(VB.NET) ChartURL - Create a Signed URL

Demonstrates how to create a signed URL for ChartURL.

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.

Dim crypt As New Chilkat.Crypt2

' Example key: "dek-d7a46236eda961a6c3c18ffcc6b077ba87d27e9ae85f7842c6d427c265dd5f69d5131308d93332353d4a55a4b1160fcf516515a4a9f0aa50fbf2d7a2e7d0f1c5"
Dim key As String = "charturl-sign-encrypt-key"
' Example token: "dt-RwYN"
Dim token As String = "charturl-token"

Dim slug As String = "weekly-activity"
Dim data As String = "{ ""options"": {""data"": {""columns"": [[""This Week"",10,13],[""Last Week"",9,5]]}}}"

crypt.HashAlgorithm = "SHA256"
crypt.MacAlgorithm = "HMAC"
crypt.SetMacKeyString(key)
crypt.EncodingMode = "base64"

Dim json As New Chilkat.JsonObject
json.Load(data)
Debug.WriteLine("json = " & json.Emit())

Dim sig As String = crypt.MacStringENC(json.Emit())

Dim sbUrl As New Chilkat.StringBuilder
sbUrl.Append("https://charturl.com/i/")
sbUrl.Append(token)
sbUrl.Append("/")
sbUrl.Append(slug)
sbUrl.Append("?d=")
sbUrl.Append(crypt.EncodeString(json.Emit(),"utf-8","url"))
sbUrl.Append("&s=")
sbUrl.Append(crypt.EncodeString(sig,"utf-8","url"))

Debug.WriteLine("Signed URL: " & sbUrl.GetAsString())