Sketch out the backup restore view.

Signal/src/AppDelegate.m

@@ -142,6 +142,11 @@ static NSTimeInterval launchStartedAt;
     return Environment.shared.windowManager;
 }
 
+- (OWSBackup *)backup
+{
+    return AppEnvironment.shared.backup;
+}
+
 #pragma mark -
 
 - (void)applicationDidEnterBackground:(UIApplication *)application {
@@ -547,6 +552,10 @@ static NSTimeInterval launchStartedAt;
         OWSFailDebug(@"app launch failed");
         return NO;
     }
+    if (self.backup.hasPendingRestoreDecision) {
+        OWSLogInfo(@"Ignoring URL; pending restore decision.");
+        return NO;
+    }
 
     if (!AppReadiness.isAppReady) {
         OWSLogWarn(@"Ignoring openURL: app not ready.");
@@ -744,6 +753,12 @@ static NSTimeInterval launchStartedAt;
 
     if (self.didAppLaunchFail) {
         OWSFailDebug(@"app launch failed");
+        completionHandler(NO);
+        return;
+    }
+    if (self.backup.hasPendingRestoreDecision) {
+        OWSLogInfo(@"Ignoring shortcut action; pending restore decision.");
+        completionHandler(NO);
         return;
     }
 
@@ -795,6 +810,10 @@ static NSTimeInterval launchStartedAt;
         OWSFailDebug(@"app launch failed");
         return NO;
     }
+    if (self.backup.hasPendingRestoreDecision) {
+        OWSLogInfo(@"Ignoring user activity; pending restore decision.");
+        return NO;
+    }
 
     if ([userActivity.activityType isEqualToString:@"INStartVideoCallIntent"]) {
         if (!SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(10, 0)) {
@@ -950,6 +969,10 @@ static NSTimeInterval launchStartedAt;
         OWSFailDebug(@"app launch failed");
         return;
     }
+    if (self.backup.hasPendingRestoreDecision) {
+        OWSLogInfo(@"Ignoring remote notification; pending restore decision.");
+        return;
+    }
 
     // It is safe to continue even if the app isn't ready.
     [[PushManager sharedManager] application:application didReceiveRemoteNotification:userInfo];
@@ -964,6 +987,10 @@ static NSTimeInterval launchStartedAt;
         OWSFailDebug(@"app launch failed");
         return;
     }
+    if (self.backup.hasPendingRestoreDecision) {
+        OWSLogInfo(@"Ignoring remote notification; pending restore decision.");
+        return;
+    }
 
     // It is safe to continue even if the app isn't ready.
     [[PushManager sharedManager] application:application
@@ -978,6 +1005,10 @@ static NSTimeInterval launchStartedAt;
         OWSFailDebug(@"app launch failed");
         return;
     }
+    if (self.backup.hasPendingRestoreDecision) {
+        OWSLogInfo(@"Ignoring local notification; pending restore decision.");
+        return;
+    }
 
     OWSLogInfo(@"%@", notification);
     [AppReadiness runNowOrWhenAppDidBecomeReady:^{
@@ -994,6 +1025,12 @@ static NSTimeInterval launchStartedAt;
 
     if (self.didAppLaunchFail) {
         OWSFailDebug(@"app launch failed");
+        completionHandler();
+        return;
+    }
+    if (self.backup.hasPendingRestoreDecision) {
+        OWSLogInfo(@"Ignoring action; pending restore decision.");
+        completionHandler();
         return;
     }
 
@@ -1023,6 +1060,12 @@ static NSTimeInterval launchStartedAt;
 
     if (self.didAppLaunchFail) {
         OWSFailDebug(@"app launch failed");
+        completionHandler();
+        return;
+    }
+    if (self.backup.hasPendingRestoreDecision) {
+        OWSLogInfo(@"Ignoring action; pending restore decision.");
+        completionHandler();
         return;
     }
 
@@ -1220,18 +1263,21 @@ static NSTimeInterval launchStartedAt;
     NSTimeInterval startupDuration = CACurrentMediaTime() - launchStartedAt;
     OWSLogInfo(@"Presenting app %.2f seconds after launch started.", startupDuration);
 
