<commit_before><?php
/**
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 *
 * @copyright Copyright (c) 2016, ownCloud GmbH.
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * 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, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

namespace OC\User;

use OC\Hooks\PublicEmitter;
use OCP\IUser;
use OCP\IUserBackend;
use OCP\IUserManager;
use OCP\IConfig;

/**
 * Class Manager
 *
 * Hooks available in scope \OC\User:
 * - preSetPassword(\OC\User\User $user, string $password, string $recoverPassword)
 * - postSetPassword(\OC\User\User $user, string $password, string $recoverPassword)
 * - preDelete(\OC\User\User $user)
 * - postDelete(\OC\User\User $user)
 * - preCreateUser(string $uid, string $password)
 * - postCreateUser(\OC\User\User $user, string $password)
 * - change(\OC\User\User $user)
 *
 * @package OC\User
 */
class Manager extends PublicEmitter implements IUserManager {
	/**
	 * @var \OCP\UserInterface[] $backends
	 */
	private $backends = [];

	/**
	 * @var \OC\User\User[] $cachedUsers
	 */
	private $cachedUsers = [];

	/**
	 * @var \OCP\IConfig $config
	 */
	private $config;

	/**
	 * @param \OCP\IConfig $config
	 */
	public function __construct(IConfig $config = null) {
		$this->config = $config;
		$cachedUsers = &$this->cachedUsers;
		$this->listen('\OC\User', 'postDelete', function ($user) use (&$cachedUsers) {
			/** @var \OC\User\User $user */
			unset($cachedUsers[$user->getUID()]);
		});
	}

	/**
	 * Get the active backends
	 * @return \OCP\UserInterface[]
	 */
	public function getBackends() {
		return $this->backends;
	}

	/**
	 * register a user backend
	 *
	 * @param \OCP\UserInterface $backend
	 */
	public function registerBackend($backend) {
		$this->backends[] = $backend;
	}

	/**
	 * remove a user backend
	 *
	 * @param \OCP\UserInterface $backend
	 */
	public function removeBackend($backend) {
		$this->cachedUsers = [];
		if (($i = array_search($backend, $this->backends)) !== false) {
			unset($this->backends[$i]);
		}
	}

	/**
	 * remove all user backends
	 */
	public function clearBackends() {
		$this->cachedUsers = [];
		$this->backends = [];
	}

	/**
	 * get a user by user id
	 *
	 * @param string $uid
	 * @return \OC\User\User|null Either the user or null if the specified user does not exist
	 */
	public function get($uid) {
		if (isset($this->cachedUsers[$uid])) { //check the cache first to prevent having to loop over the backends
			return $this->cachedUsers[$uid];
		}
		foreach ($this->backends as $backend) {
			if ($backend->userExists($uid)) {
				return $this->getUserObject($uid, $backend);
			}
		}
		return null;
	}

	/**
	 * get or construct the user object
	 *
	 * @param string $uid
	 * @param \OCP\UserInterface $backend
	 * @param bool $cacheUser If false the newly created user object will not be cached
	 * @return \OC\User\User
	 */
	protected function getUserObject($uid, $backend, $cacheUser = true) {
		if (isset($this->cachedUsers[$uid])) {
			return $this->cachedUsers[$uid];
		}

		if (method_exists($backend, 'loginName2UserName')) {
			$loginName = $backend->loginName2UserName($uid);
			if ($loginName !== false) {
				$uid = $loginName;
			}
			if (isset($this->cachedUsers[$uid])) {
				return $this->cachedUsers[$uid];
			}
		}

		$user = new User($uid, $backend, $this, $this->config);
		if ($cacheUser) {
			$this->cachedUsers[$uid] = $user;
		}
		return $user;
	}

	/**
	 * check if a user exists
	 *
	 * @param string $uid
	 * @return bool
	 */
	public function userExists($uid) {
		$user = $this->get($uid);
		return ($user !== null);
	}

