Learn to build a Ruby on Rails Application.

SESSION & TWITTER AUTH

git checkout -b user-auth

modify Gemfile.rb

  gem 'omniauth'
  gem 'omniauth-twitter'

create sign_in partial

touch app/views/layouts/_sign_in.haml

  .row
    .large-2.columns.large-centered
      - unless current_user
        = link_to "Sign Up/In", "/users/auth/twitter", class: "button small radius"
      - else
        = link_to "logout", destroy_user_session_path, method: "DELETE"

modify app/views/layouts/application.html.erb

  <%= render "layouts/sign_in" %>

create a new app on twitter

visit https://apps.twitter.com/

description

reviews, reviews, reviews, reviews, reviews, reviews, reviews.
#### site
http://www.rubyonrailstutor.com
#### callback url
http://127.0.0.1/auth/twitter/callback
#### click allow this app to be used to sign in with twitter

set environmental variables in ~/.bash_profile

  export RESTAURANTLY_TWITTER_KEY='yourspecialkey'
  export RESTAURANTLY_TWITTER_SECRET='yourspecialsecret'

source ~/.bash_profile

modify config/initializers/devise.rb

  config.omniauth :twitter, ENV['RESTAURANTLY_TWITTER_KEY'], ENV['RESTAURANTLY_TWITTER_SECRET']

modify config/routes.rb

  devise_for :users, :controllers => { :omniauth_callbacks => "users/omniauth_callbacks"}

modify app/models/user.rb

  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable, :omniauthable

mkdir app/controllers/users

touch app/controllers/users/omniauth_callbacks_controller.rb

  # props to @auser
  # the below is mangled a bit from https://leanpub.com/angularjs-rails

  class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController

    def twitter
      auth_hash = request.env["omniauth.auth"]
      uid = auth_hash["uid"]
      name = auth_hash["info"]["name"]
      handle = auth_hash["info"]["nickname"]
      auth = Authorization.find_by_provider_and_uid("twitter", uid)

      if auth
        user = auth.user
      else

        unless current_user
          unless user = User.find_by_name(name)
            user = User.create name: name, password: Devise.friendly_token[0,8],
              email: "default@mail.com", twitter: handle
          end
        else
          user = current_user
        end
        unless auth = user.authorizations.find_by_provider("twitter")
          auth = user.authorizations.build provider: "twitter", uid: uid
          user.authorizations << auth
        end

        auth.update_attributes uid: uid, token: auth_hash['credentials']['token'],
          secret: auth_hash["credentials"]['secret'], name: name, url: "https://twitter.com/#{name}"
      end

      if user
        sign_in_and_redirect user, :event => :authentication
      else
        redirect_to :new_user_registration
      end
    end

  end

resources

https://github.com/intridea/omniauth
https://github.com/arunagw/omniauth-twitter