use Edge UA for google sign-in (#1119)

main/UASwitcher.js

@@ -2,11 +2,36 @@
 see https://github.com/minbrowser/min/issues/657 for more information */
 
 let defaultUserAgent = app.userAgentFallback
+let hasCustomUserAgent = false
 let newUserAgent
 
 if (settings.get('customUserAgent')) {
   newUserAgent = settings.get('customUserAgent')
+  hasCustomUserAgent = true
 } else {
   newUserAgent = defaultUserAgent.replace(/Min\/\S+\s/, '').replace(/Electron\/\S+\s/, '')
 }
 app.userAgentFallback = newUserAgent
+
+/*
+Google blocks signin in some cases unless a custom UA is used
+see https://github.com/minbrowser/min/issues/868
+*/
+function enableGoogleUASwitcher (ses) {
+  ses.webRequest.onBeforeSendHeaders((details, callback) => {
+    if (!hasCustomUserAgent && details.url.includes('accounts.google.com')) {
+      const url = new URL(details.url)
+
+      if (url.hostname === 'accounts.google.com') {
+        details.requestHeaders['User-Agent'] = newUserAgent + ' Edg/' + process.versions.chrome
+      }
+    }
+    callback({ cancel: false, requestHeaders: details.requestHeaders })
+  })
+}
+
+app.once('ready', function () {
+  enableGoogleUASwitcher(session.defaultSession)
+})
+
+app.on('session-created', enableGoogleUASwitcher)