libr-2/app/controllers/omniauth_callback_controller.rb

class OmniauthCallbackController < Devise::OmniauthCallbacksController
  def self.provides_callback_for(provider)
    class_eval %Q{
      def #{provider}
        @user = User.find_for_oauth(env["omniauth.auth"], current_user)
        if @user.persisted?
          sign_in_and_redirect @user, event: :authentication
          set_flash_message(:notice, :success, kind: "#{provider}".capitalize) if is_navigational_format?
        else
          session["devise.#{provider}_data"] = env["omniauth.auth"]
          Rails.logger.info '注册失败...'
          redirect_to new_user_registration_url
        end
      end
    }
  end

  [:weibo].each do |provider|
    provides_callback_for provider
  end

  def after_sign_in_path_for(resource)
    if resource.email_verified?
      super resource
    else
      finish_signup_path(resource)
    end
  end
end