├── .gitignore
├── DTSHashedContacts.xcodeproj
    ├── project.pbxproj
    └── project.xcworkspace
    │   └── contents.xcworkspacedata
├── DTSHashedContacts
    ├── DTSAppDelegate.h
    ├── DTSAppDelegate.m
    ├── DTSHashedContacts-Info.plist
    ├── DTSHashedContacts-Prefix.pch
    ├── DTSViewController.h
    ├── DTSViewController.m
    ├── en.lproj
    │   ├── DTSViewController.xib
    │   └── InfoPlist.strings
    └── main.m
├── LICENSE
├── README.markdown
├── Source
    ├── DTSHashedContactsProvider.h
    ├── DTSHashedContactsProvider.m
    ├── de.lproj
    │   └── Localizable.strings
    ├── en.lproj
    │   └── Localizable.strings
    └── nl.lproj
    │   └── Localizable.strings
└── alert_example.png


/.gitignore:
--------------------------------------------------------------------------------
 1 | # xcode noise
 2 | *.mode1v3
 3 | *.pbxuser
 4 | *.perspective 
 5 | *.perspectivev3
 6 | *.pyc 
 7 | *~.nib/
 8 | */build/*
 9 | 
10 | # osx noise
11 | .DS_Store
12 | profile
13 | 
14 | # Xcode4 User Data
15 | */xcuserdata
16 | */*/xcuserdata
17 | */*/*/xcuserdata
18 | 


--------------------------------------------------------------------------------
/DTSHashedContacts.xcodeproj/project.pbxproj:
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268 | 				OTHER_CFLAGS = "-DNS_BLOCK_ASSERTIONS=1";
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270 | 				VALIDATE_PRODUCT = YES;
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280 | 				IPHONEOS_DEPLOYMENT_TARGET = 4.0;
281 | 				PRODUCT_NAME = "$(TARGET_NAME)";
282 | 				WRAPPER_EXTENSION = app;
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292 | 				IPHONEOS_DEPLOYMENT_TARGET = 4.0;
293 | 				PRODUCT_NAME = "$(TARGET_NAME)";
294 | 				WRAPPER_EXTENSION = app;
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305 | 				E2E8476A14EC008600DADB76 /* Release */,
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314 | 				E2E8476D14EC008600DADB76 /* Release */,
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322 | }
323 | 


--------------------------------------------------------------------------------
/DTSHashedContacts.xcodeproj/project.xcworkspace/contents.xcworkspacedata:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <Workspace
3 |    version = "1.0">
4 |    <FileRef
5 |       location = "self:DTSHashedContacts.xcodeproj">
6 |    </FileRef>
7 | </Workspace>
8 | 


--------------------------------------------------------------------------------
/DTSHashedContacts/DTSAppDelegate.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  DTSAppDelegate.h
 3 | //  DTSHashedContacts
 4 | //
 5 | //  Created by David Smith on 2/15/12.
 6 | //  Copyright (c) 2012 Cross Forward Consulting, LLC. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | @class DTSViewController;
12 | 
13 | @interface DTSAppDelegate : UIResponder <UIApplicationDelegate>
14 | 
15 | @property (strong, nonatomic) UIWindow *window;
16 | 
17 | @property (strong, nonatomic) DTSViewController *viewController;
18 | 
19 | @end
20 | 


--------------------------------------------------------------------------------
/DTSHashedContacts/DTSAppDelegate.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  DTSAppDelegate.m
 3 | //  DTSHashedContacts
 4 | //
 5 | //  Created by David Smith on 2/15/12.
 6 | //  Copyright (c) 2012 Cross Forward Consulting, LLC. All rights reserved.
 7 | //
 8 | 
 9 | #import "DTSAppDelegate.h"
10 | 
11 | #import "DTSViewController.h"
12 | 
13 | @implementation DTSAppDelegate
14 | 
15 | @synthesize window = _window;
16 | @synthesize viewController = _viewController;
17 | 
18 | - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
19 | {
20 |     self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
21 |     // Override point for customization after application launch.
22 |     self.viewController = [[DTSViewController alloc] initWithNibName:@"DTSViewController" bundle:nil];
23 |     self.window.rootViewController = self.viewController;
24 |     [self.window makeKeyAndVisible];
25 |     return YES;
26 | }
27 | 
28 | - (void)applicationWillResignActive:(UIApplication *)application
29 | {
30 |     /*
31 |      Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
32 |      Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
33 |      */
34 | }
35 | 
36 | - (void)applicationDidEnterBackground:(UIApplication *)application
37 | {
38 |     /*
39 |      Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. 
40 |      If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
41 |      */
42 | }
43 | 
44 | - (void)applicationWillEnterForeground:(UIApplication *)application
45 | {
46 |     /*
47 |      Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
48 |      */
49 | }
50 | 
51 | - (void)applicationDidBecomeActive:(UIApplication *)application
52 | {
53 |     /*
54 |      Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
55 |      */
56 | }
57 | 
58 | - (void)applicationWillTerminate:(UIApplication *)application
59 | {
60 |     /*
61 |      Called when the application is about to terminate.
62 |      Save data if appropriate.
63 |      See also applicationDidEnterBackground:.
64 |      */
65 | }
66 | 
67 | @end
68 | 


