Keychain/KCEventObserver.cpp

   1 /*
   2  * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18
  19 /*
  20         File:           KCEventObserver.cpp
  21
  22         Contains:       OS X CF Observer for Keychain Events
  23
  24         Written by:     Craig Mortensen
  25
  26         Copyright:      2000 by Apple Computer, Inc., All rights reserved.
  27
  28         Change History (most recent first):
  29
  30         To Do:
  31 */
  32
  33 #include "KCEventObserver.h"
  34
  35 using namespace Security;
  36
  37 Observer::Observer()
  38 {
  39 }
  40 //
  41 // Upon creation of this object, add this observer for this instance of KeychainCore
  42 //
  43 Observer::Observer( CFStringRef name, const void *object,
  44                     CFNotificationSuspensionBehavior suspensionBehavior )
  45 {
  46     add( name, object, suspensionBehavior );
  47 }
  48
  49 //
  50 // Upon destruction of this object, remove 'this' observer for this instance of KeychainCore
  51 //
  52 Observer::~Observer()
  53 {
  54     ::CFNotificationCenterRemoveEveryObserver( CFNotificationCenterGetDistributedCenter(), this );
  55 }
  56
  57 //
  58 // 'callback' is passed in to CFNotificationCenterAddObserver() when this object
  59 // is constructed when KeychainCore is created.  'callback' is called by CF whenever an event happens.
  60 //
  61 void Observer::callback(CFNotificationCenterRef         center,
  62                         void*                                           observer,
  63                         CFStringRef                             name,
  64                         const void*                             object,
  65                         CFDictionaryRef                         userInfo)
  66 {
  67     // 'Event' is where this KeychainCore notifies it's clients of the kc event that just happened.
  68     //
  69         try
  70         {
  71                 reinterpret_cast<Observer *>(observer)->Event( center, name, object, userInfo );
  72         }
  73         catch(...)
  74         {
  75                 // @@@ do a log to console();
  76         }
  77 }
  78
  79 //
  80 // Add 'this' observer to CF for this instance of KeychainCore
  81 //
  82 void Observer::add( CFStringRef                                          name,
  83                     const void*                                          object,
  84                     CFNotificationSuspensionBehavior suspensionBehavior )
  85 {
  86     ::CFNotificationCenterAddObserver( CFNotificationCenterGetDistributedCenter(),
  87                                        this, callback, name, object, suspensionBehavior );
  88 }