CakePHP multitenant routing

before_filter.php

<?php 

// Validates tenant
switch (isset($this->request->params['tenant'])) {
    case true:
        // The tennant should exist
        $this->loadModel('Tenant');
        if ($this->Tenant->isExist($this->request->params['tenant']) == 0) {
            throw new NotFoundException();
        }
        break;

    case false:
        // On-premises mode
        $this->redirect(array(
            'tenant' => 'manually-set-customer-name'
        ));
        break;
}