Node.js

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

See more Amazon S3 (new) Examples

Demonstrates how to generate a pre-signed URL to download a file from the Amazon S3 service. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    //  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_GenPresignedUrl("GET",bUseHttps,bucketName,objectName,numSecondsValid,awsService);
    if (http.LastMethodSuccess == false) {
        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.
    success = http.Download(preSignedUrl,"c:/temp/qa_output/starfish.jpg");
    if (success == false) {
        console.log(http.LastErrorText);
        return;
    }

    console.log("Success.");

}

chilkatExample();