FederatedUserService::deleteFederatedUser() - Code Metrics - Inspection of "return pure array" - nextcloud/circles - Measure and Improve Code Quality continuously with Scrutinizer

Completed
Push — master ( 1f8246...effc67 )

by Maxence
created 2021-06-08 13:15 UTC
FederatedUserService::deleteFederatedUser() A

↳ Parent: FederatedUserService
Complexity

Conditions	1
Paths	1
Size

Total Lines
Duplication

Lines	0
Ratio	0 %
Importance

Changes
Metric	Value
dl	0
loc	4
rs	10
c	0
b	0
f	0
cc	1
nc	1
nop	1
<?php

declare(strict_types=1);


/**
 * Circles - Bring cloud-users closer together.
 *
 * This file is licensed under the Affero General Public License version 3 or
 * later. See the COPYING file.
 *
 * @author Maxence Lange <[email protected]>
 * @copyright 2021
 * @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 OCA\Circles\Service;


use daita\MySmallPhpTools\Traits\Nextcloud\nc22\TNC22Logger;
use daita\MySmallPhpTools\Traits\TArrayTools;
use daita\MySmallPhpTools\Traits\TStringTools;
use Exception;
use OC;
use OCA\Circles\AppInfo\Application;
use OCA\Circles\Db\CircleRequest;
use OCA\Circles\Db\MemberRequest;
use OCA\Circles\Exceptions\CircleNotFoundException;
use OCA\Circles\Exceptions\ContactAddressBookNotFoundException;
use OCA\Circles\Exceptions\ContactFormatException;
use OCA\Circles\Exceptions\ContactNotFoundException;
use OCA\Circles\Exceptions\FederatedEventException;
use OCA\Circles\Exceptions\FederatedItemException;
use OCA\Circles\Exceptions\FederatedUserException;
use OCA\Circles\Exceptions\FederatedUserNotFoundException;
use OCA\Circles\Exceptions\GroupNotFoundException;
use OCA\Circles\Exceptions\InitiatorNotConfirmedException;
use OCA\Circles\Exceptions\InitiatorNotFoundException;
use OCA\Circles\Exceptions\InvalidIdException;
use OCA\Circles\Exceptions\MemberNotFoundException;
use OCA\Circles\Exceptions\OwnerNotFoundException;
use OCA\Circles\Exceptions\RemoteInstanceException;
use OCA\Circles\Exceptions\RemoteNotFoundException;
use OCA\Circles\Exceptions\RemoteResourceNotFoundException;
use OCA\Circles\Exceptions\RequestBuilderException;
use OCA\Circles\Exceptions\SingleCircleNotFoundException;
use OCA\Circles\Exceptions\UnknownRemoteException;
use OCA\Circles\Exceptions\UserTypeNotFoundException;
use OCA\Circles\FederatedItems\CircleCreate;
use OCA\Circles\IFederatedUser;
use OCA\Circles\Model\Circle;
use OCA\Circles\Model\Federated\FederatedEvent;
use OCA\Circles\Model\Federated\RemoteInstance;
use OCA\Circles\Model\FederatedUser;
use OCA\Circles\Model\ManagedModel;
use OCA\Circles\Model\Member;
use OCP\IGroupManager;
use OCP\IUser;
use OCP\IUserManager;
use OCP\IUserSession;


/**
 * Class FederatedUserService
 *
 * @package OCA\Circles\Service
 */
class FederatedUserService {


	use TArrayTools;
	use TStringTools;
	use TNC22Logger;


	/** @var IUserSession */
	private $userSession;

	/** @var IUserManager */
	private $userManager;

	/** @var IGroupManager */
	private $groupManager;

	/** @var FederatedEventService */
	private $federatedEventService;

	/** @var MembershipService */
	private $membershipService;

	/** @var CircleRequest */
	private $circleRequest;

	/** @var MemberRequest */
	private $memberRequest;

	/** @var RemoteService */
	private $remoteService;

	/** @var ContactService */
	private $contactService;

	/** @var InterfaceService */
	private $interfaceService;

