# DO NOT EDIT - This file is being maintained by Chef

upstream tile_cache_backend {
  server 127.0.0.1:8080 weight=1000 max_fails=32;
  server 127.0.0.2:8080 weight=1000 max_fails=32;

  # Add the tile_siblings caches to relieve pressure if local squid failing
  # Balancer: round-robin
<% server_weight = 1000 -%>
<% Array(@node[:tilecache][:tile_siblings]).each do |cache_peer| -%>
<% @caches.each do |cache| -%>
<% if cache_peer == cache[:fqdn] -%>
<% if cache[:hostname] != node[:hostname] -%>
<% cache.ipaddresses(:family => :inet, :role => :external).sort.each do |address| -%>
  server <%= address %>:80 weight=<%= server_weight %> max_fails=32 backup; # Server <%= cache[:hostname] %>
<% server_weight -= server_weight.div(2) -%>
<% end -%>
<% end -%>
<% end -%>
<% end -%>
<% end -%>

  keepalive 128;
}

# Geo Map of tile caches
geo $tile_cache {
  default "client";
<% @caches.each do |cache| -%>
<% cache.ipaddresses(:family => :inet, :role => :external).sort.each do |address| -%>
  <%= address %> "cache"; # <%= cache[:hostname] %>
<% end -%>
<% end -%>
}

# Rates table based on current cookie value
# map $cookie__osm_totp_token $limit_rate_qos {
#  include /etc/nginx/conf.d/tile_qos_rates.map;
# }

# Set-Cookie table based on current cookie value
# map $cookie__osm_totp_token $cookie_qos_token_set {
#  include /etc/nginx/conf.d/tile_qos_cookies.map;
# }

map $http_user_agent $approved_scraper {
  default                   0; # Not approved
  '~^JOSM\/'                1; # JOSM
  '~^Mozilla\/5\.0\ QGIS\/' 1; # QGIS
}

map $http_user_agent $denied_scraper {
  default                0; # Not denied
  ''                     1; # No User-Agent Set
  '-'                    1;

  # Library defaults
  '~^Python\-urllib\/'   1;
  '~^python\-requests\/' 1;
  '~^node\-fetch\/'      1;
  '~^R$'                 1;
  '~^Java\/'             1;
  '~^tiles$'             1;
  '~^okhttp\/'           1;
  '~^Microsoft-ATL-Native\/' 1;
  '/n software IPWorks HTTP/S Component - www.nsoftware.com' 1;
  '~^Wget\/'             1;
  'java'                 1;

  # Library defaults or fakes
  'Android'              1;
  'kc_android'           1;
  'host'                 1;
  '~^maptestapp'         1;
  'Other'                1;
  'osmdroid'             1;
  '~^tilelive-http'      1;
  '~^Java-http-client'   1;

  # Fakes
  'Mozilla/4.0'          1;
  'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)' 1;

  # Bulk downloaders
  'C# TilesDownloader'   1;
  'MapDownloader'        1;
  '~^staticmaps'         1;

  # Overusage apps
  '~^runtastic'          1;
  '~^Where\ my\ children' 1;
  'nossoonibusjp.android.crosswalk' 1;
  'br.com.concisoti.potybus' 1;
  'com.soft373.taptaxi'  1;
  'com.kradac.ktxcore'   1;
  '~^ru.crowdsystems.topcontrol.knd' 1;
  'pl.itaxi.driver'      1;
  'net.uztaxi.driver'    1;
  'OSMDroid/2.1 (its; rutaxi 3.28.0)' 1;
  'com.helleniccomms.mercedes.driver' 1;
  'ru.taximaster.www'    1;
  'com.arobs.trackgps'   1;
  'com.helleniccomms.asteras.driver' 1;

