(Lianja) 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.

loRest = createobject("CkRest")

// Connect to the Amazon AWS REST server.
llBTls = .T.
lnPort = 443
llBAutoReconnect = .T.
// The file is uploaded to the bucket named "chilkat100", which becomes part of the domain:
llSuccess = loRest.Connect("chilkat100.s3.amazonaws.com",lnPort,llBTls,llBAutoReconnect)

// ----------------------------------------------------------------------------
// 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.
loAuthAws = createobject("CkAuthAws")
loAuthAws.AccessKey = "AWS_ACCESS_KEY"
loAuthAws.SecretKey = "AWS_SECRET_KEY"
loAuthAws.ServiceName = "s3"

// For AWS Signature Version 2, the following two properties need to be set:
loAuthAws.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.
loAuthAws.CanonicalizedResourceV2 = "/chilkat100/hamlet_play.xml"

llSuccess = loRest.SetAuthAws(loAuthAws)

// Load a text file into memory.
loFac = createobject("CkFileAccess")
lcFileContents = loFac.ReadEntireTextFile("qa_data/xml/hamlet.xml","utf-8")
if (loFac.LastMethodSuccess <> .T.) then
    ? loFac.LastErrorText
    release loRest
    release loAuthAws
    release loFac
    return
endif

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

// Indicate the Content-Type of our upload.  (This is optional)
llSuccess = loRest.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)
llSuccess = loRest.AddHeader("Expect","100-continue")

// Upload the file to Amazon S3.
lcResponseBodyStr = loRest.FullRequestString("PUT","/hamlet_play.xml",lcFileContents)
if (loRest.LastMethodSuccess <> .T.) then
    ? loRest.LastErrorText
    release loRest
    release loAuthAws
    release loFac
    return
endif

// Did we get a 200 response indicating success?
lnStatusCode = loRest.ResponseStatusCode
if (lnStatusCode <> 200) then
    ? "Error response: " + lcResponseBodyStr
    ? "Status code: " + str(lnStatusCode) + ", Status text: " + loRest.ResponseStatusText
    release loRest
    release loAuthAws
    release loFac
    return
endif

? "File successfully uploaded."


release loRest
release loAuthAws
release loFac