Three credit checker

three_credit_check.rb

require 'capybara'
require 'headless'
require 'twilio-ruby'

THREE_USERNAME = ENV['THREE_USERNAME']
THREE_PASSWORD = ENV['THREE_PASSWORD']
TWILIO_SID = ENV['TWILIO_SID']
TWILIO_AUTH = ENV['TWILIO_AUTH']
PHONE = ENV['PHONE']

THRESHOLD = 9.99

@twilio = Twilio::REST::Client.new(TWILIO_SID, TWILIO_AUTH)

def get_credit
    Headless.ly do
        session = Capybara::Session.new(:selenium)

        # Sign into My3
        session.visit('https://sso.three.co.uk/mylogin/?service=https%3A%2F%2Fwww.three.co.uk%2FThreePortal%2Fappmanager%2FThree%2FSelfcareUk%3F_pageLabel%3DP22200581501288714397101%26_nfpb%3Dtrue%26&resource=portlet')
        session.find('#username').set(THREE_USERNAME)
        session.find("#j_password").set(THREE_PASSWORD)
        session.find(".buttonInner14").click

        # Navigate to credit page
        session.find(:xpath, './/a[contains(., "Check your balance.")]').click

        # Read credit
        return session.find("#balanceBody td.alignRight").text.gsub('£', '').to_f
    end
end

def send_text(number, message)
    @twilio.api.account.messages.create(
        from: '+447446382408',
        to: number,
        body: message
    )
end

unless THREE_PASSWORD && THREE_PASSWORD && TWILIO_AUTH && TWILIO_SID && PHONE
    puts "missing ENVs"
    exit
end

credit = get_credit

if credit <= THRESHOLD
    msg = "You have £%5.2f credit, which is below your set threshold of £%5.2f." % [credit, THRESHOLD]
    send_text(PHONE, msg)
end