	/** @var ConfigService */
	private $configService;


	/** @var FederatedUser */
	private $currentUser = null;

	/** @var FederatedUser */
	private $currentApp = null;

	/** @var RemoteInstance */
	private $remoteInstance = null;

	/** @var bool */
	private $bypass = false;

	/** @var bool */
	private $initiatedByOcc = false;


	/**
	 * FederatedUserService constructor.
	 *
	 * @param IUserSession $userSession
	 * @param IUserManager $userManager
	 * @param IGroupManager $groupManager
	 * @param FederatedEventService $federatedEventService
	 * @param MembershipService $membershipService
	 * @param CircleRequest $circleRequest
	 * @param MemberRequest $memberRequest
	 * @param RemoteService $remoteService
	 * @param ContactService $contactService
	 * @param InterfaceService $interfaceService
	 * @param ConfigService $configService
	 */
	public function __construct(
		IUserSession $userSession, IUserManager $userManager, IGroupManager $groupManager,
		FederatedEventService $federatedEventService, MembershipService $membershipService,
		CircleRequest $circleRequest, MemberRequest $memberRequest, RemoteService $remoteService,
		ContactService $contactService, InterfaceService $interfaceService, ConfigService $configService
	) {
		$this->userSession = $userSession;
		$this->userManager = $userManager;
		$this->groupManager = $groupManager;
		$this->federatedEventService = $federatedEventService;
		$this->membershipService = $membershipService;
		$this->circleRequest = $circleRequest;
		$this->memberRequest = $memberRequest;
		$this->remoteService = $remoteService;
		$this->contactService = $contactService;
		$this->interfaceService = $interfaceService;
		$this->configService = $configService;

		if (OC::$CLI) {
			$this->setInitiatedByOcc(true);
		}
	}


	/**
	 * @throws FederatedUserException
	 * @throws FederatedUserNotFoundException
	 * @throws InvalidIdException
	 * @throws SingleCircleNotFoundException
	 * @throws RequestBuilderException
	 */
	public function initCurrentUser() {
		$user = $this->userSession->getUser();
		if ($user === null) {
			return;
		}

		$this->setLocalCurrentUser($user);
	}


	/**
	 * @param IUser|null $user
	 *
	 * @throws FederatedUserException
	 * @throws FederatedUserNotFoundException
	 * @throws InvalidIdException
	 * @throws SingleCircleNotFoundException
	 * @throws RequestBuilderException
	 */
	public function setLocalCurrentUser(?IUser $user): void {
		if ($user === null) {
			return;
		}

		$this->setLocalCurrentUserId($user->getUID());
	}

	/**
	 * @param string $userId
	 *
	 * @throws FederatedUserException
	 * @throws FederatedUserNotFoundException
	 * @throws InvalidIdException
	 * @throws RequestBuilderException
	 * @throws SingleCircleNotFoundException
	 */
	public function setLocalCurrentUserId(string $userId): void {
		$this->currentUser = $this->getLocalFederatedUser($userId);
	}

	/**
	 * @param string $appId
	 * @param int $appNumber
	 *
	 * @throws FederatedUserException
	 * @throws InvalidIdException
	 * @throws SingleCircleNotFoundException
	 */
	public function setLocalCurrentApp(string $appId, int $appNumber): void {
		$this->currentApp = $this->getAppInitiator($appId, $appNumber);
	}


	/**
	 * set a CurrentUser, based on a IFederatedUser.
	 * CurrentUser is mainly used to manage rights when requesting the database.
	 *
	 * @param IFederatedUser $federatedUser
	 *
	 * @throws FederatedUserException
	 */
	public function setCurrentUser(IFederatedUser $federatedUser): void {
		if (!($federatedUser instanceof FederatedUser)) {
			$tmp = new FederatedUser();
			$tmp->importFromIFederatedUser($federatedUser);
			$federatedUser = $tmp;
		}

		$this->confirmFederatedUser($federatedUser);

		$this->currentUser = $federatedUser;
	}

	/**
	 *
	 */
	public function unsetCurrentUser(): void {
		$this->currentUser = null;
	}

