(PowerBuilder) Get Access Token using a Pre-Created JSON Web Token

Demonstrates how to get an access token using a pre-created JSON Web Token (JWT).

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

integer li_rc
oleobject loo_Privkey
integer li_Success
oleobject loo_Jwt
oleobject loo_JsonHeader
oleobject loo_JsonPayload
integer li_CurDateTime
string ls_JwtStr
oleobject loo_Http
oleobject loo_Req
oleobject loo_Resp
oleobject loo_Json

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

// We're going to duplicate this CURL statement:
// curl -X POST https://api-sandbox.abnamro.com/v1/oauth/token \
// -H "Content-Type: application/x-www-form-urlencoded" \
// -H "API-Key: xxxxxx" \
// -d 'client_assertion_type=urn:ietf:params:oauth:client-assertion-type:jwt-bearer&grant_type=client_credentials&client_assertion=eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ4eHh4eHgiLCJleHAiOiIxNDk5OTQ3NjY4IiwiaXNzIjoibWUiLCJhdWQiOiJodHRwczovL2F1dGgtc2FuZGJveC5hYm5hbXJvLmNvbS9vYXV0aC90b2tlbiJ9.jGwHKG_YjgKpR8NPpaLu6nJ97obeP2vcxg6fOWBKdJ0&scope=tikkie'

// Load our pre-creaed private key PEM file.
// 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.
loo_Privkey = create oleobject
// Use "Chilkat_9_5_0.PrivateKey" for versions of Chilkat < 10.0.0
li_rc = loo_Privkey.ConnectToNewObject("Chilkat.PrivateKey")
if li_rc < 0 then
    destroy loo_Privkey
    MessageBox("Error","Connecting to COM object failed")
    return
end if

li_Success = loo_Privkey.LoadPemFile("qa_data/pem/abnAmroPrivateKey.pem")
if li_Success = 0 then
    Write-Debug loo_Privkey.LastErrorText
    destroy loo_Privkey
    return
end if

// Create the JWT.
loo_Jwt = create oleobject
// Use "Chilkat_9_5_0.Jwt" for versions of Chilkat < 10.0.0
li_rc = loo_Jwt.ConnectToNewObject("Chilkat.Jwt")

// Create the header:
// {
//     "typ": "JWT",
//     "alg": "RS256"
// }
loo_JsonHeader = create oleobject
// Use "Chilkat_9_5_0.JsonObject" for versions of Chilkat < 10.0.0
li_rc = loo_JsonHeader.ConnectToNewObject("Chilkat.JsonObject")

loo_JsonHeader.UpdateString("typ","JWT")
loo_JsonHeader.UpdateString("alg","RS256")

// Create the payload:
// {
//     "nbf": 1499947668,
//     "exp": 1499948668,
//     "iss": "me",
//     "sub": "anApiKey",
//     "aud": "https://auth-sandbox.abnamro.com/oauth/token"
// }
loo_JsonPayload = create oleobject
// Use "Chilkat_9_5_0.JsonObject" for versions of Chilkat < 10.0.0
li_rc = loo_JsonPayload.ConnectToNewObject("Chilkat.JsonObject")

li_CurDateTime = loo_Jwt.GenNumericDate(0)

// Set the "not process before" timestamp to now.
li_Success = loo_JsonPayload.AddIntAt(-1,"nbf",li_CurDateTime)

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

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

// Produce the smallest possible JWT:
loo_Jwt.AutoCompact = 1

ls_JwtStr = loo_Jwt.CreateJwtPk(loo_JsonHeader.Emit(),loo_JsonPayload.Emit(),loo_Privkey)
if loo_Jwt.LastMethodSuccess <> 1 then
    Write-Debug loo_Jwt.LastErrorText
    destroy loo_Privkey
    destroy loo_Jwt
    destroy loo_JsonHeader
    destroy loo_JsonPayload
    return
end if

loo_Http = create oleobject
// Use "Chilkat_9_5_0.Http" for versions of Chilkat < 10.0.0
li_rc = loo_Http.ConnectToNewObject("Chilkat.Http")

loo_Req = create oleobject
// Use "Chilkat_9_5_0.HttpRequest" for versions of Chilkat < 10.0.0
li_rc = loo_Req.ConnectToNewObject("Chilkat.HttpRequest")

loo_Req.AddParam("client_assertion_type","urn:ietf:params:oauth:client-assertion-type:jwt-bearer")
loo_Req.AddParam("grant_type","client_credentials")
loo_Req.AddParam("client_assertion",ls_JwtStr)
loo_Req.AddParam("scope","tikkie")

loo_Resp = loo_Http.PostUrlEncoded("https://api-sandbox.abnamro.com/v1/oauth/token",loo_Req)
if loo_Http.LastMethodSuccess = 0 then
    Write-Debug loo_Http.LastErrorText
    destroy loo_Privkey
    destroy loo_Jwt
    destroy loo_JsonHeader
    destroy loo_JsonPayload
    destroy loo_Http
    destroy loo_Req
    return
end if

if loo_Resp.StatusCode <> 200 then
    Write-Debug loo_Resp.BodyStr
    destroy loo_Resp
    destroy loo_Privkey
    destroy loo_Jwt
    destroy loo_JsonHeader
    destroy loo_JsonPayload
    destroy loo_Http
    destroy loo_Req
    return
end if

// Get the JSON result:
// {
//     "access_token": "{your access token}",
//     "expires_in": "{duration of validity in seconds}",
//     "scope": "{scope(s) for which the access token is valid}",
//     "token_type": "{it is always Bearer}"
// }
loo_Json = create oleobject
// Use "Chilkat_9_5_0.JsonObject" for versions of Chilkat < 10.0.0
li_rc = loo_Json.ConnectToNewObject("Chilkat.JsonObject")

loo_Json.Load(loo_Resp.BodyStr)
Write-Debug "access_token: " + loo_Json.StringOf("access_token")
Write-Debug "token_type: " + loo_Json.StringOf("token_type")
Write-Debug "expires_in: " + loo_Json.StringOf("expires_in")
Write-Debug "scope: " + loo_Json.StringOf("scope")

destroy loo_Resp


destroy loo_Privkey
destroy loo_Jwt
destroy loo_JsonHeader
destroy loo_JsonPayload
destroy loo_Http
destroy loo_Req
destroy loo_Json