routes.rb

  root :to => 'home#index'

  #sessions
  post 'auth/:provider/callback' => 'sessions#create'
  post 'auth/failure', :to => 'sessions#failure'

sessions_controller.rb

class SessionsController < ApplicationController
  protect_from_forgery with: :null_session

  def create
    puts request.env['omniauth.auth']
    usr = User.new( auth_params )
    unless User.find_by(:steamid => usr.steamid )
      User.create( usr )
    end
    session[:user_session_id] = usr.steamid
    redirect_to '/'
  end

  def failure

  end

  protected

  def auth_params
    h = Hash.new()
    # poor way to merge it, a temporary solution that works #
    h[:steamid] =  request.env['omniauth.auth'].uid
    h[:nickname] = request.env['omniauth.auth'].info.nickname
    h[:name] = request.env['omniauth.auth'].info.name
    h[:image] = request.env['omniauth.auth'].info.image
    h[:profile]= request.env['omniauth.auth'].extra.raw_info.profileurl
    h

  end

end