(VB.NET) 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.

Dim rest As New Chilkat.Rest

' Connect to the Amazon AWS REST server.
Dim bTls As Boolean = True
Dim port As Integer = 443
Dim bAutoReconnect As Boolean = True
' The file is uploaded to the bucket named "chilkat100", which becomes part of the domain:
Dim success As Boolean = 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.
Dim authAws As New Chilkat.AuthAws
authAws.AccessKey = "AWS_ACCESS_KEY"
authAws.SecretKey = "AWS_SECRET_KEY"
authAws.ServiceName = "s3"

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


success = rest.SetAuthAws(authAws)

' Load a text file into memory.
Dim fac As New Chilkat.FileAccess
Dim fileContents As String = fac.ReadEntireTextFile("qa_data/xml/hamlet.xml","utf-8")
If (fac.LastMethodSuccess <> True) Then
    Debug.WriteLine(fac.LastErrorText)
    Exit Sub
End If


' 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.
Dim responseBodyStr As String = rest.FullRequestString("PUT","/hamlet_play.xml",fileContents)
If (rest.LastMethodSuccess <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


' Did we get a 200 response indicating success?
Dim statusCode As Integer = rest.ResponseStatusCode
If (statusCode <> 200) Then
    Debug.WriteLine("Error response: " & responseBodyStr)
    Debug.WriteLine("Status code: " & statusCode & ", Status text: " & rest.ResponseStatusText)
    Exit Sub
End If


Debug.WriteLine("File successfully uploaded.")