(Lianja) 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

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

// Create public/private key pair (RSA)
loRsa = createobject("CkRsa")

// Generate a 2048-bit key.
llSuccess = loRsa.GenerateKey(2048)
if (llSuccess <> .T.) then
    ? loRsa.LastErrorText
    release loRsa
    return
endif

// Export the key to PEM files.
// Write one PEM file for the private key, and one for the public key.
loPrivkey = loRsa.ExportPrivateKeyObj()
llSuccess = loPrivkey.SavePemFile("qa_data/pem/abnAmroPrivateKey.pem")

loPubkey = loRsa.ExportPublicKeyObj()
llSuccess = loPubkey.SavePemFile(.T.,"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.
loJwt = createobject("CkJwt")

// Create the header:
// {
//     "typ": "JWT",
//     "alg": "RS256"
// }
loJsonHeader = createobject("CkJsonObject")
loJsonHeader.UpdateString("typ","JWT")
loJsonHeader.UpdateString("alg","RS256")

// Create the payload:
// {
//     "nbf": 1499947668,
//     "exp": 1499948668,
//     "iss": "me",
//     "sub": "anApiKey",
//     "aud": "https://auth-sandbox.abnamro.com/oauth/token"
// }
loJsonPayload = createobject("CkJsonObject")

lnCurDateTime = loJwt.GenNumericDate(0)

// Set the "not process before" timestamp to now.
llSuccess = loJsonPayload.AddIntAt(-1,"nbf",lnCurDateTime)

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

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

// Produce the smallest possible JWT:
loJwt.AutoCompact = .T.

lcJwtStr = loJwt.CreateJwtPk(loJsonHeader.Emit(),loJsonPayload.Emit(),loPrivkey)
if (loJwt.LastMethodSuccess <> .T.) then
    ? loJwt.LastErrorText
    release loRsa
    release loJwt
    release loJsonHeader
    release loJsonPayload
    return
endif

release loPrivkey
release loPubkey

// Here is the JWT:
? lcJwtStr


release loRsa
release loJwt
release loJsonHeader
release loJsonPayload