gracefully handle invalidated auth tokens

app/src/main/java/io/lbry/browser/FirstRunActivity.java

@@ -15,6 +15,7 @@ import androidx.appcompat.app.AppCompatActivity;
 import androidx.core.text.HtmlCompat;
 import androidx.preference.PreferenceManager;
 
+import io.lbry.browser.exceptions.AuthTokenInvalidatedException;
 import io.lbry.browser.utils.Helper;
 import io.lbry.browser.utils.Lbry;
 import io.lbry.browser.utils.LbryAnalytics;
@@ -139,7 +140,11 @@ public class FirstRunActivity extends AppCompatActivity {
             this.context = context;
         }
         protected Void doInBackground(Void... params) {
-            Lbryio.authenticate(context);
+            try {
+                Lbryio.authenticate(context);
+            } catch (AuthTokenInvalidatedException ex) {
+                // pass
+            }
             return null;
         }
     }

app/src/main/java/io/lbry/browser/MainActivity.java

@@ -117,6 +117,7 @@ import io.lbry.browser.adapter.NavigationMenuAdapter;
 import io.lbry.browser.adapter.UrlSuggestionListAdapter;
 import io.lbry.browser.data.DatabaseHelper;
 import io.lbry.browser.dialog.ContentScopeDialogFragment;
+import io.lbry.browser.exceptions.AuthTokenInvalidatedException;
 import io.lbry.browser.exceptions.LbryUriException;
 import io.lbry.browser.listener.CameraPermissionListener;
 import io.lbry.browser.listener.DownloadActionListener;
@@ -2384,7 +2385,13 @@ public class MainActivity extends AppCompatActivity implements SdkStatusListener
                     }
                     startupStages.put(STARTUP_STAGE_EXCHANGE_RATE_LOADED, true);
 
-                    Lbryio.authenticate(context);
+                    try {
+                        Lbryio.authenticate(context);
+                    } catch (AuthTokenInvalidatedException ex) {
+                        // if this happens, attempt to authenticate again, so that we can obtain a new auth token
+                        // this will also result in the user having to sign in again
+                        Lbryio.authenticate(context);
+                    }
                     if (Lbryio.currentUser == null) {
                         throw new Exception("Did not retrieve authenticated user.");
                     }

app/src/main/java/io/lbry/browser/VerificationActivity.java

@@ -167,7 +167,7 @@ public class VerificationActivity extends FragmentActivity implements SignInList
 
             // only sign in required, don't do anything else
             showLoading();
-            FetchCurrentUserTask task = new FetchCurrentUserTask(new FetchCurrentUserTask.FetchUserTaskHandler() {
+            FetchCurrentUserTask task = new FetchCurrentUserTask(this, new FetchCurrentUserTask.FetchUserTaskHandler() {
                 @Override
                 public void onSuccess(User user) {
                     Lbryio.currentUser = user;
@@ -185,7 +185,7 @@ public class VerificationActivity extends FragmentActivity implements SignInList
         } else {
             // change pager view depending on flow
             showLoading();
-            FetchCurrentUserTask task = new FetchCurrentUserTask(new FetchCurrentUserTask.FetchUserTaskHandler() {
+            FetchCurrentUserTask task = new FetchCurrentUserTask(this, new FetchCurrentUserTask.FetchUserTaskHandler() {
                 @Override
                 public void onSuccess(User user) {
                     hideLoading();
@@ -229,7 +229,7 @@ public class VerificationActivity extends FragmentActivity implements SignInList
     @Override
     public void onPhoneVerified() {
         showLoading();
-        FetchCurrentUserTask task = new FetchCurrentUserTask(new FetchCurrentUserTask.FetchUserTaskHandler() {
+        FetchCurrentUserTask task = new FetchCurrentUserTask(this, new FetchCurrentUserTask.FetchUserTaskHandler() {
             @Override
             public void onSuccess(User user) {
                 Lbryio.currentUser = user;

app/src/main/java/io/lbry/browser/exceptions/AuthTokenInvalidatedException.java

@@ -0,0 +1,4 @@
+package io.lbry.browser.exceptions;
+
+public class AuthTokenInvalidatedException extends Exception {
+}

app/src/main/java/io/lbry/browser/tasks/lbryinc/FetchCurrentUserTask.java

@@ -1,20 +1,23 @@
 package io.lbry.browser.tasks.lbryinc;
 
+import android.content.Context;
 import android.os.AsyncTask;
 
 import io.lbry.browser.model.lbryinc.User;
 import io.lbry.browser.utils.Lbryio;
 
 public class FetchCurrentUserTask extends AsyncTask<Void, Void, User> {
+    private Context context;
     private Exception error;
     private FetchUserTaskHandler handler;
 
