add IP restriction setting

.env.sample

@@ -6,3 +6,4 @@ RV_S3_SECRET_ACCESS_KEY=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
 RV_S3_BACKET_NAME=xxxxxxxxxxxxxxxxxxxxx
 RV_PDF_UPLOADING=1
 DATABASE_URL=mysql2://user:passwd@localhost/rendezvous_development
+RV_ALLOW_IPS=1.1.1.1,2.2.2.2

Gemfile

@@ -158,3 +158,6 @@ gem 'rmagick', :require => 'RMagick'
 # for heroku
 gem 'rails_12factor', group: :production
 gem 'mysql'
+
+# for IP restriction
+gem 'rack-contrib', require: 'rack/contrib'

Gemfile.lock

@@ -282,6 +282,8 @@ GEM
     pry-rails (0.3.2)
       pry (>= 0.9.10)
     rack (1.5.2)
+    rack-contrib (1.2.0)
+      rack (>= 0.9.1)
     rack-mini-profiler (0.9.2)
       rack (>= 1.1.3)
     rack-test (0.6.2)
@@ -466,6 +468,7 @@ DEPENDENCIES
   poltergeist
   premailer
   pry-rails
+  rack-contrib
   rack-mini-profiler
   rails (~> 4.1)
   rails_12factor

config/application.rb

@@ -32,6 +32,11 @@ module Rendezvous
       # oauth2_token: 'FIXME',
       # account:      'FIXME'
     }
+
+    # IP restriction.
+    if Rails.env.production? && ENV['RV_ALLOW_IPS']
+      config.middleware.use Rack::Access, { "/" => ENV['RV_ALLOW_IPS'].split(/,/) }
+    end
   end
 
 end