Creating Burp extensions in Python, the "editor" case

Surely you've heard of the Burp Suite, quite useful software to perform security testing of web applications and in general to play with anything that talks HTTP(S). There's even a free edition which is often more than enough since I mostly use just Proxy and Repeater.

You can even write extensions to automate things or support some weird things you might see on top of HTTP. Burp being written in Java, you can write your extensions in Java. They also allow you to write them in Python or Ruby, using Jython or JRuby.

I needed to write an extension recently, in Python since I don't particularly like Java. This post shares my experience and resulting code.