[7947] Feature: Blank out app preview screen when switching apps on m…

…obile

android/app/src/main/java/im/status/ethereum/MainActivity.java

@@ -14,6 +14,7 @@
 import android.os.Looper;
 import android.support.v4.app.ActivityCompat;
 import android.util.Log;
+import android.view.WindowManager;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.res.Configuration;
@@ -109,7 +110,7 @@ protected void onCreate(Bundle savedInstanceState) {
         final ActivityManager activityManager = getActivityManager();
         Log.v("RNBootstrap", "Available system memory "+getAvailableMemory(activityManager).availMem + ", maximum usable application memory " + activityManager.getLargeMemoryClass()+"M");
 
-
+        setSecureFlag();
         SplashScreen.show(this, true);
         super.onCreate(savedInstanceState);
 
@@ -202,6 +203,18 @@ private void rejectRootedNotification() {
         editor.commit();
     }
 
+    private static final String BLANK_PREVIEW = "BLANK_PREVIEW";
+
+    private void setSecureFlag() {
+        final SharedPreferences prefs = getSharedPreferences(BLANK_PREVIEW, Context.MODE_PRIVATE);
+        final boolean setSecure = prefs.getBoolean(BLANK_PREVIEW, true);
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH && setSecure) {
+            getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
+        } else {
+            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_SECURE);
+        }
+    }
+
     @TargetApi(Build.VERSION_CODES.M)
     public void requestPermissions(String[] permissions, int requestCode, PermissionListener listener) {
         mPermissionListener = listener;

ios/StatusIm/AppDelegate.m

@@ -47,6 +47,10 @@ - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(
     RCTSetLogThreshold(RCTLogLevelTrace);
   }
 
+  NSDictionary *appDefaults = [NSDictionary
+      dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:@"BLANK_PREVIEW"];
+  [[NSUserDefaults standardUserDefaults] registerDefaults:appDefaults];
+
   RCTBridge *bridge = [[RCTBridge alloc] initWithDelegate:self launchOptions:launchOptions];
   RCTRootView *rootView = [[RCTRootView alloc] initWithBridge:bridge
                                                       moduleName:@"StatusIm"
@@ -101,4 +105,36 @@ - (NSURL *)sourceURLForBridge:(RCTBridge *)bridge
 #endif
 }
 
+- (void)applicationWillResignActive:(UIApplication *)application {
+  if ([[NSUserDefaults standardUserDefaults] boolForKey:@"BLANK_PREVIEW"]) {
+    // fill screen with our own colour
+    UIView *colourView = [[UIView alloc]initWithFrame:self.window.frame];
+    colourView.backgroundColor = [UIColor whiteColor];
+    colourView.tag = 2019;
+    colourView.alpha = 0;
+    [self.window addSubview:colourView];
+    [self.window bringSubviewToFront:colourView];
+
+    // fade in the view
+    [UIView animateWithDuration:0.5 animations:^{
+      colourView.alpha = 1;
+    }];
+  } 
+}
+
+- (void)applicationDidBecomeActive:(UIApplication *)application {
+  if ([[NSUserDefaults standardUserDefaults] boolForKey:@"BLANK_PREVIEW"]) {
+    // grab a reference to our coloured view
+    UIView *colourView = [self.window viewWithTag:2019];
+
+    // fade away colour view from main view
+    [UIView animateWithDuration:0.5 animations:^{
+      colourView.alpha = 0;
+    } completion:^(BOOL finished) {
+      // remove when finished fading
+      [colourView removeFromSuperview];
+    }];
+  }
+}
+
 @end

modules/react-native-status/android/src/main/java/im/status/ethereum/module/StatusModule.java

@@ -11,6 +11,7 @@
 import android.os.Environment;
 import android.support.v4.content.FileProvider;
 import android.util.Log;
+import android.view.Window;
 import android.view.WindowManager;
 import android.webkit.CookieManager;
 import android.webkit.CookieSyncManager;
@@ -962,6 +963,34 @@ public void getDeviceUUID(final Callback callback) {
         callback.invoke(uniqueID);
     }
 
+    private static final String BLANK_PREVIEW = "BLANK_PREVIEW";
+
+    @ReactMethod
+    public void setBlankPreviewFlag(final Boolean blankPreview) {
+        final SharedPreferences sharedPrefs = this.reactContext.getSharedPreferences(BLANK_PREVIEW, Context.MODE_PRIVATE);
+        sharedPrefs.edit().putBoolean(BLANK_PREVIEW, blankPreview).commit();
+        setSecureFlag();
+    }
+
+    private void setSecureFlag() {
+        final SharedPreferences prefs = this.reactContext.getSharedPreferences(BLANK_PREVIEW, Context.MODE_PRIVATE);
+        final boolean setSecure = prefs.getBoolean(BLANK_PREVIEW, true);
+        final Activity activity = this.reactContext.getCurrentActivity();
+        if (activity != null) {
+            activity.runOnUiThread(new Runnable() {
+                @Override
+                public void run() {
+                    final Window window = activity.getWindow();
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH && setSecure) {
+                        window.addFlags(WindowManager.LayoutParams.FLAG_SECURE);
+                    } else {
+                        window.clearFlags(WindowManager.LayoutParams.FLAG_SECURE);
+                    }
+                }
+            });
+        }
+    }
+
   private Boolean is24Hour() {
     return android.text.format.DateFormat.is24HourFormat(this.reactContext.getApplicationContext());
   }

modules/react-native-status/ios/RCTStatus/RCTStatus.m

@@ -490,6 +490,15 @@ - (void)handleSignal:(NSString *)signal
     callback(@[Identifier]);
 }
 
