add recaptcha for signup process

Gemfile

@@ -47,6 +47,7 @@ gem 'bootsnap'
 gem 'addressable'
 gem 'httparty'
 gem 'rakismet'
+gem 'recaptcha', require: "recaptcha/rails"
 
 # needed for looser jpeg header compat
 gem 'ruby-imagespec', :require => "image_spec", :git => "https://github.com/r888888888/ruby-imagespec.git", :branch => "exif-fixes"

Gemfile.lock

@@ -278,6 +278,8 @@ GEM
     raindrops (0.17.0)
     rake (12.0.0)
     rakismet (1.5.4)
+    recaptcha (4.4.1)
+      json
     ref (2.0.0)
     representable (2.3.0)
       uber (~> 0.0.7)
@@ -434,6 +436,7 @@ DEPENDENCIES
   radix62 (~> 1.0.1)
   rails (~> 4.2.0)
   rakismet
+  recaptcha
   responders
   rmagick
   ruby-imagespec!

app/controllers/users_controller.rb

@@ -43,12 +43,17 @@ class UsersController < ApplicationController
   def create
     @user = User.new(params[:user], :as => CurrentUser.role)
     @user.last_ip_addr = request.remote_ip
-    @user.save
-    if @user.errors.empty?
-      session[:user_id] = @user.id
+    if verify_recaptcha(model: @user)
+      @user.save
+      if @user.errors.empty?
+        session[:user_id] = @user.id
+      end
+      set_current_user
+      respond_with(@user)
+    else
+      flash[:notice] = "Sign up failed"
+      redirect_to new_user_path
     end
-    set_current_user
-    respond_with(@user)
   end
 
   def update

app/views/users/new.html.erb

@@ -15,6 +15,8 @@
         <%= f.input :password %>
         <%= f.input :password_confirmation %>
         <%= f.button :submit, "Sign up", :data => { :disable_with => "Signing up..." } %>
+
+        <%= recaptcha_tags %>
       <% end %>
     </div>
   </div>