google_client_login.rb

# coding: utf-8

require 'rubygems'
require 'net/https'
require 'net/http'
require 'rack'

email = Rack::Utils.escape('your google account mail address')
password = Rack::Utils.escape('your google account password')
service = 'local'
source = 'corp-app-0.1'
path = '/accounts/ClientLogin'

data = ["accountType=HOSTED_OR_GOOGLE",
  "Email=#{email}",
  "Passwd=#{password}",
  "service=#{service}",
  "source=#{source}"].join('&')

http = Net::HTTP.new('www.google.com', 443)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE

token = ''
headers = {'Content-Type' => 'application/x-www-form-urlencoded'}
http.start do |http|
  response,body = http.post(path, data, headers)
  token = body[/Auth=(.*)/, 1]
end

headers['Authorization'] = "GoogleLogin auth=#{token}"

uri = URI.parse('http://maps.google.com/maps/feeds/maps/default/full')
Net::HTTP.start(uri.host, uri.port) do |http|
  resp = http.get(uri.path, headers)
  p resp.body
end