Classic ASP
Generate an AWS (S3) Pre-Signed URL to Download File

Demonstrates how to generate a pre-signed URL to download a file from the Amazon S3 service.
Chilkat Classic ASP Downloads

Classic ASP
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

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

set http = Server.CreateObject("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"

bucketName = "chilkat100"
objectName = "starfish/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_GenPresignedUrl("GET",bUseHttps,bucketName,objectName,numSecondsValid,awsService)
If (http.LastMethodSuccess = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( http.LastErrorText) & "</pre>"
    Response.End
End If

' The following URL can be copy-and-pasted into a browser..
Response.Write "<pre>" & Server.HTMLEncode( "Pre-Signed AWS S3 URL: " & preSignedUrl) & "</pre>"

' 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://chilkat100.s3.amazonaws.com/starfish/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,"c:/temp/qa_output/starfish.jpg")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( http.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "Success.") & "</pre>"

%>
</body>
</html>