	/**
	 * @return FederatedUser|null
	 */
	public function getCurrentUser(): ?FederatedUser {
		return $this->currentUser;
	}

	/**
	 * @return bool
	 */
	public function hasCurrentUser(): bool {
		return !is_null($this->currentUser);
	}

	/**
	 * @throws InitiatorNotFoundException
	 */
	public function mustHaveCurrentUser(): void {
		if ($this->bypass) {
			return;
		}
		if (!$this->hasCurrentUser() && !$this->hasRemoteInstance()) {
			throw new InitiatorNotFoundException('Invalid initiator');
		}
	}

	/**
	 * @param bool $bypass
	 */
	public function bypassCurrentUserCondition(bool $bypass): void {
		$this->bypass = $bypass;
	}


	/**
	 * @param bool $initiatedByOcc
	 */
	public function setInitiatedByOcc(bool $initiatedByOcc): void {
		$this->initiatedByOcc = $initiatedByOcc;
	}

	/**
	 * @return bool
	 */
	public function isInitiatedByOcc(): bool {
		return $this->initiatedByOcc;
	}

	/**
	 * @param Member $member
	 *
	 * @throws ContactAddressBookNotFoundException
	 * @throws ContactFormatException
	 * @throws ContactNotFoundException
	 * @throws FederatedUserException
	 * @throws InvalidIdException
	 * @throws RequestBuilderException
	 * @throws SingleCircleNotFoundException
	 */
	public function setMemberPatron(Member $member): void {
		if ($this->isInitiatedByOcc()) {
			$member->setInvitedBy($this->getAppInitiator('occ', Member::APP_OCC));
		} else {
			$member->setInvitedBy($this->getCurrentUser());
/** @return stdClass|null */
function mayReturnNull() { }

function doesNotAcceptNull(stdClass $x) { }

// With potential error.
function withoutCheck() {
    $x = mayReturnNull();
    doesNotAcceptNull($x); // Potential error here.
}

// Safe - Alternative 1
function withCheck1() {
    $x = mayReturnNull();
    if ( ! $x instanceof stdClass) {
        throw new \LogicException('$x must be defined.');
    }
    doesNotAcceptNull($x);
}

// Safe - Alternative 2
function withCheck2() {
    $x = mayReturnNull();
    if ($x instanceof stdClass) {
        doesNotAcceptNull($x);
    }
}
		}
	}


	/**
	 * @return FederatedUser|null
	 */
	public function getCurrentApp(): ?FederatedUser {
		return $this->currentApp;
	}

	/**
	 * @return bool
	 */
	public function hasCurrentApp(): bool {
		return !is_null($this->currentApp);
	}


	/**
	 * set a RemoteInstance, mostly from a remote request (RemoteController)
	 * Used to limit rights in some request in the local database.
	 *
	 * @param RemoteInstance $remoteInstance
	 */
	public function setRemoteInstance(RemoteInstance $remoteInstance): void {
		$this->remoteInstance = $remoteInstance;
	}

	/**
	 * @return RemoteInstance|null
	 */
	public function getRemoteInstance(): ?RemoteInstance {
		return $this->remoteInstance;
	}

	/**
	 * @return bool
	 */
	public function hasRemoteInstance(): bool {
		return !is_null($this->remoteInstance);
	}


	/**
	 * Get the full FederatedUser for a local user.
	 * Will generate the SingleId if none exist
	 *
	 * @param string $userId
	 * @param bool $check
	 *
	 * @return FederatedUser
	 * @throws ContactAddressBookNotFoundException
	 * @throws ContactFormatException
	 * @throws ContactNotFoundException
	 * @throws FederatedUserException
	 * @throws FederatedUserNotFoundException
	 * @throws InvalidIdException
	 * @throws RequestBuilderException
	 * @throws SingleCircleNotFoundException
	 */
	public function getLocalFederatedUser(string $userId, bool $check = true): FederatedUser {
		if ($check) {
			$user = $this->userManager->get($userId);
			if ($user === null) {
				throw new FederatedUserNotFoundException('user ' . $userId . ' not found');
			}
			$userId = $user->getUID();
		}

