security.php
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<?php
use Phalcon\Events\Event,
    Phalcon\Mvc\User\Plugin,
    Phalcon\Mvc\Dispatcher,
    Phalcon\Acl;
    class security extends Plugin
    {
        public function getAcl()
        {
            if (!isset($this->persistent->acl)) {
                $acl = new Phalcon\Acl\Adapter\Memory();
                $acl->setDefaultAction(Phalcon\Acl::DENY);
                //Register roles
                $roles = array(
                    "admin" => new Phalcon\Acl\Role('Admin'),
                    'guests' => new Phalcon\Acl\Role('Guests'),
                    'user' => new Phalcon\Acl\Role('User'),
                    'staff' => new Phalcon\Acl\Role('Staff')
                );
                foreach ($roles as $role) {
                    $acl->addRole($role);
                }
                //Private area resources
                $adminResources = array(
                    "seo"=>array("index")
                );
                foreach ($adminResources as $resource => $actions) {
                    $acl->addResource(new Phalcon\Acl\Resource($resource), $actions);
                }
                //Public area resources
                $publicResources = array(
                    'page' => array('index','login',"logout")
                );
                foreach ($publicResources as $resource => $actions) {
                    $acl->addResource(new Phalcon\Acl\Resource($resource), $actions);
                }
                //Grant access to public areas
                foreach ($roles as $role) {
                    foreach ($publicResources as $resource => $actions) {
                        $acl->allow($role->getName(), $resource, '*');
                    }
                }
                //Grant acess to private area to role Admin
                foreach ($adminResources as $resource => $actions) {
                    foreach ($actions as $action){
                        $acl->allow('Admin', $resource, $action);
                    }
                }
                //The acl is stored in session, APC would be useful here too
                $this->persistent->acl = $acl;
            }
            return $this->persistent->acl;
        }
        /**
         * This action is executed before execute any action in the application
         */
        public function check(Dispatcher $dispatcher)
        {
            $controller = $dispatcher->getControllerName();
            $action = $dispatcher->getActionName();
            $acl = $this->getAcl();
            if ($this->session->get("user-status")){
                $status = $this->session->get("user-status");
            } else {
                $status = 'Guests';
            }
            $allowed = $acl->isAllowed($status, $controller, $action);
            if ($allowed) {
                return true;
            } else {
                return false;
            }
        }
}