(Go) S3 Upload String using AWS Signature Version 2

Example to upload the contents of a string to the Amazon S3 service, using the older AWS Signature Version 2.

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    // Demonstrates how to use older AWS S3 Signature Version 2 for uploading the contents
    // of a string variable to an object in a bucket.

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

    rest := chilkat.NewRest()

    // Connect to the Amazon AWS REST server.
    bTls := true
    port := 443
    bAutoReconnect := true
    // The file is uploaded to the bucket named "chilkat100", which becomes part of the domain:
    success := rest.Connect("chilkat100.s3.amazonaws.com",port,bTls,bAutoReconnect)

    // ----------------------------------------------------------------------------
    // Important: For buckets created in regions outside us-east-1,
    // there are three important changes that need to be made.
    // See Working with S3 Buckets in Non-us-east-1 Regions for the details.
    // ----------------------------------------------------------------------------

    // Provide AWS credentials for the REST call.
    authAws := chilkat.NewAuthAws()
    authAws.SetAccessKey("AWS_ACCESS_KEY")
    authAws.SetSecretKey("AWS_SECRET_KEY")
    authAws.SetServiceName("s3")

    // For AWS Signature Version 2, the following two properties need to be set:
    authAws.SetSignatureVersion(2)
    // See http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html#ConstructingTheCanonicalizedResourceElement
    // The bucket is "chilkat100", and the uriPath is "/hamlet_play.xml", which must match
    // the URI path passed to the FullRequestString method below.
    authAws.SetCanonicalizedResourceV2("/chilkat100/hamlet_play.xml")

    success = rest.SetAuthAws(authAws)

    // Load a text file into memory.
    fac := chilkat.NewFileAccess()
    fileContents := fac.ReadEntireTextFile("qa_data/xml/hamlet.xml","utf-8")
    if fac.LastMethodSuccess() != true {
        fmt.Println(fac.LastErrorText())
        rest.DisposeRest()
        authAws.DisposeAuthAws()
        fac.DisposeFileAccess()
        return
    }

    // To send the file in gzip or deflate compressed format, set the Content-Encoding request
    // header to "gzip" or "deflate".  (this is optional)
    success = rest.AddHeader("Content-Encoding","gzip")

    // Indicate the Content-Type of our upload.  (This is optional)
    success = rest.AddHeader("Content-Type","text/xml")

    // We can add an "Expect: 100-continue" header so that if the request is rejected
    // by the server immediately after receiving the request header, it can respond
    // and the client (Chilkat) can avoid sending the file data.
    // (this is optional)
    success = rest.AddHeader("Expect","100-continue")

    // Upload the file to Amazon S3.
    responseBodyStr := rest.FullRequestString("PUT","/hamlet_play.xml",*fileContents)
    if rest.LastMethodSuccess() != true {
        fmt.Println(rest.LastErrorText())
        rest.DisposeRest()
        authAws.DisposeAuthAws()
        fac.DisposeFileAccess()
        return
    }

    // Did we get a 200 response indicating success?
    statusCode := rest.ResponseStatusCode()
    if statusCode != 200 {
        fmt.Println("Error response: ", *responseBodyStr)
        fmt.Println("Status code: ", statusCode, ", Status text: ", rest.ResponseStatusText())
        rest.DisposeRest()
        authAws.DisposeAuthAws()
        fac.DisposeFileAccess()
        return
    }

    fmt.Println("File successfully uploaded.")

    rest.DisposeRest()
    authAws.DisposeAuthAws()
    fac.DisposeFileAccess()