		$federatedUser = new FederatedUser();
		$federatedUser->set($userId);
		$this->fillSingleCircleId($federatedUser, $check);

		return $federatedUser;
	}


	/**
	 * Get the full FederatedUser for a local user.
	 * Will generate the SingleId if none exist
	 *
	 * @param string $appId
	 * @param int $appNumber
	 *
	 * @return FederatedUser
	 * @throws ContactAddressBookNotFoundException
	 * @throws ContactFormatException
	 * @throws ContactNotFoundException
	 * @throws FederatedUserException
	 * @throws InvalidIdException
	 * @throws RequestBuilderException
	 * @throws SingleCircleNotFoundException
	 */
	public function getAppInitiator(string $appId, int $appNumber): FederatedUser {
		$circle = new Circle();
		$circle->setSource($appNumber);

		$federatedUser = new FederatedUser();
		$federatedUser->set($appId, '', Member::TYPE_APP, $circle);

		$this->fillSingleCircleId($federatedUser);

		return $federatedUser;
	}


	/**
	 * some ./occ commands allows to add an Initiator, or force the PoV from the local circles' owner
	 *
	 * TODO: manage non-user type ?
	 *
	 * @param string $userId
	 * @param int $userType
	 * @param string $circleId
	 * @param bool $bypass
	 *
	 * @throws CircleNotFoundException
	 * @throws FederatedItemException
	 * @throws FederatedUserException
	 * @throws FederatedUserNotFoundException
	 * @throws InvalidIdException
	 * @throws MemberNotFoundException
	 * @throws OwnerNotFoundException
	 * @throws RemoteInstanceException
	 * @throws RemoteNotFoundException
	 * @throws RemoteResourceNotFoundException
	 * @throws RequestBuilderException
	 * @throws SingleCircleNotFoundException
	 * @throws UnknownRemoteException
	 * @throws UserTypeNotFoundException
	 */
	public function commandLineInitiator(
		string $userId,
		int $userType = Member::TYPE_SINGLE,
		string $circleId = '',
		bool $bypass = false
	): void {
		if ($userId !== '') {
			$this->setCurrentUser($this->getFederatedUser($userId, $userType));

			return;
		}

		if ($circleId !== '') {
			$localCircle = $this->circleRequest->getCircle($circleId, null, null, 0);
			if ($this->configService->isLocalInstance($localCircle->getInstance())) {
				$this->setCurrentUser($localCircle->getOwner());

				return;
			}
		}

		if (!$bypass) {
			throw new CircleNotFoundException(
				'This Circle is not managed from this instance, please use --initiator'
			);
		}

		$this->bypassCurrentUserCondition($bypass);
	}


	/**
	 * Works like getFederatedUser, but returns a member.
	 * Allow to specify a level: handle@instance,level
	 *
	 * Used for filters when searching for Circles
	 * TODO: Used outside of ./occ circles:manage:list ?
	 *
	 * @param string $userId
	 * @param int $level
	 *
	 * @return Member
	 * @throws CircleNotFoundException
	 * @throws FederatedItemException
	 * @throws FederatedUserException
	 * @throws FederatedUserNotFoundException
	 * @throws InvalidIdException
	 * @throws MemberNotFoundException
	 * @throws OwnerNotFoundException
	 * @throws RemoteInstanceException
	 * @throws RemoteNotFoundException
	 * @throws RemoteResourceNotFoundException
	 * @throws SingleCircleNotFoundException
	 * @throws UnknownRemoteException
	 * @throws UserTypeNotFoundException
	 */
	public function getFederatedMember(string $userId, int $level = Member::LEVEL_MEMBER): Member {
		$userId = trim($userId, ',');
		if (strpos($userId, ',') !== false) {
			list($userId, $level) = explode(',', $userId);
		}

		$federatedUser = $this->getFederatedUser($userId, Member::TYPE_USER);
		$member = new Member();
		$member->importFromIFederatedUser($federatedUser);
		$member->setLevel((int)$level);

		return $member;
	}


	/**
	 * get a valid FederatedUser, based on the federatedId (userId@instance) its the type.
	 * If instance is local, get the local valid FederatedUser
	 * If instance is not local, get the remote valid FederatedUser
	 *
	 * @param string $federatedId
	 * @param int $type
	 *
	 * @return FederatedUser
	 * @throws CircleNotFoundException
	 * @throws FederatedItemException
	 * @throws FederatedUserException
	 * @throws FederatedUserNotFoundException
	 * @throws InvalidIdException
	 * @throws MemberNotFoundException
	 * @throws OwnerNotFoundException
	 * @throws RemoteInstanceException
	 * @throws RemoteNotFoundException
	 * @throws RemoteResourceNotFoundException
	 * @throws SingleCircleNotFoundException
	 * @throws UnknownRemoteException
	 * @throws UserTypeNotFoundException
	 * @throws RequestBuilderException
	 */
	public function getFederatedUser(string $federatedId, int $type = Member::TYPE_SINGLE): FederatedUser {
		if ($type === Member::TYPE_USER) {
			try {
				return $this->getLocalFederatedUser($federatedId);
			} catch (Exception $e) {

			}
		}

		list($singleId, $instance) = $this->extractIdAndInstance($federatedId);
		switch ($type) {
			case Member::TYPE_SINGLE:
			case Member::TYPE_CIRCLE:
				return $this->getFederatedUser_SingleId($singleId, $instance);
			case Member::TYPE_USER:
				return $this->getFederatedUser_User($singleId, $instance);
			case Member::TYPE_GROUP:
				return $this->getFederatedUser_Group($singleId, $instance);
			case Member::TYPE_MAIL:
				return $this->getFederatedUser_Mail($federatedId);
			case Member::TYPE_CONTACT:
				return $this->getFederatedUser_Contact($federatedId);
		}

		throw new UserTypeNotFoundException();
	}


	/**
	 * Generate a FederatedUser based on local data.
	 * WARNING: There is no confirmation that the returned FederatedUser exists or is valid at this point.
	 * Use getFederatedUser() instead if a valid and confirmed FederatedUser is needed.
	 *
	 * if $federatedId is a known SingleId, will returns data from the local database.
	 * if $federatedId is a local username, will returns data from the local database.
	 * Otherwise, the FederatedUser will not contains a SingleId.
	 *
	 * @param string $federatedId
	 * @param int $type
	 *
	 * @return FederatedUser
	 */
	public function generateFederatedUser(string $federatedId, int $type = 0): FederatedUser {
		try {
			return $this->getFederatedUser($federatedId, $type);
		} catch (Exception $e) {

		}

		list($userId, $instance) = $this->extractIdAndInstance($federatedId);
		$federatedUser = new FederatedUser();
		$federatedUser->set($userId, $instance, $type);

		return $federatedUser;
	}


	/**
	 * @param FederatedUser $federatedUser
	 */
	public function deleteFederatedUser(FederatedUser $federatedUser): void {
		$this->memberRequest->deleteFederatedUser($federatedUser);
		$this->membershipService->deleteFederatedUser($federatedUser);
	}


	/**
	 * @param string $singleId
	 * @param string $instance
	 *
	 * @return FederatedUser
	 * @throws CircleNotFoundException
	 * @throws FederatedItemException
	 * @throws FederatedUserException
	 * @throws FederatedUserNotFoundException
	 * @throws MemberNotFoundException
	 * @throws OwnerNotFoundException
	 * @throws RemoteInstanceException
	 * @throws RemoteNotFoundException
	 * @throws RemoteResourceNotFoundException
	 * @throws UnknownRemoteException
	 */
	public function getFederatedUser_SingleId(string $singleId, string $instance): FederatedUser {
		if (strlen($singleId) !== ManagedModel::ID_LENGTH) {
			throw new MemberNotFoundException();
		}

