Always allow access to /robots.txt for Anonymous (#37807).

Patch by Holger Just.


git-svn-id: https://svn.redmine.org/redmine/trunk@21939 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/welcome_controller.rb

@@ -20,6 +20,8 @@
 class WelcomeController < ApplicationController
   self.main_menu = false
 
+  skip_before_action :check_if_login_required, only: [:robots]
+
   def index
     @news = News.latest User.current
   end

test/integration/welcome_test.rb

@@ -42,4 +42,12 @@ class WelcomeTest < Redmine::IntegrationTest
     # closed projects are included in the list
     assert @response.body.match(%r{^Disallow: /projects/subproject1/issues\r?$})
   end
+
+  def test_robots_when_login_is_required
+    with_settings :login_required => '1' do
+      get '/robots.txt'
+      assert_response :success
+      assert_equal 'text/plain', @response.media_type
+    end
+  end
 end