Rails Action Cable: How to authorize incoming connection?

Question

I am trying to implement authorization on the websocket connection (rails 5.2.1)

Following the rubyonrails guideline, I have created the connection.rb as follows:

# app/channels/application_cable/connection.rb

module ApplicationCable
  class Connection < ActionCable::Connection::Base
    identified_by :current_user

    def connect
      self.current_user = find_verified_user
    end

    private
      def find_verified_user
        if verified_user = User.find_by(id: cookies.encrypted[:user_id])
          verified_user
        else
          reject_unauthorized_connection
        end
      end
  end
end

Unfortunately, all the websocket connection requests are rejected. (I have figured out that cookies.encrypted[:user_id] is returning nil.)

Started GET "/cable" for ::1 at 2018-10-07 21:33:46 +0300
Started GET "/cable/" [WebSocket] for ::1 at 2018-10-07 21:33:46 +0300
Successfully upgraded to WebSocket (REQUEST_METHOD: GET, HTTP_CONNECTION: Upgrade, HTTP_UPGRADE: websocket)
  User Load (0.5ms)  SELECT  "users".* FROM "users" WHERE "users"."is_active" = $1 AND "users"."id" IS NULL LIMIT $2  [["is_active", true], ["LIMIT", 1]]
  ↳ app/channels/application_cable/connection.rb:12
An unauthorized connection attempt was rejected
Failed to upgrade to WebSocket (REQUEST_METHOD: GET, HTTP_CONNECTION: Upgrade, HTTP_UPGRADE: websocket)
Finished "/cable/" [WebSocket] for ::1 at 2018-10-07 21:33:46 +0300
Finished "/cable/" [WebSocket] for ::1 at 2018-10-07 21:33:46 +0300

Would you please guide me how I can access current user info within app/channels/application_cable/connection.rb?

Answer 1

In order to get current_user from Devise, you need to change your connection.rb as follows:

module ApplicationCable
  class Connection < ActionCable::Connection::Base
    identified_by :current_user

    def connect
      self.current_user = find_verified_user
      logger.add_tags 'ActionCable', current_user.email
    end

    protected

    def find_verified_user # this checks whether a user is authenticated with devise
      if verified_user = env['warden'].user
        verified_user
      else
        reject_unauthorized_connection
      end
    end
  end
end