From 7415d3cee51ff8bd63e5aac782b90f6385a776d8 Mon Sep 17 00:00:00 2001
From: Feross Aboukhadijeh <feross@feross.org>
Date: Fri, 16 Sep 2016 19:24:21 -0700
Subject: [PATCH] Detect system architecture; send in update/telemetry

Detect the actual operating system CPU architecture. This is different
than `process.arch` which returns the architecture the binary was
compiled for.

This is just good info to have in the telemetry, but we're also sending
it in the update check so that eventually we can upgrade Windows 32-bit
apps to 64-bit, like Slack does.

Context:
https://github.com/feross/webtorrent-desktop/issues/873#issuecomment-247
722023
---
 src/config.js                 | 31 +++++++++++++++++++++++++++++++
 src/main/updater.js           |  3 ++-
 src/renderer/lib/telemetry.js |  1 +
 3 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/src/config.js b/src/config.js
index 4a342194..19bd1ada 100644
--- a/src/config.js
+++ b/src/config.js
@@ -81,6 +81,8 @@ module.exports = {
   IS_PRODUCTION: IS_PRODUCTION,
   IS_TEST: IS_TEST,
 
+  OS_SYSARCH: is64BitOperatingSystem() ? 'x64' : 'ia32',
+
   POSTER_PATH: path.join(getConfigPath(), 'Posters'),
   ROOT_PATH: path.join(__dirname, '..'),
   STATIC_PATH: path.join(__dirname, '..', 'static'),
@@ -149,3 +151,32 @@ function isProduction () {
     return !/\/electron$/.test(process.execPath)
   }
 }
+
+/**
+ * Returns the operating system's CPU architecture. This is different than
+ * `process.arch` which returns the architecture the binary was compiled for.
+ *
+ * On Windows, the most reliable way to detect a 64-bit OS from within a 32-bit
+ * app is based on the presence of a WOW64 file: %SystemRoot%\SysNative.
+ *
+ * Background: https://twitter.com/feross/status/776949077208510464
+ */
+function is64BitOperatingSystem () {
+  // This is a 64-bit binary, so the OS clearly supports 64-bit apps
+  if (process.arch === 'x64') return true
+
+  let useEnv = false
+  try {
+    useEnv = !!(process.env.SYSTEMROOT && fs.statSync(process.env.SYSTEMROOT))
+  } catch (err) {}
+
+  let sysRoot = useEnv ? process.env.SYSTEMROOT : 'C:\\Windows'
+
+  // If %SystemRoot%\SysNative exists, we are in a WOW64 FS Redirected application.
+  let isWOW64 = false
+  try {
+    isWOW64 = !!fs.statSync(path.join(sysRoot, 'sysnative'))
+  } catch (err) {}
+
+  return isWOW64
+}
diff --git a/src/main/updater.js b/src/main/updater.js
index eab07a4c..b6d60966 100644
--- a/src/main/updater.js
+++ b/src/main/updater.js
@@ -11,7 +11,8 @@ const windows = require('./windows')
 
 const AUTO_UPDATE_URL = config.AUTO_UPDATE_URL +
   '?version=' + config.APP_VERSION +
-  '&platform=' + process.platform
+  '&platform=' + process.platform +
+  '&sysarch=' + config.OS_SYSARCH
 
 function init () {
   if (process.platform === 'linux') {
diff --git a/src/renderer/lib/telemetry.js b/src/renderer/lib/telemetry.js
index 3f720e8f..758b55a4 100644
--- a/src/renderer/lib/telemetry.js
+++ b/src/renderer/lib/telemetry.js
@@ -105,6 +105,7 @@ function getSystemInfo () {
     osPlatform: process.platform,
     osRelease: os.type() + ' ' + os.release(),
     architecture: os.arch(),
+    systemArchitecture: config.OS_SYSARCH,
     totalMemoryMB: roundPow2(os.totalmem() / (1 << 20)),
     numCores: os.cpus().length
   }