agent.rb

require 'faraday'
require 'forwardable'

module Soup
  class Agent
    extend Forwardable

    def initialize(domain = 'https://www.soup.io/')
      @agent ||= faraday(domain)
    end

    def_delegators :@agent, :get, :post, :response_headers, :body, :status

    def faraday(domain)
      Faraday.new(url: domain) do |builder|
        builder.use Faraday::Request::UrlEncoded 
        builder.use Faraday::Response::Logger    
        builder.use Faraday::Adapter::NetHttp 
      end
    end
  end
end

client.rb

require 'cgi'

module Soup
  class Client
    attr_accessor :login, :password, :domain, :agent, :session_id, :soup_user_id

    def initialize(login, password)
      @login    = login
      @password = password
      @agent    = Soup::Agent.new
    end

    def get_session_id(page)
      cookie      = page.headers["set-cookie"]
      cookie      = CGI::Cookie.parse(cookie)
      @session_id = cookie["soup_session_id"].first
      @soup_user_id = cookie["soup_user_id"].first
    end

    def redirect_session
      agent.faraday("http://www.soup.io").get do |req|
        req.url "/remote/generate"
        req.params['referer']     = "http://www.soup.io/everyone"
        req.params['host']        = "#{@login}.soup.io"
        req.params['redirect_to'] = "/"
        req.headers["Cookie"]     = "soup_session_id=#{@session_id}"
      end.headers['location']
    end

    def login
      post = { login: @login, password: @password, commit: 'Log in' }
      get_session_id(@agent.post('/login', post))
      get_session_id(@agent.get(redirect_session))
    end

    def get_default_request
      {
        'post[source]' => '',
        'post[body]' => '',
        'post[id]' => '',
        'post[parent_id]' => '',
        'post[original_id]' => '',
        'post[edited_after_repost]' => '',
        'redirect' => '',
        'commit' => 'Save'
      }
    end

    def post_submit(request)
      agent = @agent.faraday("http://#{@login}.soup.io")
      agent.post('/save', request) do |req|
        req.headers["Cookie"] = "soup_session_id=#{session_id}"
      end
    end

    def new_link(url, title = '', description = '')
      request = get_default_request()
      request['post[type]'] = 'PostLink'
      request['post[source]'] = url
      request['post[title]'] = title
      request['post[body]'] = description
      
      post_submit(request)
    end

    def new_image(url, description = '')
      request = get_default_request()
      request['post[type]'] = 'PostImage'
      request['post[url]'] = url
      request['post[source]'] = url
      request['post[body]'] = description
      
      post_submit(request)
    end

    def new_text(text, title = '')
      request = get_default_request()
      request['post[type]'] = 'PostRegular'
      request['post[title]'] = title
      request['post[body]'] = text
      
      post_submit(request)
    end

    def new_quote(quote, source)
      request = get_default_request()
      request['post[type]'] = 'PostQuote'
      request['post[body]'] = quote
      request['post[title]'] = source
      
      post_submit(request)
    end

    def new_video(youtube_url, description = '')
      request = get_default_request()
      request['post[type]'] = 'PostVideo'
      request['post[embedcode_or_url]'] = youtube_url
      request['post[body]'] = description
      
      post_submit(request)
    end
  end
end

soup_spec.rb

require File.expand_path(File.dirname(__FILE__) + '/spec_helper')

describe "Soup Agent" do
  before do
    @client = Soup::Client.new("login", "password") 
  end

  it "should connect to soup.io" do
    @agent.host.should == "www.soup.io"
  end
end