refresh oauth token

Gemfile

@@ -65,6 +65,8 @@ group :development do
   gem 'thin'
 
   # gem 'capistrano', '~> 3.0.1'
+
+  gem 'pry-rails'
 end
 
 group :production do
@@ -86,3 +88,5 @@ gem 'action-gmailer', github: 'popgiro/action-gmailer'
 # compose html mail
 gem 'nokogiri'
 gem 'premailer'
+
+gem 'faraday'

Gemfile.lock

@@ -92,6 +92,7 @@ GEM
     mail (2.5.4)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
+    method_source (0.8.2)
     mime-types (1.25.1)
     mini_portile (0.5.2)
     minitest (4.7.5)
@@ -121,6 +122,12 @@ GEM
     premailer (1.7.9)
       css_parser (>= 1.1.9)
       htmlentities (>= 4.0.0)
+    pry (0.9.12.3)
+      coderay (~> 1.0)
+      method_source (~> 0.8)
+      slop (~> 3.4)
+    pry-rails (0.3.2)
+      pry (>= 0.9.10)
     rack (1.5.2)
     rack-mini-profiler (0.1.31)
       rack (>= 1.1.3)
@@ -155,6 +162,7 @@ GEM
     sdoc (0.3.20)
       json (>= 1.1.3)
       rdoc (~> 3.10)
+    slop (3.4.7)
     sprockets (2.10.1)
       hike (~> 1.2)
       multi_json (~> 1.0)
@@ -194,12 +202,14 @@ DEPENDENCIES
   coderay
   coffee-rails (~> 4.0.0)
   devise
+  faraday
   jbuilder (~> 1.2)
   mail
   nokogiri
   omniauth-google-oauth2
   pg
   premailer
+  pry-rails
   rack-mini-profiler
   rails (~> 4.0.2)
   rails_12factor

app/controllers/concerns/rv/mailer.rb

@@ -358,10 +358,6 @@ __HTML__
 
     html_body += <<'__HTML__'
 
-            <div style="font-weight: bold; font-size: 18px; line-height: 24px; color: #D03C0F;">
-            Quick Two Columns to Rows Demo
-            </div>
-
             <br>
 
             </td>

app/controllers/posts_controller.rb

@@ -56,8 +56,13 @@ class PostsController < ApplicationController
   def mail
     @post = set_post
 
+    # refresh google oauth token if expired
+    current_user.google_oauth_token_refresh! if current_user.google_oauth_token_expired?
+
     compose_mail(@post, current_user).deliver
     redirect_to root_path(id: @post.id)
+  rescue ActionGmailer::DeliveryError
+    redirect_to root_path(id: @post.id), flash: { notice: 'Gmail authentication expired.' }
   end
 
   # GET /posts/1/edit

app/controllers/users/omniauth_callbacks_controller.rb

 class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
 
   def google_oauth2
-      # You need to implement the method below in your model (e.g. app/models/user.rb)
-      @user = User.find_for_google_oauth2(request.env["omniauth.auth"], current_user)
+    # You need to implement the method below in your model (e.g. app/models/user.rb)
+    @user = User.find_for_google_oauth2(request.env["omniauth.auth"], current_user)
 
-      if @user.persisted?
-        flash[:notice] = I18n.t "devise.omniauth_callbacks.success", :kind => "Google"
-        sign_in_and_redirect @user, :event => :authentication
-      else
-        session["devise.google_data"] = request.env["omniauth.auth"]
-        redirect_to new_user_registration_url
-      end
+    if @user.persisted?
+      flash[:notice] = I18n.t "devise.omniauth_callbacks.success", :kind => "Google"
+      sign_in_and_redirect @user, :event => :authentication
+    else
+      session["devise.google_data"] = request.env["omniauth.auth"]
+      redirect_to new_user_registration_url
+    end
   end
 
 end

app/models/user.rb

+require 'faraday'
+
 class User < ActiveRecord::Base
   # Include default devise modules. Others available are:
   # :confirmable, :lockable, :timeoutable and :omniauthable
@@ -10,7 +12,7 @@ class User < ActiveRecord::Base
   # Device
   def self.find_for_google_oauth2(access_token, signed_in_resource=nil)
     data = access_token.info
-    user = User.where(:email => data["email"]).first
+    user = User.where(email: data["email"]).first
 
     unless user
       user = User.create(name: data["name"],
@@ -19,7 +21,39 @@ class User < ActiveRecord::Base
         password: Devise.friendly_token[0,20]
       )
     end
-    user.update_attribute(:google_auth_token, access_token.credentials['token'])
+
+    user.update_attributes(
+      google_auth_token: access_token.credentials['token'],
+      google_refresh_token: access_token.credentials['refresh_token'],
+      google_token_expires_at: Time.at(access_token.credentials['expires_at'])
+    )
+
     user
   end
+
+  # check if google oauth token is expired
+  def google_oauth_token_expired?
+    self.google_token_expires_at < Time.now
+  end
+
+  # refresh google oauth token
+  def google_oauth_token_refresh!
+    conn = Faraday.new(url: 'https://accounts.google.com') do |builder|
+      builder.request  :url_encoded
+      builder.adapter  :net_http
+    end
+    response = conn.post '/o/oauth2/token', {
+      client_id: ENV["GOOGLE_KEY"],
+      client_secret: ENV["GOOGLE_SECRET"],
+      refresh_token: self.google_refresh_token,
+      grant_type: "refresh_token"
+    }
+    res_json = JSON.parse(response.body)
+
+    self.update_attributes(
+      google_auth_token: res_json['access_token'],
+      google_token_expires_at: Time.now + res_json['expires_in'].seconds
+    )
+  end
+
 end

config/initializers/omniauth.rb

@@ -3,7 +3,8 @@ Rails.application.config.middleware.use OmniAuth::Builder do
     {
       :name => "google_oauth2",
       :scope => "https://mail.google.com/, userinfo.email, userinfo.profile",
-      :prompt => "select_account",
+      access_type: 'offline',
+      :prompt => "select_account consent",
       :image_aspect_ratio => "square",
       :image_size => 50
     }

db/migrate/20131228110818_add_refresh_token_to_user.rb

+class AddRefreshTokenToUser < ActiveRecord::Migration
+  def change
+    add_column :users, :google_refresh_token, :string
+    add_column :users, :google_token_expires_at, :datetime
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20131226161253) do
+ActiveRecord::Schema.define(version: 20131228110818) do
 
   create_table "post_tags", force: true do |t|
     t.integer  "post_id",    null: false
@@ -45,17 +45,19 @@ ActiveRecord::Schema.define(version: 20131226161253) do
     t.string   "image_url"
     t.datetime "created_at"
     t.datetime "updated_at"
-    t.string   "email",                  default: "", null: false
-    t.string   "encrypted_password",     default: "", null: false
+    t.string   "email",                   default: "", null: false
+    t.string   "encrypted_password",      default: "", null: false
     t.string   "reset_password_token"
     t.datetime "reset_password_sent_at"
     t.datetime "remember_created_at"
-    t.integer  "sign_in_count",          default: 0,  null: false
+    t.integer  "sign_in_count",           default: 0,  null: false
     t.datetime "current_sign_in_at"
     t.datetime "last_sign_in_at"
     t.string   "current_sign_in_ip"
     t.string   "last_sign_in_ip"
     t.string   "google_auth_token"
+    t.string   "google_refresh_token"
+    t.datetime "google_token_expires_at"
   end
 
   add_index "users", ["email"], name: "index_users_on_email", unique: true