services_controller.rb

class ServicesController < ApplicationController
  def index
    @services = current_user.services.all
  end
  
  def create
    # get the service parameter from the Rails router
    params[:service] ? service_route = params[:service] : service_route = 'no service (invalid callback)'

    omniauth = request.env['omniauth.auth']

    if omniauth and params[:service]

      if service_route == 'facebook'
        email = omniauth['info']['email']
        first_name = omniauth['info']['first_name']
        last_name = omniauth['info']['last_name']
        uid =  omniauth['uid']
        # image =  omniauth['info']['image']
        provider =  omniauth['provider']
      end

      # if service_route == 'twitter'
      #   email = omniauth['info']['email']
      #   first_name = ""
      #   last_name = ""
      #   uid =  omniauth['uid']
      #   provider =  omniauth['provider']
      # end

      if uid != '' and provider != ''

        # Check if the user is already signed in
        unless signed_in?
          # We're going to create a new Facebook user

          # Check if the user already signed in using this provider
          auth = Service.find_by_provider_and_uid(provider, uid)

          if auth
            flash[:success] = 'Signed in successfully via ' + provider.capitalize + '.'
            sign_in_and_redirect(:user, auth.user)
          else
            if email != ''
              # Check if the user is already registered with this email
              existing_user = User.find_by_email(email)
              if existing_user
                existing_user.services.create(:provider => provider,
                  :uid => uid, :first_name => first_name,
                  :last_name => last_name, :email => email)
                flash[:success] = 'Sign in via ' + provider.capitalize + ' has been added to your account. Signed in successfully.'
                sign_in_and_redirect(:user, existing_user)
              else
                # let's create a new user: register this user and add this authentication method for this user

                username = SecureRandom.hex(16)

                # new user, set email, a random password and take the name from the authentication service
                user = User.new :email => email, :password => SecureRandom.hex(10), :first_name => first_name,
                  :last_name => last_name, :username => username

                # if provider == 'twitter'
                #   user.sign_up_via_twitter = true
                # end

                # add this authentication service to our new user
                user.services.build(:provider => provider, :uid => uid, :first_name => first_name,
                  :last_name => last_name, :email => email)

                user.save!

                flash[:success] = 'Your account on Artburst has been created via ' + provider.capitalize + '.'
                sign_in_and_redirect(:user, user)
              end
            else
              # No valid email has been provided
              flash[:error] =  service_route.capitalize + ' can not be used to sign up for Artburst since no valid email address has been provided. Please use another authentication provider or sign up by email. If you already have an account, please sign-in and add ' + service_route.capitalize + ' from your profile.'
              redirect_to new_user_session_path
            end
          end
        else
          # Add service to an existing account
          auth = Service.find_by_provider_and_uid(provider, uid)
          if !auth
            current_user.services.create(:provider => provider, :uid => uid,
              :first_name => first_name, :last_name => last_name, :email => email)
            flash[:notice] = 'Sign in via ' + provider.capitalize + ' has been added to your account.'
            redirect_to edit_user_path(current_user.username)
          else
            flash[:notice] = service_route.capitalize + ' is already linked to your account.'
            redirect_to edit_user_path(current_user.username)
          end
        end
      else
        flash[:error] =  service_route.capitalize + ' returned invalid data for the user id.'
        redirect_to new_user_session_path
      end
    else
      # There was an error authenticating
      flash[:error] = 'Error while authenticating via ' + service_route.capitalize + '.'
      redirect_to new_user_session_path
    end
  end

  def destroy
    # remove an authentication service linked to the current user
    @service = current_user.services.find(params[:id])
    @service.destroy
    
    redirect_to services_path
  end
end