How to change role hierarchy storage in Symfony2?

Question

In my project I need to store role hierarchy in database and create new roles dynamically. In Symfony2 role hierarchy is stored in security.yml by default. What

Answer 1

Since role hierarchy don't change often, this a quick class to cache to memcached.

hierarchy = $hierarchy;

        $roleMap = $memcache->get('roleMap');

        if ($roleMap) {
            $this->map = unserialize($roleMap);
        } else {
            $this->buildRoleMap();
            // cache to memcache
            $memcache->set('roleMap', serialize($this->map));
        }
    }

    /**
     * {@inheritdoc}
     */
    public function getReachableRoles(array $roles)
    {
        $reachableRoles = $roles;
        foreach ($roles as $role) {
            if (!isset($this->map[$role->getRole()])) {
                continue;
            }

            foreach ($this->map[$role->getRole()] as $r) {
                $reachableRoles[] = new Role($r);
            }
        }

        return $reachableRoles;
    }

    protected function buildRoleMap()
    {
        $this->map = array();
        foreach ($this->hierarchy as $main => $roles) {
            $this->map[$main] = $roles;
            $visited = array();
            $additionalRoles = $roles;
            while ($role = array_shift($additionalRoles)) {
                if (!isset($this->hierarchy[$role])) {
                    continue;
                }

                $visited[] = $role;
                $this->map[$main] = array_unique(array_merge($this->map[$main], $this->hierarchy[$role]));
                $additionalRoles = array_merge($additionalRoles, array_diff($this->hierarchy[$role], $visited));
            }
        }
    }
}