+    UIViewController *rootViewController;
     if ([self.tsAccountManager isRegistered]) {
-        HomeViewController *homeView = [HomeViewController new];
-        SignalsNavigationController *navigationController =
-            [[SignalsNavigationController alloc] initWithRootViewController:homeView];
-        self.window.rootViewController = navigationController;
+        if (self.backup.hasPendingRestoreDecision) {
+            rootViewController = [BackupRestoreViewController new];
+        } else {
+            rootViewController = [HomeViewController new];
+        }
     } else {
-        RegistrationViewController *viewController = [RegistrationViewController new];
-        OWSNavigationController *navigationController =
-            [[OWSNavigationController alloc] initWithRootViewController:viewController];
-        navigationController.navigationBarHidden = YES;
-        self.window.rootViewController = navigationController;
+        rootViewController = [RegistrationViewController new];
     }
+    OWSAssertDebug(rootViewController);
+    OWSNavigationController *navigationController =
+        [[OWSNavigationController alloc] initWithRootViewController:rootViewController];
+    navigationController.navigationBarHidden = YES;
+    self.window.rootViewController = navigationController;
 
     [AppUpdateNag.sharedInstance showAppUpgradeNagIfNecessary];
 }

Signal/src/ViewControllers/ProfileViewController.m

@@ -426,9 +426,6 @@ NSString *const kProfileView_LastPresentedDate = @"kProfileView_LastPresentedDat
 {
     OWSLogVerbose(@"");
 
-    [self checkCanImportBackup];
-    return;
-
     // Dismiss this view.
     switch (self.profileViewMode) {
         case ProfileViewMode_AppSettings:

Signal/src/ViewControllers/Registration/BackupRestoreViewController.swift

@@ -115,18 +115,27 @@ public class BackupRestoreViewController: OWSTableViewController {
 
         backup.setHasPendingRestoreDecision(false)
 
-        self.dismiss(animated: true)
+        dismiss(animated: true)
     }
 
     @objc
     private func startImport() {
         Logger.info("")
 
+        hasBegunImport = true
+
         backup.tryToImport()
     }
 
     private func showHomeView() {
-        SignalApp.shared().showHomeView()
+        let isModal = navigationController?.presentingViewController != nil
+        if isModal {
+            dismiss(animated: true, completion: {
+                SignalApp.shared().showHomeView()
+            })
+        } else {
+            SignalApp.shared().showHomeView()
+        }
     }
 
     // MARK: - Notifications
@@ -134,7 +143,12 @@ public class BackupRestoreViewController: OWSTableViewController {
     @objc func backupStateDidChange() {
         AssertIsOnMainThread()
 
+        Logger.verbose("backup.backupImportState: \(NSStringForBackupImportState(backup.backupImportState))")
+        Logger.flush()
+
         if backup.backupImportState == .succeeded {
+            backup.setHasPendingRestoreDecision(false)
+
             showHomeView()
         } else {
             updateTableContents()

Signal/src/util/Backup/OWSBackup.m

@@ -259,6 +259,11 @@ NSString *NSStringForBackupImportState(OWSBackupState state)
     if (!self.isBackupEnabled) {
         return NO;
     }
+    if (self.hasPendingRestoreDecision) {
+        // Don't backup while awaiting user decision about
+        // whether to import previous backup.
+        return NO;
+    }
     if (UIApplication.sharedApplication.applicationState != UIApplicationStateActive) {
         // Don't start backups when app is in the background.
         return NO;

Signal/translations/en.lproj/Localizable.strings

@@ -234,13 +234,13 @@
 "BACKUP_RESTORE_DECISION_TITLE" = "Backup Available";
 
 /* Label for the backup restore description. */
-"BACKUP_RESTORE_DESCRIPTION" = "BACKUP_RESTORE_DESCRIPTION";
+"BACKUP_RESTORE_DESCRIPTION" = "Restoring Backup";
 
 /* Label for the backup restore progress. */
-"BACKUP_RESTORE_PROGRESS" = "BACKUP_RESTORE_PROGRESS";
+"BACKUP_RESTORE_PROGRESS" = "Progress";
 
 /* Label for the backup restore status. */
-"BACKUP_RESTORE_STATUS" = "BACKUP_RESTORE_STATUS";
+"BACKUP_RESTORE_STATUS" = "Status";
 
 /* An explanation of the consequences of blocking a group. */
 "BLOCK_GROUP_BEHAVIOR_EXPLANATION" = "You will no longer receive messages or updates from this group.";