		if ($this->configService->isLocalInstance($instance)) {
			return $this->circleRequest->getFederatedUserBySingleId($singleId);
		} else {
			$federatedUser =
				$this->remoteService->getFederatedUserFromInstance($singleId, $instance, Member::TYPE_SINGLE);
			$this->confirmLocalSingleId($federatedUser);

			return $federatedUser;
		}
	}


	/**
	 * @param string $userId
	 * @param string $instance
	 *
	 * @return FederatedUser
	 * @throws FederatedUserException
	 * @throws FederatedUserNotFoundException
	 * @throws InvalidIdException
	 * @throws RemoteInstanceException
	 * @throws RemoteNotFoundException
	 * @throws RemoteResourceNotFoundException
	 * @throws SingleCircleNotFoundException
	 * @throws UnknownRemoteException
	 * @throws FederatedItemException
	 */
	private function getFederatedUser_User(string $userId, string $instance): FederatedUser {
		if ($this->configService->isLocalInstance($instance)) {
			return $this->getLocalFederatedUser($userId);
		} else {
			$federatedUser =
				$this->remoteService->getFederatedUserFromInstance($userId, $instance, Member::TYPE_USER);
			$this->confirmLocalSingleId($federatedUser);

			return $federatedUser;
		}
	}


	/**
	 * @param string $groupName
	 * @param string $instance
	 *
	 * @return FederatedUser
	 * @throws FederatedEventException
	 * @throws FederatedItemException
	 * @throws FederatedUserException
	 * @throws GroupNotFoundException
	 * @throws InitiatorNotConfirmedException
	 * @throws InvalidIdException
	 * @throws OwnerNotFoundException
	 * @throws RemoteInstanceException
	 * @throws RemoteNotFoundException
	 * @throws RemoteResourceNotFoundException
	 * @throws SingleCircleNotFoundException
	 * @throws UnknownRemoteException
	 */
	public function getFederatedUser_Group(string $groupName, string $instance): FederatedUser {
		if ($this->configService->isLocalInstance($instance)) {
			$circle = $this->getGroupCircle($groupName);
			$federatedGroup = new FederatedUser();

			return $federatedGroup->importFromCircle($circle);
		} else {
			// TODO: implement remote groups
		}
	}


	/**
	 * @param string $mailAddress
	 *
	 * @return FederatedUser
	 * @throws FederatedUserException
	 * @throws InvalidIdException
	 * @throws RequestBuilderException
	 * @throws SingleCircleNotFoundException
	 */
	public function getFederatedUser_Mail(string $mailAddress): FederatedUser {
		$federatedUser = new FederatedUser();
		$federatedUser->set($mailAddress, '', Member::TYPE_MAIL);
		$this->fillSingleCircleId($federatedUser);

		return $federatedUser;
	}


	/**
	 * @param string $contactPath
	 *
	 * @return FederatedUser
	 * @throws FederatedUserException
	 * @throws InvalidIdException
	 * @throws RequestBuilderException
	 * @throws SingleCircleNotFoundException
	 */
	public function getFederatedUser_Contact(string $contactPath): FederatedUser {
		$federatedUser = new FederatedUser();
		$federatedUser->setUserId($contactPath);
		$federatedUser->setInstance('');
		$federatedUser->setUserType(Member::TYPE_CONTACT);

		$this->fillSingleCircleId($federatedUser);

		return $federatedUser;
	}


	/**
	 * extract userID and instance from a federatedId
	 *
	 * @param string $federatedId
	 *
	 * @return array
	 */
	public function extractIdAndInstance(string $federatedId): array {
		$federatedId = trim($federatedId, '@');
		if (strrpos($federatedId, '@') === false) {
			$userId = $federatedId;
			$instance = $this->interfaceService->getLocalInstance();
		} else {
			list($userId, $instance) = explode('@', $federatedId);
		}

		return [$userId, $instance];
	}


	/**
	 * @param FederatedUser $federatedUser
	 * @param bool $generate
	 *
	 * @throws ContactAddressBookNotFoundException
	 * @throws ContactFormatException
	 * @throws ContactNotFoundException
	 * @throws FederatedUserException
	 * @throws InvalidIdException
	 * @throws RequestBuilderException
	 * @throws SingleCircleNotFoundException
	 */
	private function fillSingleCircleId(FederatedUser $federatedUser, bool $generate = true): void {
		if ($federatedUser->getSingleId() !== '') {
			return;
		}

