Omniauth-Facebook回调在Rails可安装引擎中未初始化 [英] Omniauth-Facebook callback does not get initialised in Rails Mountable Engine

问题描述

我正在开发一个可安装的引擎（称为SimpleUser），它使用Devise，OmniAuth和OmniAuth-Facebook。首先，我做了一个测试应用程序与宝石关于和一切工作正常。接下来，我从头开始构建引擎，使用测试应用程序的代码作为示例。

I'm developing a mountable engine (called SimpleUser) which uses Devise, OmniAuth and OmniAuth-Facebook. First I made a test app with the gems about and every worked fine. Next, I started building the engine from scratch, using the code of the test app as an example.

除了与Facebook的连接之外，所有内容都已完成Javascript弹出窗口）。当我点击登录时，显示FB弹出窗口，我授予应用程序，它重定向到指定的路由（参见路线），但会抛出此错误：

Everything is almost done, except for the connection with Facebook (it uses the Javascript popup). When I click in "log in" the FB popup is displayed, I grant the app, it redirects to the route specified (see routes), but throws this error:

NoMethodError in SimpleUser::AuthController#create
undefined method `[]' for nil:NilClass

该行为出现错误，在 authentication = Authentication.find_by_provider_and_uid（auth ['provider']，auth ['uid']）其中 auth 是nil（ auth 来自 auth = request.env [omniauth.auth] ）

The error occurs in that action, in the line authentication = Authentication.find_by_provider_and_uid(auth['provider'], auth['uid']) where auth is nil (auth comes from auth = request.env["omniauth.auth"]).

我检查的一件事是回调阶段没有初始化。这是测试应用程序的日志：

One thing I check is that the Callback phase it's no initialised. This is the log of the test app:

在2013-03-03开始获取127.0.0.1的/ auth / facebook / callback 14
08:52:56 -0600（facebook）回调阶段启动。处理
AuthController＃create as HTML参数：{provider=>facebook}

Started GET "/auth/facebook/callback" for 127.0.0.1 at 2013-03-14 08:52:56 -0600 (facebook) Callback phase initiated. Processing by AuthController#create as HTML Parameters: {"provider"=>"facebook"}

这是日志的引擎应用程序：

This is the log of the engine app:

Started GET "/simple_user/auth/facebook/callback" for 127.0.0.1 at 2013-03-14 08:51:19 -0600
Processing by SimpleUser::AuthController#create as HTML
  Parameters: {"provider"=>"facebook"}

为了管理OmniAuth，我将gem添加到.gemspec和Gemfile;而且，我需要引擎中的宝石，而在引擎的发生器内，我会在安装过程中将omniauth.rb的模板移动到父应用的配置/初始化器。这是我所拥有的：

For manage OmniAuth, I added the gem to the .gemspec and to the Gemfile; also, I require the gems in the engine, and within a generator of the engine I move a template of omniauth.rb to config/initializers of the parent app during installation. This is what I have:

AuthController（位于app / controllers / simple_user / auth_controller.rb）

module SimpleUser
  class AuthController < ApplicationController

    def create
      auth = request.env["omniauth.auth"]   
      authentication = Authentication.find_by_provider_and_uid(auth['provider'], auth['uid'])

      if authentication
        flash[:notice] = "Signed in successfully."
        sign_in(:user, authentication.user)
        redirect_to root_url
      else
        user = User.build_new_auth(auth)
        #user.apply_omniauth(auth)
        if user.save(:validate => false)
          flash[:notice] = "Account created and signed in successfully."
          sign_in(:user, user)
          redirect_to root_url
        else
          flash[:error] = "Error while creating the user account. Please try again."
          redirect_to root_url
        end
      end
    end

  end
end

引擎

module SimpleUser

  require 'rubygems'
  require 'devise'
  require 'cancan'
  require 'rolify'
  require 'omniauth'
  require 'omniauth-facebook'
  require 'simple_form'

  class Engine < ::Rails::Engine
    isolate_namespace SimpleUser

    config.before_configuration do
      env_file = File.join(Rails.root, 'config', 'fb_config.yml')
      YAML.load(File.open(env_file)).each do |key, value|
        ENV[key.to_s] = value.to_s
      end if File.exists?(env_file)

      env_file = File.join(Rails.root, 'config', 'devise_config.yml')
      YAML.load(File.open(env_file)).each do |key, value|
        ENV[key.to_s] = value.to_s
      end if File.exists?(env_file)
    end
  end
end

