仅将 4 行代码从 Objective C 转换为 Swift（指针）

两天来我一直在将一段代码从 Objective-C 翻译成 Swift：

CFArrayRef keyref = NULL;
CFDictionaryRef identityDict = CFArrayGetValueAtIndex(keyref, 0);
SecIdentityRef identityRef = (SecIdentityRef)CFDictionaryGetValue(identityDict,      kSecImportItemIdentity);

是的，仅此而已！我根本无法用这些指针来满足编译器的要求。 请帮忙 ：-）

这是要翻译的整个目标 C 代码：

// Read .p12 file
NSString *path = [[NSBundle mainBundle] pathForResource:@"SSLKeyStoreClient" ofType:@"p12"];
NSData *pkcs12data = [[NSData alloc] initWithContentsOfFile:path];

// Import .p12 data
CFArrayRef keyref = NULL;
OSStatus sanityChesk = SecPKCS12Import((__bridge CFDataRef)pkcs12data,
                                       (__bridge CFDictionaryRef)[NSDictionary
                                                                  dictionaryWithObject:@"wed-zzz"
                                                                  forKey:(__bridge id)kSecImportExportPassphrase],
                                       &keyref);
if (sanityChesk != noErr) {
    NSLog(@"Error while importing pkcs12 [%d]", (int)sanityChesk);
} else
    NSLog(@"Success opening p12 certificate.");

// Identity
CFDictionaryRef identityDict = CFArrayGetValueAtIndex(keyref, 0);
SecIdentityRef identityRef = (SecIdentityRef)CFDictionaryGetValue(identityDict,
                                                                  kSecImportItemIdentity);

// Cert
SecCertificateRef cert = NULL;
OSStatus status = SecIdentityCopyCertificate(identityRef, &cert);
if (status)
    NSLog(@"SecIdentityCopyCertificate failed.");

// the certificates array, containing the identity then the root certificate
NSArray *myCerts = [[NSArray alloc] initWithObjects:(__bridge id)identityRef, (__bridge id)cert, nil];

NSMutableDictionary *SSLOptions;
[SSLOptions setObject:[NSNumber numberWithBool:YES] forKey:(NSString *)kCFStreamSSLAllowsExpiredRoots];

NSDictionary *settings = [[NSDictionary alloc] initWithObjectsAndKeys:
                          [NSNumber numberWithBool:YES], kCFStreamSSLAllowsExpiredCertificates,
                          [NSNumber numberWithBool:YES], kCFStreamSSLAllowsAnyRoot,
                          [NSNumber numberWithBool:NO], kCFStreamSSLValidatesCertificateChain,
                          kCFNull,kCFStreamSSLPeerName,
                          myCerts,kCFStreamSSLCertificates,
                          nil];


CFReadStreamSetProperty((CFReadStreamRef)self.inputStream, kCFStreamPropertySSLSettings, (CFTypeRef)settings);
CFWriteStreamSetProperty((CFWriteStreamRef)self.outputStream, kCFStreamPropertySSLSettings, (CFTypeRef)settings);

这就是我到目前为止得到的：

// Read .p12 file
var path = NSBundle.mainBundle().pathForResource("SSLKeyStoreClient", ofType: "p12")
var pkcs12data: NSData = NSData.dataWithContentsOfFile(path, options: nil, error: nil)

// Import .p12 data
var keyref: Unmanaged<CFArray>?


var optionDict: NSMutableDictionary = NSMutableDictionary()
optionDict.setValue("wed-zzz", forKey: kSecImportExportPassphrase!.takeRetainedValue())

var sanityChesk = SecPKCS12Import(pkcs12data,optionDict,&keyref)
if sanityChesk != 0{ //noErr
   println("Error while importing pkcs12 \(sanityChesk)")
} else {
   println("Success opening p12 certificate.")
}


// Identity
var key = keyref!
var identityDict: CFDictionary = CFArrayGetValueAtIndex(keyref, 0)
var identityRef:COpaquePointer = CFDictionaryGetValue(identityDict,nil)


// Cert
var cert: Unmanaged<SecCertificate>?
var status: OSStatus  = SecIdentityCopyCertificate(identityRef, &cert)
if status == 0{
    println("SecIdentityCopyCertificate failed.")
}

// the certificates array, containing the identity then the root certificate
var sslOptions = Dictionary<NSObject, NSObject>()

sslOptions[kCFStreamSSLAllowsExpiredRoots] = NSNumber.numberWithBool(true)

var settings = Dictionary<NSObject, NSObject>()
settings[kCFStreamSSLAllowsExpiredCertificates] = NSNumber.numberWithBool(true)
settings[kCFStreamSSLAllowsAnyRoot] = NSNumber.numberWithBool(true)
settings[kCFStreamSSLValidatesCertificateChain] = NSNumber.numberWithBool(false)
settings[kCFStreamSSLPeerName] = kCFNull
//settings[kCFStreamSSLCertificates] = myCerts



    CFReadStreamSetProperty(self.inputStream, kCFStreamPropertySSLSettings, settings)
    CFReadStreamSetProperty(self.inputStream, kCFStreamPropertySSLSettings, settings)

问题开始于：

var identityDict: CFDictionary = CFArrayGetValueAtIndex(keyref, 0)

错误：“非托管 CFArray 无法转换为 CFArray”。

这是我迄今为止最好的尝试。

大概第一行是实际数组的占位符？如果您实际上正在与NULL数组指针，其余代码不执行任何操作。

假设你从真实的CFArrayRef，您可以利用桥接：CoreFoundation 类型会自动像 Swift 对象一样处理，因此您无需使用CFArrayRef and CFDictionaryRef指针。这同样适用于使用 CF 类型系统的任何其他 C API，因此它也应该适用于SecIdentity.

CF 集合的自动桥接似乎有些奇怪——您可以隐式桥接CFArray to an NSArray and an NSArray到一个斯威夫特Array<T>，你不能只下标 aCFArray.

所以你的转换看起来像这样（包装在处理你假设的数组的函数中）：

func getIdentity(keychainArray: NSArray) -> SecIdentity? {
    let dict = keychainArray[0] as Dictionary<String,AnyObject>
    let key = kSecImportItemIdentity.takeRetainedValue()
    return dict[key] as SecIdentity?
}

如果你有一个CFArray你可以将它传递给这个函数，它会自动桥接/转换到NSArray，然后自动转换为 Swift 数组以进行下标。将第 0 项视为 Swift 字典，您可以为字典添加下标以获取恒等式。对于钥匙，您需要将其从Unmanaged<CFString>因为安全框架未设置为该常量声明的隐式桥接。

我让这个函数返回一个可选值，因为我不知道您传入的数组+字典是否实际上包含一个标识。如果你确定是这样，你可以去掉两个问号。

（这在操场上编译，但我没有一个包含字典的数组，该字典包含方便测试的身份，所以买者自负.)