From 204478540e5042cbbe3d028e0eebe35a8f822d48 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Ch=C5=82odnicki?= <rchl2k@gmail.com>
Date: Tue, 16 Oct 2018 10:27:28 +0200
Subject: [PATCH] (Windows) Fix error on joining paths due to undefined home
 dir

Use more robust way of getting home directory. The code is taken from AWS
library to have parity in logic.
---
 lib/backend.js | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/lib/backend.js b/lib/backend.js
index 27c9032..40347a5 100644
--- a/lib/backend.js
+++ b/lib/backend.js
@@ -3,6 +3,7 @@ const _ = require('lodash')
 const {promisify} = require('es6-promisify')
 const path = require('path')
 const fs = require('fs')
+const os = require('os')
 const errorhandler = require('errorhandler')
 const { extractKey, extractKeysForItems, parseKey } = require('./util')
 const bodyParser = require('body-parser')
@@ -88,6 +89,22 @@ const createAwsConfig = (AWS) => {
   return dynamoConfig
 }
 
+function getHomeDir() {
+  const env = process.env
+  const home = env.HOME || env.USERPROFILE
+      || (env.HOMEPATH ? ((env.HOMEDRIVE || 'C:/') + env.HOMEPATH) : null)
+
+  if (home) {
+    return home
+  }
+
+  if (typeof os.homedir === 'function') {
+    return os.homedir()
+  }
+
+  return null
+}
+
 exports.createServer = (dynamodb, docClient) => {
   const app = express()
   app.set('json spaces', 2)
@@ -95,8 +112,10 @@ exports.createServer = (dynamodb, docClient) => {
   app.set('views', path.resolve(__dirname, '..', 'views'))
 
   if (!dynamodb || !docClient) {
-    if (fs.existsSync(path.join(process.env.HOME, '.aws', 'credentials')) &&
-        fs.existsSync(path.join(process.env.HOME, '.aws', 'config'))) {
+    const homeDir = getHomeDir()
+
+    if (homeDir && fs.existsSync(path.join(homeDir, '.aws', 'credentials')) &&
+        fs.existsSync(path.join(homeDir, '.aws', 'config'))) {
       process.env.AWS_SDK_LOAD_CONFIG = 1
     }