bundesmessenger-ios/Riot/Modules/Authentication/Legacy/AuthenticationViewController.m

/*
 Copyright 2015 OpenMarket Ltd
 Copyright 2017 Vector Creations Ltd
 Copyright 2019 New Vector Ltd
 Copyright (c) 2021 BWI GmbH

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
 http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

#import "AuthenticationViewController.h"

#import "MXSession+Riot.h"

#import "AuthInputsView.h"
#import "ForgotPasswordInputsView.h"
#import "AuthFallBackViewController.h"

#import "GeneratedInterface-Swift.h"

static const CGFloat kAuthInputContainerViewMinHeightConstraintConstant = 150.0;

@interface AuthenticationViewController () <AuthFallBackViewControllerDelegate, SetPinCoordinatorBridgePresenterDelegate,
    SocialLoginListViewDelegate,
    SSOAuthenticationPresenterDelegate
>
{
    /**
     The default country code used to initialize the mobile phone number input.
     */
    NSString *defaultCountryCode;
    
    /**
     Observe kThemeServiceDidChangeThemeNotification to handle user interface theme change.
     */
    id kThemeServiceDidChangeThemeNotificationObserver;

    /**
     Observe AppDelegateUniversalLinkDidChangeNotification to handle universal link changes.
     */
    id universalLinkDidChangeNotificationObserver;

    /**
     Server discovery.
     */
    MXAutoDiscovery *autoDiscovery;

    AuthFallBackViewController *authFallBackViewController;
    
    // successful login credentials
    MXCredentials *loginCredentials;
    
    // Check false display of this screen only once
    BOOL didCheckFalseAuthScreenDisplay;
}

@property (nonatomic, readonly) BOOL isIdentityServerConfigured;
@property (nonatomic, strong) SetPinCoordinatorBridgePresenter *setPinCoordinatorBridgePresenter;
@property (nonatomic, strong) KeyboardAvoider *keyboardAvoider;

@property (weak, nonatomic) IBOutlet UIView *socialLoginContainerView;
@property (nonatomic, weak) SocialLoginListView *socialLoginListView;

@property (nonatomic, strong) SSOAuthenticationPresenter *ssoAuthenticationPresenter;

// Current SSO flow containing Identity Providers. Used for `socialLoginListView`
@property (nonatomic, strong) MXLoginSSOFlow *currentLoginSSOFlow;

// Current SSO transaction id used to identify and validate the SSO authentication callback
@property (nonatomic, strong) NSString *ssoCallbackTxnId;
/**
 The SSO provider that was used to successfully complete login, otherwise `nil`.
 */
@property (nonatomic, readwrite, nullable) SSOIdentityProvider *ssoIdentityProvider;

@property (nonatomic, getter = isFirstViewAppearing) BOOL firstViewAppearing;

@property (nonatomic, strong) UISwitch *bwServerOptionsSwitch;
@property (nonatomic, strong) UILabel *bwServerOptionsLabel;
@property (nonatomic, strong) UISegmentedControl *bwServerOptionsControl;

@property (nonatomic, strong) UIButton *bwServerPreSelectionButton;

@property (nonatomic, strong) UIButton *bwRegisterButton;

@property (nonatomic, strong) MXKErrorAlertPresentation *errorPresenter;

@end

@implementation AuthenticationViewController

+ (UINib *)nib
{
    return [UINib nibWithNibName:NSStringFromClass(self)
                          bundle:[NSBundle bundleForClass:self]];
}

+ (instancetype)authenticationViewController
{
    return [[[self class] alloc] initWithNibName:NSStringFromClass(self)
                                          bundle:[NSBundle bundleForClass:self]];
}

#pragma mark -

- (void)finalizeInit
{
    [super finalizeInit];
    
    // Setup `MXKViewControllerHandling` properties
    self.enableBarTintColorStatusChange = NO;
    self.rageShakeManager = [RageShakeManager sharedManager];
    
    // Set a default country code
    // Note: this value is used only when no MCC and no local country code is available.
    defaultCountryCode = @"GB";
    
    didCheckFalseAuthScreenDisplay = NO;
    
    _firstViewAppearing = YES;
    
    self.errorPresenter = [MXKErrorAlertPresentation new];
}

- (void)viewDidLoad
{
    /*
     * An alert message will be displayed when a Man in the middle is detected.
     */
    [self displayCouldNotVerifyIdentityOfRemoteServer];
    
    [super viewDidLoad];
    
    self.navigationItem.title = nil;
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:VectorL10n.authRegister
                                                                              style:UIBarButtonItemStylePlain
                                                                             target:self
                                                                             action:@selector(onButtonPressed:)];
    
    AppConfigService *service = AppConfigService.shared;
    
    self.defaultHomeServerUrl       = service.serverUrl;
    self.defaultIdentityServerUrl   = service.serverUrl;
    
    self.welcomeImageView.image = AssetSharedImages.horizontalLogo.image;
    
    [self.submitButton.layer setCornerRadius:5];
    self.submitButton.clipsToBounds = YES;
    [self.submitButton setTitle:[VectorL10n authLogin] forState:UIControlStateNormal];
    [self.submitButton setTitle:[VectorL10n authLogin] forState:UIControlStateHighlighted];
    self.submitButton.enabled = YES;
    
    [self.skipButton.layer setCornerRadius:5];
    self.skipButton.clipsToBounds = YES;
    [self.skipButton setTitle:[VectorL10n authSkip] forState:UIControlStateNormal];
    [self.skipButton setTitle:[VectorL10n authSkip] forState:UIControlStateHighlighted];
    self.skipButton.enabled = YES;
    
    [self.customServersTickButton setImage:AssetImages.selectionUntick.image forState:UIControlStateNormal];
    [self.customServersTickButton setImage:AssetImages.selectionUntick.image forState:UIControlStateHighlighted];
    
    if (!BuildSettings.authScreenShowRegister)
    {
        self.navigationItem.rightBarButtonItem.enabled = NO;
        self.navigationItem.rightBarButtonItem.title = nil;
    }
    self.serverOptionsContainer.hidden = !BuildSettings.authScreenShowCustomServerOptions;
    
    [self setCustomServerFieldsVisible:NO];

    if( BuildSettings.authScreenShowTestServerOptions ) {
        [self enableTestServerControl];
    }
    
    if( BuildSettings.bwiEnableRegisterInfo ) {
        [self enableRegisterButton];
    }

    // Soft logout section
    self.softLogoutClearDataButton.layer.cornerRadius = 5;
    self.softLogoutClearDataButton.clipsToBounds = YES;
    [self.softLogoutClearDataButton setTitle:[VectorL10n authSoftlogoutClearDataButton] forState:UIControlStateNormal];
    [self.softLogoutClearDataButton setTitle:[VectorL10n authSoftlogoutClearDataButton] forState:UIControlStateHighlighted];
    self.softLogoutClearDataButton.enabled = YES;
    self.softLogoutClearDataContainer.hidden = YES;
    
    // The view controller dismiss itself on successful login.
    self.delegate = self;
    
    self.homeServerTextField.placeholder = [VectorL10n authHomeServerPlaceholder];
    self.identityServerTextField.placeholder = [VectorL10n authIdentityServerPlaceholder];
    
    // Headline and subheadlineIntroLabel
    self.headlineIntroLabel.text = NSLocalizedStringFromTable(@"auth_login_headline_text", @"Vector", nil);
    self.subheadlineIntroLabel.text = NSLocalizedStringFromTable(@"auth_login_subheadline_text", @"Vector", nil);

    self.authenticationActivityIndicatorContainerView.layer.cornerRadius = 5;
    [self.authenticationActivityIndicator addObserver:self
                                           forKeyPath:@"hidden"
                                              options:0
                                              context:nil];
    
    // Custom used authInputsView
    [self registerAuthInputsViewClass:AuthInputsView.class forAuthType:MXKAuthenticationTypeLogin];
    [self registerAuthInputsViewClass:AuthInputsView.class forAuthType:MXKAuthenticationTypeRegister];
    [self registerAuthInputsViewClass:ForgotPasswordInputsView.class forAuthType:MXKAuthenticationTypeForgotPassword];
    
    // Initialize the auth inputs display
    AuthInputsView *authInputsView = [AuthInputsView authInputsView];
    MXAuthenticationSession *authSession = [MXAuthenticationSession modelFromJSON:@{@"flows":@[@{@"stages":@[kMXLoginFlowTypePassword]}]}];
    [authInputsView setAuthSession:authSession withAuthType:MXKAuthenticationTypeLogin];
    self.authInputsView = authInputsView;

    [self setupPasswordIndicator: authInputsView];

    // Listen to action within the child view
    [authInputsView.ssoButton addTarget:self action:@selector(onButtonPressed:) forControlEvents:UIControlEventTouchUpInside];

    // Observe user interface theme change.
    kThemeServiceDidChangeThemeNotificationObserver = [[NSNotificationCenter defaultCenter] addObserverForName:kThemeServiceDidChangeThemeNotification object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *notif) {
        
        [self userInterfaceThemeDidChange];
        
    }];
    universalLinkDidChangeNotificationObserver = [[NSNotificationCenter defaultCenter] addObserverForName:AppDelegateUniversalLinkDidChangeNotification object:nil queue:nil usingBlock:^(NSNotification * _Nonnull notification) {
        [self updateUniversalLink];
    }];