--------------------------------------------------------------------------------
/DTSHashedContacts/DTSHashedContacts-Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>en</string>
 7 | 	<key>CFBundleDisplayName</key>
 8 | 	<string>${PRODUCT_NAME}</string>
 9 | 	<key>CFBundleExecutable</key>
10 | 	<string>${EXECUTABLE_NAME}</string>
11 | 	<key>CFBundleIconFiles</key>
12 | 	<array/>
13 | 	<key>CFBundleIdentifier</key>
14 | 	<string>org.david-smith.${PRODUCT_NAME:rfc1034identifier}</string>
15 | 	<key>CFBundleInfoDictionaryVersion</key>
16 | 	<string>6.0</string>
17 | 	<key>CFBundleName</key>
18 | 	<string>${PRODUCT_NAME}</string>
19 | 	<key>CFBundlePackageType</key>
20 | 	<string>APPL</string>
21 | 	<key>CFBundleShortVersionString</key>
22 | 	<string>1.0</string>
23 | 	<key>CFBundleSignature</key>
24 | 	<string>????</string>
25 | 	<key>CFBundleVersion</key>
26 | 	<string>1.0</string>
27 | 	<key>LSRequiresIPhoneOS</key>
28 | 	<true/>
29 | 	<key>UIRequiredDeviceCapabilities</key>
30 | 	<array>
31 | 		<string>armv7</string>
32 | 	</array>
33 | 	<key>UISupportedInterfaceOrientations</key>
34 | 	<array>
35 | 		<string>UIInterfaceOrientationPortrait</string>
36 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
37 | 		<string>UIInterfaceOrientationLandscapeRight</string>
38 | 	</array>
39 | </dict>
40 | </plist>
41 | 


--------------------------------------------------------------------------------
/DTSHashedContacts/DTSHashedContacts-Prefix.pch:
--------------------------------------------------------------------------------
 1 | //
 2 | // Prefix header for all source files of the 'DTSHashedContacts' target in the 'DTSHashedContacts' project
 3 | //
 4 | 
 5 | #import <Availability.h>
 6 | 
 7 | #ifndef __IPHONE_4_0
 8 | #warning "This project uses features only available in iOS SDK 4.0 and later."
 9 | #endif
10 | 
11 | #ifdef __OBJC__
12 |     #import <UIKit/UIKit.h>
13 |     #import <Foundation/Foundation.h>
14 | #endif
15 | 


--------------------------------------------------------------------------------
/DTSHashedContacts/DTSViewController.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  DTSViewController.h
 3 | //  DTSHashedContacts
 4 | //
 5 | //  Created by David Smith on 2/15/12.
 6 | //  Copyright (c) 2012 Cross Forward Consulting, LLC. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | #import "DTSHashedContactsProvider.h"
11 | 
12 | @interface DTSViewController : UIViewController
13 | 
14 | @property (strong) IBOutlet UITextView* allTokensView;
15 | 
16 | @property (strong) DTSHashedContactsProvider* hashedContactsProvider;
17 | 
18 | -(IBAction)requestEmailTokens:(id)sender;
19 | -(IBAction)requestPhoneNumberTokens:(id)sender;
20 | -(IBAction)resetConfirmation:(id)sender;
21 | 
22 | @end
23 | 


