Security: Complex Access Controls with Expressions¶

In addition to a role like ROLE_ADMIN, the isGranted() method also accepts an Symfony\Component\ExpressionLanguage\Expression object:

use Symfony\Component\ExpressionLanguage\Expression;
// ...

public function index()
{
    $this->denyAccessUnlessGranted(new Expression(
        '"ROLE_ADMIN" in role_names or (not is_anonymous() and user.isSuperAdmin())'
    ));

    // ...
}

In this example, if the current user has ROLE_ADMIN or if the current user object’s isSuperAdmin() method returns true, then access will be granted (note: your User object may not have an isSuperAdmin() method, that method is invented for this example).

This uses an expression and you can learn more about the expression language syntax, see The Expression Syntax.

Inside the expression, you have access to a number of variables:

user

The user object (or the string anon if you’re not authenticated).

role_names

An array with the string representation of the roles the user has. This array includes any roles granted indirectly via the role hierarchy but it does not include the IS_AUTHENTICATED_* attributes (see the functions below).

object

The object (if any) that’s passed as the second argument to isGranted().

subject

It stores the same value as object, so they are equivalent.

token

The token object.

trust_resolver

The Symfony\Component\Security\Core\Authentication\AuthenticationTrustResolverInterface, object: you’ll probably use the is_*() functions below instead.

Additionally, you have access to a number of functions inside the expression:

is_authenticated()

Returns true if the user is authenticated via “remember-me” or authenticated “fully” - i.e. returns true if the user is “logged in”.

is_anonymous()

Returns true if the user is anonymous. That is, the firewall confirms that it does not know this user’s identity. This is different from IS_AUTHENTICATED_ANONYMOUSLY, which is granted to all users, including authenticated ones.

is_remember_me()

Similar, but not equal to IS_AUTHENTICATED_REMEMBERED, see below.

is_fully_authenticated()

Equal to checking if the user has the IS_AUTHENTICATED_FULLY role.

is_granted()

Checks if the user has the given permission. Optionally accepts a second argument with the object where permission is checked on. It’s equivalent to using the isGranted() method from the authorization checker service.

use Symfony\Component\ExpressionLanguage\Expression;
use Symfony\Component\Security\Core\Authorization\AuthorizationCheckerInterface;
// ...

public function index(AuthorizationCheckerInterface $authorizationChecker)
{
    $access1 = $authorizationChecker->isGranted('IS_AUTHENTICATED_REMEMBERED');

    $access2 = $authorizationChecker->isGranted(new Expression(
        'is_remember_me() or is_fully_authenticated()'
    ));
}