Delta-v/Content.Server/Interaction/InteractionSystem.cs

using Content.Shared.Interaction;
using Content.Shared.Storage;
using JetBrains.Annotations;
using Robust.Server.GameObjects;
using Robust.Shared.Containers;
using Robust.Shared.Player;

namespace Content.Server.Interaction
{
    /// <summary>
    /// Governs interactions during clicking on entities
    /// </summary>
    [UsedImplicitly]
    public sealed partial class InteractionSystem : SharedInteractionSystem
    {
        [Dependency] private readonly SharedContainerSystem _container = default!;
        [Dependency] private readonly UserInterfaceSystem _uiSystem = default!;

        public override bool CanAccessViaStorage(EntityUid user, EntityUid target)
        {
            if (Deleted(target))
                return false;

            if (!_container.TryGetContainingContainer(target, out var container))
                return false;

            if (!TryComp(container.Owner, out StorageComponent? storage))
                return false;

            if (storage.Container?.ID != container.ID)
                return false;

            // we don't check if the user can access the storage entity itself. This should be handed by the UI system.
            return _uiSystem.IsUiOpen(container.Owner, StorageComponent.StorageUiKey.Key, user);
        }
    }
}