IDs and access (#319)

* something about access

* Fixed deny animation

Content.Server/GameObjects/Components/Access/AccessReaderComponent.cs

@@ -0,0 +1,86 @@
+using System.Collections.Generic;
+using Content.Server.Interfaces.GameObjects;
+using Content.Shared.GameObjects.Components.Inventory;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.Serialization;
+using Robust.Shared.ViewVariables;
+
+namespace Content.Server.GameObjects.Components.Access
+{
+    [RegisterComponent]
+    public class AccessReader : Component
+    {
+        public override string Name => "AccessReader";
+        private List<string> _necessaryTags;
+        private List<string> _sufficientTags;
+
+        public bool IsAllowed(IEntity entity)
+        {
+            var accessProvider = FindAccessProvider(entity);
+            return accessProvider != null && IsAllowed(accessProvider);
+        }
+
+        private bool IsAllowed(AccessComponent accessProvider)
+        {
+            foreach (var sufficient in _sufficientTags)
+            {
+                if (accessProvider.Tags.Contains(sufficient))
+                {
+                    return true;
+                }
+            }
+            foreach (var necessary in _necessaryTags)
+            {
+                if (!accessProvider.Tags.Contains(necessary))
+                {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+        [CanBeNull]
+        private static AccessComponent FindAccessProvider(IEntity entity)
+        {
+            if (entity.TryGetComponent(out AccessComponent accessComponent))
+            {
+                return accessComponent;
+            }
+
+            if (entity.TryGetComponent(out IHandsComponent handsComponent))
+            {
+                var activeHandEntity = handsComponent.GetActiveHand?.Owner;
+                if (activeHandEntity != null &&
+                    activeHandEntity.TryGetComponent(out AccessComponent handAccessComponent))
+                {
+                    return handAccessComponent;
+                }
+            }
+            else
+            {
+                return null;
+            }
+            if (entity.TryGetComponent(out InventoryComponent inventoryComponent))
+            {
+                if (inventoryComponent.HasSlot(EquipmentSlotDefines.Slots.IDCARD) &&
+                    inventoryComponent.TryGetSlotItem(EquipmentSlotDefines.Slots.IDCARD, out ItemComponent item) &&
+                    item.Owner.TryGetComponent(out AccessComponent idAccessComponent)
+                    )
+                {
+                    return idAccessComponent;
+                }
+            }
+            return null;
+        }
+
+        public override void ExposeData(ObjectSerializer serializer)
+        {
+            base.ExposeData(serializer);
+
+            serializer.DataField(ref _necessaryTags, "necessary" ,new List<string>());
+            serializer.DataField(ref _sufficientTags, "sufficient", new List<string>());
+        }
+    }
+}