tilecache: restrict cache control headers to osm.org only

[chef.git] / cookbooks / tilecache / templates / default / nginx_tile.conf.erb

diff --git a/cookbooks/tilecache/templates/default/nginx_tile.conf.erb b/cookbooks/tilecache/templates/default/nginx_tile.conf.erb
index 49cf412ffd8a30df4794b113a69d5e80bc0a0ffa..0b77171e84c7ed73001b51f01be3e1db326ed8ee 100644 (file)
--- a/cookbooks/tilecache/templates/default/nginx_tile.conf.erb
+++ b/cookbooks/tilecache/templates/default/nginx_tile.conf.erb
@@ -2,6 +2,8 @@
 
 upstream tile_cache_backend {
   server 127.0.0.1;
+  server 127.0.0.2;
+  server 127.0.0.3;
 
   # Add the other caches to relieve pressure if local squid failing
   # Balancer: round-robin
@@ -15,7 +17,7 @@ upstream tile_cache_backend {
 <% end -%>
 <% end -%>
 
-  keepalive 1024;
+  keepalive 512;
   keepalive_requests 1024;
 }
 
@@ -71,6 +73,11 @@ map $http_referer $denied_referer {
   'http://osm.org'                 1; # Faked
 }
 
+map $http_referer $osm_referer {
+  default                                 0;     # False
+  '~^https:\/\/www\.openstreetmap\.org\/' 'osm'; # True
+}
+
 # Limit Cache-Control header to only approved User-Agents
 map $http_user_agent $limit_http_cache_control {
   default '';                              # Unset Header
@@ -177,14 +184,29 @@ server {
       proxy_http_version 1.1;
       proxy_set_header Connection '';
 
-      proxy_connect_timeout 5s;
+      proxy_connect_timeout 10s;
 
-      # Preserve host header.
-      proxy_set_header Host $host;
+      # Replace host header.
+      proxy_set_header Host 'tile.openstreetmap.org';
       # Do not pass cookies to backends.
       proxy_set_header Cookie '';
       # Do not pass Accept-Encoding to backends.
       proxy_set_header Accept-Encoding '';
+      # Do not pass Accept to backends.
+      proxy_set_header Accept '';
+      # Do not pass Accept-Language to backends as unused.
+      proxy_set_header Accept-Language '';
+      proxy_set_header Accept-Charset '';
+      # Do not send origin, we allow all.
+      proxy_set_header origin '';
+      # Do not pass invalid headers to backend.
+      proxy_set_header X-Forwarded-Host '';
+      proxy_set_header X-Host '';
+      proxy_set_header Authorization '';
+      proxy_set_header Proxy-Authorization '';
+
+      # Drop partial requests
+      proxy_set_header range '';
 
       # Do not allow setting cookies from backends due to caching.
       proxy_ignore_headers Set-Cookie;
@@ -232,12 +254,20 @@ server {
         return 418;
       }
 
+      # Only allow cache purges if from OpenStreetMap referer
+      if ($osm_referer) {
+        # Allow cache purging headers only from select User-Agents (uses nginx Map)
+        proxy_set_header Cache-Control $limit_http_cache_control;
+        proxy_set_header Pragma $limit_http_pragma;
+      }
+      # nginx has no if else logic
+      if ($osm_referer != 'osm') {
+        proxy_set_header Cache-Control '';
+        proxy_set_header Pragma '';
+      }
+
       # Strip any ?query parameters from urls
       set $args '';
-
-      # Allow cache purging headers only from select User-Agents (uses nginx Map)
-      proxy_set_header Cache-Control $limit_http_cache_control;
-      proxy_set_header Pragma $limit_http_pragma;
     }
 <% end %>
 }