Install: Use npmconf to get proxy config

package.json

@@ -51,6 +51,7 @@
     "mkdirp": "^0.5.0",
     "mocha": "^2.0.1",
     "nan": "^1.3.0",
+    "npmconf": "^2.1.1",
     "object-assign": "^2.0.0",
     "replace-ext": "0.0.1",
     "request": "^2.48.0",

scripts/install.js

@@ -9,13 +9,14 @@ var fs = require('fs'),
  *
  * @param {String} url
  * @param {String} dest
- * @param {function} cb
+ * @param {Function} cb
  * @api private
  */
 
 function download(url, dest, cb) {
   var file = fs.createWriteStream(dest);
-  var options = { proxy: getProxy(), rejectUnauthorized: false };
+
+  applyProxy({ rejectUnauthorized: false }, function(options) {
     var returnError = function(err) {
       fs.unlink(dest);
       cb(typeof err.message === 'string' ? err.message : err);
@@ -34,45 +35,38 @@ function download(url, dest, cb) {
 
     req.end();
     req.on('error', returnError);
+  });
 }
 
 /**
- * Get proxy settings
+ * Get applyProxy settings
  *
+ * @param {Object} options
+ * @param {Function} cb
  * @api private
  */
 
-function getProxy() {
-  var result = ['https-proxy', 'proxy', 'http-proxy'].filter(function(config) {
-    var proxy = exec('npm config get ' + config, {silent: true});
+function applyProxy(options, cb) {
+  require('npmconf').load({}, function (er, conf) {
+    var getProxyFromEnv = true;
+    ['https-proxy', 'proxy', 'http-proxy'].forEach(function(setting) {
+      var proxyUrl = conf.get(setting);
 
-    return proxy.code === 0 && validateProxyUrl(proxy.output.trim());
-  })[0];
-
-  if (result) {
-    return result;
+      if(proxyUrl && proxyUrl === require('url').parse(proxyUrl)) {
+        options.proxy = proxyUrl;
+        getProxyFromEnv = false;
+        cb(options);
+        return;
       }
+    });
 
+    if(getProxyFromEnv) {
       var env = process.env;
-  return env.HTTPS_PROXY || env.https_proxy || env.HTTP_PROXY || env.http_proxy;
-}
-
-/**
- * Validates Proxy URL
- *
- * @param {String} url
- * @api private
- */
+      options.proxy = env.HTTPS_PROXY || env.https_proxy || env.HTTP_PROXY || env.http_proxy;
 
-function validateProxyUrl(url) {
-  if (/\n/.test(url)) {
-    url = url.replace(/\r?\n+/, '\n').split('\n');
-    url = url[url.length - 3].trim(); // get the second last element.
+      cb(options);
     }
-
-  return url !== 'null' &&
-         url !== 'undefined' &&
-         url === require('url').parse(url);
+  });
 }
 
 /**