(JavaScript) Bunny Sign URL and then Download using Signed URL

See more Bunny CDN Examples

For more information, see https://support.bunny.net/hc/en-us/articles/360016055099-How-to-sign-URLs-for-BunnyCDN-Token-Authentication

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

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

var mySecurityKey = "e7ea8d73-8fa0-44ef-a2cc-91526f7df5ed";

var url = "https://test.b-cdn.net/sample-pdf-with-images.pdf";

// Extract the URL components.
var urlObj = new CkUrl();
urlObj.ParseUrl(url);

var url_scheme = "https";
if (urlObj.Ssl == false) {
    url_scheme = "http";
}

var url_host = urlObj.Host;
var url_path = urlObj.Path;

// Calculate an expiration time 1 hour from the current date/time.
var expTime = new CkDateTime();
expTime.SetFromCurrentSystemTime();
expTime.AddSeconds(3600);
var expires = expTime.GetAsUnixTimeStr(false);

console.log("Expires = " + expires);

// Create the string to hash
var sbToHash = new CkStringBuilder();
sbToHash.Append(mySecurityKey);
sbToHash.Append(url_path);
sbToHash.Append(expires);

// Base64Url encoding is the same as base64, except "-" is used instead of "+",
// "_" is used instead of "/", and no "=" padding is added.
var token = sbToHash.GetHash("sha256","base64Url","utf-8");

var sbSignedUrl = new CkStringBuilder();
sbSignedUrl.Append(url_scheme);
sbSignedUrl.Append("://");
sbSignedUrl.Append(url_host);
sbSignedUrl.Append(url_path);
sbSignedUrl.Append("?token=");
sbSignedUrl.Append(token);
sbSignedUrl.Append("&expires=");
sbSignedUrl.Append(expires);

var signedUrl = sbSignedUrl.GetAsString();
console.log("Signed URL: " + signedUrl);

// Use the signed URL to download the file.
var http = new CkHttp();
success = http.Download(signedUrl,"c:/aaworkarea/sample.pdf");
if (success == false) {
    console.log(http.LastErrorText);
}
else {
    console.log("Success.");
}