    [self userInterfaceThemeDidChange];
    [self updateUniversalLink];
    
    [self.forgotPasswordButton.centerXAnchor constraintEqualToAnchor:self.contentView.centerXAnchor].active = YES;
    [self.forgotPasswordButton.topAnchor constraintEqualToAnchor:self.submitButton.bottomAnchor constant:35].active = YES;
    
    [self.submitButton.centerXAnchor constraintEqualToAnchor:self.contentView.centerXAnchor].active = YES;
    [self.submitButton.leadingAnchor constraintEqualToAnchor:self.contentView.leadingAnchor constant:45].active = YES;
    
    _keyboardAvoider = [[KeyboardAvoider alloc] initWithScrollViewContainerView:self.view scrollView:self.authenticationScrollView];
    
    [BwiSettings.shared reset];
}

-(void)setupPasswordIndicator:(AuthInputsView *)authInputsView
{
    // make sure that we always start with password entry field where the user input is hidden
    UITextField *passwordTextField = [authInputsView passWordTextField];
    [passwordTextField setSecureTextEntry:TRUE];

    if (BuildSettings.passwordIndicatorOnLogin)
    {
        [authInputsView.passwordVisibilityToggleButton setTintColor: ThemeService.shared.theme.tintColor];
        [authInputsView.passwordVisibilityToggleButton addTarget:self action:@selector(onPasswordVisibilityToggleButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
    } else {
        [authInputsView.passwordVisibilityToggleButton setHidden:TRUE];
        [authInputsView.passwordVisibilityToggleButton setUserInteractionEnabled:FALSE];
    }
}

- (void)presentForgotPasswordInformationAlert
{
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:NSLocalizedStringFromTable(@"auth_forgot_password", @"Vector", nil)
                                                                   message:NSLocalizedStringFromTable(@"bwi_auth_forgot_password_alert_text", @"Vector", nil)
                                                            preferredStyle:UIAlertControllerStyleAlert];
    [alert addAction:[UIAlertAction actionWithTitle:[VectorL10n ok] style:UIAlertActionStyleDefault handler:nil]];
    [self presentViewController:alert animated:YES completion:nil];
}

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id <UIViewControllerTransitionCoordinator>)coordinator
{
    UIDeviceOrientation deviceOrientation = [[UIDevice currentDevice] orientation];
    self.authInputsContainerViewTopConstraint.constant = deviceOrientation == UIDeviceOrientationPortrait ? 190 : 160;
    
    MXAuthenticationSession *authSession = [MXAuthenticationSession modelFromJSON:@{@"flows":@[@{@"stages":@[kMXLoginFlowTypePassword]}]}];
    [self.authInputsView setAuthSession:authSession withAuthType:MXKAuthenticationTypeLogin];
}

- (void)userInterfaceThemeDidChange
{
    [ThemeService.shared.theme applyStyleOnNavigationBar:self.navigationController.navigationBar
                          withModernScrollEdgeAppearance:YES];
    
    self.view.backgroundColor = ThemeService.shared.theme.backgroundColor;

    self.authenticationScrollView.backgroundColor = ThemeService.shared.theme.backgroundColor;
    
    self.welcomeImageView.tintColor = ThemeService.shared.theme.tintColor;

    // Style the authentication fallback webview screen so that its header matches to navigation bar style
    self.authFallbackContentView.backgroundColor = ThemeService.shared.theme.baseColor;
    self.cancelAuthFallbackButton.tintColor = ThemeService.shared.theme.baseTextPrimaryColor;

    if (self.homeServerTextField.placeholder)
    {
        self.homeServerTextField.attributedPlaceholder = [[NSAttributedString alloc]
                                                          initWithString:self.homeServerTextField.placeholder
                                                          attributes:@{NSForegroundColorAttributeName: ThemeService.shared.theme.placeholderTextColor}];
    }
    if (self.identityServerTextField.placeholder)
    {
        self.identityServerTextField.attributedPlaceholder = [[NSAttributedString alloc]
                                                              initWithString:self.identityServerTextField.placeholder
                                                              attributes:@{NSForegroundColorAttributeName: ThemeService.shared.theme.placeholderTextColor}];
    }
    
    self.submitButton.backgroundColor = ThemeService.shared.theme.tintColor;
    self.skipButton.backgroundColor = ThemeService.shared.theme.tintColor;
    
    self.authenticationActivityIndicator.color = ThemeService.shared.theme.textSecondaryColor;
    self.authenticationActivityIndicatorContainerView.backgroundColor = ThemeService.shared.theme.baseColor;
    self.noFlowLabel.textColor = ThemeService.shared.theme.warningColor;
    
    NSMutableAttributedString *forgotPasswordTitle = [[NSMutableAttributedString alloc] initWithString:[VectorL10n authForgotPassword]];
    [forgotPasswordTitle addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleSingle) range:NSMakeRange(0, forgotPasswordTitle.length)];
    [forgotPasswordTitle addAttribute:NSForegroundColorAttributeName value:ThemeService.shared.theme.tintColor range:NSMakeRange(0, forgotPasswordTitle.length)];
    [self.forgotPasswordButton setAttributedTitle:forgotPasswordTitle forState:UIControlStateNormal];
    [self.forgotPasswordButton setAttributedTitle:forgotPasswordTitle forState:UIControlStateHighlighted];
    
    NSMutableAttributedString *forgotPasswordTitleDisabled = [[NSMutableAttributedString alloc] initWithAttributedString:forgotPasswordTitle];
    [forgotPasswordTitleDisabled addAttribute:NSForegroundColorAttributeName value:[ThemeService.shared.theme.tintColor colorWithAlphaComponent:0.3] range:NSMakeRange(0, forgotPasswordTitle.length)];
    [self.forgotPasswordButton setAttributedTitle:forgotPasswordTitleDisabled forState:UIControlStateDisabled];
    
    [self updateForgotPwdButtonVisibility];
    
    NSAttributedString *serverOptionsTitle = [[NSAttributedString alloc] initWithString:[VectorL10n authUseServerOptions] attributes:@{NSForegroundColorAttributeName : ThemeService.shared.theme.textSecondaryColor, NSFontAttributeName: [UIFont systemFontOfSize:14]}];
    [self.customServersTickButton setAttributedTitle:serverOptionsTitle forState:UIControlStateNormal];
    [self.customServersTickButton setAttributedTitle:serverOptionsTitle forState:UIControlStateHighlighted];
    
    self.homeServerSeparator.backgroundColor = ThemeService.shared.theme.lineBreakColor;
    self.homeServerTextField.textColor = ThemeService.shared.theme.textPrimaryColor;
    self.homeServerLabel.textColor = ThemeService.shared.theme.textSecondaryColor;
    
    self.identityServerSeparator.backgroundColor = ThemeService.shared.theme.lineBreakColor;
    self.identityServerTextField.textColor = ThemeService.shared.theme.textPrimaryColor;
    self.identityServerLabel.textColor = ThemeService.shared.theme.textSecondaryColor;
    
    self.headlineIntroLabel.textColor = ThemeService.shared.theme.textPrimaryColor;
    self.subheadlineIntroLabel.textColor = ThemeService.shared.theme.textSecondaryColor;

    self.activityIndicator.backgroundColor = ThemeService.shared.theme.overlayBackgroundColor;

    self.softLogoutClearDataLabel.textColor = ThemeService.shared.theme.textPrimaryColor;
    self.softLogoutClearDataButton.backgroundColor = ThemeService.shared.theme.warningColor;
    
    self.customServersTickButton.tintColor = ThemeService.shared.theme.tintColor;

    [self.authInputsView customizeViewRendering];
    
    [self setNeedsStatusBarAppearanceUpdate];
}

- (void)updateUniversalLink
{
    UniversalLink *link = [AppDelegate theDelegate].lastHandledUniversalLink;
    if (link)
    {
        NSString *emailAddress = link.queryParams[@"email"];
        if (emailAddress && self.authInputsView)
        {
            AuthInputsView *inputsView = (AuthInputsView *)self.authInputsView;
            inputsView.emailTextField.text = emailAddress;
        }
    }
}

- (UIStatusBarStyle)preferredStatusBarStyle
{
    return ThemeService.shared.theme.statusBarStyle;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    
    [_keyboardAvoider startAvoiding];
    [self.navigationController setNavigationBarHidden:NO animated:YES];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    
    if (self.isFirstViewAppearing)
    {
        self.firstViewAppearing = NO;
    }

    // Verify that the app does not show the authentication screen whereas
    // the user has already logged in.
    // This bug rarely happens (https://github.com/vector-im/riot-ios/issues/1643)
    // but it invites the user to log in again. They will then lose all their
    // e2e messages.
    if (!didCheckFalseAuthScreenDisplay)
    {
        didCheckFalseAuthScreenDisplay = YES;
        
        MXLogDebug(@"[AuthenticationVC] viewDidAppear: Checking false logout");
        [MXKAccountManager sharedManagerWithReload: YES];
        if ([MXKAccountManager sharedManager].activeAccounts.count)
        {
            // For now, we do not have better solution than forcing the user to restart the app
            [NSException raise:@"False logout. Kill the app" format:@"AuthenticationViewController has been displayed whereas there is an existing account"];
        }
    }
    
