使用具有多种识别方法的 ActionCable

问题描述

我使用 ActionCable 开发了一个 Ruby on Rails 5.1 应用程序.通过设计进行用户身份验证 适用于多个渠道.现在，我想添加不需要任何用户身份验证的第二种渠道.更准确地说，我想让匿名网站访问者与支持人员聊天.

I develop a Ruby on Rails 5.1 application using ActionCable. User authentification via Devise works fine for several channels. Now, I want to add a second type of channels which does not require any user authentification. More precisely, I would like to enable anonymous website visitors to chat with support staff.

我当前为经过身份验证的用户实现的 ApplicationCable::Connection 如下所示:

My current implementation of ApplicationCable::Connection for authenticated users looks like this:

# 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

    protected

    def find_verified_user
      user = User.find_by(id: cookies.signed['user.id'])
      return user if user
      fail 'User needs to be authenticated.'
    end
  end
end

匿名用户将通过一些随机 UUID 进行识别(SecureRandom.urlsafe_base64).

Anonymous users will be identified by some random UUID (SecureRandom.urlsafe_base64).

问题:

如何最好地添加这种新型频道?我可以在某处添加一个布尔标志 require_authentification，在我继承的通道类中覆盖它以进行匿名通信，并根据这个属性在 Connection 中切换识别方法吗?或者我更愿意实现一个全新的模块，比如 AnonymousApplicationCable?

How do I best add this new type of channels? Could I add a boolean flag require_authentification somewhere, override it in my inherited channel class for anonymous communication, and switch the identification method in Connection depending on this attribute? Or would I rather have to implement a completely new module, say AnonymousApplicationCable?

推荐答案

我遇到了同样的问题，在 rails github 评论中查看了您的解决方案后，我认为最好创建令牌并将逻辑保留在连接方法.

Hi I came into the same problem, after looking at your solution in rails github comment, I assume it is better to create the token and keep the logic in the connect method.

所以我所做的只是利用监狱长检查，如果它为零，则创建匿名令牌，否则.为此，我需要声明 2 个标识符 :uuid 和 :current_user

So what I do was just utillize the the warden checking and if it is nil just create the anonymous token and otherwise. For this to work, I need to declare 2 identifier :uuid and :current_user

class Connection < ActionCable::Connection::Base
identified_by :current_user, :uuid


 def connect

   if !env['warden'].user
     self.uuid = SecureRandom.urlsafe_base64
   else
     self.current_user = find_verified_user
   end

 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

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