laravel/laravel/auth.php

<?php namespace Laravel;

class Auth {

	/**
	 * The current user of the application.
	 *
	 * @var object
	 */
	protected static $user;

	/**
	 * The key used when storing the user ID in the session.
	 *
	 * @var string
	 */
	const user_key = 'laravel_user_id';

	/**
	 * The key used when setting the "remember me" cookie.
	 *
	 * @var string
	 */
	const remember_key = 'laravel_remember';

	/**
	 * Determine if the user of the application is not logged in.
	 *
	 * This method is the inverse of the "check" method.
	 *
	 * @return bool
	 */
	public static function guest()
	{
		return ! static::check();
	}

	/**
	 * Determine if the user of the application is logged in.
	 *
	 * @return bool
	 */
	public static function check()
	{
		return ! is_null(static::user());
	}

	/**
	 * Get the current user of the application.
	 *
	 * This method will call the "user" closure in the auth configuration file.
	 * If the user is not authenticated, null will be returned by the methd.
	 *
	 * If no user exists in the session, the method will check for a "remember me"
	 * cookie and attempt to login the user based on the value of that cookie.
	 *
	 * <code>
	 *		// Get the current user of the application
	 *		$user = Auth::user();
	 *
	 *		// Access a property on the current user of the application
	 *		$email = Auth::user()->email;
	 * </code>
	 *
	 * @return object
	 */
	public static function user()
	{
		if ( ! is_null(static::$user)) return static::$user;

		$id = IoC::core('session')->get(Auth::user_key);

		static::$user = call_user_func(Config::get('auth.user'), $id);

		// If the user was not found in the database, but a "remember me" cookie
		// exists, we will attempt to recall the user based on the cookie value.
		// Since all cookies contain a fingerprint hash verifying that the have
		// not been modified on the client, we should be able to trust it.
		$recaller = Cookie::get(Auth::remember_key);

		if (is_null(static::$user) and ! is_null($recaller))
		{
			static::$user = static::recall($recaller);
		}

		return static::$user;
	}

	/**
	 * Attempt to login a user based on a long-lived "remember me" cookie.
	 *
	 * @param  string  $recaller
	 * @return mixed
	 */
	protected static function recall($recaller)
	{
		// When the "remember me" cookie is stored, it is encrypted and contains the
		// user's ID and a long, random string. The ID and string are separated by
		// a pipe character. Since we exploded the decrypted string, we can just
		// pass the first item in the array to the user Closure.
		$recaller = explode('|', Crypter::decrypt($recaller));

		if ( ! is_null($user = call_user_func(Config::get('auth.user'), $recaller[0])))
		{
			static::login($user);

			return $user;
		}
	}

	/**
	 * Attempt to log a user into the application.
	 *
	 * If the credentials are valid, the user will be logged into the application
	 * and their user ID will be stored in the session via the "login" method.
	 *
	 * The user may also be "remembered", which will keep the user logged into the
	 * application for one year or until they logout. The user is remembered via
	 * an encrypted cookie.
	 *
	 * @param  string  $username
	 * @param  string  $password
	 * @param  bool    $remember
	 * @return bool
	 */
	public static function attempt($username, $password = null, $remember = false)
	{
		$config = Config::get('auth');

		$user = call_user_func($config['attempt'], $username, $password, $config);

		if ( ! is_null($user))
		{
			static::login($user, $remember);

			return true;
		}

		return false;
	}

	/**
	 * Log a user into the application.
	 *
	 * An object representing the user or an integer user ID may be given to the method.
	 * If an object is given, the object must have an "id" property containing the user
	 * ID as it is stored in the database.
	 *
	 * <code>
	 *		// Login a user by passing a user object
	 *		Auth::login($user);
	 *
	 *		// Login the user with an ID of 15
	 *		Auth::login(15);
	 *
	 *		// Login a user and set a "remember me" cookie
	 *		Auth::login($user, true);
	 * </code>
	 *
	 * @param  object|int  $user
	 * @param  bool        $remember
	 * @return void
	 */
	public static function login($user, $remember = false)
	{
		$id = (is_object($user)) ? $user->id : (int) $user;

		if ($remember) static::remember($id);

		IoC::core('session')->put(Auth::user_key, $id);
	}

	/**
	 * Set a cookie so that users are "remembered" and don't need to login.
	 *
	 * @param  string  $id
	 * @return void
	 */
	protected static function remember($id)
	{
		$recaller = Crypter::encrypt($id.'|'.Str::random(40));

		// This method assumes the "remember me" cookie should have the same
		// configuration as the session cookie. Since this cookie, like the
		// session cookie, should be kept very secure, it's probably safe
		// to assume the settings are the same.
		$config = Config::get('session');

		extract($config, EXTR_SKIP);

		Cookie::forever(Auth::remember_key, $recaller, $path, $domain, $secure);
	}

	/**
	 * Log the current user out of the application.
	 *
	 * The "logout" closure in the authenciation configuration file will be
	 * called. All authentication cookies will be deleted and the user ID
	 * will be removed from the session.
	 *
	 * @return void
	 */
	public static function logout()
	{
		call_user_func(Config::get('auth.logout'), static::user());

		static::$user = null;

		Cookie::forget(Auth::user_key);

		Cookie::forget(Auth::remember_key);

		IoC::core('session')->forget(Auth::user_key);
	}

}