Alamofire 5代表中的缺少sessionDidReceiveChallenge

Question

我需要从Alamofire 4迁移到5，但是我在委托上缺少sessionDidReceiveChallenge回调

我以前在版本4中使用过这样的内容：

let manager = Alamofire.SessionManager(
    configuration: URLSessionConfiguration.default
)

manager.delegate.sessionDidReceiveChallenge = { session, challenge in

    let method = challenge.protectionSpace.authenticationMethod

    if method == NSURLAuthenticationMethodClientCertificate {
        return (.useCredential, self.cert.urlCredential())
    }
    if method == NSURLAuthenticationMethodServerTrust {
        let trust = challenge.protectionSpace.serverTrust!
        let credential = URLCredential(trust: trust)
        return (.useCredential, credential)
    }
    return (.performDefaultHandling, Optional.none)
}

但是现在是版本5，委托已更改为SessionDelegate类，但未提供类似功能

我试图像这样使用URLSession中的委托：

let delegate = SomeSessionDelegate()

let delegateQueue: OperationQueue = .init()

delegateQueue.underlyingQueue = .global(qos: .background)

let session = URLSession(
    configuration: URLSessionConfiguration.af.default,
    delegate: delegate,
    delegateQueue: delegateQueue
)

let manager = Alamofire.Session(
    session: session,
    delegate: SessionDelegate(),
    rootQueue: .global(qos: .background)
)

class SomeSessionDelegate: NSObject, URLSessionDelegate {

    let cert = ...

    func urlSession(_ session: URLSession, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {

        //same impl as before
    }
}

我猜我在版本5中的实现是错误的，因为我停止获取响应回调

[请提供有关在版本5中如何正确处理请求质询的建议

Answer 1

不必重写SessionDelegate即可使用客户端证书。 Alamofire将自动使用附加的URLCredential进行客户端证书挑战。只需将凭证附加到请求：

AF.request(...)
    .authenticate(with: clientCertCredential)
    .response...

此外，您的服务器信任检查将返回任何有效的信任，这可能是安全问题。我将立即停止使用该代码。    

Answer 2

对于会话级别的证书处理，我使用了URLProtectionSpace共享存储上的URLCredentialStorage，然后将其设置为Alamofire.Session配置

这里有一个示例进行设置（端口443可能就足够了]

fileprivate func registerURLCredential() {

    let storage = URLCredentialStorage.shared

    do {
        let credential: URLCredential = try loadURLCredential("certificate", password: "blablabla")

        let url = URL.API
        let host = url.host ?? ""

        let ports: [Int] = [80, 443, url.port ?? 0]

        for port in ports {

            let space = URLProtectionSpace(
                host: host,
                port: port,
                protocol: url.scheme,
                realm: nil,
                authenticationMethod: NSURLAuthenticationMethodClientCertificate
            )

            storage.set(credential, for: space)
        }
    } catch {
        print(error)
    }
}


fileprivate func createSession(_ configurationHandler: ((_ configuration: URLSessionConfiguration) -> Void)? = nil) -> Alamofire.Session {

    let configuration = URLSessionConfiguration.af.default

    registerURLCredential()

    configuration.urlCredentialStorage = .shared

    configurationHandler?(configuration)

    let session = Session(
        configuration: configuration,
        requestQueue: .global(qos: .background),
        serializationQueue: .global(qos: .background)
    )

    return session
}

一个简单的用途是：
let sesstion = createSession({ configuration in

    configuration.httpMaximumConnectionsPerHost = 1
})