(C#) Bunny Sign URL and then Download using Signed URL

See more Bunny CDN Examples

Shows how to sign a URL for BunnyCDN Token Authentication and then use it to download.

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

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

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

bool success;
string mySecurityKey = "e7ea8d73-8fa0-44ef-a2cc-91526f7df5ed";

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

// Extract the URL components.
Chilkat.Url urlObj = new Chilkat.Url();
urlObj.ParseUrl(url);

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

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

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

Debug.WriteLine("Expires = " + expires);

// Create the string to hash
Chilkat.StringBuilder sbToHash = new Chilkat.StringBuilder();
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.
string token = sbToHash.GetHash("sha256","base64Url","utf-8");

Chilkat.StringBuilder sbSignedUrl = new Chilkat.StringBuilder();
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);

string signedUrl = sbSignedUrl.GetAsString();
Debug.WriteLine("Signed URL: " + signedUrl);

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