Issue 4894 - Block requests from mysterious adblocker that concentrates traffic on 21:00 UTC

modules/nginx/templates/site.erb

 <% include_file = lambda do |url| %>
   <% content = Puppet::FileServing::Content.indirection.find(url) %>
   <% if content %>
     <%= content.content %>
   <% else %>
     <% raise StandardError, "Failed to resolve source URL #{url}" %>
   <% end %>
 <% end %>
 
 <% server_name = lambda do |domain, alt_names| %><%= domain %><% @alt_names.each do |name| %>, <%= name %><% end %><% end %>
@@ skipping 54 matching lines @@
 access_log /var/log/nginx/<%= log %> <%= log_format %>;
 
 # redirect server error pages to the static page /50x.html
 #
 error_page 500 502 503 504 /50x.html;
 location = /50x.html
 {
   root /usr/share/nginx/html;
 }
 
+# https://issues.adblockplus.org/ticket/4894
+location /easylistchina+easylist.txt
+{
+  if ($http_user_agent = "")
+  {
+    return 400;
+  }
+}
+
 if ($http_host ~ "^(.+)\.$")
 {
   set $canonical_host $1;
   rewrite ^(.*) $scheme://$canonical_host$1 permanent;
 }
 
 <% if @content %>
   <%= content %>
 <% end %>
 
 <% if @source %>
   <% include_file[source] %>
 <% end %>
 }