw new OCSException($e->getHint(), 107);
+        } catch (\Exception $e) {
+            $this->logger->logException($e, [
+                'message' => 'Failed addUser attempt with exception.',
+                'level' => \OCP\Util::ERROR,
+                'app' => 'ocs_api',
+            ]);
+            throw new OCSException('Bad request', 101);
+        }
+    }
+
+    /**
+     * @NoAdminRequired
+     * @NoSubAdminRequired
+     *
+     * gets user info
+     *
+     * @param string $userId
+     * @return DataResponse
+     * @throws OCSException
+     */
+    public function getUser(string $userId): DataResponse {
+        $data = $this->getUserData($userId);
+        // getUserData returns empty array if not enough permissions
+        if (empty($data)) {
+            throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
+        }
+        return new DataResponse($data);
+    }
+
+    /**
+     * @NoAdminRequired
+     * @NoSubAdminRequired
+     *
+     * gets user info from the currently logged in user
+     *
+     * @return DataResponse
+     * @throws OCSException
+     */
+    public function getCurrentUser(): DataResponse {
+        $user = $this->userSession->getUser();
+        if ($user) {
+            $data =  $this->getUserData($user->getUID());
+            // rename "displayname" to "display-name" only for this call to keep
+            // the API stable.
+            $data['display-name'] = $data['displayname'];
+            unset($data['displayname']);
+            return new DataResponse($data);
+
+        }
+
+        throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
+    }
+
+    /**
+     * @NoAdminRequired
+     * @NoSubAdminRequired
+     */
+    public function getEditableFields(): DataResponse {
+        $permittedFields = [];
+
+        // Editing self (display, email)
+        if ($this->config->getSystemValue('allow_user_to_change_display_name', true) !== false) {
+            $permittedFields[] = AccountManager::PROPERTY_DISPLAYNAME;
+            $permittedFields[] = AccountManager::PROPERTY_EMAIL;
+        }
+
+        if ($this->appManager->isEnabledForUser('federatedfilesharing')) {
+            $federatedFileSharing = $this->federatedFileSharingFactory->get();
+            $shareProvider = $federatedFileSharing->getFederatedShareProvider();
+            if ($shareProvider->isLookupServerUploadEnabled()) {
+                $permittedFields[] = AccountManager::PROPERTY_PHONE;
+                $permittedFields[] = AccountManager::PROPERTY_ADDRESS;
+                $permittedFields[] = AccountManager::PROPERTY_WEBSITE;
+                $permittedFields[] = AccountManager::PROPERTY_TWITTER;
+            }
+        }
+
+        return new DataResponse($permittedFields);
+    }
+
+    /**
+     * @NoAdminRequired
+     * @NoSubAdminRequired
+     * @PasswordConfirmationRequired
+     *
+     * edit users
+     *
+     * @param string $userId
+     * @param string $key
+     * @param string $value
+     * @return DataResponse
+     * @throws OCSException
+     */
+    public function editUser(string $userId, string $key, string $value): DataResponse {
+        $currentLoggedInUser = $this->userSession->getUser();
+
+        $targetUser = $this->userManager->get($userId);
+        if ($targetUser === null) {
+            throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
+        }
+
+        $permittedFields = [];
+        if ($targetUser->getUID() === $currentLoggedInUser->getUID()) {
+            // Editing self (display, email)
+            if ($this->config->getSystemValue('allow_user_to_change_display_name', true) !== false) {
+                $permittedFields[] = 'display';
+                $permittedFields[] = AccountManager::PROPERTY_DISPLAYNAME;
+                $permittedFields[] = AccountManager::PROPERTY_EMAIL;
+            }
+
+            $permittedFields[] = 'password';
+            if ($this->config->getSystemValue('force_language', false) === false ||
+                $this->groupManager->isAdmin($currentLoggedInUser->getUID())) {
+                $permittedFields[] = 'language';
+            }
+
+            if ($this->appManager->isEnabledForUser('federatedfilesharing')) {
