(Swift 3,4,5...) S3 Add Tags to an Object

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Demonstrates how to add one or more tags to an S3 object.

For more information, see https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObjectTagging.html

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

    let rest = CkoRest()!

    // Connect to the Amazon AWS REST server in the desired region.
    // (for us-east-1, we use "s3.amazonaws.com", but for another region, such as us-west-2, we would use "s3-us-west-2.amazonaws.com")
    var bTls: Bool = true
    var port: Int = 443
    var bAutoReconnect: Bool = true
    var success: Bool = rest.connect("s3.amazonaws.com", port: port, tls: bTls, autoReconnect: bAutoReconnect)

    // Provide AWS credentials.
    let authAws = CkoAuthAws()!
    authAws.accessKey = "AWS_ACCESS_KEY"
    authAws.secretKey = "AWS_SECRET_KEY"
    authAws.serviceName = "s3"
    authAws.region = "us-east-1"

    rest.setAuthAws(authAws)

    // Set the bucket name via the HOST header.
    // In this case, the bucket name is "chilkat100".
    // Note that the Host header should use "bucketName.s3.amazonaws.com", not "bucketName.s3-us-east-1.amazonaws.com"
    // The same applies to aother regions.  The Host header should simply be <bucketName>.s3.amazonaws.com regardless of the region.
    rest.host = "chilkat100.s3.amazonaws.com"

    let xml = CkoXml()!
    xml.tag = "Tagging"
    xml.updateChildContent("TagSet|Tag|Key", value: "plant")
    xml.updateChildContent("TagSet|Tag|Value", value: "chili pepper")

    let sbRequestBody = CkoStringBuilder()!
    xml.getSb(sbRequestBody)

    // It is important to add the terminating "=" after the "?tagging".
    let sbResponse = CkoStringBuilder()!
    success = rest.fullRequestSb("PUT", uriPath: "/chiliPepper.gif?tagging=", requestBody: sbRequestBody, responseBody: sbResponse)
    if success == false {
        print("\(rest.lastErrorText!)")
        return
    }

    print("Response status code: \(rest.responseStatusCode.intValue)")

    // When successful, the S3 Storage service will respond with a 200 response code,
    // with an XML body.  
    if rest.responseStatusCode.intValue != 200 {
        // Examine the request/response to see what happened.
        print("response status code = \(rest.responseStatusCode.intValue)")
        print("response status text = \(rest.responseStatusText!)")
        print("response header: \(rest.responseHeader!)")
        print("response body: \(sbResponse.getAsString()!)")
        print("---")
        print("LastRequestStartLine: \(rest.lastRequestStartLine!)")
        print("LastRequestHeader: \(rest.lastRequestHeader!)")
    }

    print("\(sbResponse.getAsString()!)")
    print("Success.")

}