Permissions panel.

Content.Shared/Network/NetMessages/MsgEuiMessage.cs

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+using System;
+using System.IO;
+using Content.Shared.Eui;
+using Lidgren.Network;
+using Robust.Shared.Interfaces.Network;
+using Robust.Shared.Interfaces.Serialization;
+using Robust.Shared.IoC;
+using Robust.Shared.Network;
+
+namespace Content.Shared.Network.NetMessages
+{
+    public sealed class MsgEuiMessage : NetMessage
+    {
+        #region REQUIRED
+
+        public const MsgGroups GROUP = MsgGroups.Command;
+        public const string NAME = nameof(MsgEuiMessage);
+
+        public MsgEuiMessage(INetChannel channel) : base(NAME, GROUP) { }
+
+        #endregion
+
+        public uint Id;
+        public EuiMessageBase Message;
+
+        public override void ReadFromBuffer(NetIncomingMessage buffer)
+        {
+            Id = buffer.ReadUInt32();
+
+            var ser = IoCManager.Resolve<IRobustSerializer>();
+            var len = buffer.ReadVariableInt32();
+            var stream = buffer.ReadAlignedMemory(len);
+            Message = ser.Deserialize<EuiMessageBase>(stream);
+        }
+
+        public override void WriteToBuffer(NetOutgoingMessage buffer)
+        {
+            buffer.Write(Id);
+            var stream = new MemoryStream();
+
+            var ser = IoCManager.Resolve<IRobustSerializer>();
+            ser.Serialize(stream, Message);
+            var length = (int)stream.Length;
+            buffer.WriteVariableInt32(length);
+            buffer.Write(stream.GetBuffer().AsSpan(0, length));
+        }
+    }
+}