+                $federatedFileSharing = new \OCA\FederatedFileSharing\AppInfo\Application();
+                $shareProvider = $federatedFileSharing->getFederatedShareProvider();
+                if ($shareProvider->isLookupServerUploadEnabled()) {
+                    $permittedFields[] = AccountManager::PROPERTY_PHONE;
+                    $permittedFields[] = AccountManager::PROPERTY_ADDRESS;
+                    $permittedFields[] = AccountManager::PROPERTY_WEBSITE;
+                    $permittedFields[] = AccountManager::PROPERTY_TWITTER;
+                }
+            }
+
+            // If admin they can edit their own quota
+            if ($this->groupManager->isAdmin($currentLoggedInUser->getUID())) {
+                $permittedFields[] = 'quota';
+            }
+        } else {
+            // Check if admin / subadmin
+            $subAdminManager = $this->groupManager->getSubAdmin();
+            if ($subAdminManager->isUserAccessible($currentLoggedInUser, $targetUser)
+            || $this->groupManager->isAdmin($currentLoggedInUser->getUID())) {
+                // They have permissions over the user
+                $permittedFields[] = 'display';
+                $permittedFields[] = AccountManager::PROPERTY_DISPLAYNAME;
+                $permittedFields[] = AccountManager::PROPERTY_EMAIL;
+                $permittedFields[] = 'password';
+                $permittedFields[] = 'language';
+                $permittedFields[] = AccountManager::PROPERTY_PHONE;
+                $permittedFields[] = AccountManager::PROPERTY_ADDRESS;
+                $permittedFields[] = AccountManager::PROPERTY_WEBSITE;
+                $permittedFields[] = AccountManager::PROPERTY_TWITTER;
+                $permittedFields[] = 'quota';
+            } else {
+                // No rights
+                throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
+            }
+        }
+        // Check if permitted to edit this field
+        if (!in_array($key, $permittedFields)) {
+            throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
+        }
+        // Process the edit
+        switch($key) {
+            case 'display':
+            case AccountManager::PROPERTY_DISPLAYNAME:
+                $targetUser->setDisplayName($value);
+                break;
+            case 'quota':
+                $quota = $value;
+                if ($quota !== 'none' && $quota !== 'default') {
+                    if (is_numeric($quota)) {
+                        $quota = (float) $quota;
+                    } else {
+                        $quota = \OCP\Util::computerFileSize($quota);
+                    }
+                    if ($quota === false) {
+                        throw new OCSException('Invalid quota value '.$value, 103);
+                    }
+                    if ($quota === 0) {
+                        $quota = 'default';
+                    }else if ($quota === -1) {
+                        $quota = 'none';
+                    } else {
+                        $quota = \OCP\Util::humanFileSize($quota);
+                    }
+                }
+                $targetUser->setQuota($quota);
+                break;
+            case 'password':
+                $targetUser->setPassword($value);
+                break;
+            case 'language':
+                $languagesCodes = $this->l10nFactory->findAvailableLanguages();
+                if (!in_array($value, $languagesCodes, true) && $value !== 'en') {
+                    throw new OCSException('Invalid language', 102);
+                }
+                $this->config->setUserValue($targetUser->getUID(), 'core', 'lang', $value);
+                break;
+            case AccountManager::PROPERTY_EMAIL:
+                if (filter_var($value, FILTER_VALIDATE_EMAIL) || $value === '') {
+                    $targetUser->setEMailAddress($value);
+                } else {
+                    throw new OCSException('', 102);
+                }
+                break;
+            case AccountManager::PROPERTY_PHONE:
+            case AccountManager::PROPERTY_ADDRESS:
+            case AccountManager::PROPERTY_WEBSITE:
+            case AccountManager::PROPERTY_TWITTER:
+                $userAccount = $this->accountManager->getUser($targetUser);
