session-ios/Signal/src/view controllers/FingerprintViewController.m

//
//  FingerprintViewController.m
//  Signal
//
//  Created by Dylan Bourgeois on 02/11/14.
//  Copyright (c) 2014 Open Whisper Systems. All rights reserved.
//

#import "FingerprintViewController.h"
#import "DJWActionSheet+OWS.h"
#import "Environment.h"
#import "OWSConversationSettingsTableViewController.h"
#import "UIViewController+CameraPermissions.h"
#import "Signal-Swift.h"
#import <SignalServiceKit/NSDate+millisecondTimeStamp.h>
#import <SignalServiceKit/OWSFingerprint.h>
#import <SignalServiceKit/TSInfoMessage.h>
#import <SignalServiceKit/TSStorageManager+IdentityKeyStore.h>
#import <SignalServiceKit/TSStorageManager+SessionStore.h>
#import <SignalServiceKit/TSStorageManager+keyingMaterial.h>
#import <SignalServiceKit/TSThread.h>

NS_ASSUME_NONNULL_BEGIN

@interface FingerprintViewController ()

@property (strong, nonatomic) TSStorageManager *storageManager;
@property (strong, nonatomic) TSThread *thread;
@property (strong, nonatomic) OWSFingerprint *fingerprint;
@property (strong, nonatomic) NSString *contactName;
@property (strong, nonatomic) OWSQRCodeScanningViewController *qrScanningController;

@property (strong, nonatomic) IBOutlet UINavigationBar *modalNavigationBar;
@property (strong, nonatomic) IBOutlet UIBarButtonItem *dismissModalButton;
@property (strong, nonatomic) IBOutlet UIView *qrScanningView;
@property (strong, nonatomic) IBOutlet UILabel *scanningInstructions;
@property (strong, nonatomic) IBOutlet UIView *scanningContainer;
@property (strong, nonatomic) IBOutlet UIView *instructionsContainer;
@property (strong, nonatomic) IBOutlet UIView *qrContainer;
@property (strong, nonatomic) IBOutlet UIView *privacyVerificationQRCodeFrame;
@property (strong, nonatomic) IBOutlet UIImageView *privacyVerificationQRCode;
@property (strong, nonatomic) IBOutlet OWSCopyableLabel *privacyVerificationFingerprint;
@property (strong, nonatomic) IBOutlet UILabel *instructionsLabel;
@property (strong, nonatomic) IBOutlet UIButton *scanButton;

@end

@implementation FingerprintViewController

- (void)configureWithThread:(TSThread *)thread
                fingerprint:(OWSFingerprint *)fingerprint
                contactName:(NSString *)contactName
{
    self.thread = thread;
    self.fingerprint = fingerprint;
    self.contactName = contactName;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.navigationItem.leftBarButtonItem = self.dismissModalButton;
    [self.modalNavigationBar pushNavigationItem:self.navigationItem animated:NO];

    // HACK for transparent navigation bar.
    [self.modalNavigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
    self.modalNavigationBar.shadowImage = [UIImage new];
    self.modalNavigationBar.translucent = YES;

    self.storageManager = [TSStorageManager sharedManager];

    // HACK to get full width preview layer
    CGRect oldFrame = self.qrScanningView.frame;
    CGRect newFrame = CGRectMake(oldFrame.origin.x,
        oldFrame.origin.y,
        self.view.frame.size.width,
        self.view.frame.size.height / 2.0f - oldFrame.origin.y);
    self.qrScanningView.frame = newFrame;
    // END HACK to get full width preview layer

    self.title = NSLocalizedString(@"PRIVACY_VERIFICATION_TITLE", @"Navbar title");
    NSString *instructionsFormat = NSLocalizedString(@"PRIVACY_VERIFICATION_INSTRUCTIONS",
        @"Paragraph(s) shown alongside keying material when verifying privacy with {{contact name}}");
    self.instructionsLabel.text = [NSString stringWithFormat:instructionsFormat, self.contactName];

    NSString *scanTitle = NSLocalizedString(@"SCAN_CODE_ACTION",
        @"Button label presented with camera icon while verifying privacy credentials. Shows the camera interface.");
    [self.scanButton setTitle:scanTitle forState:UIControlStateNormal];
    self.scanningInstructions.text
        = NSLocalizedString(@"SCAN_CODE_INSTRUCTIONS", @"label presented once scanning (camera) view is visible.");

    // Safety numbers and QR Code
    self.privacyVerificationFingerprint.text = self.fingerprint.displayableText;
    self.privacyVerificationQRCode.image = self.fingerprint.image;

    // Don't antialias QRCode
    self.privacyVerificationQRCode.layer.magnificationFilter = kCAFilterNearest;
}

- (void)viewDidLayoutSubviews
{
    [super viewDidLayoutSubviews];

