Scraper to get transactions out of my bank accounts

itau.rb

# encoding: UTF-8

require 'mechanize'
require 'money'
require 'ostruct'

module Itau
  class Session < Struct.new(:ci, :pass)
    def login
      login_page = agent.get(itaurl)
      login_form = login_page.form_with(:name => "form1")
      login_form.set_fields(:nro_documento => ci, :password => pass)
      Dashboard.new(login_form.submit)
    end

    def logout
      agent.get(itaurl)
    end

    def agent
      @agent ||= Mechanize.new do |agent|
        agent.user_agent_alias = "Windows IE 7"
      end
    end

    def itaurl
      "https://www.itaulink.com.uy/appl/index.jsp"
    end
  end

  class Dashboard < Struct.new(:page)
    CURRENCIES = {
      "Pesos"   => "UYU",
      "Dólares" => "USD",
      "Euros"   => "EUR"
    }

    def checking_accounts
      account_links("Cuentas Corrientes") do |link|
        Account.new(:checking, account_currency(link), link.text, link.click)
      end
    end

    def savings_accounts
      account_links("Cajas de Ahorro") do |link|
        Account.new(:savings, account_currency(link), link.text, link.click)
      end
    end

    private

    def account_currency(link)
      curr = link.node.search("../../following-sibling::*[./font[contains(.,'Pesos') or contains(.,'lares') or contains(.,'Euros')]]")
      CURRENCIES.fetch(curr.text.strip)
    end

    def account_links(text, &block)
      page.links.select do |link|
        link.node.xpath("../../../..//font[contains(.,'#{text}')]").any?
      end.map(&block)
    end
  end

  class Account < Struct.new(:type, :currency, :number, :page)
    def transactions
      page.search(".//tr[./td[contains(.,'Concepto')]]/following-sibling::*").map do |tr|
        cells = tr.search("td").map(&:text)
        cells[2..-1].map! { |s| "#{s} #{currency}".to_money if s =~ /\d+/ }
        Transaction.new(*cells)
      end
    end
  end

  class Transaction < Struct.new(:date, :description, :expense, :income, :balance)
    @@date  = lambda do |str|
      months = %W(ENE FEB MAR ABR MAY JUN JUL AGO SET OCT NOV DIC)
      matches = str.match /(?<day>\d{2})(?<month>\w{3})(?<year>\d{4})/
      matches && Date.new(matches[:year].to_i, months.index(matches[:month]) + 1, matches[:day].to_i)
    end

    def initialize(date, *args)
      super @@date[date], *args
    end
  end
end

Una forma de usarlo es

session = Itau::Session.new("3.628.628-4", "secret85")
dashboard = session.login
dashboard.checking_accounts.each do |account|
  p account.transactions
end
dashboard.savings_accounts.each do |account|
  p account.transactions
end

Tengo que seguir jugando con esto para llegar a sacar información útil, y agregar las tarjetas de crédito también :)