geo.vcl

sub vcl_recv {
#FASTLY recv
  # We don't do other methods
  if (req.method != "GET") {
    return(error);
  }

  # Handle IPv4 or IPv6 provided in url path (nothing extraneous allowed, perform basic matching)
  if (req.url.path ~ "^/([a-f0-9:.]+)$") {
    set client.geo.ip_override = re.group.1;

  # Use X-Forwarded-For if it exists (first IP is client)
  } elseif (req.http.X-Forwarded-For) {
    set client.geo.ip_override = regsub(req.http.X-Forwarded-For, ",.+$", "");
  }

  error 601;
  return(lookup);
}

sub vcl_hash {
#FASTLY hash
  set req.hash += req.http.host;
  set req.hash += req.url;
  set req.hash += client.ip;
  return(hash);
}

sub vcl_hit {
#FASTLY hit
  return(deliver);
}

sub vcl_miss {
#FASTLY miss
  return(fetch);
}

sub vcl_pass {
#FASTLY pass
  return(pass);
}

sub vcl_fetch {
#FASTLY fetch
  return(deliver);
}

sub vcl_error {
  #FASTLY error

  # Assemble JSON output
  synthetic {"{
    "ip": ""} if(client.geo.ip_override, client.geo.ip_override, client.ip) {"",
    "as": {
      "name": ""} json.escape(client.as.name) {"",
      "number": "} json.escape(client.as.number) {"
    },
    "geo": {
      "area_code": "} json.escape(client.geo.area_code) {",
      "city": ""} json.escape( if(client.geo.city.utf8 != "?", client.geo.city.utf8, "") ) {"",
      "continent_code": ""} json.escape( if(client.geo.continent_code != "?", client.geo.continent_code, "") ) {"",
      "country_code": ""} json.escape( if(client.geo.country_code != "?", client.geo.country_code, "") ) {"",
      "country_code3": ""} json.escape( if(client.geo.country_code3 != "?", client.geo.country_code3, "") ) {"",
      "country_name": ""} json.escape( if(client.geo.country_name.utf8 != "?", client.geo.country_name.utf8, "") ) {"",
      "latitude": "} json.escape(client.geo.latitude) {",
      "longitude": "} json.escape(client.geo.longitude) {",
      "metro_code": "} json.escape(client.geo.metro_code) {",
      "postal_code": ""} json.escape( if(client.geo.postal_code != "?", client.geo.postal_code, "") ) {"",
      "region": ""} json.escape( if(client.geo.region.utf8 != "?", client.geo.region.utf8, "") ) {""
    },
    "timezone": {
      "gmt_offset": "} json.escape(client.geo.gmt_offset) {",
      "utc_offset": "} json.escape(client.geo.utc_offset) {"
    },
    "client": {
      "conn_speed": ""} json.escape( if(client.geo.conn_speed != "?", client.geo.conn_speed, "") ) {"",
      "conn_type": ""} json.escape( if(client.geo.conn_type != "?", client.geo.conn_type, "") ) {"",
      "proxy_description": ""} json.escape( if(client.geo.proxy_description != "?", client.geo.proxy_description, "") ) {"",
      "proxy_type": ""} json.escape( if(client.geo.proxy_type != "?", client.geo.proxy_type, "") ) {""
    }
}"};

  set obj.status = 200;
  set obj.response = "OK";
  set obj.http.Content-Type = "application/json";

  return (deliver);
}

sub vcl_deliver {
#FASTLY deliver
  return(deliver);
}

sub vcl_log {
#FASTLY log
}