+RCT_EXPORT_METHOD(setBlankPreviewFlag:(BOOL *)newValue)
+{
+  NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
+
+  [userDefaults setBool:newValue forKey:@"BLANK_PREVIEW"];
+
+  [userDefaults synchronize];
+}
+
 - (bool) is24Hour
 {
     NSString *format = [NSDateFormatter dateFormatFromTemplate:@"j" options:0 locale:[NSLocale currentLocale]];

src/status_im/accounts/core.cljs

@@ -16,6 +16,11 @@
  (fn [on]
    (native-module/chaos-mode-update on (constantly nil))))
 
+(re-frame/reg-fx
+ ::blank-preview-flag-changed
+ (fn [flag]
+   (native-module/set-blank-preview-flag flag)))
+
 (fx/defn show-mainnet-is-default-alert [{:keys [db]}]
   (let [shown-version (get-in db [:account/account :mainnet-warning-shown-version])
         current-version build/version]
@@ -98,6 +103,14 @@
                                      (assoc settings :web3-opt-in? opt-in)
                                      {})))
 
+(fx/defn switch-preview-privacy-mode [{:keys [db] :as cofx} private?]
+  (let [settings (get-in db [:account/account :settings])]
+    (fx/merge cofx
+              {::blank-preview-flag-changed private?}
+              (accounts.update/update-settings
+               (assoc settings :preview-privacy? private?)
+               {}))))
+
 (fx/defn update-recent-stickers [cofx stickers]
   (accounts.update/account-update cofx
                                   {:recent-stickers stickers}

src/status_im/constants.cljs

@@ -109,6 +109,7 @@
 
 (defn default-account-settings []
   {:web3-opt-in? true
+   :preview-privacy? true
    :wallet       {:visible-tokens {:testnet #{:STT :HND}
                                    :mainnet #{:SNT}
                                    :rinkeby #{:MOKSHA :KDO}

src/status_im/events.cljs

@@ -212,6 +212,11 @@
  (fn [cofx [_ opt-in]]
    (accounts/switch-web3-opt-in-mode cofx opt-in)))
 
+(handlers/register-handler-fx
+ :accounts.ui/preview-privacy-mode-switched
+ (fn [cofx [_ private?]]
+   (accounts/switch-preview-privacy-mode cofx private?)))
+
 (handlers/register-handler-fx
  :accounts.ui/wallet-set-up-confirmed
  (fn [cofx [_ modal?]]

src/status_im/native_module/core.cljs

@@ -88,6 +88,9 @@
 (defn get-device-UUID [callback]
   (native-module/get-device-UUID callback))
 
+(defn set-blank-preview-flag [flag]
+  (native-module/set-blank-preview-flag flag))
+
 (defn is24Hour []
   (native-module/is24Hour))
 

src/status_im/native_module/impl/module.cljs

@@ -133,6 +133,9 @@
    (fn [UUID]
      (callback (string/upper-case UUID)))))
 
+(defn set-blank-preview-flag [flag]
+  (.setBlankPreviewFlag status flag))
+
 (defn extract-group-membership-signatures [signature-pairs callback]
   (when status
     (.extractGroupMembershipSignatures status signature-pairs callback)))

src/status_im/ui/screens/profile/user/views.cljs

@@ -149,6 +149,10 @@
       {:label-kw  :t/web3-opt-in
        :value     (or (nil? (:web3-opt-in? settings)) (:web3-opt-in? settings))
        :action-fn #(re-frame/dispatch [:accounts.ui/web3-opt-in-mode-switched %])}]
+     [profile.components/settings-switch-item
+      {:label-kw  :t/preview-privacy
+       :value     (or (nil? (:preview-privacy? settings)) (:preview-privacy? settings))
+       :action-fn #(re-frame/dispatch [:accounts.ui/preview-privacy-mode-switched %])}]
      [profile.components/settings-item-separator]
      [profile.components/settings-item
       {:label-kw            :t/dapps-permissions

test/cljs/status_im/test/sign_in/data.cljs

@@ -104,6 +104,7 @@
    :last-request                         nil
    :desktop-notifications?               false
    :settings                             {:web3-opt-in? true
+                                          :preview-privacy? true
                                           :fleet        :eth.beta
                                           :wallet       {:visible-tokens {:testnet #{:STT
                                                                                      :HND}

translations/en.json

@@ -786,6 +786,7 @@
     "currency-display-name-usd": "United States Dollar",
     "currency-display-name-uah": "Ukraine Hryvnia",
     "web3-opt-in": "Browser privacy mode",
+    "preview-privacy": "Preview privacy mode",
     "recover-password-invalid": "This account already exists but passwords do not match",
     "recover-keycard-account-not-supported": "Recovering keycard account with password is not supported",
     "members-active-none": "no members",