(Swift 3,4,5...) Create S3 Pre-Signed URL for Upload

Demonstrates how to generate a pre-signed URL for S3 uploads.

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

    // Note: This example requires Chilkat v9.5.0.83 or greater.

    let http = CkoHttp()!

    http.awsAccessKey = "AWS_ACCESS_KEY"
    http.awsSecretKey = "AWS_SECRET_KEY"

    // Make sure to set your AWS region correctly
    http.awsRegion = "us-east-1"

    var bucketName: String? = "chilkat200"
    var objectName: String? = "starfish/starfish.jpg"
    var awsService: String? = "s3"
    var httpVerb: String? = "PUT"

    // The signed URL will be valid for this number of seconds:
    var numSecondsValid: Int = 86400

    // Choose between a URL beginning with "http://" or "https://"...
    var bUseHttps: Bool = false

    // Generate the pre-signed URL
    var preSignedUrl: String? = http.s3_GenPresignedUrl(httpVerb, useHttps: bUseHttps, bucketName: bucketName, path: objectName, numSecondsValid: numSecondsValid, awsService: awsService)
    if http.lastMethodSuccess == false {
        print("\(http.lastErrorText!)")
        return
    }

    print("Presigned URL for Upload: \(preSignedUrl!)")

    // Here's an example of a pre-signed URL
    // 
    // http://chilkat200.s3.amazonaws.com/starfish/starfish.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIBJLOVZVXAU2AFUA%2F20200623%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200623T234049Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&X-Amz-Signature=xxxxxeaea071178d772856c0a4e4c0114a8d9992f0d0812955e490d0exxxxxxx
    // 

    // You can use the pre-signed URL to upload from Chilkat
    // For example, upload by streaming from a local file
    var resp: CkoHttpResponse? = http.pFile("PUT", url: preSignedUrl, localFilePath: "qa_data/jpg/starfish.jpg", contentType: "image/jpg", md5: false, gzip: false)
    if http.lastMethodSuccess == false {
        print("\(http.lastErrorText!)")
        return
    }

    print("response status code = \(resp!.statusCode.intValue)")
    print("response body size: \(resp!.contentLength)")
    if resp!.contentLength > 0 {
        print("response body:")
        print("\(resp!.bodyStr!)")
    }

    resp = nil

}