/**
* Redirects the user to Google's AuthSub login page so that they can login to access restricted functions.
* The URL in the $next parameter must be registered with Google. At the URL specified there, the "token" value must be pulled from
* the request and passed to {@see Picasa::authorizeWithAuthSub()} for the authorization to be complete.
*
* @access public
* @static
* @param string $next The URL that the user should be redirected to after visiting the login page. This URL must be
* registered with Google in advance. See
* {@link http://code.google.com/apis/accounts/docs/RegistrationForWebAppsAuto.html}.
* @param int $session Must be either 1 or 0. This indicates if the login should be transferable to a session
* token, which is valid for a long time, wherease the default token is only useable once.
* 1 to enable session tokens, 0 to disable.
* @return void
*/
public static function redirectToLoginPage($next, $session = 1)
{
$url = Picasa::getUrlToLoginPage($next, $session);
header("Location: {$url}");
}