		$circle = $this->getSingleCircle($federatedUser, $generate);
		$federatedUser->setSingleId($circle->getSingleId());
		$federatedUser->setBasedOn($circle);
	}


	/**
	 * get the Single Circle from a local user
	 *
	 * @param FederatedUser $federatedUser
	 * @param bool $generate
	 *
	 * @return Circle
	 * @throws ContactAddressBookNotFoundException
	 * @throws ContactFormatException
	 * @throws ContactNotFoundException
	 * @throws FederatedUserException
	 * @throws InvalidIdException
	 * @throws RequestBuilderException
	 * @throws SingleCircleNotFoundException
	 */
	private function getSingleCircle(FederatedUser $federatedUser, bool $generate = true): Circle {
		if (!$this->configService->isLocalInstance($federatedUser->getInstance())) {
			throw new FederatedUserException('FederatedUser must be local');
		}

		try {
			return $this->circleRequest->getSingleCircle($federatedUser);
		} catch (SingleCircleNotFoundException $e) {
			if (!$generate) {
				throw new SingleCircleNotFoundException();
			}

			$circle = new Circle();
			$id = $this->token(ManagedModel::ID_LENGTH);

			if ($federatedUser->hasBasedOn()) {
				$source = $federatedUser->getBasedOn()->getSource();
			} else {
				$source = $federatedUser->getUserType();
			}

			$prefix = ($federatedUser->getUserType() === Member::TYPE_APP) ? 'app'
				: Member::$TYPE[$federatedUser->getUserType()];

			$circle->setName($prefix . ':' . $federatedUser->getUserId() . ':' . $id)
				   ->setDisplayName($this->getLocalDisplayName($federatedUser))
				   ->setSingleId($id)
				   ->setSource($source);

			if ($federatedUser->getUserType() === Member::TYPE_APP) {
				$circle->setConfig(Circle::CFG_SINGLE | Circle::CFG_ROOT);
			} else {
				$circle->setConfig(Circle::CFG_SINGLE);
			}
			$this->circleRequest->save($circle);

			$owner = new Member();
			$owner->importFromIFederatedUser($federatedUser);
			$owner->setLevel(Member::LEVEL_OWNER)
				  ->setCircleId($id)
				  ->setSingleId($id)
				  ->setId($id)
				  ->setDisplayName($owner->getUserId())
				  ->setStatus('Member');

			if ($federatedUser->getUserType() !== Member::TYPE_APP) {
				$owner->setInvitedBy($this->getAppInitiator(Application::APP_ID, Member::APP_CIRCLES));
			}

			$this->memberRequest->save($owner);
			// TODO: should not be needed
			// $this->membershipService->onUpdate($id);
		}

		return $this->circleRequest->getSingleCircle($federatedUser);
	}


	/**
	 * @param FederatedUser $federatedUser
	 *
	 * @return string
	 * @throws ContactAddressBookNotFoundException
	 * @throws ContactFormatException
	 * @throws ContactNotFoundException
	 */
	private function getLocalDisplayName(FederatedUser $federatedUser): string {
		if ($federatedUser->getUserType() === Member::TYPE_CONTACT) {
			return $this->contactService->getDisplayName($federatedUser->getUserId());
		}

		return $federatedUser->getUserId();
	}


	/**
	 * Confirm that all field of a FederatedUser are filled.
	 *
	 * @param FederatedUser $federatedUser
	 *
	 * @throws FederatedUserException
	 */
	private function confirmFederatedUser(FederatedUser $federatedUser): void {
		if ($federatedUser->getUserId() === ''
			|| $federatedUser->getSingleId() === ''
			|| $federatedUser->getUserType() === 0
			|| $federatedUser->getInstance() === '') {
			$this->debug('FederatedUser is not empty', ['federatedUser' => $federatedUser]);
			throw new FederatedUserException('FederatedUser is not complete');
		}
	}

