mirror of https://github.com/oxen-io/session-ios
Add screen lock feature.
Matthew Chen
7 years ago
parent
1f82891024
commit
cf0e6fce09
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//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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NS_ASSUME_NONNULL_BEGIN
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@interface OWSScreenLockUI : NSObject
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- (instancetype)init NS_UNAVAILABLE;
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+ (instancetype)sharedManager;
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- (void)setupWithRootWindow:(UIWindow *)rootWindow;
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@end
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NS_ASSUME_NONNULL_END
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@ -0,0 +1,256 @@
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//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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#import "OWSScreenLockUI.h"
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#import "Signal-Swift.h"
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NS_ASSUME_NONNULL_BEGIN
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@interface OWSScreenLockUI ()
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// Unlike UIApplication.applicationState, this state is
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// updated conservatively, e.g. the flag is cleared during
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// "will enter background."
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@property (nonatomic) BOOL appIsInactive;
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@property (nonatomic, nullable) NSDate *appBecameInactiveDate;
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@property (nonatomic) UIWindow *screenBlockingWindow;
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@property (nonatomic) BOOL hasUnlockedScreenLock;
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@property (nonatomic) BOOL isShowingScreenLockUI;
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@end
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#pragma mark -
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@implementation OWSScreenLockUI
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+ (instancetype)sharedManager
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{
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static OWSScreenLockUI *instance = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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instance = [[self alloc] initDefault];
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});
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return instance;
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}
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- (instancetype)initDefault
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{
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self = [super init];
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if (!self) {
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return self;
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}
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[self observeNotifications];
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OWSSingletonAssert();
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return self;
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}
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- (void)dealloc
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{
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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}
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- (void)observeNotifications
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{
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(applicationDidBecomeActive:)
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name:OWSApplicationDidBecomeActiveNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(applicationWillResignActive:)
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name:OWSApplicationWillResignActiveNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(registrationStateDidChange)
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name:RegistrationStateDidChangeNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(screenLockDidChange:)
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name:OWSScreenLock.ScreenLockDidChange
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object:nil];
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}
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- (void)setupWithRootWindow:(UIWindow *)rootWindow
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{
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OWSAssertIsOnMainThread();
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OWSAssert(rootWindow);
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[self prepareScreenProtectionWithRootWindow:rootWindow];
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[AppReadiness runNowOrWhenAppIsReady:^{
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[self ensureScreenProtection];
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}];
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}
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#pragma mark - Methods
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- (void)setAppIsInactive:(BOOL)appIsInactive
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{
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if (appIsInactive) {
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if (!_appIsInactive) {
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// Whenever app becomes inactive, clear this state.
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self.hasUnlockedScreenLock = NO;
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// Note the time when app became inactive.
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self.appBecameInactiveDate = [NSDate new];
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}
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}
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_appIsInactive = appIsInactive;
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[self ensureScreenProtection];
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}
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- (void)ensureScreenProtection
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{
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OWSAssertIsOnMainThread();
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if (!AppReadiness.isAppReady) {
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[AppReadiness runNowOrWhenAppIsReady:^{
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[self ensureScreenProtection];
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}];
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return;
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}
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// Don't show 'Screen Protection' if:
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//
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// * App is active or...
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// * 'Screen Protection' is not enabled.
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BOOL shouldHaveScreenProtection = (self.appIsInactive && Environment.preferences.screenSecurityIsEnabled);
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BOOL shouldHaveScreenLock = NO;
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if (self.appIsInactive) {
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// Don't show 'Screen Lock' if app is inactive.
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} else if (![TSAccountManager isRegistered]) {
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// Don't show 'Screen Lock' if user is not registered.
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} else if (!OWSScreenLock.sharedManager.isScreenLockEnabled) {
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// Don't show 'Screen Lock' if 'Screen Lock' isn't enabled.
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} else if (self.hasUnlockedScreenLock) {
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// Don't show 'Screen Lock' if 'Screen Lock' has been unlocked.
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} else if (!self.appBecameInactiveDate) {
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// Show 'Screen Lock' if app hasn't become inactive yet (just launched).