    [[AppDelegate theDelegate] checkJailbreak];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [_keyboardAvoider stopAvoiding];
    
    [super viewDidDisappear:animated];
}

- (void)viewDidLayoutSubviews
{
    [super viewDidLayoutSubviews];
    
    if (self.isFirstViewAppearing)
    {
        [self refreshContentViewHeightConstraint];
    }
    
    // bwRegisterButton has no constraints so we must set the frame position and size here
    CGRect passwordframe = self.forgotPasswordButton.frame;
    CGRect registerFrame = CGRectMake(self.forgotPasswordButton.frame.origin.x, passwordframe.origin.y + 85, self.forgotPasswordButton.frame.size.width , passwordframe.size.height);
    self.bwRegisterButton.frame = registerFrame;
}

- (void)destroy
{
    [super destroy];
    
    if (kThemeServiceDidChangeThemeNotificationObserver)
    {
        [[NSNotificationCenter defaultCenter] removeObserver:kThemeServiceDidChangeThemeNotificationObserver];
        kThemeServiceDidChangeThemeNotificationObserver = nil;
    }

    if (universalLinkDidChangeNotificationObserver)
    {
        [[NSNotificationCenter defaultCenter] removeObserver:universalLinkDidChangeNotificationObserver];
        universalLinkDidChangeNotificationObserver = nil;
    }
    
    [self.authenticationActivityIndicator removeObserver:self forKeyPath:@"hidden"];

    autoDiscovery = nil;
    _keyboardAvoider = nil;
}

- (BOOL)isIdentityServerConfigured
{
    return self.identityServerTextField.text.length > 0;
}

- (void)setAuthType:(MXKAuthenticationType)authType
{
    if (self.authType == MXKAuthenticationTypeRegister)
    {
        // Restore the default registration screen
        [self updateRegistrationScreenWithThirdPartyIdentifiersHidden:YES];
    }
    
    super.authType = authType;

    if (authType == MXKAuthenticationTypeLogin)
    {
        [self.submitButton setTitle:[VectorL10n authLogin] forState:UIControlStateNormal];
        [self.submitButton setTitle:[VectorL10n authLogin] forState:UIControlStateHighlighted];
    }
    else if (authType == MXKAuthenticationTypeRegister)
    {
        [self.submitButton setTitle:[VectorL10n authRegister] forState:UIControlStateNormal];
        [self.submitButton setTitle:[VectorL10n authRegister] forState:UIControlStateHighlighted];
    }
    else if (authType == MXKAuthenticationTypeForgotPassword)
    {
        if (isPasswordReseted)
        {
            [self.submitButton setTitle:[VectorL10n authReturnToLogin] forState:UIControlStateNormal];
            [self.submitButton setTitle:[VectorL10n authReturnToLogin] forState:UIControlStateHighlighted];
        }
        else
        {
            [self.submitButton setTitle:[VectorL10n authSendResetEmail] forState:UIControlStateNormal];
            [self.submitButton setTitle:[VectorL10n authSendResetEmail] forState:UIControlStateHighlighted];
        }
    }
    
    [self updateAuthInputViewVisibility];
    [self updateForgotPwdButtonVisibility];
    [self updateSoftLogoutClearDataContainerVisibility];
    [self updateSocialLoginViewVisibility];
}

- (void)setAuthInputsView:(MXKAuthInputsView *)authInputsView
{
    // Keep the current country code if any.
    if ([self.authInputsView isKindOfClass:AuthInputsView.class])
    {
        // We will reuse the current country code
        defaultCountryCode = ((AuthInputsView*)self.authInputsView).isoCountryCode;
    }
    
    // Finalize the new auth inputs view
    if ([authInputsView isKindOfClass:AuthInputsView.class])
    {
        AuthInputsView *authInputsview = (AuthInputsView*)authInputsView;
        
        // Retrieve the MCC from the SIM card information (Note: the phone book country code is not defined yet)
        NSString *countryCode = [MXKAppSettings standardAppSettings].phonebookCountryCode;
        if (!countryCode)
        {
            // If none, consider the preferred locale
            NSLocale *local = [[NSLocale alloc] initWithLocaleIdentifier:[[NSBundle mainBundle] preferredLocalizations][0]];
            if ([local respondsToSelector:@selector(countryCode)])
            {
                countryCode = local.countryCode;
            }
            
            if (!countryCode)
            {
                countryCode = defaultCountryCode;
            }
        }
        authInputsview.isoCountryCode = countryCode;
        authInputsview.delegate = self;
    }
    
    [super setAuthInputsView:authInputsView];
    
    // Restore here the actual content view height.
    // Indeed this height has been modified according to the authInputsView height in the default implementation of MXKAuthenticationViewController.
    [self refreshContentViewHeightConstraint];
    
    // the authentication indicator should be the front most view
    [self.authInputsContainerView bringSubviewToFront:self.authenticationActivityIndicatorContainerView];
}

- (void)updateAuthInputViewVisibility
{
    BOOL hideAuthInputView = NO;
    
    // Hide input view when there is only social login actions to present at login
    if ((self.authType == MXKAuthenticationTypeLogin)
        && self.currentLoginSSOFlow
        && !self.isAuthSessionContainsPasswordFlow
        && BuildSettings.authScreenShowSocialLoginSection)
    {
        hideAuthInputView = YES;
    }
    
    // Note: Registration will hide the input view in onFailureDuringMXOperation
    // if registration has been disabled.
    
    self.authInputsView.hidden = hideAuthInputView;
}

- (void)setUserInteractionEnabled:(BOOL)userInteractionEnabled
{
    super.userInteractionEnabled = userInteractionEnabled;

    // Reset
    self.navigationItem.rightBarButtonItem.enabled = YES;
    
    // Show/Hide server options
    if (_optionsContainer.hidden == userInteractionEnabled)
    {
        _optionsContainer.hidden = !userInteractionEnabled;
        
        [self refreshContentViewHeightConstraint];
    }
    
    // Update the label of the right bar button according to its actual action.
    if (!userInteractionEnabled)
    {
        // The right bar button is used to cancel the running request.
        self.navigationItem.rightBarButtonItem.title = [VectorL10n cancel];

        // Remove the potential back button.
        self.navigationItem.leftBarButtonItem = nil;
        [self.navigationItem setHidesBackButton:YES];
    }
    else
    {
        AuthInputsView *authInputsview;
        if ([self.authInputsView isKindOfClass:AuthInputsView.class])
        {
            authInputsview = (AuthInputsView*)self.authInputsView;
        }

        // The right bar button is used to switch the authentication type.
        if (self.authType == MXKAuthenticationTypeLogin)
        {
            if (!authInputsview.isSingleSignOnRequired
                && !self.softLogoutCredentials
                && BuildSettings.authScreenShowRegister)
            {
                self.navigationItem.rightBarButtonItem.title = [VectorL10n authRegister];
            }
            else
            {
                // Disable register on SSO
                self.navigationItem.rightBarButtonItem.enabled = NO;
                self.navigationItem.rightBarButtonItem.title = nil;
            }
        }
        else if (self.authType == MXKAuthenticationTypeRegister)
        {
            self.navigationItem.rightBarButtonItem.title = [VectorL10n authLogin];
            
            // Restore the back button
            if (authInputsview)
            {
                [self updateRegistrationScreenWithThirdPartyIdentifiersHidden:authInputsview.thirdPartyIdentifiersHidden];
            }
        }
        else if (self.authType == MXKAuthenticationTypeForgotPassword)
        {
            // The right bar button is used to return to login.
            self.navigationItem.rightBarButtonItem.title = [VectorL10n cancel];
        }
    }
}

- (BOOL)continueSSOLoginWithToken:(NSString*)loginToken txnId:(NSString*)txnId
{
    // The presenter isn't dismissed automatically when finishing via a deep link
    if (self.ssoAuthenticationPresenter)
    {
        [self dismissSSOAuthenticationPresenter];
    }
    
    // Check if transaction id is the same as expected
    if (loginToken &&
        txnId && self.ssoCallbackTxnId
        && [txnId isEqualToString:self.ssoCallbackTxnId])
    {
        [self loginWithToken:loginToken];
        return YES;
    }
    
    MXLogDebug(@"[AuthenticationVC] Fail to continue SSO login");
    return NO;
}

#pragma mark - Fallback URL display

- (void)showAuthenticationFallBackView:(NSString*)fallbackPage
{
    // Skip MatrixKit and use a VC instead
    if (self.softLogoutCredentials)
    {
        // Add device_id as query param of the fallback
        NSURLComponents *components = [[NSURLComponents alloc] initWithString:fallbackPage];

        NSMutableArray<NSURLQueryItem*> *queryItems = [components.queryItems mutableCopy];
        if (!queryItems)
        {
            queryItems = [NSMutableArray array];
        }

        [queryItems addObject:[NSURLQueryItem queryItemWithName:@"device_id"
                                                          value:self.softLogoutCredentials.deviceId]];

        components.queryItems = queryItems;

        fallbackPage = components.URL.absoluteString;
    }

    [self showAuthenticationFallBackViewController:fallbackPage];
}

- (void)showAuthenticationFallBackViewController:(NSString*)fallbackPage
{
    authFallBackViewController = [[AuthFallBackViewController alloc] initWithURL:fallbackPage];
    authFallBackViewController.delegate = self;


    authFallBackViewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(dismissFallBackViewController:)];