+                if ($userAccount[$key]['value'] !== $value) {
+                    $userAccount[$key]['value'] = $value;
+                    $this->accountManager->updateUser($targetUser, $userAccount);
+                }
+                break;
+            default:
+                throw new OCSException('', 103);
+        }
+        return new DataResponse();
+    }
+
+    /**
+     * @PasswordConfirmationRequired
+     * @NoAdminRequired
+     *
+     * @param string $userId
+     * @return DataResponse
+     * @throws OCSException
+     */
+    public function deleteUser(string $userId): DataResponse {
+        $currentLoggedInUser = $this->userSession->getUser();
+
+        $targetUser = $this->userManager->get($userId);
+
+        if ($targetUser === null || $targetUser->getUID() === $currentLoggedInUser->getUID()) {
+            throw new OCSException('', 101);
+        }
+
+        // If not permitted
+        $subAdminManager = $this->groupManager->getSubAdmin();
+        if (!$this->groupManager->isAdmin($currentLoggedInUser->getUID()) && !$subAdminManager->isUserAccessible($currentLoggedInUser, $targetUser)) {
+            throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
+        }
+
+        // Go ahead with the delete
+        if ($targetUser->delete()) {
+            return new DataResponse();
+        } else {
+            throw new OCSException('', 101);
+        }
+    }
+
+    /**
+     * @PasswordConfirmationRequired
+     * @NoAdminRequired
+     *
+     * @param string $userId
+     * @return DataResponse
+     * @throws OCSException
+     * @throws OCSForbiddenException
+     */
+    public function disableUser(string $userId): DataResponse {
+        return $this->setEnabled($userId, false);
+    }
+
+    /**
+     * @PasswordConfirmationRequired
+     * @NoAdminRequired
+     *
+     * @param string $userId
+     * @return DataResponse
+     * @throws OCSException
+     * @throws OCSForbiddenException
+     */
+    public function enableUser(string $userId): DataResponse {
+        return $this->setEnabled($userId, true);
+    }
+
+    /**
+     * @param string $userId
+     * @param bool $value
+     * @return DataResponse
+     * @throws OCSException
+     */
+    private function setEnabled(string $userId, bool $value): DataResponse {
+        $currentLoggedInUser = $this->userSession->getUser();
+
+        $targetUser = $this->userManager->get($userId);
+        if ($targetUser === null || $targetUser->getUID() === $currentLoggedInUser->getUID()) {
+            throw new OCSException('', 101);
+        }
+
+        // If not permitted
+        $subAdminManager = $this->groupManager->getSubAdmin();
+        if (!$this->groupManager->isAdmin($currentLoggedInUser->getUID()) && !$subAdminManager->isUserAccessible($currentLoggedInUser, $targetUser)) {
+            throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
+        }
+
+        // enable/disable the user now
+        $targetUser->setEnabled($value);
+        return new DataResponse();
+    }
+
+    /**
+     * @NoAdminRequired
+     * @NoSubAdminRequired
+     *
+     * @param string $userId
+     * @return DataResponse
+     * @throws OCSException
+     */
+    public function getUsersGroups(string $userId): DataResponse {
+        $loggedInUser = $this->userSession->getUser();
+
+        $targetUser = $this->userManager->get($userId);
+        if ($targetUser === null) {
+            throw new OCSException('', \OCP\API::RESPOND_NOT_FOUND);
+        }
+
+        if ($targetUser->getUID() === $loggedInUser->getUID() || $this->groupManager->isAdmin($loggedInUser->getUID())) {
+            // Self lookup or admin lookup
+            return new DataResponse([
+                'groups' => $this->groupManager->getUserGroupIds($targetUser)
+            ]);
+        } else {
+            $subAdminManager = $this->groupManager->getSubAdmin();
+
+            // Looking up someone else
+            if ($subAdminManager->isUserAccessible($loggedInUser, $targetUser)) {
+                // Return the group that the method caller is subadmin of for the user in question
+                /** @var IGroup[] $getSubAdminsGroups */
