add support for per-id access on AccessReaderComponent (#13659)

* add support for per-id access on AccessReaderComponent

* comments!!!

* oh yeah we predicting baby

* foobar

* sloth review

* weh

Content.Shared/StationRecords/StationRecordKeyStorageSystem.cs

@@ -0,0 +1,79 @@
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.StationRecords;
+
+public sealed class StationRecordKeyStorageSystem : EntitySystem
+{
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<StationRecordKeyStorageComponent, ComponentGetState>(OnGetState);
+        SubscribeLocalEvent<StationRecordKeyStorageComponent, ComponentHandleState>(OnHandleState);
+    }
+
+    private void OnGetState(EntityUid uid, StationRecordKeyStorageComponent component, ref ComponentGetState args)
+    {
+        args.State = new StationRecordKeyStorageComponentState(component.Key);
+    }
+
+    private void OnHandleState(EntityUid uid, StationRecordKeyStorageComponent component, ref ComponentHandleState args)
+    {
+        if (args.Current is not StationRecordKeyStorageComponentState state)
+            return;
+        component.Key = state.Key;
+    }
+
+    /// <summary>
+    ///     Assigns a station record key to an entity.
+    /// </summary>
+    /// <param name="uid"></param>
+    /// <param name="key"></param>
+    /// <param name="keyStorage"></param>
+    public void AssignKey(EntityUid uid, StationRecordKey key, StationRecordKeyStorageComponent? keyStorage = null)
+    {
+        if (!Resolve(uid, ref keyStorage))
+        {
+            return;
+        }
+
+        keyStorage.Key = key;
+        Dirty(keyStorage);
+    }
+
+    /// <summary>
+    ///     Removes a station record key from an entity.
+    /// </summary>
+    /// <param name="uid"></param>
+    /// <param name="keyStorage"></param>
+    /// <returns></returns>
+    public StationRecordKey? RemoveKey(EntityUid uid, StationRecordKeyStorageComponent? keyStorage = null)
+    {
+        if (!Resolve(uid, ref keyStorage) || keyStorage.Key == null)
+        {
+            return null;
+        }
+
+        var key = keyStorage.Key;
+        keyStorage.Key = null;
+        Dirty(keyStorage);
+
+        return key;
+    }
+
+    /// <summary>
+    ///     Checks if an entity currently contains a station record key.
+    /// </summary>
+    /// <param name="uid"></param>
+    /// <param name="keyStorage"></param>
+    /// <returns></returns>
+    public bool CheckKey(EntityUid uid, StationRecordKeyStorageComponent? keyStorage = null)
+    {
+        if (!Resolve(uid, ref keyStorage))
+        {
+            return false;
+        }
+
+        return keyStorage.Key != null;
+    }
+}