--------------------------------------------------------------------------------
/DTSHashedContacts/DTSViewController.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  DTSViewController.m
 3 | //  DTSHashedContacts
 4 | //
 5 | //  Created by David Smith on 2/15/12.
 6 | //  Copyright (c) 2012 Cross Forward Consulting, LLC. All rights reserved.
 7 | //
 8 | 
 9 | #import "DTSViewController.h"
10 | 
11 | @implementation DTSViewController
12 | 
13 | @synthesize allTokensView, hashedContactsProvider;
14 | 
15 | -(void)viewDidLoad {
16 |     self.hashedContactsProvider = [[DTSHashedContactsProvider alloc] init];
17 |     self.hashedContactsProvider.hashingMethod = DTSHashWithSHA512;
18 | }
19 | 
20 | -(IBAction)requestEmailTokens:(id)sender {
21 |     [self.hashedContactsProvider
22 |      emailTokensWithConfirmation:^(NSArray* tokens) {
23 |          
24 |          if([tokens count] > 0) {
25 |              allTokensView.text = [tokens componentsJoinedByString:@"\n\n"];
26 |          } else {
27 |              allTokensView.text = @"No Contacts";
28 |          }
29 |          
30 |      } whenDeclined:^{
31 |          allTokensView.text = @"Declined";
32 |      }];
33 | }
34 | -(IBAction)requestPhoneNumberTokens:(id)sender {
35 |     [self.hashedContactsProvider
36 |      phoneNumberTokensWithConfirmation:^(NSArray* tokens) {
37 |          
38 |          if([tokens count] > 0) {
39 |              allTokensView.text = [tokens componentsJoinedByString:@"\n\n"];
40 |          } else {
41 |              allTokensView.text = @"No Contacts";
42 |          }
43 |          
44 |      } whenDeclined:^{
45 |          allTokensView.text = @"Declined";
46 |      }];
47 | }
48 | 
49 | 
50 | -(IBAction)resetConfirmation:(id)sender {
51 |     [self.hashedContactsProvider resetConfirmationAlerts];
52 | }
53 | 
54 | @end
55 | 


--------------------------------------------------------------------------------
/DTSHashedContacts/en.lproj/DTSViewController.xib:
--------------------------------------------------------------------------------
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312 | 						<string key="requestEmailTokens:">id</string>
313 | 						<string key="requestPhoneNumberTokens:">id</string>
314 | 						<string key="resetConfirmation:">id</string>
315 | 					</dictionary>
316 | 					<dictionary class="NSMutableDictionary" key="actionInfosByName">
317 | 						<object class="IBActionInfo" key="requestEmailTokens:">
318 | 							<string key="name">requestEmailTokens:</string>
319 | 							<string key="candidateClassName">id</string>
320 | 						</object>
321 | 						<object class="IBActionInfo" key="requestPhoneNumberTokens:">
322 | 							<string key="name">requestPhoneNumberTokens:</string>
323 | 							<string key="candidateClassName">id</string>
324 | 						</object>
325 | 						<object class="IBActionInfo" key="resetConfirmation:">
326 | 							<string key="name">resetConfirmation:</string>
327 | 							<string key="candidateClassName">id</string>
328 | 						</object>
329 | 					</dictionary>
330 | 					<object class="NSMutableDictionary" key="outlets">
331 | 						<string key="NS.key.0">allTokensView</string>
332 | 						<string key="NS.object.0">UITextView</string>
333 | 					</object>
334 | 					<object class="NSMutableDictionary" key="toOneOutletInfosByName">
335 | 						<string key="NS.key.0">allTokensView</string>
336 | 						<object class="IBToOneOutletInfo" key="NS.object.0">
337 | 							<string key="name">allTokensView</string>
338 | 							<string key="candidateClassName">UITextView</string>
339 | 						</object>
340 | 					</object>
341 | 					<object class="IBClassDescriptionSource" key="sourceIdentifier">
342 | 						<string key="majorKey">IBProjectSource</string>
343 | 						<string key="minorKey">./Classes/DTSViewController.h</string>
344 | 					</object>
345 | 				</object>
346 | 			</array>
347 | 		</object>
348 | 		<int key="IBDocument.localizationMode">0</int>
349 | 		<string key="IBDocument.TargetRuntimeIdentifier">IBCocoaTouchFramework</string>
350 | 		<bool key="IBDocument.PluginDeclaredDependenciesTrackSystemTargetVersion">YES</bool>
351 | 		<int key="IBDocument.defaultPropertyAccessControl">3</int>
352 | 		<string key="IBCocoaTouchPluginVersion">933</string>
353 | 	</data>
354 | </archive>
355 | 


