Prevent GV2 operations after becoming unregistered.

app/src/main/java/org/thoughtcrime/securesms/groups/GroupsV2Authorization.java

@@ -57,6 +57,10 @@ public final class GroupsV2Authorization {
     }
   }
 
+  public void clear() {
+    cache.clear();
+  }
+
   private static int currentTimeDays() {
     return (int) TimeUnit.MILLISECONDS.toDays(System.currentTimeMillis());
   }

app/src/main/java/org/thoughtcrime/securesms/util/TextSecurePreferences.java

@@ -15,8 +15,11 @@ import androidx.core.app.NotificationCompat;
 
 import org.greenrobot.eventbus.EventBus;
 import org.signal.core.util.logging.Log;
+import org.signal.zkgroup.profiles.ProfileKey;
 import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.backup.BackupProtos;
+import org.thoughtcrime.securesms.crypto.ProfileKeyUtil;
+import org.thoughtcrime.securesms.database.DatabaseFactory;
 import org.thoughtcrime.securesms.dependencies.ApplicationDependencies;
 import org.thoughtcrime.securesms.jobmanager.impl.SqlCipherMigrationConstraintObserver;
 import org.thoughtcrime.securesms.keyvalue.SettingsValues;
@@ -472,6 +475,10 @@ public class TextSecurePreferences {
     if (previous != value) {
       Recipient.self().live().refresh();
     }
+
+    if (value) {
+      clearLocalCredentials(context);
+    }
   }
 
   public static boolean isUnauthorizedRecieved(Context context) {
@@ -927,6 +934,10 @@ public class TextSecurePreferences {
     if (previous != registered) {
       Recipient.self().live().refresh();
     }
+
+    if (previous && !registered) {
+      clearLocalCredentials(context);
+    }
   }
 
   public static boolean isShowInviteReminders(Context context) {
@@ -1291,6 +1302,16 @@ public class TextSecurePreferences {
     }
   }
 
+  private static void clearLocalCredentials(Context context) {
+    TextSecurePreferences.setPushServerPassword(context, Util.getSecret(18));
+
+    ProfileKey newProfileKey = ProfileKeyUtil.createNew();
+    Recipient  self          = Recipient.self();
+    DatabaseFactory.getRecipientDatabase(context).setProfileKey(self.getId(), newProfileKey);
+
+    ApplicationDependencies.getGroupsV2Authorization().clear();
+  }
+
   // NEVER rename these -- they're persisted by name
   public enum MediaKeyboardMode {
     EMOJI, STICKER, GIF