Require AddressBook permission.

Signal requires the AddressBook permission to use the app at the
moment. This avoids the edgecases where a user doesn’t allow access to
his address book and then tries to use the app. We’re also doing a
significantly better job at explaining why we need this permission to
the user.

Signal/Signal-Info.plist

@@ -50,7 +50,7 @@
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
 	<key>NSContactsUsageDescription</key>
-	<string>Signal uses your AddressBook as contacts list. We do not store your contacts on the server.</string>
+	<string>Signal uses your contacts to find users you know. We do not store your contacts on the server.</string>
 	<key>NSMicrophoneUsageDescription</key>
 	<string>Signal needs access to your microphone to make and receive phone calls.</string>
 	<key>UIAppFonts</key>

Signal/src/AppDelegate.m

@@ -46,7 +46,11 @@ static NSString * const kURLHostVerifyPrefix = @"verify";
     [logger addLoggingCallback:^(NSString *category, id details, NSUInteger index) {}];
     [Environment setCurrent:[Release releaseEnvironmentWithLogging:logger]];
     [Environment.getCurrent.phoneDirectoryManager startUntilCancelled:nil];
+    
+    if ([TSAccountManager isRegistered]) {
         [Environment.getCurrent.contactsManager doAfterEnvironmentInitSetup];
+    }
+    
     [Environment.getCurrent initCallListener];
     
     [[TSStorageManager sharedManager] setupDatabase];
@@ -151,6 +155,7 @@ static NSString * const kURLHostVerifyPrefix = @"verify";
     if ([TSAccountManager isRegistered]) {
         // We're double checking that the app is active, to be sure since we can't verify in production env due to code signing.
         [TSSocketManager becomeActiveFromForeground];
+        [[Environment getCurrent].contactsManager verifyABPermission];
     }
 
     [self removeScreenProtection];

Signal/src/contact/ContactsManager.h

@@ -41,6 +41,8 @@ typedef void(^ABReloadRequestCompletionBlock)(NSArray *contacts);
 +(BOOL)name:(NSString *)nameString matchesQuery:(NSString *)queryString;
 +(BOOL)phoneNumber:(PhoneNumber *)phoneNumber matchesQuery:(NSString *)queryString;
 
+- (void)verifyABPermission;
+
 - (NSArray*)allContacts;
 - (NSArray*)signalContacts;
 - (NSArray*)textSecureContacts;

Signal/src/contact/ContactsManager.m

@@ -27,6 +27,7 @@ typedef BOOL (^ContactSearchBlock)(id, NSUInteger, BOOL*);
     }
     return self;
 }
+
 -(void) doAfterEnvironmentInitSetup {
     [self setupAddressBook];
     [observableContactsController watchLatestValueOnArbitraryThread:^(NSArray *latestContacts) {
@@ -46,6 +47,12 @@ typedef BOOL (^ContactSearchBlock)(id, NSUInteger, BOOL*);
     [life cancel];
 }
 
+- (void)verifyABPermission {
+    if (!addressBookReference) {
+        [self setupAddressBook];
+    }
+}
+
 #pragma mark - Notification Handlers
 -(void) registerNotificationHandlers{
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updatedDirectoryHandler:) name:NOTIFICATION_DIRECTORY_UPDATE object:nil];
@@ -88,7 +95,9 @@ void onAddressBookChanged(ABAddressBookRef notifyAddressBook, CFDictionaryRef in
     ABAddressBookRef addressBookRef = ABAddressBookCreateWithOptions(NULL, &creationError);
     checkOperationDescribe(nil == creationError, [((__bridge NSError *)creationError) localizedDescription]) ;
     ABAddressBookRequestAccessWithCompletion(addressBookRef, ^(bool granted, CFErrorRef error) {
-        // TO DO: DISPLAY ALERT
+        if (!granted) {
+            [ContactsManager blockingContactDialog];
+        }
     });
     [observableContactsController updateValue:[self getContactsFromAddressBook:addressBookRef]];
 }
@@ -103,6 +112,20 @@ void onAddressBookChanged(ABAddressBookRef notifyAddressBook, CFDictionaryRef in
     }
 }
 
++ (void)blockingContactDialog{
+    UIAlertController *controller = [UIAlertController alertControllerWithTitle:NSLocalizedString(@"AB_PERMISSION_MISSING_TITLE", nil)
+                                                                        message:NSLocalizedString(@"AB_PERMISSION_MISSING_BODY", nil)
+                                                                 preferredStyle:UIAlertControllerStyleAlert];
+    
+    [controller addAction:[UIAlertAction actionWithTitle:NSLocalizedString(@"AB_PERMISSION_MISSING_ACTION", nil)
+                                                   style:UIAlertActionStyleDefault
+                                                 handler:^(UIAlertAction *action) {
+                                                     [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
+                                                 }]];
+    
+    [[[UIApplication sharedApplication] keyWindow].rootViewController presentViewController:controller animated:YES completion:nil];
+}
+
 - (void)setupLatestRedPhoneUsers:(NSArray *)users {
     if (users) {
         latestWhisperUsersById = [ContactsManager keyContactsById:users];
@@ -126,6 +149,7 @@ void onAddressBookChanged(ABAddressBookRef notifyAddressBook, CFDictionaryRef in
     ABAddressBookRef addressBookRef = ABAddressBookCreateWithOptions(NULL, &creationError);
     assert((addressBookRef == nil) == (creationError != nil));
     if (creationError != nil) {
+        [self blockingContactDialog];
         return [TOCFuture futureWithFailure:(__bridge_transfer id)creationError];
     }
     
@@ -138,6 +162,7 @@ void onAddressBookChanged(ABAddressBookRef notifyAddressBook, CFDictionaryRef in
                 [futureAddressBookSource trySetResult:addressBook];
             });
         } else {
+            [self blockingContactDialog];
             [futureAddressBookSource trySetFailure:(__bridge id)requestAccessError];
         }
     });

Signal/src/view controllers/CodeVerificationViewController.m

@@ -9,6 +9,7 @@
 #import "CodeVerificationViewController.h"
 
 #import "Environment.h"
+#import "ContactsManager.h"
 #import "PhoneNumberDirectoryFilterManager.h"
 #import "RPServerRequestsManager.h"
 #import "LocalizableText.h"
@@ -62,7 +63,19 @@
     [self registerWithSuccess:^{
       [_submitCodeSpinner stopAnimating];
       [Environment.getCurrent.phoneDirectoryManager forceUpdate];
-      [self.navigationController dismissViewControllerAnimated:YES completion:nil];
+      [self.navigationController dismissViewControllerAnimated:YES completion:^{
+          UIAlertController *controller = [UIAlertController alertControllerWithTitle:NSLocalizedString(@"REGISTER_CONTACTS_WELCOME", nil)
+                                                                              message:NSLocalizedString(@"REGISTER_CONTACTS_BODY", nil)
+                                                                       preferredStyle:UIAlertControllerStyleAlert];
+          
+          [controller addAction:[UIAlertAction actionWithTitle:NSLocalizedString(@"REGISTER_CONTACTS_CONTINUE", nil)
+                                                         style:UIAlertActionStyleDefault
+                                                       handler:^(UIAlertAction *action) {
+                                                           [Environment.getCurrent.contactsManager doAfterEnvironmentInitSetup];
+                                                       }]];
+          
+          [[UIApplication sharedApplication].keyWindow.rootViewController presentViewController:controller animated:YES completion:nil];
+      }];
     } failure:^(NSError *error) {
       [self showAlertForError:error];
       [self enableServerActions:YES];