[connectors/http] prevent errors caused by multi-byte characters in paths (#756)

* [connectors/http] catch errors caused by multi-byte paths

* Check url validity before to run the request

* Updated test

(cherry picked from commit 0d07233)

Author: Spencer

src/lib/connectors/http.js

@@ -19,6 +19,7 @@ var qs = require('querystring');
 var AgentKeepAlive = require('agentkeepalive');
 var ConnectionAbstract = require('../connection');
 var zlib = require('zlib');
+var INVALID_PATH_REGEX = /[^\u0021-\u00ff]/
 
 /**
  * Connector used to talk to an elasticsearch node via HTTP
@@ -166,6 +167,11 @@ HttpConnector.prototype.request = function (params, cb) {
     }
   }, this);
 
+  if (INVALID_PATH_REGEX.test(reqParams.path) === true) {
+    cb(new TypeError('ERR_UNESCAPED_CHARACTERS: ' + reqParams.path))
+    return function () {}
+  }
+
   request = this.hand.request(reqParams, function (_incoming) {
     incoming = _incoming;
     status = incoming.statusCode;

test/unit/specs/http_connector.js

@@ -230,6 +230,17 @@ describe('Http Connector', function () {
         done();
       });
     });
+
+    it('calls back with error when http.request throws an error', function (done) {
+      var con = new HttpConnection(new Host('http://google.com/thisisinvalid\uffe2'));
+
+      stub(con.log, 'error');
+
+      con.request({}, function (err) {
+        expect(err.message).to.eql('ERR_UNESCAPED_CHARACTERS: /thisisinvalid\uffe2');
+        done();
+      });
+    });
   });
 
   describe('#request with incomming message error', function () {