OAuth 1.0a for ETrade API using Haskell

Lately, I have been interested in creating a market quotes receiver which later on, using a DB and ML algorithms, will analyze the market movements and provide suggestions for better investments. But initially, I had to connect to an API provided, for which I found ETrade, which is an Online Broker stablished in the USA which has a REST API to request quotes, account data or even place orders to the Stock Exchange.

I have been long time fan of Haskell, but I had never engaged with a long term project to learn more about the language, the platform and all its possibilities, although I have a book pending to continue writing about Haskell FRP for Game development, this project seems like a good time/learn investment for long term goals: apply category theory, learn to trade stocks, explore Machine Learning algorithms and many more.

For all that, I started doing authentication to the platform, considering that I had to email ETrade customer service to request a Auth public/private key, then later with those in file, I created this script which will perform all necessary steps to retrieve a access token, which would allow me to query everything within the Sandbox: so here is the code:

DNSCrypt on Ubuntu

After setting up a shared wireless connection, I started to be worried about the "plainness" of the transmissions, that everything which would go through the air and the router could be simply read by another received and use that information to another purpose. Of course, there is the always reliable TOR network, but due to a quite high latency already increased, then I decided to skip it. Nonetheless, I still wanted something running on every request and that would increase a little the privacy, then I found DNSCryopt. In other words:

DNSCrypt encrypts all DNS traffic between your computer and the OpenDNS servers (so you'll be using OpenDNS) and can protect you from man-in-the-middle attacks, spying, resolver impersonation, can prevent Internet service providers from blocking various websites and more.

Configure an Ubuntu "Gateway"

The original title was going to be:

Configure an Ubuntu "Gateway" using two wireless devices and one server

But it was going to be long and boring. Ok, everything started because I have moved to a new location and I was not going to have internet in a long time nor willing to get a two year contract with a company again. So, connection from my supporting neighbor was provided, the only thing I had to do is to create an extension to his wireless AP. Easily enough I could had bought a WiFi extender, but no fun was going to be out of there and of course, if he would like to sniff what was going trough, well you know the history.

Fortunately I have this hardware ready to be set up:

VIA ARTiGO Pico-ITX Builder Kit A1000
Alfa AWUS036NH
WiDrive DX325

I could explain the network, but better seen graphically: