(PHP Extension) 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 PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux

<?php

include("chilkat.php");

$success = false;

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

$http = new CkHttp();

$http->put_AwsAccessKey('AWS_ACCESS_KEY');
$http->put_AwsSecretKey('AWS_SECRET_KEY');

// Make sure to set your AWS region correctly
$http->put_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->get_LastMethodSuccess() == false) {
    print $http->lastErrorText() . "\n";
    exit;
}

// The following URL can be copy-and-pasted into a browser..
print 'Pre-Signed AWS S3 URL: ' . $preSignedUrl . "\n";

// 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 == false) {
    print $http->lastErrorText() . "\n";
    exit;
}

print 'Success.' . "\n";

?>