(PowerShell) 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.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

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

$http = New-Object 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 = $false

# Generate the pre-signed URL
$preSignedUrl = $http.S3_GenPresignedUrl("GET",$bUseHttps,$bucketName,$objectName,$numSecondsValid,$awsService)
if ($http.LastMethodSuccess -eq $false) {
    $($http.LastErrorText)
    exit
}

# The following URL can be copy-and-pasted into a browser..
$("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://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 -eq $false) {
    $($http.LastErrorText)
    exit
}

$("Success.")