<% require 'uri' %>
# DO NOT EDIT - This file is being maintained by Chef
location ~* "^/layer/<%= @layer %>/(\d+)/(\d+)/(\d+)\.(png|jpg|jpeg)$" {
<% if @uses_tiler -%>
  set $args "";
  rewrite ^/layer/<%= @layer %>/(\d+)/(\d+)/(\d+)\.jpg /mosaicjson/tiles/WebMercatorQuad/$1/$2/$3@1x?url=<%= URI.encode_www_form_component(@source) %>&pixel_selection=first&tile_format=jpeg break;
  rewrite ^/layer/<%= @layer %>/(\d+)/(\d+)/(\d+)\.jpeg /mosaicjson/tiles/WebMercatorQuad/$1/$2/$3@1x?url=<%= URI.encode_www_form_component(@source) %>&pixel_selection=first&tile_format=jpeg break;
  rewrite ^/layer/<%= @layer %>/(\d+)/(\d+)/(\d+)\.png /mosaicjson/tiles/WebMercatorQuad/$1/$2/$3@1x?url=<%= URI.encode_www_form_component(@source) %>&pixel_selection=first&tile_format=png break;
  proxy_pass http://tiler_backend;
  proxy_set_header Host $host;
  proxy_set_header Referer $http_referer;
  proxy_set_header X-Forwarded-For $remote_addr;
  proxy_set_header X-Forwarded-Proto https;
  proxy_set_header X-Forwarded-SSL on;
  proxy_http_version 1.1;
  proxy_set_header Connection "";
  proxy_set_header Cache-Control "";
  proxy_set_header Pragma "";
  proxy_redirect off;
  proxy_cache_key "<%= @layer %><%= @revision %> $request_method $1 $2 $3";
  proxy_cache proxy_cache_zone;
  proxy_cache_valid 200 204 180d;
  proxy_cache_use_stale error timeout updating http_502 http_503 http_504;
  proxy_cache_background_update on;

<% else -%>
  # Override QUERY_STRING to force mapserver query parameters
  fastcgi_param QUERY_STRING "map=/srv/imagery/mapserver/layer-<%= @layer %>.map&mode=tile&layers=<%= @layer %>&tilemode=gmap&tile=$2+$3+$1";
  fastcgi_pass "<%= @site %>_fastcgi";
  include fastcgi_params;
  fastcgi_param REQUEST_METHOD "GET";
  fastcgi_param HTTP_PROXY "";
  fastcgi_read_timeout 60s;

  # Caching
  fastcgi_cache "fastcgi_cache_zone";
  fastcgi_cache_key "<%= @layer %><%= @revision %> $request_method $1 $2 $3";

  # Free connection to socket for other requests
  fastcgi_keep_conn off;

  fastcgi_cache_valid 200 21d;

  # Serve stale cache on errors or if updating
  fastcgi_cache_use_stale error timeout updating http_500 http_503;
  # If in cache as stale, serve stale and update in background
  fastcgi_cache_background_update on;
  # Enable revalidation using If-Modified-Since and If-None-Match for stale items
  fastcgi_cache_revalidate on;

  keepalive_requests 0;

  fastcgi_catch_stderr "Image handling error";

  fastcgi_next_upstream error timeout invalid_header http_500 http_503;
  fastcgi_next_upstream_tries 8;
<% end -%>

  # Do not GZIP tiles
  gzip off;

  # Add HTTP Cache-Control + Expires Headers
  expires 7d;
  add_header Cache-Control "stale-while-revalidate=604800, stale-if-error=604800";
  add_header x-cache-status $upstream_cache_status;

  # Allow CORS requests
  add_header 'Access-Control-Allow-Origin' '*';
}

<% if @root_layer -%>
rewrite "^/(\d+)/(\d+)/(\d+)\.(png|jpg|jpeg)$" "/layer/<%= @layer %>/$1/$2/$3.$4" last;
<% end -%>
<% @url_aliases.each do |url| -%>
rewrite "^<%= url %>/(\d+)/(\d+)/(\d+)\.(png|jpg|jpeg)$" "/layer/<%= @layer %>/$1/$2/$3.$4" last;
<% end -%>