(C++) 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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#include <CkRest.h>
#include <CkAuthAws.h>
#include <CkFileAccess.h>

void ChilkatSample(void)
    {
    // 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.

    CkRest rest;

    // Connect to the Amazon AWS REST server.
    bool bTls = true;
    int port = 443;
    bool bAutoReconnect = true;
    // The file is uploaded to the bucket named "chilkat100", which becomes part of the domain:
    bool 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.
    CkAuthAws authAws;
    authAws.put_AccessKey("AWS_ACCESS_KEY");
    authAws.put_SecretKey("AWS_SECRET_KEY");
    authAws.put_ServiceName("s3");

    // For AWS Signature Version 2, the following two properties need to be set:
    authAws.put_SignatureVersion(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.put_CanonicalizedResourceV2("/chilkat100/hamlet_play.xml");

    success = rest.SetAuthAws(authAws);

    // Load a text file into memory.
    CkFileAccess fac;
    const char *fileContents = fac.readEntireTextFile("qa_data/xml/hamlet.xml","utf-8");
    if (fac.get_LastMethodSuccess() != true) {
        std::cout << fac.lastErrorText() << "\r\n";
        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.
    const char *responseBodyStr = rest.fullRequestString("PUT","/hamlet_play.xml",fileContents);
    if (rest.get_LastMethodSuccess() != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    // Did we get a 200 response indicating success?
    int statusCode = rest.get_ResponseStatusCode();
    if (statusCode != 200) {
        std::cout << "Error response: " << responseBodyStr << "\r\n";
        std::cout << "Status code: " << statusCode << ", Status text: " << rest.responseStatusText() << "\r\n";
        return;
    }

    std::cout << "File successfully uploaded." << "\r\n";
    }