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// SecureTextEntryManager.m
// Notation
// Created by Zachary Schneirov on 1/5/11.
/*Copyright (c) 2010, Zachary Schneirov. All rights reserved.
This file is part of Notational Velocity.
Notational Velocity is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Notational Velocity is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Notational Velocity. If not, see <>. */
#import "SecureTextEntryManager.h"
#include <Carbon/Carbon.h>
NSString *ShouldHideSecureTextEntryWarningKey = @"ShouldHideSecureTextEntryWarning";
static SecureTextEntryManager *sharedInstance = nil;
@implementation SecureTextEntryManager
+ (SecureTextEntryManager*)sharedInstance {
//not synchronized because there should be no need for non-main threads to access this class
//also, NSThread access potentially enables a locking
if (sharedInstance == nil)
sharedInstance = [[SecureTextEntryManager alloc] init];
return sharedInstance;
+ (id)allocWithZone:(NSZone *)zone {
if (sharedInstance == nil) {
sharedInstance = [super allocWithZone:zone];
return sharedInstance; // assignment and return on first allocation
return nil; // on subsequent allocation attempts return nil
- (id)init {
if ((self = [super init])) {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidBecomeActive:)
name:NSApplicationDidBecomeActiveNotification object:NSApp];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationWillResignActive:)
name:NSApplicationWillResignActiveNotification object:NSApp];
return self;
- (void)applicationDidBecomeActive:(NSNotification *)aNotification {
if (secureTextEntry) {
[self _enableSecureEventInput];
- (void)applicationWillResignActive:(NSNotification *)aNotification {
if (secureTextEntry) {
[self _disableSecureEventInput];
//_enableSecureEventInput/_disableSecureEventInput are private; do not call them directly
- (void)_enableSecureEventInput {
if (!_calledSecureEventInput) {
NSAssert([NSApp isActive], @"not fair; app is currently inactive");
//could also assert -[NSThread isMainThread] here
_calledSecureEventInput = YES;
//NSLog(@"%s: enabled secure input", _cmd);
- (void)_disableSecureEventInput {
if (_calledSecureEventInput) {
//NSLog(@"%s: disabled secure input", _cmd);
_calledSecureEventInput = NO;
if (IsSecureEventInputEnabled())
NSLog(@"%s: WARNING: secure input is still enabled, possibly by another app", _cmd);
//these enable/disable methods refer to the behavior of calling EnableSecureEventInput/DisableSecureEventInput;
//rather than being wrappers for those calls themselves
- (void)disableSecureTextEntry {
if (secureTextEntry) {
[self _disableSecureEventInput];
secureTextEntry = NO;
- (void)enableSecureTextEntry {
if (!secureTextEntry) {
//should do -[checkForIncompatibleApps] here, but that would add about 0.056 seconds of latency to launch time
if ([NSApp isActive]) {
[self _enableSecureEventInput];
secureTextEntry = YES;
- (NSSet*)_bundleIdentifiersOfIncompatibleApps {
return [NSSet setWithObjects:@"com.smileonmymac.textexpander", @"com.macility.typinator2", @"com.typeit4me.TypeIt4MeMenu", @"", @"", nil];
- (void)checkForIncompatibleApps {
if (!secureTextEntry || [[NSUserDefaults standardUserDefaults] boolForKey:ShouldHideSecureTextEntryWarningKey])
NSSet *identifiers = [self _bundleIdentifiersOfIncompatibleApps];
ProcessSerialNumber PSN = { 0, kNoProcess };
//walk through processes using the carbon process manager, because this is what NSWorkspace's launchedApplications method does, anyway, and we get hidden processes as well
while (GetNextProcess(&PSN) == noErr) {
CFDictionaryRef infoDict = ProcessInformationCopyDictionary(&PSN, kProcessDictionaryIncludeAllInformationMask);
if (infoDict != NULL) {
CFTypeRef identifier = CFDictionaryGetValue(infoDict, kCFBundleIdentifierKey);
if ((identifier != NULL) && [identifiers containsObject:(id)identifier]) {
CFStringRef offendingAppName = CFDictionaryGetValue(infoDict, kCFBundleNameKey);
NSAlert *alert = [NSAlert alertWithMessageText:
[NSString stringWithFormat:NSLocalizedString(@"Secure Text Entry will prevent %@, which is currently installed on this computer, from working in Notational Velocity.",
@"for warning about incompatibility with TextExpander, Typinator, etc."), offendingAppName]
defaultButton:NSLocalizedString(@"OK", nil) alternateButton:nil otherButton:nil informativeTextWithFormat:@""];
if (IsLeopardOrLater) {
[alert setShowsSuppressionButton:YES];
[alert runModal];
if (IsLeopardOrLater && [[alert suppressionButton] state] == NSOnState) {
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:ShouldHideSecureTextEntryWarningKey];
- (id)copyWithZone:(NSZone *)zone {
return self;
- (id)retain {
return self;
- (NSUInteger)retainCount {
return UINT_MAX; // denotes an object that cannot be released
- (void)release {
//do nothing
- (id)autorelease {
return self;
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