  # Malware
  'Agent Smith'          1;
  # '~[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}' 1; # Fake UA
}

map $http_referer $denied_referer {
  default                          0; # Not denied
  # Faked sites
  'http://www.openstreetmap.org/'  1;
  'http://www.openstreetmap.org'   1;
  'https://www.openstreetmap.org'  1;
  'http://openstreetmap.org/'      1;
  'http://openstreetmap.org'       1;
  'https://openstreetmap.org'      1;
  'http://www.osm.org/'            1;
  'http://www.osm.org'             1;
  'http://osm.org/'                1;
  'http://osm.org'                 1;
  'http://google.com'              1;
  'http://www.google.com'          1;
  'http://google.com/'             1;
  'http://www.google.com/'         1;
  'https://google.com'             1;
  'https://www.google.com'         1;
  'https://google.com/'            1;
  'https://www.google.com/'        1;
  'http://www.microsoft.com/'      1;

  # Overusing websites
  '~^https?://pmap\.kuku\.lu/'           1;
  '~^https?://[^.]*\.pmap\.kuku\.lu/'    1;
  '~^https?://fastpokemap\.com/'         1;
  '~^https?://[^.]*\.fastpokemap\.com/'  1;
  '~^https?://pkget\.com/'               1;
  '~^https?://[^.]*\.pkget\.com/'        1;
  '~^https?://twpkinfo\.com/'            1;
  '~^https?://[^.]*\.twpkinfo\.com/'     1;
  '~^https?://9db\.jp/'                  1;
  '~^https?://[^.]*\.9db\.jp/'           1;
  '~^https?://clustrmaps\.com/'          1;
  '~^https?://[^.]*\.clustrmaps\.com/'   1;
  '~^https?://geoportal360\.pl/'         1;
  '~^https?://skelbiu\.lt/'              1;
  '~^https?://[^.]*\.skelbiu\.lt/'       1;
  # '~^https?://[^.]*\.wialon.com/'        1; # (hold per 2020-04-10 email)
}

map $http_referer $osm_referer {
  default                                 '';    # False
  '~^https:\/\/www\.openstreetmap\.org\/' 'osm'; # True
}

# Limit Cache-Control header to only approved User-Agents
map $tile_cache$osm_referer$http_user_agent $limit_http_cache_control {
  default '';                             # Unset Header
  '~^clientosmMozilla\/5\.0\ \(X11'       $http_cache_control; # Pass Header
  '~^clientosmMozilla\/5\.0\ \(Windows'   $http_cache_control; # Pass Header
  '~^clientosmMozilla\/5\.0\ \(iPhone'    $http_cache_control; # Pass Header
  '~^clientosmMozilla\/5\.0\ \(Macintosh' $http_cache_control; # Pass Header
  '~^clientosmMozilla\/5\.0\ \(Linux'     $http_cache_control; # Pass Header
}

# Limit Pragma header to only approved User-Agents
map $tile_cache$osm_referer$http_user_agent $limit_http_pragma {
  default '';                             # Unset Header
  '~^clientosmMozilla\/5\.0\ \(X11'       $http_pragma; # Pass Header
  '~^clientosmMozilla\/5\.0\ \(Windows'   $http_pragma; # Pass Header
  '~^clientosmMozilla\/5\.0\ \(iPhone'    $http_pragma; # Pass Header
  '~^clientosmMozilla\/5\.0\ \(Macintosh' $http_pragma; # Pass Header
  '~^clientosmMozilla\/5\.0\ \(Linux'     $http_pragma; # Pass Header
}

# Find Browser User-Agents which are not sending a referer.
# Browsers with no referer could be due to Browser extension or website Referrer-Policy
map $tile_cache$http_referer$scheme$http_user_agent $deny_missing_referer {
  default                                   0; # Not denied
  '~^clienthttpsMozilla\/5\.0\ \(X11'       1;
  '~^clienthttpsMozilla\/5\.0\ \(Windows'   1;
  '~^clienthttpsMozilla\/5\.0\ \(iPhone'    1;
  '~^clienthttpsMozilla\/5\.0\ \(Macintosh' 1;
  '~^clienthttpsMozilla\/5\.0\ \(Linux'     1;
}

server {
    # IPv4
    listen       80 deferred backlog=16384 reuseport fastopen=2048 default_server;
    listen       443 ssl deferred backlog=16384 reuseport fastopen=2048 http2 default_server;
    # IPv6
    listen       [::]:80 deferred backlog=16384 reuseport fastopen=2048 default_server;
    listen       [::]:443 ssl deferred backlog=16384 reuseport fastopen=2048 http2 default_server;
    server_name  localhost;

    proxy_buffers 8 64k;
    proxy_busy_buffers_size 64k;

    ssl_certificate      /etc/ssl/certs/tile.openstreetmap.org.pem;
    ssl_certificate_key  /etc/ssl/private/tile.openstreetmap.org.key;

