475 lines
16 KiB
Objective-C
475 lines
16 KiB
Objective-C
//
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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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#import <SignalMessaging/SignalMessaging-Swift.h>
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#import <SignalMessaging/UIView+OWS.h>
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NS_ASSUME_NONNULL_BEGIN
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@interface OWSScreenLockUI ()
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@property (nonatomic) UIWindow *screenBlockingWindow;
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@property (nonatomic) UIViewController *screenBlockingViewController;
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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) BOOL appIsInBackground;
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@property (nonatomic) BOOL isShowingScreenLockUI;
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@property (nonatomic) BOOL didLastUnlockAttemptFail;
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// We want to remain in "screen lock" mode while "local auth"
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// UI is dismissing.
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@property (nonatomic) BOOL shouldClearAuthUIWhenActive;
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@property (nonatomic, nullable) NSDate *appEnteredBackgroundDate;
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@property (nonatomic, nullable) NSDate *appEnteredForegroundDate;
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@property (nonatomic, nullable) NSDate *lastUnlockAttemptDate;
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@property (nonatomic, nullable) NSDate *lastUnlockSuccessDate;
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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(applicationWillEnterForeground:)
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name:OWSApplicationWillEnterForegroundNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(applicationDidEnterBackground:)
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name:OWSApplicationDidEnterBackgroundNotification
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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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_appIsInactive = appIsInactive;
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[self ensureScreenProtection];
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}
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- (void)setAppIsInBackground:(BOOL)appIsInBackground
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{
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if (appIsInBackground) {
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if (!_appIsInBackground) {
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// Record the time when app entered background.
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self.appEnteredBackgroundDate = [NSDate new];
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self.didLastUnlockAttemptFail = NO;
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}
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}
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_appIsInBackground = appIsInBackground;
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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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BOOL shouldHaveScreenLock = self.shouldHaveScreenLock;
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BOOL shouldHaveScreenProtection = self.shouldHaveScreenProtection;
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BOOL shouldShowBlockWindow = shouldHaveScreenProtection || shouldHaveScreenLock;
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DDLogVerbose(@"%@, shouldHaveScreenProtection: %d, shouldHaveScreenLock: %d, shouldShowBlockWindow: %d",
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self.logTag,
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shouldHaveScreenProtection,
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shouldHaveScreenLock,
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shouldShowBlockWindow);
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if (self.screenBlockingWindow.hidden != !shouldShowBlockWindow) {
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DDLogInfo(@"%@, %@.", self.logTag, shouldShowBlockWindow ? @"showing block window" : @"hiding block window");
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}
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[self updateScreenBlockingWindow:shouldShowBlockWindow shouldHaveScreenLock:shouldHaveScreenLock];
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if (shouldHaveScreenLock && !self.didLastUnlockAttemptFail) {
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[self tryToPresentScreenLockUI];
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}
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}
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- (void)tryToPresentScreenLockUI
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{
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OWSAssertIsOnMainThread();
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// If we no longer want to present the screen lock UI, abort.
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if (!self.shouldHaveScreenLock) {
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return;
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}
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if (self.didLastUnlockAttemptFail) {
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return;
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}
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if (self.isShowingScreenLockUI) {
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return;
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}
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DDLogInfo(@"%@, try to unlock screen lock", self.logTag);
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self.isShowingScreenLockUI = YES;
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self.lastUnlockAttemptDate = [NSDate new];
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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.lastUnlockSuccessDate = [NSDate new];
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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 clearAuthUIWhenActive];
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self.didLastUnlockAttemptFail = YES;
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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 clearAuthUIWhenActive];
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self.didLastUnlockAttemptFail = YES;
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// Re-show the unlock UI.
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[self ensureScreenProtection];
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}];
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}
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- (BOOL)shouldHaveScreenProtection
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{
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// Show 'Screen Protection' if:
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//
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// * App is inactive and...
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// * 'Screen Protection' is enabled.
