在Joomla!的安装中,我们有几个预定义的User事件,这些事件在触发时会调用相关插件中的函数。
This event authorises that a particular user should be able to login. The system triggers this event after the user has been authenticated and before he has been signed in the website. It is possible to be triggered by plugin types User and Authentication.
JAuthenticationResponse or NULL (NULL if you would like to miss the authorisation)
The system triggers this event when the user has been authenticated but he has not been authorised to login. You should only use this event in User plugins.
void (it does not return any value or object)
This event is triggered after the user is authenticated against the Joomla! user-base.
If you need to abort the login process (authentication), you will need to use onUserAuthenticate instead.
Boolean
This event is triggered before the user is logged out of the system.
If any plugin returns false, the global logout fails and the onUserLogoutFailure event is fired; if it succeeds, onUserAfterLogout event is triggered instead.
NOTE: as of 3.3.6, returning false does not work correctly, because stock components perform their logout operation during the onUserLogout event. So even if your plugin returns false, the stock ones have already run anyway. Thus, the user will be "mostly" logged out even if you return false. There is no actual way to cleanly abort logout.
Boolean
This event is triggered whenever a user authentication request is failed by any plugin.
Two parameters. The credentials array for the user (see onAuthenticate), and the JAuthenticationResponse that caused the failure.
Unknown. The return value appears to be ignored in any case.
This event is triggered whenever a user is successfully logged in.
Options is array with:
Boolean
This event is triggered before an update of a user record.
The old and new user parameters are provided; commonly-used members are: username, name, email, password, password_clear.
The password array entry is the hashed password value. If the user has just changed the password, you may retrieve the cleartext password from $newUser['password_clear']. (It will be set to "" if the password has not been changed.)
Boolean. Whether the user-save should proceed or not. Any plugin that returns false aborts the save.
This event is triggered after an update of a user record, or when a new user has been stored in the database.
Password in $user array is already hashed at this point. You may retrieve the cleartext password using $_POST['password'].
Note: The old values that were just updated are not available here or afterwards. In case you need the old values, use onBeforeStoreUser().
None
The event is triggered when a user is about to be deleted from the system.
None. If you want to prevent the user from being deleted, you may abort the delete by redirecting back to the User Manager. For example:
if ($this->deleteNotAllowed($data))
{
$url = JRoute::_('index.php?option=com_users&view=users', false);
$msg = JText::sprintf('PLG_USER_DELETE_NOT_ALLOWED', $data['username']);
$app = Factory::getApplication();
$app->enqueueMessage($msg, 'error');
$app->redirect($url);
}
The event is triggered after a user has been deleted from the system.
None.
To modify Joomla! login process upon your needs (e.g. creating AJAX output for login), it may be useful to know the order of the events to be fired.
Wrong credentials | CORRECT CREDENTIALS and the user is not blocked (is activated) | CORRECT CREDENTIALS and the user is blocked (is not activated) |
---|---|---|
onUserAuthenticate returns TRUE or FALSE | | \ / onUserLoginFailure |
onUserAuthenticate returns TRUE or FALSE | | \ / onUserLogin returns FALSE -> END returns TRUE | | \ / onUserAfterLogin |
onUserAuthenticate returns TRUE or FALSE | | \ / onUserLogin returns TRUE or FALSE | | \ / END |
Example idea Let's assume you want to preform Ajax login. You have already overriden a mod_login form so it's posted to Joomla! via an AJAX call. You added a field named ajax to the form. So when the form is posted and authentication is failed, your custom plugin must return some JSON data.
public function onUserLoginFailure($response)
{
$input = JFactory::getApplication()->input;
// If a non-ajax form was posted, we do not modify the behavior
if (!$input->post->get('ajax', false))
{
return;
}
$app = JFactory::getApplication();
$task_failed = false;
// Fill this array with the data you want to return, e.g. $response['status'] may be useful
// Check libraries/joomla/user/authentication.php for available status codes
$data = array('status' => $response['status']);
// At least here in the plugin it's a must to send proper headers
JFactory::getApplication()->setHeader('Content-Type', 'application/json', true)->sendHeaders();
echo new JResponseJson($data, $response['error_message'], $task_failed);
// Closing app is a must here to return JSON immediately
$app->close();
}