    # Requests sent within early data are subject to replay attacks.
    # See: http://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_early_data
    ssl_early_data on;

    # Immediately 404 layers we do not support
<% for i in 20..99 do %>
    location /<%= i %>/ {
      return 404;
    }
<% end %>

    # Immediately 404 silly tile requests
    location = /0/0/-1.png {
      return 404;
    }
    location = /1/0/-1.png {
      return 404;
    }
    location = /1/-1/0.png {
      return 404;
    }
    location = /1/-1/1.png {
      return 404;
    }
    location = /1/-1/-1.png {
      return 404;
    }
    location = /1/-1/2.png {
      return 404;
    }
    location = /1/1/-1.png {
      return 404;
    }
    location = /1/2/-1.png {
      return 404;
    }
    location = /2/0/-1.png {
      return 404;
    }
    location = /2/-1/0.png {
      return 404;
    }
    location = /2/-1/1.png {
      return 404;
    }
    location = /2/1/-1.png {
      return 404;
    }
    location = /2/-1/2.png {
      return 404;
    }
    location = /2/-1/3.png {
      return 404;
    }

<% for i in 0..16 do %>
<% if i == 0 -%>
    # Default Fallback Location Handler (lowest)
    location / {
<% elsif -%>
    # Dedicated zoom handler for caching
    location /<%= i %>/ {
<% end %>
      # Only allow GET / HEAD / OPTIONS (CORS) requests
      limit_except GET HEAD OPTIONS {
        deny all;
      }

      proxy_pass http://tile_cache_backend;
      proxy_set_header X-Forwarded-For $remote_addr;
      proxy_http_version 1.1;
      proxy_set_header Connection '';

      proxy_connect_timeout 20s;

      proxy_next_upstream_tries 2;

      # 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;
      proxy_hide_header Set-Cookie;

<% if i != 0 -%>
      # Caching
      proxy_cache "proxy_cache_zone";
      proxy_cache_lock on;
      proxy_cache_valid 200 2d;
      proxy_cache_valid 404 15m;
      # Serve stale cache on errors or if updating
      proxy_cache_use_stale error timeout updating http_404 http_500 http_503 http_504;
      # If in cache as stale, serve stale and update in background
      proxy_cache_background_update on;
      # Workaround nginx async bug which causes stale cache replies to wait for the async backend cache update reply (seen in v1.16.0)
      keepalive_requests 0;
      # Enable revalidation using If-Modified-Since and If-None-Match for stale items
      proxy_cache_revalidate on;
      proxy_cache_min_uses 4;

      add_header x-cache-status "$upstream_cache_status - <%= node[:hostname] %>";
<% else %>
      # Severely rate limit Browser UAs which are not sending a referer.
      # With no referer we do not know who is using tiles
      if ($deny_missing_referer) {
        set $limit_rate 1024;
        add_header x-cache-ratelimit "missing-referer";
      }
<% end -%>

      # Set a QoS cookie if none presented (uses nginx Map)
      # add_header Set-Cookie $cookie_qos_token_set;
<% if node[:ssl][:strict_transport_security] -%>
      # Ensure Strict-Transport-Security header is removed from proxied server responses
      proxy_hide_header Strict-Transport-Security;

      # Enable HSTS
      add_header Strict-Transport-Security "<%= node[:ssl][:strict_transport_security] %>" always;
<% end -%>

      # QoS Traffic Rate see $limit_rate on http://nginx.org/en/docs/http/ngx_http_core_module.html
      # set $limit_rate $limit_rate_qos;

      # Allow Higher Traffic Rate from Approved User-Agents which do not support cookies (uses nginx Map)
      # if ($approved_scraper) {
      #   set $limit_rate 65536;
      # }

      if ($denied_scraper) {
        set $limit_rate 512;
        return 429;
      }
      if ($denied_referer) {
        set $limit_rate 512;
        return 418;
      }

      # 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 %>
}