From 50bd4409f51c2d04e360c232415e6a5e80bfd2f1 Mon Sep 17 00:00:00 2001
From: Jannis R <mail@jannisr.de>
Date: Wed, 8 Aug 2018 18:46:20 +0200
Subject: [PATCH] better User-Agent randomization :bug:

---
 .gitignore     | 2 ++
 lib/request.js | 8 +++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index d6fb75eb..44af817e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,5 @@ Thumbs.db
 .nvm-version
 node_modules
 npm-debug.log
+
+/id.json
diff --git a/lib/request.js b/lib/request.js
index b17baf9c..681626c6 100644
--- a/lib/request.js
+++ b/lib/request.js
@@ -9,10 +9,16 @@ const {stringify} = require('query-string')
 const Promise = require('pinkie-promise')
 const {fetch} = require('fetch-ponyfill')({Promise})
 
+const userAgent = 'https://github.com/public-transport/hafas-client'
 const clientId = Math.random().toString(16).substr(2, 10)
 
 const md5 = input => createHash('md5').update(input).digest()
 
+const randomizeUserAgent = () => {
+	const i = Math.round(Math.random() * userAgent.length)
+	return userAgent.slice(0, i) + clientId + userAgent.slice(i)
+}
+
 const request = (profile, data) => {
 	const body = profile.transformReqBody({lang: 'en', svcReqL: [data]})
 	const req = profile.transformReq({
@@ -23,7 +29,7 @@ const request = (profile, data) => {
 			'Content-Type': 'application/json',
 			'Accept-Encoding': 'gzip, deflate',
 			'Accept': 'application/json',
-			'user-agent': clientId + ' https://github.com/public-transport/hafas-client'
+			'user-agent': randomizeUserAgent()
 		},
 		query: {}
 	})