how to implement single sign on using telligent REST sdk and sitecore?

Hello Team,

We are using Telligent REST sdk to populate telligent community data on sitecore site. As of now we are manually providing existing user credential to pull telligent data on sitecore site as below,

var host = Host.Get("default");

var restHost = Telligent.Evolution.Extensibility.Rest.Version1.Host.Get("default");
restHost.ResolveLocalUser = (host1, resolveArgs) =>
{
return new Telligent.Evolution.Extensibility.Rest.Version1.LocalUser("admin", "***@i*********);
};

Now we need to implement single sing by using default sitecore login user, so can you please help me to provider some pointers to implement single sign-on functionality.