B4X

S3 Upload String using AWS Signature Version 2

See more Amazon S3 (new) Examples

Example to upload the contents of a string to the Amazon S3 service, using the older AWS Signature Version 2. B4X

Dim success As Boolean = False

'  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 ChilkatRest
rest.Initialize("rest")

'  Connect to the Amazon AWS REST server.
Dim bTls As Boolean = True
Dim port As Int = 443
Dim bAutoReconnect As Boolean = 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.
Dim authAws As ChilkatAuthAws
authAws.Initialize
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 ChilkatFileAccess
fac.Initialize
Dim fileContents As String = fac.ReadEntireTextFile("qa_data/xml/hamlet.xml", "utf-8")
If fac.LastMethodSuccess <> True Then
    Log(fac.LastErrorText)
    Return
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
    Log(rest.LastErrorText)
    Return
End If


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


Log("File successfully uploaded.")