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/DTSHashedContacts/en.lproj/InfoPlist.strings:
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1 | /* Localized versions of Info.plist keys */
2 | 
3 | 


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/DTSHashedContacts/main.m:
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 1 | //
 2 | //  main.m
 3 | //  DTSHashedContacts
 4 | //
 5 | //  Created by David Smith on 2/15/12.
 6 | //  Copyright (c) 2012 Cross Forward Consulting, LLC. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | #import "DTSAppDelegate.h"
12 | 
13 | int main(int argc, char *argv[])
14 | {
15 |     @autoreleasepool {
16 |         return UIApplicationMain(argc, argv, nil, NSStringFromClass([DTSAppDelegate class]));
17 |     }
18 | }
19 | 


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/LICENSE:
--------------------------------------------------------------------------------
 1 | Licensed under the MIT – No Open Source License
 2 | 
 3 | Copyright (c) 2012 David Smith
 4 | 
 5 | Permission is hereby granted, free of charge, to any person (except for ) obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 6 | 
 7 | The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 8 | 
 9 | Under no circumstances shall be granted use of this software, source code, documentation or other related material. Persons dealing in the Software agree not to knowingly distribute these materials or any derivative works to .
10 | 
11 | THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
12 | 
13 | 


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/README.markdown:
--------------------------------------------------------------------------------
 1 | ## Hashed Contacts
 2 | 
 3 | Hashed Contacts is a drop-in iOS library that provides a wrapper around the Address Book frameworks designed to ensure the privacy of user data.  It does this in two ways:
 4 | 
 5 | 1. Before access is ever made to the Address Book the user will first be prompted for permission
 6 | 1. Once access is granted the library returns hashed tokens representing the user's private data rather than the data itself.
 7 | 
 8 | These two steps do much to establish user trust with how you treat their data.
 9 | 
10 | ## Installation
11 | 
12 | Copy the contents of the `Source` directory into your project.  This will include the two main files `DTSHashedContactsProvider.m` and `DTSHashedContactsProvider.h` in addition to the localization files.
13 | 
14 | Add the `AddressBook.framework` to your project.
15 | 
16 | __Supports iOS 4.0 and above__
17 | 
18 | Replace the value of `DTSHashSALT` in `DTSHashedContactsProvider.m` and remove the warning.
19 | 
20 | ## Usage
21 | 
22 | See a full working example of how this library can be used by opening the included in this repository.
23 | 
24 | To use the library simply initialize an instance of the `DTSHashedContactsProvider` class.  _Note:_ You will need to retain a reference to this instance until you are done loading the user's data.
25 | 
26 | You may configure this in three ways:
27 | 
28 | 1. Choose the hashing method used via the `hashingMethod` property.  Options are SHA1 and SHA512
29 | 1. Specify the alert title via the `alertTitle` property
30 | 1. Specify the alert message via the `alertMessage` property
31 | 
32 | A default value for the alert is provided based on the application display name.
33 | 
34 | ![](https://github.com/crossforward/HashedContacts/raw/master/alert_example.png)
35 | 
36 | Once that is done simply call the desired retrieval method to get your tokens.
37 | 
38 |     [hashedContactsProvider emailTokensWithConfirmation:^(NSArray* tokens) {
39 |     //When permission given
40 |     } whenDeclined:^{
41 |     //When permission denied
42 |     }];
43 | 
44 | The result provided in `tokens` will look like this:
45 | 
46 | `[@"eca7cf4a5981108abb6e2b9754c96b62e6c241db",@"a927a7e701521fd46b89db0162a05c1159cbd2aa"]`
47 | 


