How can I get the current user in an operation hook? I've tried the guide using context vice versa but can't get it to work. Also reading that the loopback-contex is depricated.

https://docs.strongloop.com/display/public/LB/Using+current+context#Usingcurrentcontext-Configurecontextpropagation

Here is my operation hook:
Model.observe('before save', function (ctx, next) {
ctx.accessToken....
}