Visual Basic 6.0

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. Visual Basic 6.0

Dim success As Long
success = 0

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

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 ChilkatUrl
success = urlObj.ParseUrl(url)

Dim url_scheme As String
url_scheme = "https"
If (urlObj.Ssl = 0) 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 CkDateTime
success = expTime.SetFromCurrentSystemTime()
success = expTime.AddSeconds(3600)
Dim expires As String
expires = expTime.GetAsUnixTimeStr(0)

Debug.Print "Expires = " & expires

' Create the string to hash
Dim sbToHash As New ChilkatStringBuilder
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 ChilkatStringBuilder
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()
Debug.Print "Signed URL: " & signedUrl

' Use the signed URL to download the file.
Dim http As New ChilkatHttp
success = http.Download(signedUrl,"c:/aaworkarea/sample.pdf")
If (success = 0) Then
    Debug.Print http.LastErrorText
Else
    Debug.Print "Success."
End If