devise omniauth-fb carrierwave 登入

安裝 gem

/Gemfile  
gem "devise"
gem "omniauth-facebook"

設定 devise

/config/initializiers/devise.rb
config.omniauth :facebook, Settings.story.fb_app_id, Settings.story.fb_secret, {:provider_ignores_state => true}

add the omniauthable model to the devise method in our User model.

/app/models/user.rb
class User < ActiveRecord::Base
  devise :database_authenticatable, :registerable, :omniauthable,
         :recoverable, :rememberable, :trackable, :validatable
end

如此會產生兩個routes

user_omniauth_authorize
GET|POST /users/auth/:provider(.:format) omniauth_callbacks#passthru {:provider=>/facebook/}

user_omniauth_callback GET|POST /users/auth/:action/callback(.:format) omniauth_callbacks#(?-mix:facebook)

建立一個omniauth_callbacks的controller來處理以上的這些資訊

設定

/routes.rb
devise_for :users, controllers: {omniauth_callbacks: "omniauth_callbacks"}

/app/controllers/omniauth_callbacks_controller.rb
  1 class OmniauthCallbacksController < Devise::OmniauthCallbacksController
  2
  3   def all
  4     user = User.from_omniauth(request.env["omniauth.auth"])
  5     if user.persisted?
  6       sign_in_and_redirect user, notice: "Signed in!"
  7     else
  8       session["devise.user_attributes"] = user.attributes
  9       redirect_to new_user_registration_url
 10     end
 11   end
 12
 13   alias_method :facebook, :all
 14 end

user要多增加欄位來存provider和uid

增加上述的from_omniauth

/app/models/user.rb
 19   def self.from_omniauth(auth)
 20     where(auth.slice(:provider, :uid)).first_or_create do |user|
 21       user.provider = auth.provider
 22       user.uid = auth.uid
 23       user.email = auth.info.email
 24       user.name = auth.info.name
 25       user.remote_image_url = auth.info.image.gsub('http://','https://')
 26     end
 27   end

增加new_with_session

/app/models/user.rb
 29   def self.new_with_session(params, session)
 30     if session["devise.user_attributes"]
 31       new(session["devise.user_attributes"], without_protection: true) do |user|
 32         user.attributes = params
 33         user.valid?
 34       end
 35     else
 36       super
 37     end
 38   end

password_required?

/app/models/user.rb
 40   def update_with_password(params, *options)
 41     if encrypted_password.blank?
 42       update_attributes(params, *options)
 43     else
 44       super
 45     end
 46   end
 47
 48   def password_required?
 49     super && provider.blank?
 50   end
 51
 52   def email_required?
 53     super && provider.blank?
 54   end