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/Source/DTSHashedContactsProvider.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  DTSHashedContacts.h
 3 | //  DTSHashedContacts
 4 | //
 5 | //  Created by David Smith on 2/15/12.
 6 | //  Copyright (c) 2012 Cross Forward Consulting, LLC. All rights reserved.
 7 | //
 8 | 
 9 | #import <Foundation/Foundation.h>
10 | 
11 | typedef void (^DTSConfirmationBlock)(NSArray* tokens);
12 | typedef void (^DTSDeclinedBlock)(void);
13 | 
14 | typedef enum _DTSHashMethod {
15 | 	DTSHashWithSHA1 = 0,
16 | 	DTSHashWithSHA512 = 1,
17 | } DTSHashMethod;
18 | 
19 | 
20 | @interface DTSHashedContactsProvider : NSObject <UIAlertViewDelegate>
21 | 
22 | //Request tokens for contact fields.  A Confirmation will show asking the user for permission
23 | -(void)emailTokensWithConfirmation:(DTSConfirmationBlock)confirmed whenDeclined:(DTSDeclinedBlock)declined;
24 | -(void)phoneNumberTokensWithConfirmation:(DTSConfirmationBlock)confirmed whenDeclined:(DTSDeclinedBlock)declined;
25 | 
26 | //Tokenize the given string using the current hashing setup
27 | -(NSString*)tokenForString:(NSString*)string;
28 | 
29 | //The user will be prompted to give permission before access to addressbook is granted
30 | -(BOOL)userHasGivenPermission;
31 | -(void)resetConfirmationAlerts;
32 | 
33 | //Choose an option from DTSHashMethod to use for hashing
34 | @property DTSHashMethod hashingMethod;
35 | @property (strong) NSString* alertTitle;
36 | @property (strong) NSString* alertMessage;
37 | 
38 | @end
39 | 


