fix(auth): hostedUI - return success result if federation disabled (#2972)

* return success result for hostedUI sign in w/o Identity Pool

Author: div5yesh

.gitignore

@@ -72,4 +72,4 @@ __pycache__/
 aws-android-sdk-testutils/src/main/res/raw/testconfiguration.json
 
 # AWSCoreRuntime libs
-aws-android-sdk-core/libs
+aws-android-sdk-core/libs

aws-android-sdk-mobile-client/src/main/java/com/amazonaws/mobile/client/AWSMobileClient.java

@@ -46,7 +46,6 @@
 import com.amazonaws.auth.AWSSessionCredentials;
 import com.amazonaws.auth.AnonymousAWSCredentials;
 import com.amazonaws.auth.CognitoCachingCredentialsProvider;
-import com.amazonaws.internal.keyvaluestore.AWSKeyValueStore;
 import com.amazonaws.mobile.auth.core.IdentityManager;
 import com.amazonaws.mobile.auth.core.SignInStateChangeListener;
 import com.amazonaws.mobile.auth.core.StartupAuthResultHandler;
@@ -1045,6 +1044,27 @@ protected UserStateDetails getUserStateDetails(final boolean offlineCheck) {
             }
         }
 
+        if (getSignInMode().equals(SignInMode.HOSTED_UI)) {
+            if (!federationEnabled || cognitoIdentity == null) {
+                // Do nothing, you are signed-in by having the token
+                Log.d(TAG, String.format("_hostedUISignIn without federation: Putting provider and token in store"));
+
+                try {
+                    Tokens tokens = getHostedUITokens();
+                    String idToken = tokens.getIdToken().getTokenString();
+                    details.put(TOKEN_KEY, idToken);
+                    details.put(PROVIDER_KEY, userpoolsLoginKey);
+                    mStore.set(details);
+                    UserState userState = UserState.SIGNED_IN;
+                    final UserStateDetails userStateDetails = new UserStateDetails(userState, details);
+                    return userStateDetails;
+                } catch (Exception e) {
+                    UserState userState = UserState.SIGNED_OUT_USER_POOLS_TOKENS_INVALID;
+                    return new UserStateDetails(userState, null);
+                }
+            }
+        }
+
         // Online state detection
         if (hasUsefulToken && !userpoolsLoginKey.equals(providerKey)) {
             // TODO enhancement: check if token is expired
@@ -2054,6 +2074,12 @@ private void signalTokensNotAvailable(final Exception e) {
         };
     }
 
+    @AnyThread
+    private Tokens getHostedUITokens() throws Exception {
+        final InternalCallback<Tokens> internalCallback = new InternalCallback<Tokens>();
+        return internalCallback.await(() -> _getHostedUITokens(internalCallback));
+    }
+
     private void _getHostedUITokens(final Callback<Tokens> callback) {
         hostedUI = hostedUI.getCurrentUser();
         hostedUI.setAuthHandler(new AuthHandler() {