(Xojo Plugin) ABN AMRO Create Signed JSON Web Token

Demonstrates how to create a signed JWT to be used for authenticating requests to the ABN AMRO REST API's.

For more information, see https://developer.abnamro.com/get-started#headingFive

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

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

// Create public/private key pair (RSA)
Dim rsa As New Chilkat.Rsa

// Generate a 2048-bit key.
Dim success As Boolean
success = rsa.GenerateKey(2048)
If (success <> True) Then
    System.DebugLog(rsa.LastErrorText)
    Return
End If

// Export the key to PEM files.
// Write one PEM file for the private key, and one for the public key.
Dim privkey As Chilkat.PrivateKey
privkey = rsa.ExportPrivateKeyObj()
success = privkey.SavePemFile("qa_data/pem/abnAmroPrivateKey.pem")

Dim pubkey As Chilkat.PublicKey
pubkey = rsa.ExportPublicKeyObj()
success = pubkey.SavePemFile(True,"qa_data/pem/abnAmroPublicKey.pem")
// Note: Please share your public key along with your app name and developer email id at api.support@nl.abnamro.com. 
// Token generation will not work unless public key is associated with your app.

// Create the JWT.
Dim jwt As New Chilkat.Jwt

// Create the header:
// {
//     "typ": "JWT",
//     "alg": "RS256"
// }
Dim jsonHeader As New Chilkat.JsonObject
success = jsonHeader.UpdateString("typ","JWT")
success = jsonHeader.UpdateString("alg","RS256")

// Create the payload:
// {
//     "nbf": 1499947668,
//     "exp": 1499948668,
//     "iss": "me",
//     "sub": "anApiKey",
//     "aud": "https://auth-sandbox.abnamro.com/oauth/token"
// }
Dim jsonPayload As New Chilkat.JsonObject

Dim curDateTime As Int32
curDateTime = jwt.GenNumericDate(0)

// Set the "not process before" timestamp to now.
success = jsonPayload.AddIntAt(-1,"nbf",curDateTime)

// Set the timestamp defining an expiration time (end time) for the token
// to be now + 1 hour (3600 seconds)
success = jsonPayload.AddIntAt(-1,"exp",curDateTime + 3600)

success = jsonPayload.UpdateString("iss","me")
success = jsonPayload.UpdateString("sub","anApiKey")
success = jsonPayload.UpdateString("aud","https://auth-sandbox.abnamro.com/oauth/token")

// Produce the smallest possible JWT:
jwt.AutoCompact = True

Dim jwtStr As String
jwtStr = jwt.CreateJwtPk(jsonHeader.Emit(),jsonPayload.Emit(),privkey)
If (jwt.LastMethodSuccess <> True) Then
    System.DebugLog(jwt.LastErrorText)
    Return
End If

// Here is the JWT:
System.DebugLog(jwtStr)