    UINavigationController *navigationController = [[RiotNavigationController alloc] initWithRootViewController:authFallBackViewController];
    [self presentViewController:navigationController animated:YES completion:nil];
}

- (void)dismissFallBackViewController:(id)sender
{
    [authFallBackViewController dismissViewControllerAnimated:YES completion:nil];
    authFallBackViewController = nil;
}


#pragma mark AuthFallBackViewControllerDelegate

- (void)authFallBackViewController:(AuthFallBackViewController *)authFallBackViewController
         didLoginWithLoginResponse:(MXLoginResponse *)loginResponse
{
    [authFallBackViewController dismissViewControllerAnimated:YES completion:^{
        
        MXCredentials *credentials = [[MXCredentials alloc] initWithLoginResponse:loginResponse andDefaultCredentials:nil];
        [self onSuccessfulLogin:credentials];
    }];

    authFallBackViewController = nil;
}


- (void)authFallBackViewControllerDidClose:(AuthFallBackViewController *)authFallBackViewController
{
    [self dismissFallBackViewController:nil];
}


- (void)setSoftLogoutCredentials:(MXCredentials *)softLogoutCredentials
{
    [super setSoftLogoutCredentials:softLogoutCredentials];
    
    if (softLogoutCredentials)
    {
        // Customise the screen for soft logout
        self.customServersTickButton.hidden = YES;
        self.navigationItem.rightBarButtonItem.title = nil;
        self.navigationItem.title = [VectorL10n authSoftlogoutSignedOut];
        [self showSoftLogoutClearDataContainer];
    }
    else
    {
        // Customise the screen for regular authentication.
        self.customServersTickButton.hidden = NO;
        [self updateRightBarButtonItem];
        self.navigationItem.title = nil;
        self.softLogoutClearDataContainer.hidden = YES;
    }
}

- (void)showSoftLogoutClearDataContainer
{
    NSMutableAttributedString *message = [[NSMutableAttributedString alloc] initWithString:[VectorL10n authSoftlogoutClearData]
                                                                                attributes:@{
                                                                                             NSFontAttributeName: [UIFont boldSystemFontOfSize:14]
                                                                                             }];
    
    [message appendAttributedString:[[NSAttributedString alloc] initWithString:@"\n\n"]];
    
    NSString *string = [NSString stringWithFormat:@"%@\n\n%@",
                        [VectorL10n authSoftlogoutClearDataMessage1],
                        [VectorL10n authSoftlogoutClearDataMessage2]];
    
    [message appendAttributedString:[[NSAttributedString alloc] initWithString:string
                                                                    attributes:@{
                                                                                 NSFontAttributeName: [UIFont systemFontOfSize:14]
                                                                                 }]];
    self.softLogoutClearDataLabel.attributedText = message;

    self.softLogoutClearDataContainer.hidden = NO;
    [self refreshContentViewHeightConstraint];
}

- (void)updateSoftLogoutClearDataContainerVisibility
{
    // Do not display it in case of forget password flow
    if (self.softLogoutCredentials && self.authType == MXKAuthenticationTypeLogin)
    {
        self.softLogoutClearDataContainer.hidden = NO;
    }
    else
    {
        self.softLogoutClearDataContainer.hidden = YES;
    }
}

/**
 Filter and prioritise flows supported by the app.

 @param authSession the auth session coming from the HS.
 @return a new auth session
 */
- (MXAuthenticationSession*)handleSupportedFlowsInAuthenticationSession:(MXAuthenticationSession *)authSession
{
    MXLoginSSOFlow *ssoFlow;
    MXLoginFlow *passwordFlow;
    NSMutableArray *supportedFlows = [NSMutableArray array];

    for (MXLoginFlow *flow in authSession.flows)
    {
        // Remove known flows we do not support
        if (![flow.type isEqualToString:kMXLoginFlowTypeToken])
        {
            MXLogDebug(@"[AuthenticationVC] handleSupportedFlowsInAuthenticationSession: Filter out flow %@", flow.type);
            [supportedFlows addObject:flow];
        }

        if ([flow.type isEqualToString:kMXLoginFlowTypePassword])
        {
            passwordFlow = flow;
        }

        if ([flow isKindOfClass:MXLoginSSOFlow.class])
        {
            MXLogDebug(@"[AuthenticationVC] handleSupportedFlowsInAuthenticationSession: Prioritise flow %@", flow.type);
            ssoFlow = (MXLoginSSOFlow *)flow;
        }
    }

    // Prioritise SSO over other flows
    if (ssoFlow)
    {
        [supportedFlows removeAllObjects];
        [supportedFlows addObject:ssoFlow];

        // If the SSO contains Identity Providers list and password
        // Display both social login and password input
        if (ssoFlow.identityProviders.count && passwordFlow)
        {
            [supportedFlows addObject:passwordFlow];
        }
    }

    if (supportedFlows.count != authSession.flows.count)
    {
        MXAuthenticationSession *updatedAuthSession = [[MXAuthenticationSession alloc] init];
        updatedAuthSession.session = authSession.session;
        updatedAuthSession.params = authSession.params;
        updatedAuthSession.flows = supportedFlows;
        return updatedAuthSession;
    }
    else
    {
        return authSession;
    }
}

- (void)refreshAuthenticationSession
{
    // Hide the social login buttons while the session refreshes
    [self hideSocialLoginView];
    [super refreshAuthenticationSession];
}

- (void)handleAuthenticationSession:(MXAuthenticationSession *)authSession withFallbackSSOFlow:(MXLoginSSOFlow *)fallbackSSOFlow
{
    // Make some cleaning from the server response according to what the app supports
    authSession = [self handleSupportedFlowsInAuthenticationSession:authSession];
    
    [super handleAuthenticationSession:authSession withFallbackSSOFlow:fallbackSSOFlow];
    
    self.currentLoginSSOFlow = [self loginSSOFlowWithProvidersFromFlows:authSession.flows] ?: fallbackSSOFlow;
    
    [self updateAuthInputViewVisibility];
    [self updateSocialLoginViewVisibility];
        
    AuthInputsView *authInputsview;
    if ([self.authInputsView isKindOfClass:AuthInputsView.class])
    {
        authInputsview = (AuthInputsView*)self.authInputsView;
        [self updateUniversalLink];
    }

    // Hide "Forgot password" and "Log in" buttons in case of SSO
    [self updateForgotPwdButtonVisibility];
    [self updateSoftLogoutClearDataContainerVisibility];

    self.submitButton.hidden = authInputsview.isSingleSignOnRequired || authInputsview.isHidden;

    // Bind ssoButton again if self.authInputsView has changed
    [authInputsview.ssoButton addTarget:self action:@selector(onButtonPressed:) forControlEvents:UIControlEventTouchUpInside];

    if (authInputsview.isSingleSignOnRequired && self.softLogoutCredentials)
    {
        // Remove submitButton so that the 2nd contraint on softLogoutClearDataContainer.top will be applied
        // That makes softLogoutClearDataContainer appear upper in the screen
        [self.submitButton removeFromSuperview];
    }
    
    [self refreshContentViewHeightConstraint];
}

- (BOOL)isAuthSessionContainsPasswordFlow
{
    BOOL containsPassword = NO;
    
    if (self.authInputsView.authSession)
    {
        containsPassword = [self containsPasswordFlowInFlows:self.authInputsView.authSession.flows];
    }
    
    return containsPassword;
}

- (BOOL)containsPasswordFlowInFlows:(NSArray<MXLoginFlow*>*)loginFlows
{
    for (MXLoginFlow *loginFlow in loginFlows)
    {
        if ([loginFlow.type isEqualToString:kMXLoginFlowTypePassword])
        {
            return YES;
        }
    }
    
    return NO;
}


- (IBAction)onPasswordVisibilityToggleButtonPressed:(UIButton *)button {
    // make sure we get the correct view and not the matrix kit superview which we don't want
    AuthInputsView* bwiAuthInputView = (AuthInputsView *)[self authInputsView];
    
    UITextField *passwordTextField = [bwiAuthInputView passWordTextField];
    [passwordTextField setSecureTextEntry:![passwordTextField isSecureTextEntry]];
    
    UIImage *eyeImage = [UIImage imageNamed:passwordTextField.isSecureTextEntry ? @"reveal_password_button" : @"hide_password_button"];
    [button setImage:eyeImage forState:UIControlStateNormal];
}

