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Network Authority
Authority is a way of deciding who owns an object and has control over it.
Server Authority
Server authority means that the server has control of an object. Server has authority over an object by default. This means the server would manage and control of all collectible items, moving platforms, NPCs, and any other networked objects that aren't the player.
Client Authority
Client authority means that the client has control of an object.
When a client has authority over an object it means that they can call Commands and that the object will automatically be destroyed when the client disconnects.
Even if a client has authority over an object the server still controls SyncVar and control other serialization features. A component will need to use a Commands to update the state on the server in order for it to sync to other clients.
How to give authority
By default the server has Authority over all objects. The server can give authority to objects that a client needs to control, like the player object.
If you spawn a player object using NetworkServer.AddPlayerForConnection then it will automatically be given authority.
Using NetworkServer.Spawn
You can give authority to a client when an object is spawned. This is done by passing in the connection to the spawn message
GameObject go = Instantiate(prefab);
NetworkServer.Spawn(go, connectionToClient);
Using identity.AssignClientAuthority
You can give authority to a client any time using AssignClientAuthority. This can be done by calling AssignClientAuthority on the object you want to give authority too
identity.AssignClientAuthority(conn);
You may want to do this when a player picks up an item
// Command on player object
void CmdPickupItem(NetworkIdentity item)
{
item.AssignClientAuthority(connectionToClient);
}
How to remove authority
You can use identity.RemoveClientAuthority to remove client authority from an object.
identity.RemoveClientAuthority();
Authority can't be removed from the player object. Instead you will have to replace the player object using NetworkServer.ReplacePlayerForConnection.
On Authority
When authority is given to or removed from an object a message will be sent to that client to notify them. This will cause the OnStartAuthority or OnStopAuthority functions to be called.
Check Authority
Client Side
The identity.hasAuthority property can be used to check if the local player has authority over an object.
Server Side
The identity.connectionToClient property can be check to see which client has authority over an object. If it is null then the server has authority.