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if (!self.appIsInactive) {
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return NO;
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} else if (!Environment.preferences.screenSecurityIsEnabled) {
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return NO;
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} else {
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return YES;
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}
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}
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- (BOOL)hasUnlockedScreenLock
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{
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if (!self.lastUnlockSuccessDate) {
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return NO;
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} else if (!self.appEnteredBackgroundDate) {
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return YES;
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} else {
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return [self.lastUnlockSuccessDate isAfterDate:self.appEnteredBackgroundDate];
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}
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}
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- (BOOL)shouldHaveScreenLock
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{
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if (![TSAccountManager isRegistered]) {
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// Don't show 'Screen Lock' if user is not registered.
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DDLogVerbose(@"%@ shouldHaveScreenLock NO 1.", self.logTag);
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return NO;
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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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DDLogVerbose(@"%@ shouldHaveScreenLock NO 2.", self.logTag);
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return NO;
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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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DDLogVerbose(@"%@ shouldHaveScreenLock NO 3.", self.logTag);
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return NO;
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} else if (self.appIsInBackground) {
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// Don't show 'Screen Lock' if app is in background.
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DDLogVerbose(@"%@ shouldHaveScreenLock NO 4.", self.logTag);
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return NO;
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} else if (self.isShowingScreenLockUI) {
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// Maintain blocking window in 'screen lock' mode while we're
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// showing the 'Unlock Screen Lock' UI.
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DDLogVerbose(@"%@ shouldHaveScreenLock YES 0.", self.logTag);
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return YES;
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} else if (self.appIsInactive) {
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// Don't show 'Screen Lock' if app is inactive.
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DDLogVerbose(@"%@ shouldHaveScreenLock NO 5.", self.logTag);
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return NO;
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} else if (!self.appEnteredBackgroundDate) {
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// Show 'Screen Lock' if app has just launched.
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DDLogVerbose(@"%@ shouldHaveScreenLock YES 1.", self.logTag);
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return YES;
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} else {
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OWSAssert(self.appEnteredBackgroundDate);
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NSTimeInterval screenLockInterval = fabs([self.appEnteredBackgroundDate 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 (screenLockInterval < screenLockTimeout) {
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// Don't show 'Screen Lock' if 'Screen Lock' timeout hasn't elapsed.
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DDLogVerbose(@"%@ shouldHaveScreenLock NO 6.", self.logTag);
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return NO;
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} else {
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// Otherwise, show 'Screen Lock'.
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DDLogVerbose(@"%@ shouldHaveScreenLock YES 2.", self.logTag);
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return YES;
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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.windowLevel = CGFLOAT_MAX;
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window.backgroundColor = UIColor.ows_materialBlueColor;
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UIViewController *viewController = [UIViewController new];
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viewController.view.backgroundColor = UIColor.ows_materialBlueColor;
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window.rootViewController = viewController;
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self.screenBlockingWindow = window;
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self.screenBlockingViewController = viewController;
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[self updateScreenBlockingWindow:YES shouldHaveScreenLock:NO];
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}
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// The "screen blocking" window has three possible states:
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//
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// * "Just a logo". Used when app is launching and in app switcher. Must match the "Launch Screen"
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// storyboard pixel-for-pixel.
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// * "Screen Lock, local auth UI presented". Move the Signal logo so that it is visible.
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// * "Screen Lock, local auth UI not presented". Move the Signal logo so that it is visible,
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// show "unlock" button.
