(Swift 3,4,5...) Send SOAP multipart/related with XML Body and Zip Attachment

Demonstrates how to construct and send a multipart/related POST containing a SOAP XML body and a binary zip attachment.

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func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // This example constructs and sends the following HTTP request.
    // (The boundary strings will be different and auto-generated by Chilkat)

    // Accept-Encoding: gzip,deflate
    // SOAPAction: invio
    // Content-Type: Multipart/Related; boundary="MIME_boundary"; type="text/xml"; start="mailto:rootpart@soapui.org"
    // MIME-Version: 1.0
    // 
    // --MIME_boundary
    // Content-Type: text/xml; charset=UTF-8
    // Content-Transfer-Encoding: 8bit
    // Content-ID: <rootpart@soapui.org>
    //  
    // <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:urn="urn:attachment.ws.it">
    // <soapenv:Header/>
    // <soapenv:Body>
    //   <urn:inputBean>
    //    <nomeFileAllegato>myfile.zip</nomeFileAllegato>
    //   </urn:inputBean>
    // </soapenv:Body>
    // </soapenv:Envelope>
    //  
    // --MIME_boundary
    // Content-Type: application/zip
    // Content-Transfer-Encoding: binary
    // Content-ID: <myfile.zip>
    // Content-Disposition: attachment; name="myfile.zip"; filename="myfile.zip"
    // 
    // ... binary zip data goes here ...
    // --MIME_boundary--
    // 

    let rest = CkoRest()!
    var success: Bool

    rest.addHeader("Accept-Encoding", value: "gzip,deflate")
    rest.addHeader("SOAPAction", value: "invio")
    rest.addHeader("Content-Type", value: "Multipart/Related; boundary=\"MIME_boundary\"; type=\"text/xml\"; start=\"mailto:rootpart@soapui.org\"")
    rest.addHeader("MIME-Version", value: "1.0")

    // Build the SOAP XML:
    // Use this online tool to generate the code from sample XML: 
    // Generate Code to Create XML

    let xml = CkoXml()!
    xml.tag = "soapenv:Envelope"
    xml.addAttribute("xmlns:soapenv", value: "http://schemas.xmlsoap.org/soap/envelope/")
    xml.addAttribute("xmlns:urn", value: "urn:attachment.ws.it")
    xml.updateChildContent("soapenv:Header", value: "")
    xml.updateChildContent("soapenv:Body|urn:inputBean|nomeFileAllegato", value: "myfile.zip")

    // Build the SOAP XML sub-part
    rest.partSelector = "1"
    rest.addHeader("Content-Type", value: "text/xml; charset=UTF-8")
    rest.addHeader("Content-Transfer-Encoding", value: "8bit")
    rest.addHeader("Content-ID", value: "<rootpart@soapui.org>")
    success = rest.setMultipartBodyString(xml.getXml())

    // Build the sub-part containing the .zip
    rest.partSelector = "2"
    rest.addHeader("Content-Type", value: "application/zip")
    rest.addHeader("Content-Transfer-Encoding", value: "binary")
    rest.addHeader("Content-ID", value: "<myfile.zip>")
    rest.addHeader("Content-Disposition", value: "attachment; name=\"myfile.zip\"; filename=\"myfile.zip\"")

    // Add a zip file to the 2nd sub-part body.
    // This example will load the .zip file into memory, but it is also possible to stream directly from the file as the request is sent
    // by calling SetMultipartBodyStream.
    let bd = CkoBinData()!
    success = bd.loadFile("qa_data/zips/helloWorld.zip")
    success = rest.setMultipartBodyBd(bd)

    // To be safe, always revert the PartSelector back to 0..
    rest.partSelector = "0"

    // Send the request by connecting to the web server and then sending..
    // Connect using TLS.
    var bAutoReconnect: Bool = true
    success = rest.connect("www.chilkatsoft.com", port: 443, tls: true, autoReconnect: bAutoReconnect)
    if success != true {
        print("\(rest.lastErrorText!)")
        return
    }

    // In this example, we're setting DebugMode.
    // When debug mode is turned on, no request is actually sent.
    // Instead, the request that would be sent is recorded to memory
    // and we can retrieve it afterwards..
    rest.debugMode = true

    var responseStr: String? = rest.fullRequestMultipart("POST", uriPath: "/someTargetPath")
    if rest.lastMethodSuccess != true {
        print("\(rest.lastErrorText!)")
        return
    }

    // Retrieve the request that would've been sent and save it to a file.
    // We can then examine the file to see if the request was structured as we desired.
    // (Note: The zip bytes will be binary data and will appear as garbled garbage in a text editor..)
    let bdRequest = CkoBinData()!
    rest.getLastDebugRequest(bdRequest)
    success = bdRequest.writeFile("qa_output/multipartRelatedRequest.bin")

    print("OK, examine the output file..")

}