	/**
	 * Confirm that the singleId of a FederatedUser is unique and not used to any other member of the
	 * database.
	 *
	 * @param FederatedUser $federatedUser
	 *
	 * @throws FederatedUserException
	 * @throws RequestBuilderException
	 */
	public function confirmLocalSingleId(IFederatedUser $federatedUser): void {
		$members = $this->memberRequest->getMembersBySingleId($federatedUser->getSingleId());

		foreach ($members as $member) {
			if (!$federatedUser->compareWith($member)) {
				$this->debug(
					'uniqueness of SingleId could not be confirmed',
					['federatedUser' => $federatedUser, 'localMember' => $member]
				);
				throw new FederatedUserException('uniqueness of SingleId could not be confirmed');
			}
		}
	}


	/**
	 * @param IFederatedUser $federatedUser
	 *
	 * @throws FederatedUserException
	 * @throws RequestBuilderException
	 */
	public function confirmSingleIdUniqueness(IFederatedUser $federatedUser): void {
		if (empty($this->memberRequest->getAlternateSingleId($federatedUser))) {
			return;
		}

		throw new FederatedUserException('uniqueness of SingleId could not be confirmed');
	}


	/**
	 * @param string $groupId
	 *
	 * @return Circle
	 * @throws GroupNotFoundException
	 * @throws FederatedEventException
	 * @throws FederatedItemException
	 * @throws FederatedUserException
	 * @throws InitiatorNotConfirmedException
	 * @throws InvalidIdException
	 * @throws OwnerNotFoundException
	 * @throws RemoteInstanceException
	 * @throws RemoteNotFoundException
	 * @throws RemoteResourceNotFoundException
	 * @throws SingleCircleNotFoundException
	 * @throws UnknownRemoteException
	 * @throws RequestBuilderException
	 */
	public function getGroupCircle(string $groupId): Circle {
		$group = $this->groupManager->get($groupId);
		if ($group === null) {
			throw new GroupNotFoundException('group not found');
		}

		$this->setLocalCurrentApp(Application::APP_ID, Member::APP_CIRCLES);
		$owner = $this->getCurrentApp();

		$circle = new Circle();
		$circle->setName('group:' . $groupId)
			   ->setConfig(Circle::CFG_SYSTEM | Circle::CFG_NO_OWNER | Circle::CFG_HIDDEN)
			   ->setSingleId($this->token(ManagedModel::ID_LENGTH))
			   ->setSource(Member::TYPE_GROUP);

		$member = new Member();
		$member->importFromIFederatedUser($owner);
/** @return stdClass|null */
function mayReturnNull() { }

function doesNotAcceptNull(stdClass $x) { }

// With potential error.
function withoutCheck() {
    $x = mayReturnNull();
    doesNotAcceptNull($x); // Potential error here.
}

// Safe - Alternative 1
function withCheck1() {
    $x = mayReturnNull();
    if ( ! $x instanceof stdClass) {
        throw new \LogicException('$x must be defined.');
    }
    doesNotAcceptNull($x);
}

// Safe - Alternative 2
function withCheck2() {
    $x = mayReturnNull();
    if ($x instanceof stdClass) {
        doesNotAcceptNull($x);
    }
}
		$member->setId($this->token(ManagedModel::ID_LENGTH))
			   ->setCircleId($circle->getSingleId())
			   ->setLevel(Member::LEVEL_OWNER)
			   ->setStatus(Member::STATUS_MEMBER);
		$circle->setOwner($member)
			   ->setInitiator($member);

		try {
			return $this->circleRequest->searchCircle($circle, $owner);
		} catch (CircleNotFoundException $e) {

		}

		$circle->setDisplayName($groupId);

		$event = new FederatedEvent(CircleCreate::class);
		$event->setCircle($circle);
		$this->federatedEventService->newEvent($event);

		return $circle;
	}

}


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FederatedUserService::deleteFederatedUser() A

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