B4X

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. B4X

Dim success As Boolean = False

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

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

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

'  Extract the URL components.
Dim urlObj As ChilkatUrl
urlObj.Initialize
urlObj.ParseUrl(url)

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


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

'  Calculate an expiration time 1 hour from the current date/time.
Dim expTime As ChilkatDateTime
expTime.Initialize
expTime.SetFromCurrentSystemTime
expTime.AddSeconds(3600)
Dim expires As String = expTime.GetAsUnixTimeStr(False)

Log("Expires = " & expires)

'  Create the string to hash
Dim sbToHash As ChilkatStringBuilder
sbToHash.Initialize
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.
Dim token As String = sbToHash.GetHash("sha256", "base64Url", "utf-8")

Dim sbSignedUrl As ChilkatStringBuilder
sbSignedUrl.Initialize
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)

Dim signedUrl As String = sbSignedUrl.GetAsString
Log("Signed URL: " & signedUrl)

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