+                $getSubAdminsGroups = $subAdminManager->getSubAdminsGroups($loggedInUser);
+                foreach ($getSubAdminsGroups as $key => $group) {
+                    $getSubAdminsGroups[$key] = $group->getGID();
+                }
+                $groups = array_intersect(
+                    $getSubAdminsGroups,
+                    $this->groupManager->getUserGroupIds($targetUser)
+                );
+                return new DataResponse(['groups' => $groups]);
+            } else {
+                // Not permitted
+                throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
+            }
+        }
+
+    }
+
+    /**
+     * @PasswordConfirmationRequired
+     * @NoAdminRequired
+     *
+     * @param string $userId
+     * @param string $groupid
+     * @return DataResponse
+     * @throws OCSException
+     */
+    public function addToGroup(string $userId, string $groupid = ''): DataResponse {
+        if ($groupid === '') {
+            throw new OCSException('', 101);
+        }
+
+        $group = $this->groupManager->get($groupid);
+        $targetUser = $this->userManager->get($userId);
+        if ($group === null) {
+            throw new OCSException('', 102);
+        }
+        if ($targetUser === null) {
+            throw new OCSException('', 103);
+        }
+
+        // If they're not an admin, check they are a subadmin of the group in question
+        $loggedInUser = $this->userSession->getUser();
+        $subAdminManager = $this->groupManager->getSubAdmin();
+        if (!$this->groupManager->isAdmin($loggedInUser->getUID()) && !$subAdminManager->isSubAdminOfGroup($loggedInUser, $group)) {
+            throw new OCSException('', 104);
+        }
+
+        // Add user to group
+        $group->addUser($targetUser);
+        return new DataResponse();
+    }
+
+    /**
+     * @PasswordConfirmationRequired
+     * @NoAdminRequired
+     *
+     * @param string $userId
+     * @param string $groupid
+     * @return DataResponse
+     * @throws OCSException
+     */
+    public function removeFromGroup(string $userId, string $groupid): DataResponse {
+        $loggedInUser = $this->userSession->getUser();
+
+        if ($groupid === null || trim($groupid) === '') {
+            throw new OCSException('', 101);
+        }
+
+        $group = $this->groupManager->get($groupid);
+        if ($group === null) {
+            throw new OCSException('', 102);
+        }
+
+        $targetUser = $this->userManager->get($userId);
+        if ($targetUser === null) {
+            throw new OCSException('', 103);
+        }
+
+        // If they're not an admin, check they are a subadmin of the group in question
+        $subAdminManager = $this->groupManager->getSubAdmin();
+        if (!$this->groupManager->isAdmin($loggedInUser->getUID()) && !$subAdminManager->isSubAdminOfGroup($loggedInUser, $group)) {
+            throw new OCSException('', 104);
+        }
+
+        // Check they aren't removing themselves from 'admin' or their 'subadmin; group
+        if ($targetUser->getUID() === $loggedInUser->getUID()) {
+            if ($this->groupManager->isAdmin($loggedInUser->getUID())) {
+                if ($group->getGID() === 'admin') {
+                    throw new OCSException('Cannot remove yourself from the admin group', 105);
+                }
+            } else {
+                // Not an admin, so the user must be a subadmin of this group, but that is not allowed.
+                throw new OCSException('Cannot remove yourself from this group as you are a SubAdmin', 105);
+            }
+
+        } else if (!$this->groupManager->isAdmin($loggedInUser->getUID())) {
+            /** @var IGroup[] $subAdminGroups */
+            $subAdminGroups = $subAdminManager->getSubAdminsGroups($loggedInUser);
+            $subAdminGroups = array_map(function (IGroup $subAdminGroup) {
+                return $subAdminGroup->getGID();
+            }, $subAdminGroups);
+            $userGroups = $this->groupManager->getUserGroupIds($targetUser);
+            $userSubAdminGroups = array_intersect($subAdminGroups, $userGroups);
+
+            if (count($userSubAdminGroups) <= 1) {
+                // Subadmin must not be able to remove a user from all their subadmin groups.
