clone options before any change to avoid issues

Author: Florian Traverse

lib/index.js

@@ -1,11 +1,17 @@
 var qs = require('qs');
 var url = require('url');
 var crypto = require('crypto');
-var debug = require('debug')("qs:signature")
+var clone = require('clone');
+var debug = require('debug')("qs:signature");
+
+exports.stringify = function(opts, urlOrPath) {
+  if (!opts || !opts.signature || !urlOrPath)
+    return qs.stringify(opts);
+
+  debug("signature base64 key", opts.signature);
+  //in order to avoid messing with the key stored by reference, extend:
+  var options = clone(opts);
 
-exports.stringify = function(options, urlOrPath) {
-  if (!options || !options.signature || !urlOrPath)
-    return qs.stringify(options);
   debug("original url/path", urlOrPath);
 
   var usablePrivateKey = new Buffer(websafe(options.signature), 'base64');

package.json

@@ -18,6 +18,7 @@
   "author": "Florian Traverse",
   "license": "MIT",
   "dependencies": {
+    "clone": "^0.1.18",
     "debug": "^2.1.0",
     "qs": "^2.3.3"
   },