services_controller.rb

class ServicesController < ApplicationController  before_filter :authenticate_user!, :except => [:create]  def index  # get all authentication services assigned to the current user  @services = current_user.services.all 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  def create  # get the service parameter from the Rails router  params[:service] ? service_route = params[:service] : service_route = 'no service (invalid callback)'   # get the full hash from omniauth  omniauth = request.env['omniauth.auth']   # continue only if hash and parameter exist  if omniauth and params[:service]        # map the returned hashes to our variables first - the hashes differ for every service    if service_route == 'facebook'      omniauth['extra']['user_hash']['email'] ? email =  omniauth['extra']['user_hash']['email'] : email = ''      omniauth['extra']['user_hash']['name'] ? name =  omniauth['extra']['user_hash']['name'] : name = ''      omniauth['extra']['user_hash']['id'] ?  uid =  omniauth['extra']['user_hash']['id'] : uid = ''      omniauth['provider'] ? provider =  omniauth['provider'] : provider = ''    elsif service_route == 'github'      omniauth['user_info']['email'] ? email =  omniauth['user_info']['email'] : email = ''      omniauth['user_info']['name'] ? name =  omniauth['user_info']['name'] : name = ''      omniauth['extra']['user_hash']['id'] ?  uid =  omniauth['extra']['user_hash']['id'] : uid = ''      omniauth['provider'] ? provider =  omniauth['provider'] : provider = ''    elsif service_route == 'twitter'      email = ''    # Twitter API never returns the email address      omniauth['user_info']['name'] ? name =  omniauth['user_info']['name'] : name = ''      omniauth['uid'] ?  uid =  omniauth['uid'] : uid = ''      omniauth['provider'] ? provider =  omniauth['provider'] : provider = ''    else      # we have an unrecognized service, just output the hash that has been returned      render :text => omniauth.to_yaml      #render :text => uid.to_s + " - " + name + " - " + email + " - " + provider      return    end      # continue only if provider and uid exist    if uid != '' and provider != ''              # nobody can sign in twice, nobody can sign up while being signed in (this saves a lot of trouble)      if !user_signed_in?                # check if user has already signed in using this service provider and continue with sign in process if yes        auth = Service.find_by_provider_and_uid(provider, uid)        if auth          flash[:notice] = 'Signed in successfully via ' + provider.capitalize + '.'          sign_in_and_redirect(:user, auth.user)        else          # check if this user is already registered with this email address; get out if no email has been provided          if email != ''            # search for a user with this email address            existinguser = User.find_by_email(email)            if existinguser              # map this new login method via a service provider to an existing account if the email address is the same              existinguser.services.create(:provider => provider, :uid => uid, :uname => name, :uemail => email)              flash[:notice] = 'Sign in via ' + provider.capitalize + ' has been added to your account ' + existinguser.email + '. Signed in successfully!'              sign_in_and_redirect(:user, existinguser)            else              # let's create a new user: register this user and add this authentication method for this user              name = name[0, 39] if name.length > 39             # otherwise our user validation will hit us               # new user, set email, a random password and take the name from the authentication service              user = User.new :email => email, :password => SecureRandom.hex(10), :fullname => name               # add this authentication service to our new user              user.services.build(:provider => provider, :uid => uid, :uname => name, :uemail => email)               # do not send confirmation email, we directly save and confirm the new record              user.skip_confirmation!              user.save!              user.confirm!               # flash and sign in              flash[:myinfo] = 'Your account on CommunityGuides has been created via ' + provider.capitalize + '. In your profile you can change your personal information and add a local password.'              sign_in_and_redirect(:user, user)            end          else            flash[:error] =  service_route.capitalize + ' can not be used to sign-up on CommunityGuides as no valid email address has been provided. Please use another authentication provider or use local sign-up. 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        # the user is currently signed in                # check if this service is already linked to his/her account, if not, add it        auth = Service.find_by_provider_and_uid(provider, uid)        if !auth          current_user.services.create(:provider => provider, :uid => uid, :uname => name, :uemail => email)          flash[:notice] = 'Sign in via ' + provider.capitalize + ' has been added to your account.'          redirect_to services_path        else          flash[:notice] = service_route.capitalize + ' is already linked to your account.'          redirect_to services_path        end        end      else      flash[:error] =  service_route.capitalize + ' returned invalid data for the user id.'      redirect_to new_user_session_path    end  else    flash[:error] = 'Error while authenticating via ' + service_route.capitalize + '.'    redirect_to new_user_session_path  end end