-    public FetchCurrentUserTask(FetchUserTaskHandler handler) {
+    public FetchCurrentUserTask(Context context, FetchUserTaskHandler handler) {
+        this.context = context;
         this.handler = handler;
     }
     protected User doInBackground(Void... params) {
         try {
-            return Lbryio.fetchCurrentUser(null);
+            return Lbryio.fetchCurrentUser(context);
         } catch (Exception ex) {
             error = ex;
             return null;

app/src/main/java/io/lbry/browser/tasks/verification/CheckUserEmailVerifiedTask.java

@@ -1,20 +1,28 @@
 package io.lbry.browser.tasks.verification;
 
+import android.content.Context;
 import android.os.AsyncTask;
 
+import io.lbry.browser.exceptions.AuthTokenInvalidatedException;
 import io.lbry.browser.model.lbryinc.User;
 import io.lbry.browser.utils.Lbryio;
 
 public class CheckUserEmailVerifiedTask extends AsyncTask<Void, Void, Boolean> {
+    private Context context;
     private CheckUserEmailVerifiedHandler handler;
 
-    public CheckUserEmailVerifiedTask(CheckUserEmailVerifiedHandler handler) {
+    public CheckUserEmailVerifiedTask(Context context, CheckUserEmailVerifiedHandler handler) {
+        this.context = context;
         this.handler = handler;
     }
 
     protected Boolean doInBackground(Void... params) {
-        User user = Lbryio.fetchCurrentUser(null);
+        try {
-        return user != null && user.isHasVerifiedEmail();
+            User user = Lbryio.fetchCurrentUser(context);
+            return user != null && user.isHasVerifiedEmail();
+        } catch (AuthTokenInvalidatedException ex) {
+            return  false;
+        }
     }
 
     protected void onPostExecute(Boolean result) {

app/src/main/java/io/lbry/browser/ui/verification/EmailVerificationFragment.java

@@ -165,7 +165,8 @@ public class EmailVerificationFragment extends Fragment {
     }
 
     private void checkEmailVerified() {
-        CheckUserEmailVerifiedTask task = new CheckUserEmailVerifiedTask(new CheckUserEmailVerifiedTask.CheckUserEmailVerifiedHandler() {
+        Context context = getContext();
+        CheckUserEmailVerifiedTask task = new CheckUserEmailVerifiedTask(context, new CheckUserEmailVerifiedTask.CheckUserEmailVerifiedHandler() {
             @Override
             public void onUserEmailVerified() {
                 if (listener != null) {

app/src/main/java/io/lbry/browser/utils/Lbryio.java

@@ -2,11 +2,14 @@ package io.lbry.browser.utils;
 
 import android.content.Context;
 import android.content.Intent;
+import android.content.SharedPreferences;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.net.Uri;
 import android.util.Log;
 
+import androidx.preference.PreferenceManager;
+
 import com.google.gson.FieldNamingPolicy;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
@@ -27,6 +30,7 @@ import java.util.concurrent.TimeUnit;
 
 import io.lbry.browser.BuildConfig;
 import io.lbry.browser.MainActivity;
+import io.lbry.browser.exceptions.AuthTokenInvalidatedException;
 import io.lbry.browser.exceptions.LbryioRequestException;
 import io.lbry.browser.exceptions.LbryioResponseException;
 import io.lbry.browser.model.Claim;
@@ -200,7 +204,7 @@ public final class Lbryio {
         }
     }
 
-    public static User fetchCurrentUser(Context context) {
+    public static User fetchCurrentUser(Context context) throws AuthTokenInvalidatedException {
         try {
             Response response = Lbryio.call("user", "me", context);
             JSONObject object = (JSONObject) parseResponse(response);
@@ -210,6 +214,22 @@ public final class Lbryio {
             return user;
         } catch (LbryioRequestException | LbryioResponseException | ClassCastException | IllegalStateException ex) {
             LbryAnalytics.logError(String.format("/user/me failed: %s", ex.getMessage()), ex.getClass().getName());
+
+            if (ex instanceof LbryioResponseException) {
+                LbryioResponseException error = (LbryioResponseException) ex;
+                if (error.getStatusCode() == 403) {
+                    // auth token invalidated
+                    AUTH_TOKEN = null;
+                    // remove the cached auth token
+                    if (context != null) {
+                        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);
+                        sp.edit().remove(MainActivity.PREFERENCE_KEY_AUTH_TOKEN).apply();
+                    }
+
+                    throw new AuthTokenInvalidatedException();
+                }
+            }
+
             android.util.Log.e(TAG, "Could not retrieve the current user", ex);
             return null;
         }
@@ -256,7 +276,7 @@ public final class Lbryio {
         return currentUser != null && currentUser.isHasVerifiedEmail();
     }
 
-    public static void authenticate(Context context) {
+    public static void authenticate(Context context) throws AuthTokenInvalidatedException {
         User user = fetchCurrentUser(context);
         if (user != null) {
             currentUser = user;