(VB.NET) Create S3 Pre-Signed URL for Upload

Demonstrates how to generate a pre-signed URL for S3 uploads.

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

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

' Note: This example requires Chilkat v9.5.0.83 or greater.

Dim http As New Chilkat.Http

http.AwsAccessKey = "AWS_ACCESS_KEY"
http.AwsSecretKey = "AWS_SECRET_KEY"

' Make sure to set your AWS region correctly
http.AwsRegion = "us-east-1"

Dim bucketName As String = "chilkat200"
Dim objectName As String = "starfish/starfish.jpg"
Dim awsService As String = "s3"
Dim httpVerb As String = "PUT"

' The signed URL will be valid for this number of seconds:
Dim numSecondsValid As Integer = 86400

' Choose between a URL beginning with "http://" or "https://"...
Dim bUseHttps As Boolean = False

' Generate the pre-signed URL
Dim preSignedUrl As String = http.S3_GenPresignedUrl(httpVerb,bUseHttps,bucketName,objectName,numSecondsValid,awsService)
If (http.LastMethodSuccess = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Presigned URL for Upload: " & preSignedUrl)

' Here's an example of a pre-signed URL
' 
' http://chilkat200.s3.amazonaws.com/starfish/starfish.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIBJLOVZVXAU2AFUA%2F20200623%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200623T234049Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&X-Amz-Signature=xxxxxeaea071178d772856c0a4e4c0114a8d9992f0d0812955e490d0exxxxxxx
' 

' You can use the pre-signed URL to upload from Chilkat
' For example, upload by streaming from a local file
Dim resp As Chilkat.HttpResponse = http.PFile("PUT",preSignedUrl,"qa_data/jpg/starfish.jpg","image/jpg",False,False)
If (http.LastMethodSuccess = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("response status code = " & resp.StatusCode)
Debug.WriteLine("response body size: " & resp.ContentLength)
If (resp.ContentLength > 0) Then
    Debug.WriteLine("response body:")
    Debug.WriteLine(resp.BodyStr)
End If