In this chapter, we added a useful and necessary feature to our chat application by asking users to authenticate themselves using OAuth2 service providers before we allow them to join the conversation. We made use of several open source packages, such as
Gomniauth, which dramatically reduced the amount of multiserver complexity we would otherwise have dealt with.
We implemented a pattern when we wrapped
http.Handler types to allow us to easily specify which paths require the user to be authenticated and which were available, even without an
auth cookie. Our
MustAuth helper function allowed us to generate the wrapper types in a fluent and simple way, without adding clutter and confusion to our code.