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- (void)updateScreenBlockingWindow:(BOOL)shouldShowBlockWindow shouldHaveScreenLock:(BOOL)shouldHaveScreenLock
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{
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OWSAssertIsOnMainThread();
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self.screenBlockingWindow.hidden = !shouldShowBlockWindow;
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UIView *rootView = self.screenBlockingViewController.view;
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for (UIView *subview in rootView.subviews) {
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[subview removeFromSuperview];
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}
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UIImage *image = [UIImage imageNamed:@"logoSignal"];
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UIImageView *imageView = [UIImageView new];
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imageView.image = image;
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const CGSize screenSize = UIScreen.mainScreen.bounds.size;
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const CGFloat shortScreenDimension = MIN(screenSize.width, screenSize.height);
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const CGFloat imageSize = round(shortScreenDimension / 3.f);
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[imageView autoSetDimension:ALDimensionWidth toSize:imageSize];
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[imageView autoSetDimension:ALDimensionHeight toSize:imageSize];
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BOOL shouldShowUnlockButton = (!self.appIsInactive && !self.appIsInBackground && self.didLastUnlockAttemptFail);
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DDLogVerbose(@"%@ updateScreenBlockingWindow. shouldShowBlockWindow: %d, shouldHaveScreenLock: %d, "
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@"shouldShowUnlockButton: %d.",
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self.logTag,
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shouldShowBlockWindow,
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shouldHaveScreenLock,
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shouldShowUnlockButton);
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if (shouldHaveScreenLock) {
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const CGFloat kVMargin = 50.f;
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[rootView addSubview:imageView];
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[imageView autoHCenterInSuperview];
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[imageView autoPinTopToSuperviewWithMargin:kVMargin];
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const CGFloat kButtonHeight = 40.f;
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OWSFlatButton *button =
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[OWSFlatButton buttonWithTitle:NSLocalizedString(@"SCREEN_LOCK_UNLOCK_SIGNAL",
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@"Label for button on lock screen that lets users unlock Signal.")
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font:[OWSFlatButton fontForHeight:kButtonHeight]
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titleColor:[UIColor ows_materialBlueColor]
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backgroundColor:[UIColor whiteColor]
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target:self
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selector:@selector(showUnlockUI)];
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[rootView addSubview:button];
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[button autoVCenterInSuperview];
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[button autoSetDimension:ALDimensionHeight toSize:kButtonHeight];
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[button autoPinLeadingToSuperviewWithMargin:50.f];
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[button autoPinTrailingToSuperviewWithMargin:50.f];
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button.hidden = !shouldShowUnlockButton;
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} else {
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UIView *edgesView = [UIView containerView];
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[rootView addSubview:edgesView];
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[edgesView autoPinEdgeToSuperviewEdge:ALEdgeTop];
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[edgesView autoPinEdgeToSuperviewEdge:ALEdgeBottom];
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[edgesView autoPinWidthToSuperview];
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[edgesView addSubview:imageView];
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[imageView autoCenterInSuperview];
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}
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[rootView layoutIfNeeded];
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}
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- (void)showUnlockUI
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{
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OWSAssertIsOnMainThread();
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DDLogInfo(@"showUnlockUI");
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self.didLastUnlockAttemptFail = NO;
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[self ensureScreenProtection];
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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)clearAuthUIWhenActive
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{
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// For continuity, continue to present blocking screen in "screen lock" mode while
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// dismissing the "local auth UI".
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if (self.appIsInactive) {
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self.shouldClearAuthUIWhenActive = YES;
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} else {
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self.isShowingScreenLockUI = NO;
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}
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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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if (self.shouldClearAuthUIWhenActive) {
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self.shouldClearAuthUIWhenActive = NO;
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self.isShowingScreenLockUI = NO;
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}
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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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- (void)applicationWillEnterForeground:(NSNotification *)notification
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{
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// Clear the "delay Screen Lock UI" state; we don't want any
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// delays when presenting the "unlock screen lock UI" after
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// returning from background.
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self.lastUnlockAttemptDate = nil;
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self.lastUnlockSuccessDate = nil;
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self.appIsInBackground = NO;
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self.appEnteredForegroundDate = [NSDate new];
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}
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- (void)applicationDidEnterBackground:(NSNotification *)notification
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{
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self.appIsInBackground = YES;
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}
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@end
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NS_ASSUME_NONNULL_END
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