<?php
/**
 * A special guest login class for Ship-Simu
 *
 * @author		Roland Haeder <webmaster@shipsimu.org>
 * @version		0.0.0
 * @copyright	Copyright (c) 2007, 2008 Roland Haeder, 2009 Ship-Simu Developer Team
 * @license		GNU GPL 3.0 or any newer version
 * @link		http://www.shipsimu.org
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
class ShipSimuGuestLogin extends BaseFrameworkSystem implements LoginableUser {
	/**
	 * The hashed password
	 */
	private $hashedPassword = '';

	/**
	 * Protected constructor
	 *
	 * @return	void
	 */
	protected function __construct () {
		// Call parent constructor
		parent::__construct(__CLASS__);
	}

	/**
	 * Creates an instance of this login class
	 *
	 * @return	$loginInstance	An instance of this login class
	 */
	public static final function createShipSimuGuestLogin () {
		// Get a new instance
		$loginInstance = new ShipSimuGuestLogin();

		// Return the instance
		return $loginInstance;
	}

	/**
	 * Logins the user with the given request containing the credential. The
	 * result of the login can be thrown by exception or, if prefered stored
	 * in a boolean attribute which is then readable by a matching getter.
	 *
	 * @param	$requestInstance	An instance of a Requestable class
	 * @param	$responseInstance	An instance of a Responseable class
	 * @return	void
	 * @throws	UserAuthMethodException	If wether username nor email login
	 *										was detected
	 * @throws	MissingMethodException		If a method was not found in the
	 *										User class
	 * @throws	UserPasswordMismatchException	If the supplied password did not
	 *										match with the stored password
	 */
	public function doLogin (Requestable $requestInstance, Responseable $responseInstance) {
		// By default no method is selected
		$method = null;
		$data = "";

		// Detect login method (username or email) and try to get a userinstance
		if (!is_null($requestInstance->getRequestElement('user'))) {
			// Username found!
			$method = 'createGuestByUsername';
			$data = $requestInstance->getRequestElement('user');
		} // END - if

		// Is a method detected?
		if (is_null($method)) {
			// Then abort here
			throw new UserAuthMethodException($this, self::EXCEPTION_MISSING_METHOD);
		} elseif (!method_exists($this->getConfigInstance()->getConfigEntry('guest_class'), $method)) {
			// The method is invalid!
			throw new MissingMethodException(array($this, $method), self::EXCEPTION_MISSING_METHOD);
		}

		// Get a user instance
		$userInstance = call_user_func_array(array($this->getConfigInstance()->getConfigEntry('guest_class'), $method), array($data));

		// Remember this new instance in registry
		Registry::getRegistry()->addInstance('user', $userInstance);

		// Is the password correct?
		if ($userInstance->ifPasswordHashMatches($requestInstance) === false) {
			// Mismatching password
			throw new UserPasswordMismatchException(array($this, $userInstance), BaseUser::EXCEPTION_USER_PASS_MISMATCH);
		} // END - if

		// Now do the real login. This can be cookie- or session-based login
		// which depends on the admins setting then on the user's taste.
		// 1) Get a login helper instance
		$helperInstance = ObjectFactory::createObjectByConfiguredName('login_helper_class', array($requestInstance));

		// 2) Execute the login. This will now login...
		$helperInstance->executeLogin($responseInstance);
	}

	/**
	 * Determines wether the login was fine. This is done by checking if 'login' instance is in registry
	 *
	 * @return	$loginDone	Wether the login was fine or not
	 */
	public function ifLoginWasSuccessfull () {
		// Is the registry key there?
		$loginDone = (Registry::getRegistry()->getInstance('login') instanceof Registerable);

		// Return the result
		return $loginDone;
	}

	/**
	 * Encrypt given request key or throw an exception if key was not found in
	 * request
	 *
	 * @param	$requestKey		Key in request class
	 * @return	void
	 */
	public function encryptPassword ($requestKey) {
		// Check if password is found in request
		if ($this->getRequestInstance()->isRequestElementSet($requestKey)) {
			// So encrypt the password and store it for later usage in
			// the request:

			// Get the plain password
			$plainPassword = $this->getRequestInstance()->getRequestElement($requestKey);

			// Get user instance
			$userInstance = Registry::getRegistry()->getInstance('user');

			// Get a crypto helper and hash the password
			$this->hashedPassword = ObjectFactory::createObjectByConfiguredName('crypto_class')->hashString($plainPassword, $userInstance->getPasswordHash());

			// Store the hash back in request
			$this->getRequestInstance()->setRequestElement('pass_hash', $this->hashedPassword);
		} // END - if
	}
}

// [EOF]
?>