- (IBAction)onButtonPressed:(id)sender
{
    if (sender == self.customServersTickButton)
    {
        [self setCustomServerFieldsVisible:self.customServersContainer.hidden];
    }
    else if (sender == self.forgotPasswordButton)
    {
        if( [BuildSettings forgotPasswordInformationAlert] ) {
            [self presentForgotPasswordInformationAlert];
        }
        else if (!self.isIdentityServerConfigured)
        {
            UIAlertController *alert = [UIAlertController alertControllerWithTitle:[VectorL10n error]
                                                                           message:[VectorL10n authForgotPasswordErrorNoConfiguredIdentityServer]
                                                                    preferredStyle:UIAlertControllerStyleAlert];
            [alert addAction:[UIAlertAction actionWithTitle:[VectorL10n ok] style:UIAlertActionStyleDefault handler:nil]];
            [self presentViewController:alert animated:YES completion:nil];
            
            return;
        }
        else
        {
            // Update UI to reset password
            self.authType = MXKAuthenticationTypeForgotPassword;
        }
    }
    else if (sender == self.navigationItem.rightBarButtonItem)
    {
        // Check whether a request is in progress
        if (!self.userInteractionEnabled)
        {
            // Cancel the current operation
            [self cancel];
        }
        else if (self.authType == MXKAuthenticationTypeLogin)
        {
            self.authType = MXKAuthenticationTypeRegister;
            [self updateRightBarButtonItem];
        }
        else
        {
            self.authType = MXKAuthenticationTypeLogin;
            [self updateRightBarButtonItem];
        }
    }
    else if (sender == self.navigationItem.leftBarButtonItem)
    {
        if ([self.authInputsView isKindOfClass:AuthInputsView.class])
        {
            AuthInputsView *authInputsview = (AuthInputsView*)self.authInputsView;
            
            // Hide the supported 3rd party ids which may be added to the account
            authInputsview.thirdPartyIdentifiersHidden = YES;
            
            [self updateRegistrationScreenWithThirdPartyIdentifiersHidden:YES];
            
            // Show the social login buttons again if needed.
            [self updateSocialLoginViewVisibility];
            
            // Allow backward navigation in the flow again.
            [self.navigationItem setHidesBackButton:NO];
        }
    }
    else if (sender == self.submitButton)
    {
        // Handle here the second screen used to manage the 3rd party ids during the registration.
        // Except if there is an external set of parameters defined to perform a registration.
        if (self.authType == MXKAuthenticationTypeRegister && !self.externalRegistrationParameters)
        {
            // Sanity check
            if ([self.authInputsView isKindOfClass:AuthInputsView.class])
            {
                AuthInputsView *authInputsview = (AuthInputsView*)self.authInputsView;
                
                // Show the 3rd party ids screen if it is not shown yet
                if (authInputsview.areThirdPartyIdentifiersSupported && authInputsview.isThirdPartyIdentifiersHidden)
                {
                    [self dismissKeyboard];
                    
                    [self.authenticationActivityIndicator startAnimating];
                    
                    // Check parameters validity
                    NSString *errorMsg = [self.authInputsView validateParameters];
                    if (errorMsg)
                    {
                        [self onFailureDuringAuthRequest:[NSError errorWithDomain:MXKAuthErrorDomain code:0 userInfo:@{NSLocalizedDescriptionKey:errorMsg}]];
                    }
                    else
                    {
                        [self testUserRegistration:^(MXError *mxError) {
                            // We consider that a user can be registered if:
                            //   - the username is not already in use
                            if ([mxError.errcode isEqualToString:kMXErrCodeStringUserInUse])
                            {
                                MXLogDebug(@"[AuthenticationVC] User name is already use");
                                [self onFailureDuringAuthRequest:[NSError errorWithDomain:MXKAuthErrorDomain code:0 userInfo:@{NSLocalizedDescriptionKey:[VectorL10n authUsernameInUse]}]];
                            }
                            //   - the server quota limits is not reached
                            else if ([mxError.errcode isEqualToString:kMXErrCodeStringResourceLimitExceeded])
                            {
                                [self showResourceLimitExceededError:mxError.userInfo];
                            }
                            else
                            {
                                [self.authenticationActivityIndicator stopAnimating];
                                
                                // Hide the social login buttons now that a different flow has started.
                                [self hideSocialLoginView];
                                
                                // Show the supported 3rd party ids which may be added to the account
                                authInputsview.thirdPartyIdentifiersHidden = NO;
                                [self updateRegistrationScreenWithThirdPartyIdentifiersHidden:NO];
                            }
                        }];
                    }
                    
                    return;
                }
            }
        }
        
        [super onButtonPressed:sender];
    }
    else if (sender == self.skipButton)
    {
        // Reset the potential email or phone values
        if ([self.authInputsView isKindOfClass:AuthInputsView.class])
        {
            AuthInputsView *authInputsview = (AuthInputsView*)self.authInputsView;
            
            [authInputsview resetThirdPartyIdentifiers];
        }
        
        [super onButtonPressed:self.submitButton];
    }
    else if (sender == ((AuthInputsView*)self.authInputsView).ssoButton)
    {        
        [self presentDefaultSSOAuthentication];
    }
    else if (sender == self.softLogoutClearDataButton)
    {
        [self.authVCDelegate authenticationViewControllerDidRequestClearAllData:self];
    }
    else
    {
        [super onButtonPressed:sender];
    }

    [self updateSoftLogoutClearDataContainerVisibility];
}

- (void)onFailureDuringAuthRequest:(NSError *)error
{
    MXError *mxError = [[MXError alloc] initWithNSError:error];
    if ([mxError.errcode isEqualToString:kMXErrCodeStringResourceLimitExceeded])
    {
        [self showResourceLimitExceededError:mxError.userInfo];
    }
    else
    {
        [super onFailureDuringAuthRequest:error];
    }
}

- (void)onSuccessfulLogin:(MXCredentials*)credentials
{
    //  Is pin protection forced?
    if ([PinCodePreferences shared].forcePinProtection)
    {
        loginCredentials = credentials;
        
        SetPinCoordinatorViewMode viewMode = SetPinCoordinatorViewModeSetPin;
        switch (self.authType) {
            case MXKAuthenticationTypeLogin:
                viewMode = SetPinCoordinatorViewModeSetPinAfterLogin;
                break;
            case MXKAuthenticationTypeRegister:
                viewMode = SetPinCoordinatorViewModeSetPinAfterRegister;
                break;
            default:
                break;
        }
        
        SetPinCoordinatorBridgePresenter *presenter = [[SetPinCoordinatorBridgePresenter alloc] initWithSession:nil viewMode:viewMode];
        presenter.delegate = self;
        [presenter presentFrom:self animated:YES];
        self.setPinCoordinatorBridgePresenter = presenter;
        return;
    }
    
    [self afterSetPinFlowCompletedWithCredentials:credentials];
}

- (void)updateRightBarButtonItem
{
    if (self.authType == MXKAuthenticationTypeLogin)
    {
        self.navigationItem.rightBarButtonItem.title = [VectorL10n authRegister];
    }
    else
    {
        self.navigationItem.rightBarButtonItem.title = [VectorL10n authLogin];
    }
}

- (void)updateForgotPwdButtonVisibility
{
    AuthInputsView *authInputsview;
    if ([self.authInputsView isKindOfClass:AuthInputsView.class])
    {
        authInputsview = (AuthInputsView*)self.authInputsView;
    }
    
    BOOL showForgotPasswordButton = NO;

    if (BuildSettings.authScreenShowForgotPassword && authInputsview.isHidden == NO)
    {
        showForgotPasswordButton = (self.authType == MXKAuthenticationTypeLogin) && !authInputsview.isSingleSignOnRequired;
    }
    
    self.forgotPasswordButton.hidden = !showForgotPasswordButton;
}

- (void)afterSetPinFlowCompletedWithCredentials:(MXCredentials*)credentials
{
    // Check whether a third party identifiers has not been used
    if ([self.authInputsView isKindOfClass:AuthInputsView.class])
    {
        AuthInputsView *authInputsview = (AuthInputsView*)self.authInputsView;
        if (authInputsview.isThirdPartyIdentifierPending)
        {
            // Alert user
            if (alert)
            {
                [alert dismissViewControllerAnimated:NO completion:nil];
            }
            
            alert = [UIAlertController alertControllerWithTitle:[VectorL10n warning] message:[VectorL10n authAddEmailAndPhoneWarning] preferredStyle:UIAlertControllerStyleAlert];
            
            [alert addAction:[UIAlertAction actionWithTitle:[VectorL10n ok]
                                                             style:UIAlertActionStyleDefault
                                                           handler:^(UIAlertAction * action) {
                                                               
                [super onSuccessfulLogin:credentials];
                                                               
                                                           }]];
            
            [self presentViewController:alert animated:YES completion:nil];
            return;
        }
    }
    
    [super onSuccessfulLogin:credentials];
}

#pragma mark -

- (void)updateRegistrationScreenWithThirdPartyIdentifiersHidden:(BOOL)thirdPartyIdentifiersHidden
{
    self.skipButton.hidden = thirdPartyIdentifiersHidden;
    
    // Do not display the skip button if the 3PID is mandatory
    if (!thirdPartyIdentifiersHidden)
    {
        if ([self.authInputsView isKindOfClass:AuthInputsView.class])
        {
            AuthInputsView *authInputsview = (AuthInputsView*)self.authInputsView;
            if (authInputsview.isThirdPartyIdentifierRequired)
            {
                self.skipButton.hidden = YES;
            }
        }
    }
    
    self.serverOptionsContainer.hidden = !thirdPartyIdentifiersHidden
                                            || !BuildSettings.authScreenShowCustomServerOptions;
    [self refreshContentViewHeightConstraint];
    
    if (thirdPartyIdentifiersHidden)
    {
        [self.submitButton setTitle:[VectorL10n authRegister] forState:UIControlStateNormal];
        [self.submitButton setTitle:[VectorL10n authRegister] forState:UIControlStateHighlighted];
        
        self.navigationItem.leftBarButtonItem = nil;
    }
    else
    {
        [self.submitButton setTitle:[VectorL10n authSubmit] forState:UIControlStateNormal];
        [self.submitButton setTitle:[VectorL10n authSubmit] forState:UIControlStateHighlighted];
        
