Station records (#8720)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Server/StationRecords/Systems/StationRecordKeyStorageSystem.cs

@@ -0,0 +1,57 @@
+using Content.Shared.StationRecords;
+
+namespace Content.Server.StationRecords.Systems;
+
+public sealed class StationRecordKeyStorageSystem : EntitySystem
+{
+    /// <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;
+    }
+
+    /// <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;
+
+        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;
+    }
+}