Get around Google limitation of SSO through WebView by modifying the WebView user agent

Author: bmarty

CHANGES.rst

@@ -12,7 +12,7 @@ Improvements:
  -
 
 Other changes:
- -
+ - Get around Google limitation of SSO through WebView by modifying the WebView user agent
 
 Bugfix:
  -

vector/src/main/java/im/vector/activity/FallbackAuthenticationActivity.kt

@@ -65,6 +65,9 @@ class FallbackAuthenticationActivity : VectorAppCompatActivity() {
         mMode = intent.getIntExtra(EXTRA_IN_MODE, MODE_LOGIN)
 
         mWebView.settings.javaScriptEnabled = true
+        // Due to https://developers.googleblog.com/2016/08/modernizing-oauth-interactions-in-native-apps.html, we hack
+        // the user agent to bypass the limitation of Google, as a quick fix (a proper solution will be to use the SSO SDK)
+        mWebView.settings.userAgentString = "Mozilla/5.0 Google"
 
         mHomeServerUrl = getString(R.string.default_hs_server_url)