(Xojo Plugin) 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 Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

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

Dim success As Boolean
Dim mySecurityKey As String
mySecurityKey = "e7ea8d73-8fa0-44ef-a2cc-91526f7df5ed"

Dim url As String
url = "https://test.b-cdn.net/sample-pdf-with-images.pdf"

// Extract the URL components.
Dim urlObj As New Chilkat.Url
success = urlObj.ParseUrl(url)

Dim url_scheme As String
url_scheme = "https"
If (urlObj.Ssl = False) Then
    url_scheme = "http"
End If

Dim url_host As String
url_host = urlObj.Host
Dim url_path As String
url_path = urlObj.Path

// Calculate an expiration time 1 hour from the current date/time.
Dim expTime As New Chilkat.CkDateTime
success = expTime.SetFromCurrentSystemTime()
success = expTime.AddSeconds(3600)
Dim expires As String
expires = expTime.GetAsUnixTimeStr(False)

System.DebugLog("Expires = " + expires)

// Create the string to hash
Dim sbToHash As New Chilkat.StringBuilder
success = sbToHash.Append(mySecurityKey)
success = sbToHash.Append(url_path)
success = sbToHash.Append(expires)

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

Dim sbSignedUrl As New Chilkat.StringBuilder
success = sbSignedUrl.Append(url_scheme)
success = sbSignedUrl.Append("://")
success = sbSignedUrl.Append(url_host)
success = sbSignedUrl.Append(url_path)
success = sbSignedUrl.Append("?token=")
success = sbSignedUrl.Append(token)
success = sbSignedUrl.Append("&expires=")
success = sbSignedUrl.Append(expires)

Dim signedUrl As String
signedUrl = sbSignedUrl.GetAsString()
System.DebugLog("Signed URL: " + signedUrl)

// Use the signed URL to download the file.
Dim http As New Chilkat.Http
success = http.Download(signedUrl,"c:/aaworkarea/sample.pdf")
If (success = False) Then
    System.DebugLog(http.LastErrorText)
Else
    System.DebugLog("Success.")
End If