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<?php
/**
* Abstract base class for an authentication method
*
* This class is used as a base class for the different authentication
* methods like {@link MemberAuthenticator} or {@link OpenIDAuthenticator}.
*
* @author Markus Lanthaler <markus@silverstripe.com>
* @package sapphire
* @subpackage security
*/
abstract class Authenticator extends Object {
/**
* This variable holds all authenticators that should be used
*
* @var array
*/
private static $authenticators = array('MemberAuthenticator');
/**
* Used to influence the order of authenticators on the login-screen
* (default shows first).
*
* @var string
*/
private static $default_authenticator = 'MemberAuthenticator';
/**
* Method to authenticate an user
*
* @param array $RAW_data Raw data to authenticate the user
* @param Form $form Optional: If passed, better error messages can be
* produced by using
* {@link Form::sessionMessage()}
* @return bool|Member Returns FALSE if authentication fails, otherwise
* the member object
*/
public static function authenticate($RAW_data, Form $form = null) {
}
/**
* Method that creates the login form for this authentication method
*
* @param Controller The parent controller, necessary to create the
* appropriate form action tag
* @return Form Returns the login form to use with this authentication
* method
*/
public static function get_login_form(Controller $controller) {
}
/**
* Get the name of the authentication method
*
* @return string Returns the name of the authentication method.
*/
public static function get_name() {
}
public static function register($authenticator) {
self::register_authenticator($authenticator);
}
/**
* Register a new authenticator
*
* The new authenticator has to exist and to be derived from the
* {@link Authenticator}.
* Every authenticator can be registered only once.
*
* @param string $authenticator Name of the authenticator class to
* register
* @return bool Returns TRUE on success, FALSE otherwise.
*/
public static function register_authenticator($authenticator) {
$authenticator = trim($authenticator);
if(class_exists($authenticator) == false)
return false;
if(is_subclass_of($authenticator, 'Authenticator') == false)
return false;
if(in_array($authenticator, self::$authenticators) == false) {
if(call_user_func(array($authenticator, 'on_register')) === true) {
array_push(self::$authenticators, $authenticator);
} else {
return false;
}
}
return true;
}
public static function unregister($authenticator) {
self::unregister_authenticator($authenticator);
}
/**
* Remove a previously registered authenticator
*
* @param string $authenticator Name of the authenticator class to register
* @return bool Returns TRUE on success, FALSE otherwise.
*/
public static function unregister_authenticator($authenticator) {
if(call_user_func(array($authenticator, 'on_unregister')) === true) {
if(in_array($authenticator, self::$authenticators)) {
unset(self::$authenticators[array_search($authenticator, self::$authenticators)]);
}
};
}
/**
* Check if a given authenticator is registered
*
* @param string $authenticator Name of the authenticator class to check
* @return bool Returns TRUE if the authenticator is registered, FALSE
* otherwise.
*/
public static function is_registered($authenticator) {
return in_array($authenticator, self::$authenticators);
}
/**
* Get all registered authenticators
*
* @return array Returns an array with the class names of all registered
* authenticators.
*/
public static function get_authenticators() {
// put default authenticator first (mainly for tab-order on loginform)
if($key = array_search(self::$default_authenticator,self::$authenticators)) {
unset(self::$authenticators[$key]);
array_unshift(self::$authenticators, self::$default_authenticator);
}
return self::$authenticators;
}
/**
* Set a default authenticator (shows first in tabs)
*
* @param string
*/
public static function set_default_authenticator($authenticator) {
self::$default_authenticator = $authenticator;
}
/**
* @return string
*/
public static function get_default_authenticator() {
return self::$default_authenticator;
}
/**
* Callback function that is called when the authenticator is registered
*
* Use this method for initialization of a newly registered authenticator.
* Just overload this method and it will be called when the authenticator
* is registered.
* <b>If the method returns FALSE, the authenticator won't be
* registered!</b>
*
* @return bool Returns TRUE on success, FALSE otherwise.
*/
protected static function on_register() {
return true;
}
/**
* Callback function that is called when an authenticator is removed.
*
* @return bool
*/
protected static function on_unregister() {
return true;
}
}
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