//

 //  MYKeychainItem.m

 //  MYCrypto

 //

 //  Created by Jens Alfke on 3/26/09.

 //  Copyright 2009 Jens Alfke. All rights reserved.

 //

 #import "MYKeychainItem.h"

 #import "MYCrypto_Private.h"

 #import "MYErrorUtils.h"

 NSString* const MYCSSMErrorDomain = @"CSSMErrorDomain";

 @implementation MYKeychainItem

 - (id) initWithKeychainItemRef: (MYKeychainItemRef)itemRef

 {

     Assert(itemRef!=NULL);

     self = [super init];

     if (self != nil) {

         _itemRef = itemRef;

         CFRetain(_itemRef);

         LogTo(INIT,@"%@, _itemRef=%@", [self class], itemRef);

     }

     return self;

 }

 @synthesize keychainItemRef=_itemRef;

 - (void) dealloc

 {

     if (_itemRef) CFRelease(_itemRef);

     [super dealloc];

 }

 - (void) finalize

 {

     if (_itemRef) CFRelease(_itemRef);

     [super finalize];

 }

 - (id) copyWithZone: (NSZone*)zone {

     // As keys are immutable, it's not necessary to make copies of them. This makes it more efficient

     // to use instances as NSDictionary keys or store them in NSSets.

     return [self retain];

 }

 - (BOOL) isEqual: (id)obj {

     return (obj == self) ||

            ([obj isKindOfClass: [MYKeychainItem class]] && CFEqual(_itemRef, [obj keychainItemRef]));

 }

 - (NSUInteger) hash {

     return CFHash(_itemRef);

 }

 - (NSString*) description {

     return $sprintf(@"%@[%p]", [self class], _itemRef);     //FIX: Can we do anything better?

 }

 - (NSArray*) _itemList {

     return $array((id)_itemRef);

 }

 - (MYKeychain*) keychain {

 #if MYCRYPTO_USE_IPHONE_API

     return [MYKeychain defaultKeychain];

 #else

     MYKeychain *keychain = nil;

     SecKeychainRef keychainRef = NULL;

     if (check(SecKeychainItemCopyKeychain((SecKeychainItemRef)_itemRef, &keychainRef), @"SecKeychainItemCopyKeychain")) {

         if (keychainRef) {

             keychain = [[[MYKeychain alloc] initWithKeychainRef: keychainRef] autorelease];

             CFRelease(keychainRef);

         }

     }

     return keychain;

 #endif

 }

 - (BOOL) removeFromKeychain {

     OSStatus err;

 #if MYCRYPTO_USE_IPHONE_API

     err = SecItemDelete((CFDictionaryRef) $dict( {(id)kSecValueRef, (id)_itemRef} ));

 #else

     err = SecKeychainItemDelete((SecKeychainItemRef)_itemRef);

     if (err==errSecInvalidItemRef)

         return YES;     // result for an item that's not in a keychain

 #endif

     return err==errSecItemNotFound || check(err, @"SecKeychainItemDelete");

 }

 #pragma mark -

 #pragma mark DATA / METADATA ACCESSORS:

 - (NSData*) _getContents: (OSStatus*)outError {

     NSData *contents = nil;

 #if MYCRYPTO_USE_IPHONE_API

 #else

 	UInt32 length = 0;

     void *bytes = NULL;

     *outError = SecKeychainItemCopyAttributesAndData(_itemRef, NULL, NULL, NULL, &length, &bytes);

     if (!*outError && bytes) {

         contents = [NSData dataWithBytes: bytes length: length];

         SecKeychainItemFreeAttributesAndData(NULL, bytes);

     }

 #endif

     return contents;

 }

 + (NSData*) _getAttribute: (SecKeychainAttrType)attr ofItem: (MYKeychainItemRef)item {

     NSData *value = nil;

 #if MYCRYPTO_USE_IPHONE_API

     NSDictionary *info = $dict( {(id)kSecValueRef, (id)item},

                                 {(id)kSecReturnAttributes, $true} );

     CFDictionaryRef attrs;

     if (!check(SecItemCopyMatching((CFDictionaryRef)info, (CFTypeRef*)&attrs), @"SecItemCopyMatching"))

         return nil;

     CFTypeRef rawValue = CFDictionaryGetValue(attrs,attr);

     value = rawValue ?[[(id)CFMakeCollectable(rawValue) retain] autorelease] :nil;

