Method authenticate

/**
 * Finds out if a set of login credentials are valid by asking all observing
 * objects to run their respective authentication routines.
 *
 * @param   array  $credentials  Array holding the user credentials.
 * @param   array  $options      Array holding user options.
 *
 * @return  AuthenticationResponse  Response object with status variable filled in for last plugin or first successful plugin.
 *
 * @see     AuthenticationResponse
 * @since   1.7.0
 */
public function authenticate($credentials, $options = array())
{
    // Get plugins
    $plugins = PluginHelper::getPlugin($this->pluginType);
    // Create authentication response
    $response = new AuthenticationResponse();
    /*
     * Loop through the plugins and check if the credentials can be used to authenticate
     * the user
     *
     * Any errors raised in the plugin should be returned via the AuthenticationResponse
     * and handled appropriately.
     */
    foreach ($plugins as $plugin) {
        $plugin = Factory::getApplication()->bootPlugin($plugin->name, $plugin->type);
        if (!method_exists($plugin, 'onUserAuthenticate')) {
            // Bail here if the plugin can't be created
            Log::add(Text::sprintf('JLIB_USER_ERROR_AUTHENTICATION_FAILED_LOAD_PLUGIN', $plugin->name), Log::WARNING, 'jerror');
            continue;
        }
        // Try to authenticate
        $plugin->onUserAuthenticate($credentials, $options, $response);
        // If authentication is successful break out of the loop
        if ($response->status === self::STATUS_SUCCESS) {
            if (empty($response->type)) {
                $response->type = $plugin->_name ?? $plugin->name;
            }
            break;
        }
    }
    if (empty($response->username)) {
        $response->username = $credentials['username'];
    }
    if (empty($response->fullname)) {
        $response->fullname = $credentials['username'];
    }
    if (empty($response->password) && isset($credentials['password'])) {
        $response->password = $credentials['password'];
    }
    return $response;
}