生成器

module SimpleUser
  module Generators
    class InstallGenerator < ::Rails::Generators::Base
      source_root File.expand_path("../templates", __FILE__)
      desc "Install SimpleUser"

      def copy_config_file
        copy_file "fb_config.yml", "config/fb_config.yml"
        copy_file "devise_config.yml", "config/devise_config.yml"
        copy_file "omniauth.rb", "config/initializers/omniauth.rb"
      end

      def copy_migrations
        rake "simple_user:install:migrations"
        SimpleUser::Engine.load_seed
      end

    end
  end
end

omniauth的模板。 rb

require 'omniauth'
require 'omniauth-facebook'

OmniAuth.config.logger = Rails.logger

Rails.application.config.middleware.use OmniAuth::Builder do
    provider :facebook, ENV['FACEBOOK_KEY'], ENV['FACEBOOK_SECRET'], :scope => ENV['FACEBOOK_SCOPE']
end

路线（引擎） strong>

Routes (on engine)

match 'auth/:provider/callback', to: 'auth#create'
match 'auth/failure', to: redirect('/')

路由（在虚拟应用程序）

mount SimpleUser::Engine => "/simple_user", :as => "simple_user"

.gemspec依赖关系

  s.add_dependency "rails", "~> 3.2.12"
  s.add_dependency "devise"
  s.add_dependency "cancan"
  s.add_dependency "rolify"
  s.add_dependency "omniauth"
  s.add_dependency "omniauth-facebook", "1.4.1"
  s.add_dependency "simple_form"

  #s.add_development_dependency "mysql2"
  s.add_development_dependency "sqlite3"
  s.add_development_dependency "jquery-rails"
  s.add_development_dependency "debugger"

Gemfile

source "http://rubygems.org"

gemspec

gem 'devise'
gem 'cancan'
gem 'rolify'
gem 'omniauth'
gem 'omniauth-facebook', '1.4.1'
gem 'simple_form'

# Development
gem 'jquery-rails'
gem 'debugger'

我认为问题是没有初始化的回调，原因可能是OmniAuth没有加载，但我不知道是否和如何解决。

I think the problem is the callback that is not initialised, and the reason may be that OmniAuth doesn't get loaded, but I don't know if it is and how to solve it.

您可以在 https://github.com/pablomarti/simple_user 中查看项目，如果你想克隆它，并测试你可以使用生成器 rails g simple_user：install ，你可以看到test / dummy的代码也可以得到这个想法。

You can check the project in https://github.com/pablomarti/simple_user, and if you want to clone it and test you can use the generator rails g simple_user:install, and you can see the code of test/dummy also to get the idea.

非常感谢您提前。

推荐答案

解决方案是要删除omniauth.rb并在引擎中包含OmniAuth的中间件，所以引擎看起来像这样：

The solution was to remove the omniauth.rb and include the middleware of OmniAuth in the engine, so the engine looks like this:

module SimpleUser

  require 'rubygems'
  require 'devise'
  require 'cancan'
  require 'rolify'
  require 'omniauth'
  require 'omniauth-facebook'
  require 'simple_form'

  class Engine < ::Rails::Engine
    isolate_namespace SimpleUser

    middleware.use OmniAuth::Builder do
      provider :facebook, ENV['FACEBOOK_KEY'], ENV['FACEBOOK_SECRET'], :scope => ENV['FACEBOOK_SCOPE']
    end

    config.before_configuration do
      env_file = File.join(Rails.root, 'config', 'fb_config.yml')
      YAML.load(File.open(env_file)).each do |key, value|
        ENV[key.to_s] = value.to_s
      end if File.exists?(env_file)

      env_file = File.join(Rails.root, 'config', 'devise_config.yml')
      YAML.load(File.open(env_file)).each do |key, value|
        ENV[key.to_s] = value.to_s
      end if File.exists?(env_file)
    end

  end
end

> https://stackoverflow.com/a/8413724/347501 在类似的问题。

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