	/**
	 * Check if the password is valid for the user
	 *
	 * @param string $loginName
	 * @param string $password
	 * @return mixed the User object on success, false otherwise<commit_msg>Pass EventDispatcher<commit_after><?php
/**
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 * @author <NAME> <<EMAIL>>
 *
 * @copyright Copyright (c) 2016, ownCloud GmbH.
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * 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, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

namespace OC\User;

use OC\Hooks\PublicEmitter;
use OCP\IUser;
use OCP\IUserBackend;
use OCP\IUserManager;
use OCP\IConfig;

/**
 * Class Manager
 *
 * Hooks available in scope \OC\User:
 * - preSetPassword(\OC\User\User $user, string $password, string $recoverPassword)
 * - postSetPassword(\OC\User\User $user, string $password, string $recoverPassword)
 * - preDelete(\OC\User\User $user)
 * - postDelete(\OC\User\User $user)
 * - preCreateUser(string $uid, string $password)
 * - postCreateUser(\OC\User\User $user, string $password)
 * - change(\OC\User\User $user)
 *
 * @package OC\User
 */
class Manager extends PublicEmitter implements IUserManager {
	/**
	 * @var \OCP\UserInterface[] $backends
	 */
	private $backends = [];

	/**
	 * @var \OC\User\User[] $cachedUsers
	 */
	private $cachedUsers = [];

	/**
	 * @var \OCP\IConfig $config
	 */
	private $config;

	/**
	 * @param \OCP\IConfig $config
	 */
	public function __construct(IConfig $config = null) {
		$this->config = $config;
		$cachedUsers = &$this->cachedUsers;
		$this->listen('\OC\User', 'postDelete', function ($user) use (&$cachedUsers) {
			/** @var \OC\User\User $user */
			unset($cachedUsers[$user->getUID()]);
		});
	}

	/**
	 * Get the active backends
	 * @return \OCP\UserInterface[]
	 */
	public function getBackends() {
		return $this->backends;
	}

	/**
	 * register a user backend
	 *
	 * @param \OCP\UserInterface $backend
	 */
	public function registerBackend($backend) {
		$this->backends[] = $backend;
	}

	/**
	 * remove a user backend
	 *
	 * @param \OCP\UserInterface $backend
	 */
	public function removeBackend($backend) {
		$this->cachedUsers = [];
		if (($i = array_search($backend, $this->backends)) !== false) {
			unset($this->backends[$i]);
		}
	}

	/**
	 * remove all user backends
	 */
	public function clearBackends() {
		$this->cachedUsers = [];
		$this->backends = [];
	}

	/**
	 * get a user by user id
	 *
	 * @param string $uid
	 * @return \OC\User\User|null Either the user or null if the specified user does not exist
	 */
	public function get($uid) {
		if (isset($this->cachedUsers[$uid])) { //check the cache first to prevent having to loop over the backends
			return $this->cachedUsers[$uid];
		}
		foreach ($this->backends as $backend) {
			if ($backend->userExists($uid)) {
				return $this->getUserObject($uid, $backend);
			}
		}
		return null;
	}

	/**
	 * get or construct the user object
	 *
	 * @param string $uid
	 * @param \OCP\UserInterface $backend
	 * @param bool $cacheUser If false the newly created user object will not be cached
	 * @return \OC\User\User
	 */
	protected function getUserObject($uid, $backend, $cacheUser = true) {
		if (isset($this->cachedUsers[$uid])) {
			return $this->cachedUsers[$uid];
		}

		if (method_exists($backend, 'loginName2UserName')) {
			$loginName = $backend->loginName2UserName($uid);
			if ($loginName !== false) {
				$uid = $loginName;
			}
			if (isset($this->cachedUsers[$uid])) {
				return $this->cachedUsers[$uid];
			}
		}

		$user = new User($uid, $backend, $this, $this->config, null, \OC::$server->getEventDispatcher() );
		if ($cacheUser) {
			$this->cachedUsers[$uid] = $user;
		}
		return $user;
	}

	/**
	 * check if a user exists
	 *
	 * @param string $uid
	 * @return bool
	 */
	public function userExists($uid) {
		$user = $this->get($uid);
		return ($user !== null);
	}

	/**
	 * Check if the password is valid for the user
	 *
	 * @param string $loginName
	 * @param string $password
	 * @return mixed the User object on success, false otherwise
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