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/Source/DTSHashedContactsProvider.m:
--------------------------------------------------------------------------------
  1 | //
  2 | //  DTSHashedContacts.m
  3 | //  DTSHashedContacts
  4 | //
  5 | //  Created by David Smith on 2/15/12.
  6 | //  Copyright (c) 2012 Cross Forward Consulting, LLC. All rights reserved.
  7 | //
  8 | 
  9 | #import "DTSHashedContactsProvider.h"
 10 | #import <AddressBook/AddressBook.h>
 11 | #import <CommonCrypto/CommonDigest.h>
 12 | 
 13 | #warning Update the value of DTSHashSALT to something specific to your application
 14 | #define DTSHashSALT @"CHANGE ME PLEASE"
 15 | 
 16 | #define DTSHashedContactsHasGivenPermission @"DTSHashedContactsHasGivenPermission"
 17 | 
 18 | typedef enum _DTSFieldToReturn {
 19 | 	DTSEmailField = 0,
 20 | 	DTSPhoneNumberField = 1,
 21 | } DTSFieldToReturn;
 22 | 
 23 | @interface DTSHashedContactsProvider ()
 24 | 
 25 | @property (copy) DTSConfirmationBlock confirmationBlock;
 26 | @property (copy) DTSDeclinedBlock declinedBlock;
 27 | @property DTSFieldToReturn contactFieldToReturn;
 28 | 
 29 | @end
 30 | 
 31 | @implementation DTSHashedContactsProvider
 32 | 
 33 | @synthesize confirmationBlock, declinedBlock, hashingMethod, contactFieldToReturn, alertTitle, alertMessage;
 34 | 
 35 | - (id)init {
 36 |     self = [super init];
 37 |     if (self) {
 38 |         //Default to SHA1
 39 |         self.hashingMethod = DTSHashWithSHA1;
 40 |         
 41 |         //Default Messaging
 42 |         self.alertTitle = NSLocalizedString(@"Allow Access to Contacts?", @"Alert title");
 43 |         NSString *appname = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleDisplayName"];
 44 |         self.alertMessage = [NSString stringWithFormat:NSLocalizedString(@"%@ would like access to your contact information.", @"Alert message"), appname];
 45 | 
 46 |     }
 47 |     return self;
 48 | }
 49 | 
 50 | -(NSString *)createSHA512:(NSString *)string
 51 | {
 52 |     const char *cstr = [string cStringUsingEncoding:NSUTF8StringEncoding];
 53 |     NSData *data = [NSData dataWithBytes:cstr length:string.length];
 54 |     uint8_t digest[CC_SHA512_DIGEST_LENGTH];
 55 |     CC_SHA512(data.bytes, data.length, digest);
 56 |     NSMutableString* output = [NSMutableString  stringWithCapacity:CC_SHA512_DIGEST_LENGTH * 2];
 57 |     for(int i = 0; i < CC_SHA512_DIGEST_LENGTH; i++)
 58 |         [output appendFormat:@"%02x", digest[i]];
 59 |     return output;
 60 | }
 61 | 
 62 | -(NSString *)createSHA1:(NSString *)string
 63 | {
 64 |     const char *cstr = [string cStringUsingEncoding:NSUTF8StringEncoding];
 65 |     NSData *data = [NSData dataWithBytes:cstr length:string.length];
 66 |     uint8_t digest[CC_SHA1_DIGEST_LENGTH];
 67 |     CC_SHA1(data.bytes, data.length, digest);
 68 |     NSMutableString* output = [NSMutableString  stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2];
 69 |     for(int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++)
 70 |         [output appendFormat:@"%02x", digest[i]];
 71 |     return output;
 72 | }
 73 | 
 74 | -(NSString*)tokenForString:(NSString*)string {
 75 |     //The concatenation of the application hash given in DTSHashSALT and the given string is used for hashing.
 76 |     NSString* stringToHash = [NSString stringWithFormat:@"%@%@", DTSHashSALT, string];
 77 |     if(self.hashingMethod == DTSHashWithSHA1) {
 78 |         return [self createSHA1:stringToHash];
 79 |     } else {
 80 |         return [self createSHA512:stringToHash];
 81 |     }
 82 | }
 83 | 
 84 | -(NSString*)cleanNumber:(NSString*)number
 85 | {	
 86 |     NSCharacterSet *numbers = [[NSCharacterSet characterSetWithCharactersInString:@"+0123456789"] invertedSet];
 87 | 	return [[number componentsSeparatedByCharactersInSet:numbers] componentsJoinedByString:@""];
 88 | }
 89 | 
 90 | -(NSString*)cleanEmail:(NSString*)email
 91 | {
 92 |     // This cleans email+additional@provider.com to be email@provider.com
 93 |     // which is another problematic scenario..
 94 |     
 95 |     NSRange plusRange = [email rangeOfString:@"+"];
 96 |     if(plusRange.length > 0)
 97 |     {
 98 |         // found
 99 |         NSRange atRange = [email rangeOfString:@"@"];
100 |         
101 |         NSString * start    = [email substringToIndex:plusRange.location];
102 |         NSString * rest     = [email substringFromIndex:atRange.location];
103 |         email = [start stringByAppendingString:rest];
104 |     }
105 |     
106 |     return email;
107 | }
108 | 
109 | -(void)getTokens {
110 |     //Retrieve entries on background thread so that we don't block the main one
111 |     dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{    
112 |         NSMutableArray* tokens = [NSMutableArray array];
113 |         
114 |         ABAddressBookRef addressBook = ABAddressBookCreate();
115 |         CFArrayRef contacts = ABAddressBookCopyArrayOfAllPeople(addressBook);
116 |         CFIndex nPeople = ABAddressBookGetPersonCount(addressBook);
117 |         
118 |         for( int i = 0; i < nPeople; ++i ) {
119 |             
120 |             ABRecordRef ref = CFArrayGetValueAtIndex(contacts,i);
121 |             ABMultiValueRef contactRef;
122 | 
123 |             if(self.contactFieldToReturn == DTSEmailField) {
124 |                 contactRef = ABRecordCopyValue(ref, kABPersonEmailProperty);