    // On iOS8, the QRCodeFrame hasn't been layed out yet (causing the QRCode to be hidden), force it here.
    [self.privacyVerificationQRCodeFrame setNeedsLayout];
    [self.privacyVerificationQRCodeFrame layoutIfNeeded];
    // Round QR Code.
    self.privacyVerificationQRCodeFrame.layer.masksToBounds = YES;
    self.privacyVerificationQRCodeFrame.layer.cornerRadius = self.privacyVerificationQRCodeFrame.frame.size.height / 2;
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:YES];
    if (self.dismissDelegate) {
        [self.dismissDelegate presentedModalWasDismissed];
    }
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(nullable id)sender
{
    if ([segue.identifier isEqualToString:@"embedIdentityQRScanner"]) {
        OWSQRCodeScanningViewController *qrScanningController
            = (OWSQRCodeScanningViewController *)segue.destinationViewController;
        self.qrScanningController = qrScanningController;
        qrScanningController.scanDelegate = self;
    }
}

#pragma mark - Action
- (IBAction)closeButtonAction:(id)sender
{
    [self dismissViewControllerAnimated:YES completion:nil];
}

- (IBAction)didTouchUpInsideScanButton:(id)sender
{
    [self showScanner];
}

- (void)showScanner
{
    [self ows_askForCameraPermissions:^{
        DDLogInfo(@"%@ Showing Scanner", self.tag);
        self.qrScanningView.hidden = NO;
        self.scanningInstructions.hidden = NO;
        [UIView animateWithDuration:0.4
                              delay:0.0
                            options:UIViewAnimationOptionCurveEaseInOut
                         animations:^{
                             self.scanningContainer.frame = self.qrContainer.frame;
                             self.qrContainer.frame = self.instructionsContainer.frame;
                             self.instructionsContainer.alpha = 0.0f;
                         }
                         completion:nil];
        
        [self.qrScanningController startCapture];
    }
                   alertActionHandler:nil];
}

// pragma mark - OWSQRScannerDelegate
- (void)controller:(OWSQRCodeScanningViewController *)controller didDetectQRCodeWithData:(NSData *)data;
{
    [self verifyCombinedFingerprintData:data];
}

- (void)verifyCombinedFingerprintData:(NSData *)combinedFingerprintData
{
    NSError *error;
    if ([self.fingerprint matchesLogicalFingerprintsData:combinedFingerprintData error:&error]) {
        DDLogInfo(@"%@ Successfully verified privacy.", self.tag);
        NSString *successTitle = NSLocalizedString(@"SUCCESSFUL_VERIFICATION_TITLE", nil);
        NSString *dismissText = NSLocalizedString(@"DISMISS_BUTTON_TEXT", nil);
        NSString *descriptionFormat = NSLocalizedString(
            @"SUCCESSFUL_VERIFICATION_DESCRIPTION", @"Alert body after verifying privacy with {{other user's name}}");
        NSString *successDescription = [NSString stringWithFormat:descriptionFormat, self.contactName];
        UIAlertController *successAlertController =
            [UIAlertController alertControllerWithTitle:successTitle
                                                message:successDescription
                                         preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *dismissAction =
            [UIAlertAction actionWithTitle:dismissText
                                     style:UIAlertActionStyleDefault
                                   handler:^(UIAlertAction *_Nonnull action) {
                                       [self dismissViewControllerAnimated:YES completion:nil];
                                   }];
        [successAlertController addAction:dismissAction];

        [self presentViewController:successAlertController animated:YES completion:nil];
    } else {
        [self failVerificationWithError:error];
    }
}

- (void)failVerificationWithError:(NSError *)error
{
    NSString *failureTitle = NSLocalizedString(@"FAILED_VERIFICATION_TITLE", @"alert title");
    UIAlertController *failureAlertController =
        [UIAlertController alertControllerWithTitle:failureTitle
                                            message:error.localizedDescription
                                     preferredStyle:UIAlertControllerStyleAlert];

    NSString *cancelText = NSLocalizedString(@"TXT_CANCEL_TITLE", nil);
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:cancelText
                                                           style:UIAlertActionStyleCancel
                                                         handler:^(UIAlertAction *_Nonnull action) {
                                                             [self dismissViewControllerAnimated:YES completion:nil];
                                                         }];
    [failureAlertController addAction:cancelAction];

    // TODO
    //        NSString retryText = NSLocalizedString(@"RETRY_BUTTON_TEXT", nil);
    //        UIAlertAction *retryAction = [UIAlertAction actionWithTitle:retryText style:UIAlertActionStyleDefault
    //        handler:^(UIAlertAction * _Nonnull action) {
    //
    //        }];
    //        [failureAlertController addAction:retryAction];
    [self presentViewController:failureAlertController animated:YES completion:nil];

    DDLogWarn(@"%@ Identity verification failed with error: %@", self.tag, error);
}

- (void)dismissViewControllerAnimated:(BOOL)flag completion:(nullable void (^)(void))completion
{
    self.qrScanningView.hidden = YES;
    [super dismissViewControllerAnimated:flag completion:completion];
}

#pragma mark - Logging

+ (NSString *)tag
{
    return [NSString stringWithFormat:@"[%@]", self.class];
}

- (NSString *)tag
{
    return self.class.tag;
}

@end

NS_ASSUME_NONNULL_END