        UIBarButtonItem *leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:VectorL10n.back
                                                                              style:UIBarButtonItemStylePlain
                                                                             target:self
                                                                             action:@selector(onButtonPressed:)];
        self.navigationItem.leftBarButtonItem = leftBarButtonItem;
    }
}

- (void)refreshContentViewHeightConstraint
{
    [self.view layoutIfNeeded];
    
    // Refresh content view height by considering the options container display.
    CGFloat constant = self.optionsContainer.frame.origin.y + 10;
    
    if (self.authInputsView.isHidden == NO)
    {
        self.authInputContainerViewMinHeightConstraint.constant = kAuthInputContainerViewMinHeightConstraintConstant;
        self.authInputContainerViewHeightConstraint.constant = self.authInputsView.viewHeightConstraint.constant;
    }
    else
    {
        self.authInputContainerViewMinHeightConstraint.constant = 0;
        self.authInputContainerViewHeightConstraint.constant = 0;
    }
        
    // FIX: When authInputsView present recaptcha the height is not taken into account, add it manually here.
    AuthInputsView *authInputsview;
    if ([self.authInputsView isKindOfClass:AuthInputsView.class])
    {
        authInputsview = (AuthInputsView*)self.authInputsView;
        
        if (!authInputsview.recaptchaContainer.hidden)
        {
            constant+=authInputsview.frame.size.height;
        }
    }
    
    if (!self.optionsContainer.isHidden)
    {
        constant += self.serverOptionsContainer.frame.origin.y;
        
        if (!self.serverOptionsContainer.isHidden)
        {
            CGRect customServersContainerFrame = self.customServersContainer.frame;
            constant += customServersContainerFrame.origin.y;
            
            if (!self.customServersContainer.isHidden)
            {
                constant += customServersContainerFrame.size.height;
            }
            else
            {
                constant += self.customServersTickButton.frame.size.height;
            }
        }
    }

    if (!self.softLogoutClearDataContainer.isHidden)
    {
        // The soft logout clear data section adds more height
        constant += self.softLogoutClearDataContainer.frame.size.height;
    }
    
    if (self.isSocialLoginViewShown)
    {
        constant += [self socialLoginViewHeightFittingWidth:self.contentView.frame.size.width];
    }
    
    if (BuildSettings.bwiEnableRegisterInfo)
    {
        constant += 100;
    }

    self.contentViewHeightConstraint.constant = constant;
    
    [self.view layoutIfNeeded];
}

- (void)setCustomServerFieldsVisible:(BOOL)isVisible
{
    if (self.customServersContainer.isHidden != isVisible || BuildSettings.authScreenShowTestServerOptions)
    {
        return;
    }
    
    if (!isVisible)
    {
        [self.homeServerTextField resignFirstResponder];
        [self.identityServerTextField resignFirstResponder];
        
        // Report server url typed by the user as custom url.
        [self saveCustomServerInputs];
                
        // Restore default configuration
        [self setHomeServerTextFieldText:self.defaultHomeServerUrl];
        [self setIdentityServerTextFieldText:self.defaultIdentityServerUrl];
        
        [self.customServersTickButton setImage:AssetImages.selectionUntick.image forState:UIControlStateNormal];
        self.customServersContainer.hidden = YES;
        
        // Refresh content view height
        self.contentViewHeightConstraint.constant -= self.customServersContainer.frame.size.height;
    }
    else
    {
        // Load custom configuration
        NSString *customHomeServerURL = [[NSUserDefaults standardUserDefaults] objectForKey:@"customHomeServerURL"];
        if (customHomeServerURL.length)
        {
            [self setHomeServerTextFieldText:customHomeServerURL];
        }
        else
        {
            [self checkIdentityServer];
        }
        NSString *customIdentityServerURL = [[NSUserDefaults standardUserDefaults] objectForKey:@"customIdentityServerURL"];
        if (customIdentityServerURL.length)
        {
            [self setIdentityServerTextFieldText:customIdentityServerURL];
        }
        
        [self.customServersTickButton setImage:AssetImages.selectionTick.image forState:UIControlStateNormal];
        self.customServersContainer.hidden = NO;
        
        // Refresh content view height
        [self refreshContentViewHeightConstraint];

        // Scroll to display server options
        CGPoint offset = self.authenticationScrollView.contentOffset;
        offset.y += self.customServersContainer.frame.size.height;
        self.authenticationScrollView.contentOffset = offset;
    }
}

- (void)saveCustomServerInputs
{
    NSString *homeServerURL = self.homeServerTextField.text;
    if (homeServerURL.length && ![homeServerURL isEqualToString:self.defaultHomeServerUrl])
    {
        [[NSUserDefaults standardUserDefaults] setObject:homeServerURL forKey:@"customHomeServerURL"];
    }
    else
    {
        [[NSUserDefaults standardUserDefaults] removeObjectForKey:@"customHomeServerURL"];
    }
    
    NSString *identityServerURL = self.identityServerTextField.text;
    if (identityServerURL.length && ![identityServerURL isEqualToString:self.defaultIdentityServerUrl])
    {
        [[NSUserDefaults standardUserDefaults] setObject:identityServerURL forKey:@"customIdentityServerURL"];
    }
    else
    {
        [[NSUserDefaults standardUserDefaults] removeObjectForKey:@"customIdentityServerURL"];
    }
}

- (void)showResourceLimitExceededError:(NSDictionary *)errorDict
{
    MXLogDebug(@"[AuthenticationVC] showResourceLimitExceededError");

    [self showResourceLimitExceededError:errorDict onAdminContactTapped:^(NSURL *adminContactURL) {

        [[UIApplication sharedApplication] vc_open:adminContactURL completionHandler:^(BOOL success) {
           if (!success)
           {
               MXLogDebug(@"[AuthenticationVC] adminContact(%@) cannot be opened", adminContactURL);
           }
        }];
    }];
}

#pragma mark - UITextFieldDelegate

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    [self.authenticationScrollView vc_scrollTo:textField with:UIEdgeInsetsMake(-20, 0, -20, 0) animated:YES];
}

#pragma mark - KVO

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    // Override here the handling of the authInputsView height change.
    if ([@"viewHeightConstraint.constant" isEqualToString:keyPath])
    {
        // Refresh content view height by considering the updated frame of the options container.
        [self refreshContentViewHeightConstraint];
    }
    else if ([@"hidden" isEqualToString:keyPath])
    {
        UIActivityIndicatorView *indicator = (UIActivityIndicatorView*)object;
        [self.authenticationActivityIndicatorContainerView setHidden:indicator.hidden];
    }
    else
    {
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
    }
}

#pragma mark - MXKAuthenticationViewControllerDelegate

- (void)authenticationViewController:(MXKAuthenticationViewController *)authenticationViewController didLogWithUserId:(NSString *)userId
{
    self.userInteractionEnabled = NO;
    [self.authenticationActivityIndicator startAnimating];
    
    // Save customized server inputs if used
    if (!self.customServersContainer.isHidden)
    {
        [self saveCustomServerInputs];
    }
    
    MXKAccount *account = [[MXKAccountManager sharedManager] accountForUserId:userId];
    MXSession *session = account.mxSession;
    
    BOOL botCreationEnabled = [[NSUserDefaults standardUserDefaults] boolForKey:@"enableBotCreation"];
    
    // Create DM with Riot-bot on new account creation.
    if (self.authType == MXKAuthenticationTypeRegister && botCreationEnabled)
    {
        MXRoomCreationParameters *roomCreationParameters = [MXRoomCreationParameters parametersForDirectRoomWithUser:@"@riot-bot:matrix.org"];
        [session createRoomWithParameters:roomCreationParameters success:nil failure:^(NSError *error) {
            MXLogDebug(@"[AuthenticationVC] Create chat with riot-bot failed");
        }];
    }
    
    // Ask the coordinator to show the loading spinner whilst waiting.
    [self.authVCDelegate authenticationViewController:self
                                  didLoginWithSession:session
                                          andPassword:self.authInputsView.password
                                orSSOIdentityProvider:self.ssoIdentityProvider];
}

#pragma mark - MXKAuthInputsViewDelegate

- (void)authInputsView:(MXKAuthInputsView *)authInputsView presentViewController:(UIViewController*)viewControllerToPresent animated:(BOOL)animated
{
    [self dismissKeyboard];
    [self presentViewController:viewControllerToPresent animated:animated completion:nil];
}

- (void)authInputsViewDidCancelOperation:(MXKAuthInputsView *)authInputsView
{
    [self cancel];
}

- (void)authInputsView:(MXKAuthInputsView *)authInputsView autoDiscoverServerWithDomain:(NSString *)domain
{
    [self tryServerDiscoveryOnDomain:domain];
}