125 |             } else if(self.contactFieldToReturn == DTSPhoneNumberField) {
126 |                 contactRef = ABRecordCopyValue(ref, kABPersonPhoneProperty);
127 |             } else {
128 |                 break;
129 |             }
130 |             
131 |             CFIndex numberOfEntries = ABMultiValueGetCount(contactRef);
132 |             CFArrayRef entries = ABMultiValueCopyArrayOfAllValues(contactRef);
133 |             for( int j = 0; j < numberOfEntries; ++j ) {
134 |                 NSString* email = (__bridge NSString *)CFArrayGetValueAtIndex(entries, j);
135 |                 
136 |                 if(self.contactFieldToReturn == DTSEmailField) {
137 |                     email = [self cleanEmail:email];
138 |                 } else if(self.contactFieldToReturn == DTSPhoneNumberField) {
139 |                     email = [self cleanNumber:email];
140 |                 }
141 |                 
142 |                 NSString* hashed = [self tokenForString:email];
143 |                 [tokens addObject:hashed];
144 |             };
145 |             
146 |             // clean up
147 |             if(entries) {
148 |                 CFRelease(entries);
149 |             }
150 |             if(contactRef) {
151 |                 CFRelease(contactRef);
152 |             }
153 |         }
154 |         
155 |         if(contacts) {
156 |             CFRelease(contacts);
157 |         }
158 |         
159 |         //Always return data on the main thread
160 |         dispatch_async(dispatch_get_main_queue(), ^{
161 |             self.confirmationBlock(tokens);
162 |             self.confirmationBlock = nil;
163 |             self.declinedBlock = nil;
164 |         });
165 | 
166 |     });
167 | 
168 | }
169 | #pragma Mark Permission Confirmation
170 | 
171 | -(void)resetConfirmationAlerts {
172 |     NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
173 |     [defaults setBool:NO forKey:DTSHashedContactsHasGivenPermission];
174 |     [defaults synchronize];
175 | }
176 | 
177 | -(BOOL)userHasGivenPermission {
178 |     NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
179 |     return [defaults boolForKey:DTSHashedContactsHasGivenPermission];
180 | }
181 | 
182 | -(void)askForPermission {
183 |     UIAlertView* alert = [[UIAlertView alloc] 
184 |                           initWithTitle:self.alertTitle
185 |                           message:self.alertMessage
186 |                           delegate:self
187 |                           cancelButtonTitle:NSLocalizedString(@"Don’t Allow", @"Cancel button title") 
188 |                           otherButtonTitles:NSLocalizedString(@"Allow", @"Allow button title"), nil];
189 |     [alert show];
190 | }
191 | 
192 | #pragma Mark UIAlertViewDelegate
193 | - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
194 |     
195 |     NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
196 |     if(buttonIndex == 1) {
197 |         [defaults setBool:YES forKey:DTSHashedContactsHasGivenPermission];
198 |     } else  {
199 |         [defaults setBool:NO forKey:DTSHashedContactsHasGivenPermission];
200 |     }
201 |     [defaults synchronize];
202 | 
203 |     
204 |     if ([self userHasGivenPermission]) {
205 |         [self getTokens];
206 |     } else {
207 |         self.declinedBlock();
208 |         self.confirmationBlock = nil;
209 |         self.declinedBlock = nil;
210 |     }
211 | }
212 | 
213 | -(void)processRequest {
214 |     if ([self userHasGivenPermission]) {
215 |         [self getTokens];
216 |     } else {
217 |         [self askForPermission];
218 |     }
219 | }
220 | #pragma Mark Token Requests
221 | -(void)phoneNumberTokensWithConfirmation:(DTSConfirmationBlock)confirmation whenDeclined:(DTSDeclinedBlock)declined {
222 |     self.confirmationBlock = confirmation;
223 |     self.declinedBlock = declined;
224 |     self.contactFieldToReturn = DTSPhoneNumberField;
225 |     [self processRequest];
226 | }
227 | 
228 | 
229 | -(void)emailTokensWithConfirmation:(DTSConfirmationBlock)confirmation whenDeclined:(DTSDeclinedBlock)declined {
230 |     self.confirmationBlock = confirmation;
231 |     self.declinedBlock = declined;
232 |     self.contactFieldToReturn = DTSEmailField;
233 |     [self processRequest];
234 | }
235 | 
236 | 
237 | @end
238 | 


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/Source/de.lproj/Localizable.strings:
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https://raw.githubusercontent.com/crossforward/HashedContacts/4d0cbe5bff12f30030cb8a5d912905fcc36674f8/Source/de.lproj/Localizable.strings


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/Source/en.lproj/Localizable.strings:
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https://raw.githubusercontent.com/crossforward/HashedContacts/4d0cbe5bff12f30030cb8a5d912905fcc36674f8/Source/en.lproj/Localizable.strings


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/Source/nl.lproj/Localizable.strings:
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https://raw.githubusercontent.com/crossforward/HashedContacts/4d0cbe5bff12f30030cb8a5d912905fcc36674f8/Source/nl.lproj/Localizable.strings


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/alert_example.png:
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https://raw.githubusercontent.com/crossforward/HashedContacts/4d0cbe5bff12f30030cb8a5d912905fcc36674f8/alert_example.png


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