Extending & Customizing

Because every capability is a contract bound in the container, extension is just a binding.

Swap an implementation

Rebind any contract in a service provider — yours wins over the package default:

use Cbox\Id\Identity\Contracts\Subjects;

$this->app->singleton(Subjects::class, MySubjects::class);

Your class implements the same interface. Callers are untouched because they depend on the contract, not the class.

Decorate behaviour

Wrap the package implementation to add cross-cutting behaviour (metrics, extra validation, notifications) without forking it:

$this->app->extend(Subjects::class, function (Subjects $inner, $app) {
    return new NotifyingSubjects($inner, $app->make(Notifier::class));
});

Override a model's tenant column

Tenant-owned models use the BelongsToTenant trait and default to an organization_id column. Override tenantColumn() if your table differs. Every tenant-owned model must also implement TenantOwned — that's what engages the global scope.

use Cbox\Id\Kernel\Tenancy\Concerns\BelongsToTenant;
use Cbox\Id\Kernel\Tenancy\Contracts\TenantOwned;

final class Widget extends Model implements TenantOwned
{
    use BelongsToTenant;

    public function tenantColumn(): string
    {
        return 'org_id';
    }
}

Implementing an AssertionValidator

Federation deliberately leaves the SAML/OIDC signature validation to you, behind one contract, so you can wrap a vetted, maintained library rather than hand-rolling XML-signature or JWT verification (that's how XSW/XXE/alg-confusion breaches happen).

use Cbox\Id\Federation\Contracts\AssertionValidator;
use Cbox\Id\Federation\Contracts\Connections;
use Cbox\Id\Federation\Models\Connection;
use Cbox\Id\Identity\ValueObjects\FederatedPrincipal;

final class SamlAssertionValidator implements AssertionValidator
{
    public function __construct(private readonly Connections $connections) {}

    public function validate(Connection $connection, string $rawResponse): FederatedPrincipal
    {
        $config = $this->connections->config($connection); // decrypted IdP config

        // Delegate to a vetted library (e.g. onelogin/php-saml), configured from $config,
        // which verifies the signature, audience, conditions and timestamps and parses XML
        // with external entities disabled. It MUST throw on anything it can't fully trust.
        $assertion = /* ...validate with the library... */;

        return new FederatedPrincipal(
            provider: 'saml',
            subject: $assertion->nameId(),
            email: $assertion->attribute('email'),
            name: $assertion->attribute('displayName'),
            connectionId: $connection->id,
            raw: $assertion->all(),
        );
    }
}

Bind it, then feed the trusted principal to FederationFlow::completeLogin() — the rest of the login (user, membership, session, events, audit) is provider-agnostic and already built.

$this->app->singleton(AssertionValidator::class, SamlAssertionValidator::class);

Custom crypto / storage backends

The kernel contracts are pluggable too:

• SecretBox — swap libsodium for a KMS/HSM-backed sealer for managed deployments.
• KeyManager — back signing keys with an external key store.
• RelationshipStore — replace the Postgres ReBAC engine if you ever outgrow it.

All keep the same contract, so the modules above them don't change.