(Node.js) 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.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

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

    var http = 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";

    var bucketName = "chilkat100";
    var objectName = "starfish/starfish.jpg";
    var localFilePath = "qa_output/starfish.jpg";
    var awsService = "s3";

    // The signed URL will be valid for this number of seconds:
    var numSecondsValid = 86400;

    // Choose between a URL beginning with "http://" or "https://"...
    var bUseHttps = false;

    // Generate the pre-signed URL
    var preSignedUrl = http.S3_GenerateUrlV4(bUseHttps,bucketName,objectName,numSecondsValid,awsService);
    if (http.LastMethodSuccess !== true) {
        console.log(http.LastErrorText);
        return;
    }

    // The following URL can be copy-and-pasted into a browser..
    console.log("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.
    var success = http.Download(preSignedUrl,"qa_output/starfish.jpg");
    if (success !== true) {
        console.log(http.LastErrorText);
    }
    else {
        console.log("Success.");
    }


}

chilkatExample();