user.rb

  def self.find_for_oauth(auth, signed_in_resource = nil)

    # Get the identity and user if they exist
    identity = Identity.find_for_oauth(auth)
    user = identity.user
    user = signed_in_resource if user.nil?

    if user.nil?

      # Get the existing user by email if the OAuth provider gives us a verified email
      # If the email has not been verified yet we will force the user to validate it
      email = auth.info.email if auth.info.email && auth.info.verified_email

      user = User.where(:email => email).first if email

      # Create the user if it is a new registration
      if user.nil?
        names  = auth.extra.raw_info.name.gsub(/\s+/m, ' ').strip.split(" ")
        user = User.new(
            first_name: names.first,
            last_name: names.last,
            #username: auth.info.nickname || auth.uid,
            email: email ? email : TEMP_EMAIL,
            password: Devise.friendly_token[0,20]
        )
        user.skip_confirmation!
        user.save!
      end
    end
    # Associate the identity with the user if not already
    if identity.user != user
      identity.user = user
      identity.save!
    end

    user
  end