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shouldHaveScreenLock = YES;
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} else {
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OWSAssert(self.appBecameInactiveDate);
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NSTimeInterval screenLockInterval = fabs([self.appBecameInactiveDate timeIntervalSinceNow]);
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NSTimeInterval screenLockTimeout = OWSScreenLock.sharedManager.screenLockTimeout;
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OWSAssert(screenLockInterval >= 0);
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OWSAssert(screenLockTimeout >= 0);
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if (self.appBecameInactiveDate && screenLockInterval < screenLockTimeout) {
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// Don't show 'Screen Lock' if 'Screen Lock' timeout hasn't elapsed.
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shouldHaveScreenProtection = YES;
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// Check again when screen lock timeout should elapse.
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NSTimeInterval screenLockRemaining = screenLockTimeout - screenLockInterval + 0.2f;
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OWSAssert(screenLockRemaining >= 0);
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dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(screenLockRemaining * NSEC_PER_SEC)),
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dispatch_get_main_queue(),
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^{
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[self ensureScreenProtection];
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});
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} else {
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// Otherwise, show 'Screen Lock'.
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shouldHaveScreenLock = YES;
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}
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}
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BOOL shouldShowBlockWindow = shouldHaveScreenProtection || shouldHaveScreenLock;
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self.screenBlockingWindow.hidden = !shouldShowBlockWindow;
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if (shouldHaveScreenLock) {
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if (!self.isShowingScreenLockUI) {
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self.isShowingScreenLockUI = YES;
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[OWSScreenLock.sharedManager tryToUnlockScreenLockWithSuccess:^{
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DDLogInfo(@"%@ unlock screen lock succeeded.", self.logTag);
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self.isShowingScreenLockUI = NO;
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self.hasUnlockedScreenLock = YES;
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[self ensureScreenProtection];
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}
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failure:^(NSError *error) {
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DDLogInfo(@"%@ unlock screen lock failed.", self.logTag);
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self.isShowingScreenLockUI = NO;
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[self showScreenLockFailureAlertWithMessage:error.localizedDescription];
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}
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cancel:^{
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DDLogInfo(@"%@ unlock screen lock cancelled.", self.logTag);
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self.isShowingScreenLockUI = NO;
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[self showScreenLockFailureAlertWithMessage:
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NSLocalizedString(@"SCREEN_LOCK_UNLOCK_CANCELLED",
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@"Message for alert indicating that screen lock unlock was cancelled.")];
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}];
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}
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}
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}
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- (void)showScreenLockFailureAlertWithMessage:(NSString *)message
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{
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OWSAssertIsOnMainThread();
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[OWSAlerts showAlertWithTitle:NSLocalizedString(@"SCREEN_LOCK_UNLOCK_FAILED",
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@"Title for alert indicating that screen lock could not be unlocked.")
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message:message
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buttonTitle:nil
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buttonAction:^(UIAlertAction *action) {
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// After the alert, re-show the unlock UI.
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[self ensureScreenProtection];
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}];
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}
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// 'Screen Blocking' window obscures the app screen:
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//
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// * In the app switcher.
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// * During 'Screen Lock' unlock process.
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- (void)prepareScreenProtectionWithRootWindow:(UIWindow *)rootWindow
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{
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OWSAssertIsOnMainThread();
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OWSAssert(rootWindow);
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UIWindow *window = [[UIWindow alloc] initWithFrame:rootWindow.bounds];
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window.hidden = YES;
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window.opaque = YES;
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window.userInteractionEnabled = NO;
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window.windowLevel = CGFLOAT_MAX;
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window.backgroundColor = UIColor.ows_materialBlueColor;
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window.rootViewController =
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[[UIStoryboard storyboardWithName:@"Launch Screen" bundle:nil] instantiateInitialViewController];
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self.screenBlockingWindow = window;
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}
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#pragma mark - Events
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- (void)screenLockDidChange:(NSNotification *)notification
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{
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[self ensureScreenProtection];
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}
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- (void)registrationStateDidChange
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{
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OWSAssertIsOnMainThread();
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DDLogInfo(@"registrationStateDidChange");
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[self ensureScreenProtection];
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}
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- (void)applicationDidBecomeActive:(NSNotification *)notification
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{
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self.appIsInactive = NO;
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}
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- (void)applicationWillResignActive:(NSNotification *)notification
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{
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self.appIsInactive = YES;
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}
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@end
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NS_ASSUME_NONNULL_END
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