Implementing Gravatar

Gravatar is a web service that allows users to upload a single profile picture and associate it with their e-mail address to make it available from any website. Developers, like us, can access those images for our application, just by performing a GET operation on a specific API endpoint. In this section, we will see how to implement Gravatar rather than use the picture provided by the authentication service.

Abstracting the avatar URL process

Since we have three different ways of obtaining the avatar URL in our application, we have reached the point where it would be sensible to learn how to abstract the functionality in order to cleanly implement the options. Abstraction refers to a process in which we separate the idea of something from its specific implementation. http.Handler is a great example of how a handler will be used along with its ins and outs, without being specific about what action is taken by each handler.

In Go, we start to describe our idea of getting...