#pragma mark - Server discovery

- (void)tryServerDiscoveryOnDomain:(NSString *)domain
{
    autoDiscovery = [[MXAutoDiscovery alloc] initWithDomain:domain];

    MXWeakify(self);
    [autoDiscovery findClientConfig:^(MXDiscoveredClientConfig * _Nonnull discoveredClientConfig) {
        MXStrongifyAndReturnIfNil(self);

        self->autoDiscovery = nil;

        switch (discoveredClientConfig.action)
        {
            case MXDiscoveredClientConfigActionPrompt:
                [self customiseServersWithWellKnown:discoveredClientConfig.wellKnown];
                break;

            case MXDiscoveredClientConfigActionFailPrompt:
            case MXDiscoveredClientConfigActionFailError:
            {
                // Alert user
                if (self->alert)
                {
                    [self->alert dismissViewControllerAnimated:NO completion:nil];
                }

                self->alert = [UIAlertController alertControllerWithTitle:[VectorL10n authAutodiscoverInvalidResponse]
                                                                  message:nil
                                                           preferredStyle:UIAlertControllerStyleAlert];

                [self->alert addAction:[UIAlertAction actionWithTitle:[VectorL10n ok]
                                                                style:UIAlertActionStyleDefault
                                                              handler:^(UIAlertAction * action) {

                                                                  self->alert = nil;
                                                              }]];

                [self presentViewController:self->alert animated:YES completion:nil];

                break;
            }

            default:
                // Fail silently
                break;
        }

    } failure:^(NSError * _Nonnull error) {
        MXStrongifyAndReturnIfNil(self);

        self->autoDiscovery = nil;

        // Fail silently
    }];
}

- (void)customiseServersWithWellKnown:(MXWellKnown*)wellKnown
{
    if (self.customServersContainer.hidden)
    {
        // Check wellKnown data with application default servers
        // If different, use custom servers
        if (![self.defaultHomeServerUrl isEqualToString:wellKnown.homeServer.baseUrl]
            || ![self.defaultIdentityServerUrl isEqualToString:wellKnown.identityServer.baseUrl])
        {
            [self showCustomHomeserver:wellKnown.homeServer.baseUrl andIdentityServer:wellKnown.identityServer.baseUrl];
        }
    }
    else
    {
        if ([self.defaultHomeServerUrl isEqualToString:wellKnown.homeServer.baseUrl]
            && [self.defaultIdentityServerUrl isEqualToString:wellKnown.identityServer.baseUrl])
        {
            // wellKnown matches with application default servers
            // Hide custom servers
            [self setCustomServerFieldsVisible:NO];
        }
        else
        {
            NSString *customHomeServerURL = [[NSUserDefaults standardUserDefaults] objectForKey:@"customHomeServerURL"];
            NSString *customIdentityServerURL = [[NSUserDefaults standardUserDefaults] objectForKey:@"customIdentityServerURL"];

            if (![customHomeServerURL isEqualToString:wellKnown.homeServer.baseUrl]
                || ![customIdentityServerURL isEqualToString:wellKnown.identityServer.baseUrl])
            {
                // Update custom servers
                [self showCustomHomeserver:wellKnown.homeServer.baseUrl andIdentityServer:wellKnown.identityServer.baseUrl];
                [self setHomeServerTextFieldText:wellKnown.homeServer.baseUrl];
            }
        }
    }
}

- (void)showCustomHomeserver:(NSString*)homeserver andIdentityServer:(NSString*)identityServer
{
    // Store the wellknown data into NSUserDefaults before displaying them
    [[NSUserDefaults standardUserDefaults] setObject:homeserver forKey:@"customHomeServerURL"];

    if (identityServer)
    {
        [[NSUserDefaults standardUserDefaults] setObject:identityServer forKey:@"customIdentityServerURL"];
    }
    else
    {
        [[NSUserDefaults standardUserDefaults] removeObjectForKey:@"customIdentityServerURL"];
    }

    // And show custom servers
    [self setCustomServerFieldsVisible:YES];
}

-(void)displayCouldNotVerifyIdentityOfRemoteServer
{
    __weak typeof(self) weakSelf = self;
       
   [self setOnUnrecognizedCertificateBlock:^BOOL(NSData *certificate) {
   
       dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
       
       NSString *homeserverURL = weakSelf.defaultHomeServerUrl;
       
       NSString *title = [VectorL10n sslCouldNotVerify];
       NSString *homeserverURLStr = [VectorL10n sslHomeserverUrl: homeserverURL];
       NSString *fingerprint = [VectorL10n sslFingerprintHash:@"SHA256"];
       NSString *certFingerprint = [certificate mx_SHA256AsHexString];
       
       NSString *msg = [NSString stringWithFormat:@"%@\n\n%@\n\n%@\n\n%@\n\n%@\n\n%@",
                        [VectorL10n sslCertNotTrust],
                        [VectorL10n sslCertNewAccountExpl],
                        homeserverURLStr, fingerprint, certFingerprint,
                        [VectorL10n sslOnlyAccept]];
       
       UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title
                                       message:msg
                                       preferredStyle:UIAlertControllerStyleAlert];
       
       dispatch_async(dispatch_get_main_queue(), ^{
           [weakSelf presentViewController:alertController animated:YES completion:nil];
       });
       
       dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
       
       return false;
   }];
}

#pragma mark - SetPinCoordinatorBridgePresenterDelegate

- (void)setPinCoordinatorBridgePresenterDelegateDidComplete:(SetPinCoordinatorBridgePresenter *)coordinatorBridgePresenter
{
    [coordinatorBridgePresenter dismissWithAnimated:YES completion:nil];
    self.setPinCoordinatorBridgePresenter = nil;

    [self afterSetPinFlowCompletedWithCredentials:loginCredentials];
}

- (void)setPinCoordinatorBridgePresenterDelegateDidCancel:(SetPinCoordinatorBridgePresenter *)coordinatorBridgePresenter
{
    //  enable the view again
    [self setUserInteractionEnabled:YES];
    
    //  stop the spinner
    [self.authenticationActivityIndicator stopAnimating];
    
    //  then, just close the enter pin screen
    [coordinatorBridgePresenter dismissWithAnimated:YES completion:nil];
    self.setPinCoordinatorBridgePresenter = nil;
}

#pragma mark - Social login view management

- (BOOL)isSocialLoginViewShown
{
    return self.socialLoginListView.superview
    && !self.socialLoginListView.isHidden
    && self.currentLoginSSOFlow.identityProviders.count;
}

- (CGFloat)socialLoginViewHeightFittingWidth:(CGFloat)width
{
    NSArray<MXLoginSSOIdentityProvider*> *identityProviders =  self.currentLoginSSOFlow.identityProviders;
    
    if (!identityProviders.count && self.socialLoginListView)
    {
        return 0.0;
    }
    
    return [SocialLoginListView contentViewHeightWithIdentityProviders:identityProviders mode:self.socialLoginListView.mode fitting:self.contentView.frame.size.width];
}

- (void)showSocialLoginViewWithLoginSSOFlow:(MXLoginSSOFlow*)loginSSOFlow andMode:(SocialLoginButtonMode)mode
{
    SocialLoginListView *listView = self.socialLoginListView;
    
    if (!listView)
    {
        listView = [SocialLoginListView instantiate];
        [self.socialLoginContainerView vc_addSubViewMatchingParent:listView];
        self.socialLoginListView = listView;
        listView.delegate = self;
    }
    
    [listView updateWith:loginSSOFlow.identityProviders mode:mode];
    
    [self refreshContentViewHeightConstraint];
}

- (void)hideSocialLoginView
{
    [self.socialLoginListView removeFromSuperview];
    [self refreshContentViewHeightConstraint];
}

- (void)updateSocialLoginViewVisibility
{
    SocialLoginButtonMode socialLoginButtonMode = SocialLoginButtonModeContinue;

    BOOL showSocialLoginView = BuildSettings.authScreenShowSocialLoginSection && (self.currentLoginSSOFlow ? YES : NO);
    
    switch (self.authType)
    {
        case MXKAuthenticationTypeForgotPassword:
            showSocialLoginView = NO;
            break;
        case MXKAuthenticationTypeRegister:
            socialLoginButtonMode = SocialLoginButtonModeSignUp;
            break;
        case MXKAuthenticationTypeLogin:
            if (((AuthInputsView*)self.authInputsView).isSingleSignOnRequired)
            {
                socialLoginButtonMode = SocialLoginButtonModeContinue;
            }
            else
            {
                socialLoginButtonMode = SocialLoginButtonModeSignIn;
            }
            break;
        default:
            break;
    }
    
    if (showSocialLoginView)
    {
        [self showSocialLoginViewWithLoginSSOFlow:self.currentLoginSSOFlow andMode:socialLoginButtonMode];
    }
    else
    {
        [self hideSocialLoginView];
    }
}

#pragma mark - SocialLoginListViewDelegate

- (void)socialLoginListView:(SocialLoginListView *)socialLoginListView didTapSocialButtonWithProvider:(SSOIdentityProvider *)identityProvider
{
    [self presentSSOAuthenticationForIdentityProvider:identityProvider];
}

