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(VBScript) Generate an AWS (S3) Pre-Signed URL using Signature V4

Demonstrates how to generate a pre-signed URL using AWS Signature Version 4. This example generates a pre-signed URL for the Amazon S3 service.

Note: this example requires Chilkat v9.5.0.66 or greater.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
Set outFile = fso.CreateTextFile("output.txt", True)

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

'  Note: This example requires Chilkat v9.5.0.66 or greater.

set http = CreateObject("Chilkat_9_5_0.Http")

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

'  Make sure to set your AWS region correctly
http.AwsRegion = "us-west-2"

bucketName = "chilkat.qa"
objectName = "images/sea_creatures/starfish.jpg"
localFilePath = "qa_output/starfish.jpg"
awsService = "s3"

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

'  Choose between a URL beginning with "http://" or "https://"...
bUseHttps = 0

'  Generate the pre-signed URL
preSignedUrl = http.S3_GenerateUrlV4(bUseHttps,bucketName,objectName,numSecondsValid,awsService)
If (http.LastMethodSuccess <> 1) Then
    outFile.WriteLine(http.LastErrorText)
    WScript.Quit
End If

'  The following URL can be copy-and-pasted into a browser..
outFile.WriteLine("Pre-Signed AWS S3 URL: " & preSignedUrl)

'  Here's an example of a pre-signed URL.
'  This URL will only work within 1 day (86400 seconds) after the time this example was published.
' 
'      http://chilkat.qa.s3.amazonaws.com/images/sea_creatures/starfish.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=16QXXDGY83AJJR6RVQ02%2F20170111%2Fus-west-2%2Fs3%2Faws4_request&X-Amz-Date=20170111T161959Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&X-Amz-Signature=72bf4fd9a15d7bbcdd313a3318d937a778905f62a3fbff9b789d8dc28acd9232

'  Now try to do an HTTP Download using the signed URL.
success = http.Download(preSignedUrl,"qa_output/starfish.jpg")
If (success <> 1) Then
    outFile.WriteLine(http.LastErrorText)
Else
    outFile.WriteLine("Success.")
End If


outFile.Close

 

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