     CFRelease(attrs);

 #else

 	UInt32 format = kSecFormatUnknown;

 	SecKeychainAttributeInfo info = {.count=1, .tag=(UInt32*)&attr, .format=&format};

     SecKeychainAttributeList *list = NULL;

     if (check(SecKeychainItemCopyAttributesAndData((SecKeychainItemRef)item, &info,

                                                    NULL, &list, NULL, NULL),

               @"SecKeychainItemCopyAttributesAndData")) {

         if (list) {

             if (list->count == 1)

                 value = [NSData dataWithBytes: list->attr->data

                                        length: list->attr->length];

             else if (list->count > 1)

                 Warn(@"Multiple values for keychain item attribute");

             SecKeychainItemFreeAttributesAndData(list, NULL);

         }

     }

 #endif

     return value;

 }

 + (NSString*) _getStringAttribute: (SecKeychainAttrType)attr ofItem: (MYKeychainItemRef)item {

     NSData *value = [self _getAttribute: attr ofItem: item];

     if (!value) return nil;

     const char *bytes = value.bytes;

     size_t length = value.length;

     if (length>0 && bytes[length-1] == 0)

         length--;           // Some values are null-terminated!?

     NSString *str = [[NSString alloc] initWithBytes: bytes length: length

                                            encoding: NSUTF8StringEncoding];

     if (!str)

         Warn(@"MYKeychainItem: Couldn't decode attr value as string");

     return [str autorelease];

 }

 - (NSString*) stringValueOfAttribute: (SecKeychainAttrType)attr {

     return [[self class] _getStringAttribute: attr ofItem: _itemRef];

 }

 + (BOOL) _setAttribute: (SecKeychainAttrType)attr ofItem: (MYKeychainItemRef)item

            stringValue: (NSString*)stringValue

 {

 #if MYCRYPTO_USE_IPHONE_API

     id value = stringValue ?(id)stringValue :(id)[NSNull null];

     NSDictionary *query = $dict({(id)kSecValueRef, (id)item});

     NSDictionary *attrs = $dict({(id)attr, value});

     return check(SecItemUpdate((CFDictionaryRef)query, (CFDictionaryRef)attrs), @"SecItemUpdate");

 #else

     NSData *data = [stringValue dataUsingEncoding: NSUTF8StringEncoding];

     SecKeychainAttribute attribute = {.tag=attr, .length=data.length, .data=(void*)data.bytes};

 	SecKeychainAttributeList list = {.count=1, .attr=&attribute};

     return check(SecKeychainItemModifyAttributesAndData((SecKeychainItemRef)item, &list, 0, NULL),

                  @"SecKeychainItemModifyAttributesAndData");

 #endif

 }

 - (BOOL) setValue: (NSString*)valueStr ofAttribute: (SecKeychainAttrType)attr {

     return [[self class] _setAttribute: attr ofItem: _itemRef stringValue: valueStr];

 }

 @end

 BOOL check(OSStatus err, NSString *what) {

     if (err) {

 #if !MYCRYPTO_USE_IPHONE_API

         if (err < -2000000000)

             return checkcssm(err,what);

 #endif

         Warn(@"MYCrypto error, %@: %@", what, MYErrorName(NSOSStatusErrorDomain,err));

         if (err==-50)

             [NSException raise: NSGenericException format: @"%@ failed with paramErr (-50)",what];

         return NO;

     } else

         return YES;

 }

 #if !MYCRYPTO_USE_IPHONE_API

 BOOL checkcssm(CSSM_RETURN err, NSString *what) {

     if (err != CSSM_OK) {

         Warn(@"MYCrypto error, %@: %@", what, MYErrorName(MYCSSMErrorDomain,err));

         return NO;

     } else

         return YES;

 }

 #endif

 /*

  Copyright (c) 2009, Jens Alfke <jens@mooseyard.com>. All rights reserved.

  Redistribution and use in source and binary forms, with or without modification, are permitted

  provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this list of conditions

  and the following disclaimer.

  * Redistributions in binary form must reproduce the above copyright notice, this list of conditions

  and the following disclaimer in the documentation and/or other materials provided with the

  distribution.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR

  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 

  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRI-

  BUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 

   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 

  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 

  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  */