Question

我正在开发一种可安装引擎（称为SimpleUser），它使用Devise，OmniAuth和OmniAuth-Facebook。首先，我用宝石制作了一个测试应用程序，并且每个工作正常。接下来，我开始从头开始构建引擎，使用测试应用程序的代码作为示例。

除了与Facebook的连接（它使用Javascript弹出窗口）之外，一切都快要完成了。当我点击“登录”时会显示FB弹出窗口，我授予应用程序，它会重定向到指定的路由（请参阅路由），但会抛出此错误：

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

该行动发生错误，行authentication = Authentication.find_by_provider_and_uid(auth['provider'], auth['uid']) auth 为零（ auth 来自auth = request.env["omniauth.auth"]）。

我检查的一件事是Callback阶段没有初始化。这是测试应用程序的日志：

2013-03-14开始获取127.0.0.1的GET“/ auth / facebook / callback” 08:52:56 -0600（facebook）回调阶段已启动。处理方式 AuthController＃create as HTML参数：{“provider”=＆gt;“facebook”}

这是引擎应用的日志：

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中;另外，我需要引擎中的gem，并且在引擎的生成器中我将omniauth.rb的模板移动到安装期间父app的config / initializers。这就是我所拥有的：

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

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

发电机

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.rb的模板

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（在引擎上）

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

路线（在虚拟应用上）

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

.gemspec依赖

  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"

的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，但我不知道它是否以及如何解决它。

你可以在https://github.com/pablomarti/simple_user中检查项目，如果你想克隆它并测试你可以使用生成器rails g simple_user:install，你也可以看到test / dummy的代码来获得想法。

非常感谢你。

Answer 1

解决方案是删除omniauth.rb并在引擎中包含OmniAuth的中间件，因此引擎看起来像这样：

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

感谢Dmitry Lihachev在类似问题上的回答https://stackoverflow.com/a/8413724/347501。

Omniauth-Facebook回调不会在Rails可安装引擎中初始化

1 个答案: