From 4992bc41941497578d13eb10d3939274722d6bad Mon Sep 17 00:00:00 2001
From: Petr Sloup <slouppetr@gmail.com>
Date: Mon, 23 Jan 2017 12:58:47 +0100
Subject: [PATCH] Fix url instrumentation when serving style to be more robust
 (close #108)

---
 src/serve_style.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/serve_style.js b/src/serve_style.js
index cf0bc86..47ca46b 100644
--- a/src/serve_style.js
+++ b/src/serve_style.js
@@ -60,6 +60,9 @@ module.exports = function(options, repo, params, id, reportTiles, reportFont) {
 
   app.get('/' + id + '.json', function(req, res, next) {
     var fixUrl = function(url, opt_nokey, opt_nostyle) {
+      if (!url || (typeof url !== 'string') || url.indexOf('local://' !== 0)) {
+        return url;
+      }
       var queryParams = [];
       if (!opt_nostyle) {
         queryParams.push('style=' + id);