Added SSO flows and functionality (#1047)

* SSO login flow for pre-existing user and no 2FA

* 2FA progress

* 2FA support

* Added SSO flows and functionality

* Handle webauthenticator cancellation gracefully

* updates & bugfixes

* Added state validation to web auth response handling

* SSO auth, account registration, and environment settings support for iOS extensions

* Added SSO prevalidation to auth process

* prevalidation now hitting identity service base url

* additional error handling

* Requested changes

* fixed case

src/Android/Android.csproj

@@ -78,7 +78,7 @@
       <Version>1.8.6.7</Version>
     </PackageReference>
     <PackageReference Include="Xamarin.Essentials">
-      <Version>1.5.3.1</Version>
+      <Version>1.5.3.2</Version>
     </PackageReference>
     <PackageReference Include="Xamarin.Firebase.Messaging">
       <Version>71.1740.0</Version>
@@ -142,6 +142,7 @@
     <Compile Include="Tiles\MyVaultTileService.cs" />
     <Compile Include="Utilities\AndroidHelpers.cs" />
     <Compile Include="Utilities\AppCenterHelper.cs" />
+    <Compile Include="WebAuthCallbackActivity.cs" />
   </ItemGroup>
   <ItemGroup>
     <AndroidAsset Include="Assets\FontAwesome.ttf" />

src/Android/MainActivity.cs

@@ -144,6 +144,7 @@ namespace Bit.Droid
         protected override void OnResume()
         {
             base.OnResume();
+            Xamarin.Essentials.Platform.OnResume();
             if (_deviceActionService.SupportsNfc())
             {
                 try

src/Android/WebAuthCallbackActivity.cs

@@ -0,0 +1,11 @@
+using Android.App;
+using Android.Content.PM;
+
+namespace Bit.Droid
+{
+    [Activity(NoHistory = true, LaunchMode = LaunchMode.SingleTop)]
+    [IntentFilter(new[] { Android.Content.Intent.ActionView },
+        Categories = new[] { Android.Content.Intent.CategoryDefault, Android.Content.Intent.CategoryBrowsable },
+        DataScheme = "bitwarden")]
+    public class WebAuthCallbackActivity : Xamarin.Essentials.WebAuthenticatorCallbackActivity { }
+}