Github OAuth with automatic account creation with AuthLogic

users_controller.rb

  def create
    url = 'https://github.com/login/oauth/access_token'
    query = 'client_id=' + Github.config[:client_id] + 
      '&redirect_uri=' + Github.config[:redirect_uri] + 
      '&client_secret=' + Github.config[:secret] + 
      '&code=' + params[:code]
    
    token_response = Curl::Easy.http_post(url, query).body_str
    if token_response.empty?
      flash[:notice] = 'GitHub didn\'t respond. Try again?'
      redirect_to login_path and return
    end
    token = token_response.split('=')[1]
    
    url = 'https://github.com/api/v2/json/user/show?access_token=' + token
    data = JSON::parse(Curl::Easy.http_get(url).body_str)['user']

    @user = User.where(email: data['email']).first

    # Login if the user exists
    unless @user.nil?
      @user_session = UserSession.create(@user)
      redirect_back_or_default(root_url)
      return
    end

    @user = User.new(login: data['login'], email: data['email'], github_access_token: token)
    if @user.save
      redirect_back_or_default root_url
    else
      render :action => :new
    end
  end