Tenant aware resources

[vpratfr]

Here is how you can hide resources when switched to a tenant or to the system tenant in Nova using #5

Some traits

trait TenantAwareResource
{
    public static function availableForNavigation(Request $request)
    {
        $isTenantResource = static::$system === false;
        $isCustomerTenant = optional(app(Environment::class)->website())->is_admin_tenant !== true ?? false;

        return ($isTenantResource && $isCustomerTenant)
               || (!$isTenantResource && !$isCustomerTenant);
    }
}

trait IsSystemResource
{
    use TenantAwareResource;

    protected static $system = true;
}

trait IsTenantResource
{
    use TenantAwareResource;

    protected static $system = false;
}

Then you simply need to use the trait in your resources to show/hide them based on the context.