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Assets/ThirdParty/Mirror/Examples/AssignAuthority/Scripts/ObserverBehaviour.cs

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+using UnityEngine;
+
+namespace Mirror.Examples.AssignAuthority
+{
+    [AddComponentMenu("")]
+    public class ObserverBehaviour : NetworkBehaviour
+    {
+        [SyncVar(hook = nameof(OnColorChanged))]
+        public Color Color;
+
+        public MeshRenderer MeshRenderer;
+
+        void OnColorChanged(Color _, Color newColor) => MeshRenderer.material.color = newColor;
+    }
+}

Assets/ThirdParty/Mirror/Examples/AssignAuthority/Scripts/ObserverBehaviour.cs.meta

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Assets/ThirdParty/Mirror/Examples/AssignAuthority/Scripts/OwnerBehaviour.cs

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+using System;
+using UnityEngine;
+using Random = UnityEngine.Random;
+
+namespace Mirror.Examples.AssignAuthority
+{
+    [AddComponentMenu("")]
+    public class OwnerBehaviour : NetworkBehaviour
+    {
+        [SyncVar(hook = nameof(OnSecretCodeChanged))]
+        int secretCode;
+        public float NewCodeInterval = 5;
+        float newCodeElapsed;
+
+        public TextMesh CodeDisplay;
+
+        void Awake() =>
+            // Hide the display to start with
+            SetDisplay(false);
+
+        public override void OnStartAuthority() => SetDisplay(true);
+
+        public override void OnStopAuthority() =>
+            // Hide the display when we don't have authority anymore
+            SetDisplay(false);
+
+        public override void OnStartServer() => NewCode();
+
+        public override void OnStartClient()
+        {
+            // host mode: hide display
+            if (isServer) SetDisplay(false);
+        }
+
+        void Update()
+        {
+            newCodeElapsed += Time.deltaTime;
+            if (newCodeElapsed >= NewCodeInterval)
+            {
+                NewCode();
+                newCodeElapsed = 0;
+            }
+        }
+
+        protected override void OnValidate() => syncMode = SyncMode.Owner;
+
+        [Server]
+        public void NewCode() => secretCode = Random.Range(0, 9999);
+
+        void SetDisplay(bool show) =>
+            CodeDisplay.gameObject.SetActive(show);
+
+        void OnSecretCodeChanged(int _, int newCode)
+        {
+            CodeDisplay.text = newCode.ToString("0000");
+        }
+    }
+}

Assets/ThirdParty/Mirror/Examples/AssignAuthority/Scripts/OwnerBehaviour.cs.meta

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Assets/ThirdParty/Mirror/Examples/AssignAuthority/Scripts/Player.cs

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+using UnityEngine;
+
+namespace Mirror.Examples.AssignAuthority
+{
+    [AddComponentMenu("")]
+    public class Player : NetworkBehaviour
+    {
+        [SyncVar]
+        public Color Color;
+
+        public override void OnStartServer()
+        {
+            Color = Random.ColorHSV(0, 1, 1, 1, 1, 1);
+        }
+    }
+}

Assets/ThirdParty/Mirror/Examples/AssignAuthority/Scripts/Player.cs.meta

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Assets/ThirdParty/Mirror/Examples/AssignAuthority/Scripts/UI.cs

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+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Mirror.Examples.AssignAuthority
+{
+    [AddComponentMenu("")]
+    public class UI : NetworkBehaviour
+    {
+        public List<ObserverBehaviour> Objects;
+        public List<Button> Buttons;
+
+        void Awake()
+        {
+            for (int i = 0; i < Buttons.Count; i++)
+            {
+                Button button = Buttons[i];
+                int index = i;
+                button.onClick.AddListener(() =>
+                {
+                    CmdTakeAuthority(index, null /* will be filled by mirror */);
+                });
+            }
+        }
+
+
+        [Command(requiresAuthority = false)]
+        public void CmdTakeAuthority(int index, NetworkConnectionToClient sender)
+        {
+            if (index < 0 || index >= Objects.Count)
+                return;
+            ObserverBehaviour obj = Objects[index];
+            if (obj.netIdentity.connectionToClient != sender)
+            {
+                if (obj.netIdentity.connectionToClient != null)
+                    obj.netIdentity.RemoveClientAuthority();
+                obj.netIdentity.AssignClientAuthority(sender);
+                obj.Color = sender.identity.GetComponent<Player>().Color;
+            }
+            else
+            {
+                obj.netIdentity.RemoveClientAuthority();
+                obj.Color = Color.gray;
+            }
+        }
+
+    }
+}

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