+                throw new OCSException('Cannot remove user from this group as this is the only remaining group you are a SubAdmin of', 105);
+            }
+        }
+
+        // Remove user from group
+        $group->removeUser($targetUser);
+        return new DataResponse();
+    }
+
+    /**
+     * Creates a subadmin
+     *
+     * @PasswordConfirmationRequired
+     *
+     * @param string $userId
+     * @param string $groupid
+     * @return DataResponse
+     * @throws OCSException
+     */
+    public function addSubAdmin(string $userId, string $groupid): DataResponse {
+        $group = $this->groupManager->get($groupid);
+        $user = $this->userManager->get($userId);
+
+        // Check if the user exists
+        if ($user === null) {
+            throw new OCSException('User does not exist', 101);
+        }
+        // Check if group exists
+        if ($group === null) {
+            throw new OCSException('Group does not exist',  102);
+        }
+        // Check if trying to make subadmin of admin group
+        if ($group->getGID() === 'admin') {
+            throw new OCSException('Cannot create subadmins for admin group', 103);
+        }
+
+        $subAdminManager = $this->groupManager->getSubAdmin();
+
+        // We cannot be subadmin twice
+        if ($subAdminManager->isSubAdminOfGroup($user, $group)) {
+            return new DataResponse();
+        }
+        // Go
+        if ($subAdminManager->createSubAdmin($user, $group)) {
+            return new DataResponse();
+        } else {
+            throw new OCSException('Unknown error occurred', 103);
+        }
+    }
+
+    /**
+     * Removes a subadmin from a group
+     *
+     * @PasswordConfirmationRequired
+     *
+     * @param string $userId
+     * @param string $groupid
+     * @return DataResponse
+     * @throws OCSException
+     */
+    public function removeSubAdmin(string $userId, string $groupid): DataResponse {
+        $group = $this->groupManager->get($groupid);
+        $user = $this->userManager->get($userId);
+        $subAdminManager = $this->groupManager->getSubAdmin();
+
+        // Check if the user exists
+        if ($user === null) {
+            throw new OCSException('User does not exist', 101);
+        }
+        // Check if the group exists
+        if ($group === null) {
+            throw new OCSException('Group does not exist', 101);
+        }
+        // Check if they are a subadmin of this said group
+        if (!$subAdminManager->isSubAdminOfGroup($user, $group)) {
+            throw new OCSException('User is not a subadmin of this group', 102);
+        }
+
+        // Go
+        if ($subAdminManager->deleteSubAdmin($user, $group)) {
+            return new DataResponse();
+        } else {
+            throw new OCSException('Unknown error occurred', 103);
+        }
+    }
+
+    /**
+     * Get the groups a user is a subadmin of
+     *
+     * @param string $userId
+     * @return DataResponse
+     * @throws OCSException
+     */
+    public function getUserSubAdminGroups(string $userId): DataResponse {
+        $groups = $this->getUserSubAdminGroupsData($userId);
+        return new DataResponse($groups);
+    }
+
+    /**
+     * @NoAdminRequired
+     * @PasswordConfirmationRequired
+     *
+     * resend welcome message
+     *
+     * @param string $userId
+     * @return DataResponse
+     * @throws OCSException
+     */
+    public function resendWelcomeMessage(string $userId): DataResponse {
+        $currentLoggedInUser = $this->userSession->getUser();
+
+        $targetUser = $this->userManager->get($userId);
+        if ($targetUser === null) {
+            throw new OCSException('', \OCP\API::RESPOND_NOT_FOUND);
+        }
+
+        // Check if admin / subadmin
+        $subAdminManager = $this->groupManager->getSubAdmin();
+        if (!$subAdminManager->isUserAccessible($currentLoggedInUser, $targetUser)
+            && !$this->groupManager->isAdmin($currentLoggedInUser->getUID())) {
+            // No rights
+            throw new OCSException('', \OCP\API::RESPOND_UNAUTHORISED);
+        }
+
+        $email = $targetUser->getEMailAddress();
+        if ($email === '' || $email === null) {
+            throw new OCSException('Email address not available', 101);
+        }
+        $username = $targetUser->getUID();
+        $lang = $this->config->getUserValue($username, 'core', 'lang', 'en');
+        if (!$this->l10nFactory->languageExists('settings', $lang)) {
+            $lang = 'en';
+        }
+
+        $l10n = $this->l10nFactory->get('settings', $lang);
+
+        try {
+            $this->newUserMailHelper->setL10N($l10n);
+            $emailTemplate = $this->newUserMailHelper->generateTemplate($targetUser, false);
+            $this->newUserMailHelper->sendMail($targetUser, $emailTemplate);
+        } catch(\Exception $e) {
+            $this->logger->logException($e, [
+                'message' => "Can't send new user mail to $email",
+                'level' => \OCP\Util::ERROR,
+                'app' => 'settings',
+            ]);
+            throw new OCSException('Sending email failed', 102);
+        }
+
+        return new DataResponse();
+    }
 }