準備
- Twitter Developer登録
- Callback urlはローカルで試すために http://0.0.0.0:3000/auth/twitter/callback と設定
Gemfileに以下を追加
gem 'omniauth'
gem 'omniauth-twitter'
で
bundle install
OmniAuthの組み込み
% cat config/initializers/omniauth.rb
Rails.application.config.middleware.use OmniAuth::Builder do
provider :twitter, '[Consumer key]', '[Consumer secret]'
end
[Consumer key]と[Consumer secret]は上で取得したものを設定
スキーマ参照してモデルの設定
https://github.com/intridea/omniauth/wiki/Auth-Hash-Schema
rails g model user provider:string uid:string name:string screen_name:string
rake db:migrate
% cat app/models/user.rb
class User < ActiveRecord::Base
def self.create_with_omniauth(auth)
create! do |user|
user.provider = auth['provider']
user.uid = auth['uid']
user.name = auth['info']['name']
user.screen_name = auth['info']['nickname']
end
end
end
セッション（ログイン・ログアウト）の設定
rails g controller sessions
% cat app/controllers/sessions_controller.rb
class SessionsController < ApplicationController
def callback
auth = request.env["omniauth.auth"]
user = User.find_by_provider_and_uid(auth["provider"], auth["uid"]) || User.create_with_omniauth(auth)
session[:user_id] = user.id
redirect_to root_path, :notice => "Logged in"
end
def destroy
session[:user_id] = nil
redirect_to root_path, :notice => "Logged out"
end
end
Welcomeページの設定
rails g controller welcome index
% cat app/views/layouts/application.html.erb
<!DOCTYPE html>
<html>
<head>
<title>Omniauth</title>
<%= stylesheet_link_tag "application", :media => "all" %>
<%= javascript_include_tag "application" %>
<%= csrf_meta_tags %>
</head>
<body>
<% if current_user %>
<%= current_user.name %>
<%= current_user.screen_name %>
<%= link_to 'Log out', logout_path %>
<% else %>
<%= link_to 'Log in', '/auth/twitter' %>
<% end %>
<%= yield %>
</body>
</html>
アプリケーションコントローラ
% cat app/controllers/application_controller.rb
class ApplicationController < ActionController::Base
protect_from_forgery
def login_required
if session[:user_id]
@current_user = User.find(session[:user_id])
else
redirect_to root_path
end
end
helper_method :current_user
private
def current_user
@current_user ||= User.find(session[:user_id]) if session[:user_id]
end
end
ルーティングの設定
% cat config/routes.rb
Omniauth::Application.routes.draw do
get "welcome/index"
match "/auth/:provider/callback" => "sessions#callback"
match "/logout" => "sessions#destroy", :as => :logout
root :to => 'welcome#index'
end
参考