osint/app/Policies/GroupPolicy.php

<?php

namespace App\Policies;

use App\Models\Group;
use App\Models\User;

class GroupPolicy
{
    public function viewAny(User $user): bool
    {
        return true;
    }

    public function view(User $user, Group $group): bool
    {
        return $group->isAccessibleBy($user);
    }

    public function create(User $user): bool
    {
        return true;
    }

    public function update(User $user, Group $group): bool
    {
        return $group->owner_id === $user->id;
    }

    public function delete(User $user, Group $group): bool
    {
        return $group->owner_id === $user->id;
    }

    /**
     * Only the owner can add/remove members.
     */
    public function manageMembers(User $user, Group $group): bool
    {
        return $group->owner_id === $user->id;
    }
}