使用 Swift 中的 Stream 打开与 SMTP 服务器的套接字连接 3

Question

我需要连接到 SMTP 服务器，但无法打开连接。握手失败（缺少身份验证）是我到达这里最远的地方。我打开了连接到普通服务器的套接字，但未能在此处打开以发送电子邮件。

    private func connect() throws {
        var input: InputStream? = nil
        var output: OutputStream? = nil

        Stream.getStreamsToHost(withName: server, port: port, inputStream: &input, outputStream: &output)

        guard let inputSafe = input, let outputSafe = output else {
            throw FailerError.unableToConnectToHost
        }

        self.inputStream = inputSafe
        self.outputStream = outputSafe

        // TODO: Authentication using login

        // Enable SSL/TLS on the streams
//        inputStream!.setProperty(kCFStreamSocketSecurityLevelNegotiatedSSL, forKey: Stream.PropertyKey(rawValue: kCFStreamPropertySocketSecurityLevel as String))
//        outputStream!.setProperty(kCFStreamSocketSecurityLevelNegotiatedSSL, forKey: Stream.PropertyKey(rawValue: kCFStreamPropertySocketSecurityLevel as String))
//        
//        // Define custom SSL/TLS settings
//        let sslSettings: [NSString : Any] = [
//             NSStream automatically sets up the socket, the streams and creates a trust object and evaulates it before you even get a chance to check the trust yourself. Only proper SSL certificates will work with this method. If you have a self signed certificate like I do, you need to disable the trust check here and evaulate the trust against your custom root CA yourself.
//            NSString(format: kCFStreamSSLValidatesCertificateChain): kCFBooleanFalse,
//            //
//            NSString(format: kCFStreamSSLPeerName): kCFNull,
//            // We are an SSL/TLS client, not a server
//            NSString(format: kCFStreamSSLIsServer): kCFBooleanFalse,
//            
//            NSString(format: kCFStreamSocketSecurityLevelNegotiatedSSL): kCFBooleanTrue
//        ]
//        
//        // Set the SSL/TLS settingson the streams
//        inputStream!.setProperty(sslSettings, forKey: Stream.PropertyKey(rawValue: kCFStreamPropertySSLSettings as String))
//        outputStream!.setProperty(sslSettings, forKey: Stream.PropertyKey(rawValue: kCFStreamPropertySSLSettings as String))


        inputStream.delegate = self
        outputStream.delegate = self

        inputStream.schedule(in: .main, forMode: .commonModes)
        outputStream.schedule(in: .main, forMode: .commonModes)

        inputStream.open()
        outputStream.open()
    }

评论部分显示我正在尝试设置一些东西，但我真的不知道那里应该有什么。有人有什么想法吗？

澄清一下，这是针对使用 SMTP 接收数据的设计糟糕的 API（不是我的想法，但必须使用它）所以请不要建议 MessageUI 否则该应用程序将获得因为直接发邮件被拒:)

如果有人感兴趣，请查看 Playground 的完整要点： https://gist.github.com/rafiki270/c004b92deca437934f702efd3508bd83

Answer 1

@Ondrej 根据 Apple 文档 "Introduction to Stream Programming Guide for Cocoa" 提到 NSStream ( Objective C ) / Stream (Swift) class 不支持连接到远程在 iOS 主持。您的替代方案是通过利用 CFStream 和 NSStream 之间的免费桥梁将您的 CFStreams 转换为 NSStreams 来使用 CFStream。

下面是一个关于如何使用 CFStream 执行此操作的示例。

CFReadStreamRef readStream;
CFWriteStreamRef writeStream;
CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)[website host], 80, &readStream, &writeStream);

NSInputStream *inputStream = (__bridge_transfer NSInputStream *)readStream;
NSOutputStream *outputStream = (__bridge_transfer NSOutputStream *)writeStream;
[inputStream setDelegate:self];
[outputStream setDelegate:self];
[inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[inputStream open];
[outputStream open];

希望对您有所帮助。

使用 Swift 中的 Stream 打开与 SMTP 服务器的套接字连接 3

Open socket connection to SMTP server using Stream in Swift 3

smtp

smtp-auth

ios

swift