Summary
In this chapter, we added three different implementations of profile pictures to our chat application. First we asked the authentication service to provide a URL for us to use. We did this by using Gomniauth's abstraction of the user resource data, which we then included as part of the user interface every time a user would send a message. Using Go's zero (or default) initialization pattern, we were able to refer to different implementations of our Avatar interface without actually creating any instances.
We stored data in a cookie for when the user would log in. Therefore, and also given the fact that cookies persist between builds of our code, we added a handy logout feature to help us validate our changes, which we also exposed to our ...
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