#pragma mark - SSOIdentityProviderAuthenticationPresenter

- (void)presentSSOAuthenticationForIdentityProvider:(SSOIdentityProvider*)identityProvider
{
    NSString *homeServerStringURL = self.homeServerTextField.text;
    
    if (!homeServerStringURL)
    {
        return;
    }
    
    SSOAuthenticationService *ssoAuthenticationService = [[SSOAuthenticationService alloc] initWithHomeserverStringURL:homeServerStringURL];
    
    SSOAuthenticationPresenter *presenter = [[SSOAuthenticationPresenter alloc] initWithSsoAuthenticationService:ssoAuthenticationService];
    
    presenter.delegate = self;
    
    // Generate a unique identifier that will identify the success callback URL
    NSString *transactionId = [MXTools generateTransactionId];
    
    [presenter presentForIdentityProvider:identityProvider with: transactionId from:self animated:YES];
    
    self.ssoCallbackTxnId = transactionId;
    self.ssoAuthenticationPresenter = presenter;
}

- (void)presentDefaultSSOAuthentication
{
    [self presentSSOAuthenticationForIdentityProvider:nil];
}

- (void)dismissSSOAuthenticationPresenter
{
    [self.ssoAuthenticationPresenter dismissWithAnimated:YES completion:nil];
    self.ssoAuthenticationPresenter = nil;
}

// TODO: Move to SDK
- (void)loginWithToken:(NSString*)loginToken
{
    NSDictionary *parameters = @{
        @"type" : kMXLoginFlowTypeToken,
        @"token": loginToken
    };
    
    [self loginWithParameters:parameters];
}

#pragma mark - SSOAuthenticationPresenterDelegate

- (void)ssoAuthenticationPresenterDidCancel:(SSOAuthenticationPresenter *)presenter
{
    [self dismissSSOAuthenticationPresenter];
}

- (void)ssoAuthenticationPresenter:(SSOAuthenticationPresenter *)presenter authenticationDidFailWithError:(NSError *)error
{
    [self dismissSSOAuthenticationPresenter];
    [self.errorPresenter presentErrorFromViewController:self forError:error animated:YES handler:nil];
}

- (void)ssoAuthenticationPresenter:(SSOAuthenticationPresenter *)presenter
  authenticationSucceededWithToken:(NSString *)token
             usingIdentityProvider:(SSOIdentityProvider * _Nullable)identityProvider
{
    self.ssoIdentityProvider = identityProvider;
    [self dismissSSOAuthenticationPresenter];
    [self loginWithToken:token];
}

#pragma mark - bwi Extentions

// rotermund: As the goal is to be as less invasive as possible, I use the textfields provided by New Vector as business logic. To make this look nicer I would have to make changes in e.g. updateRestClient

- (void) enableTestServerControl {
    for (UIView *view in self.customServersContainer.subviews) {
        view.hidden = YES;
    }
    self.customServersTickButton.hidden = YES;
    self.customServersContainer.hidden = NO;
    
    if (@available(iOS 14.0, *)) {
        self.bwServerOptionsLabel = [[UILabel alloc] initWithFrame:CGRectMake(40, 60, 200, 30)];
        self.bwServerOptionsLabel.text = NSLocalizedStringFromTable(@"bwi_auth_beta_selection_title", @"Bwi", nil);
//        [self.customServersContainer addSubview:self.bwServerOptionsLabel];
         
        self.homeServerTextField = [self serverSelectionTextField];
        
        self.bwServerPreSelectionButton = [self serverSelectionButton];
        [self.customServersContainer addSubview:self.bwServerPreSelectionButton];
    } else {
        NSArray *itemArray = [NSArray arrayWithObjects: @"Produktion", @"MSG", @"UAT", nil];

        self.bwServerOptionsControl = [[UISegmentedControl alloc] initWithItems:itemArray];
        self.bwServerOptionsControl.frame = CGRectMake(40, 90, self.customServersContainer.frame.size.width-80, 30);
        [self.bwServerOptionsControl addTarget:self action:@selector(serverOptionsControlChanged:) forControlEvents: UIControlEventValueChanged];
        self.bwServerOptionsControl.selectedSegmentIndex = 0;
        
        [self.customServersContainer addSubview:self.bwServerOptionsControl];
        
        self.bwServerOptionsLabel = [[UILabel alloc] initWithFrame:CGRectMake(40, 60, 200, 30)];
        self.bwServerOptionsLabel.text = NSLocalizedStringFromTable(@"bwi_auth_beta_selection_title", @"Bwi", nil);
//        [self.customServersContainer addSubview:self.bwServerOptionsLabel];
        self.customServersContainer.hidden = NO;
    }
}

- (void) enableRegisterButton {
    self.bwRegisterButton = [UIButton buttonWithType:UIButtonTypeSystem];
    
    NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    paragraphStyle.alignment = NSTextAlignmentCenter;
    NSMutableAttributedString *registerString = [[NSMutableAttributedString alloc] initWithString:NSLocalizedStringFromTable(@"bwi_auth_register_button_title", @"Vector", nil) attributes: @{NSParagraphStyleAttributeName:paragraphStyle}];
    [registerString addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:NSMakeRange(0, [registerString length])];

    [self.bwRegisterButton setAttributedTitle:registerString forState:UIControlStateNormal];
    [self.bwRegisterButton setTitleColor:ThemeService.shared.theme.tintColor forState:UIControlStateNormal];
    
    [self.bwRegisterButton addTarget:self action:@selector(bwiOnRegisterButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
       
    [self.optionsContainer addSubview:self.bwRegisterButton];
    [self.optionsContainer bringSubviewToFront:self.bwRegisterButton];
}

- (UITextField*)serverSelectionTextField {
   UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(40, 90, self.customServersContainer.frame.size.width-80, 30)];
    textField.text = BuildSettings.serverConfigPreSelections[@"Prod"];
    textField.borderStyle = UITextBorderStyleRoundedRect;
    textField.font = [UIFont systemFontOfSize:15];
    textField.placeholder = @"enter text";
    textField.autocorrectionType = UITextAutocorrectionTypeNo;
    textField.keyboardType = UIKeyboardTypeDefault;
    textField.returnKeyType = UIReturnKeyDone;
    textField.clearButtonMode = UITextFieldViewModeWhileEditing;
    textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
    textField.delegate = self;
    
    [self.customServersContainer addSubview:textField];
    
    return textField;
}

- (UIButton*)serverSelectionButton {

    if (@available(iOS 14.0, *)) {
        NSMutableArray* actions = [[NSMutableArray alloc] init];
        
        for (ServerSetting* setting in ServerURLHelper.shared.serverSettings) {
            [actions addObject:[UIAction actionWithTitle:setting.name image:nil identifier:nil handler:^(__kindof UIAction* _Nonnull action) {
                [self setHomeServerTextFieldText:setting.serverUrl];
            }]];
        }
        
        UIMenu* menu = [UIMenu menuWithChildren:actions];
            
        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        button.menu = menu;
        button.showsMenuAsPrimaryAction = true;
        
        button.frame = CGRectMake(40, 120, self.customServersContainer.frame.size.width-80, 30);
        [button setTitle:NSLocalizedStringFromTable(@"bwi_auth_beta_selection_button_title", @"Bwi", nil) forState:UIControlStateNormal];
        button.titleLabel.textColor = ThemeService.shared.theme.textPrimaryColor;
        button.backgroundColor = ThemeService.shared.theme.tintColor;
        
        return button;
    } else {
        return nil;
    }
}

- (void)serverOptionsControlChanged:(UISegmentedControl *)segment
{
    
    switch (segment.selectedSegmentIndex) {
        case 0:
            [self setHomeServerTextFieldText:BuildSettings.serverConfigPreSelections[@"Prod"]];
            [self setHomeServerTextFieldText:BuildSettings.serverConfigPreSelections[@"Prod"]];
            break;
        case 1:
            [self setHomeServerTextFieldText:BuildSettings.serverConfigPreSelections[@"MSGDemo"]];
            [self setHomeServerTextFieldText:BuildSettings.serverConfigPreSelections[@"MSGDemo"]];
            break;
        case 2:
            [self setHomeServerTextFieldText:BuildSettings.serverConfigPreSelections[@"UAT"]];
            [self setHomeServerTextFieldText:BuildSettings.serverConfigPreSelections[@"UAT"]];
            break;
        case 3:
            [self setHomeServerTextFieldText:BuildSettings.serverConfigPreSelections[@"Lab23"]];
            [self setHomeServerTextFieldText:BuildSettings.serverConfigPreSelections[@"Lab23"]];
            break;
        default:
            break;
    }
}

- (void) bwiOnRegisterButtonPressed:(id)sender {
    [self bwiPresentRegisterInformationAlert];
}

- (void) bwiPresentRegisterInformationAlert
{
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:NSLocalizedStringFromTable(@"bwi_auth_register_alert_title", @"Vector", nil)
                                                                   message:NSLocalizedStringFromTable(@"bwi_auth_register_alert_text", @"Vector", nil)
                                                            preferredStyle:UIAlertControllerStyleAlert];
    [alert addAction:[UIAlertAction actionWithTitle:[VectorL10n ok] style:UIAlertActionStyleDefault handler:nil]];
    [self presentViewController:alert animated:YES completion:nil];
}

@end