(Delphi ActiveX) 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 for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
rsa: TChilkatRsa;
success: Integer;
privkey: IPrivateKey;
pubkey: IPublicKey;
jwt: TChilkatJwt;
jsonHeader: TChilkatJsonObject;
jsonPayload: TChilkatJsonObject;
curDateTime: Integer;
jwtStr: WideString;

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

// Create public/private key pair (RSA)
rsa := TChilkatRsa.Create(Self);

// Generate a 2048-bit key.
success := rsa.GenerateKey(2048);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rsa.LastErrorText);
    Exit;
  end;

// Export the key to PEM files.
// Write one PEM file for the private key, and one for the public key.
privkey := rsa.ExportPrivateKeyObj();
success := privkey.SavePemFile('qa_data/pem/abnAmroPrivateKey.pem');

pubkey := rsa.ExportPublicKeyObj();
success := pubkey.SavePemFile(1,'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.
jwt := TChilkatJwt.Create(Self);

// Create the header:
// {
//     "typ": "JWT",
//     "alg": "RS256"
// }
jsonHeader := TChilkatJsonObject.Create(Self);
jsonHeader.UpdateString('typ','JWT');
jsonHeader.UpdateString('alg','RS256');

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

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);

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

// Produce the smallest possible JWT:
jwt.AutoCompact := 1;

jwtStr := jwt.CreateJwtPk(jsonHeader.Emit(),jsonPayload.Emit(),privkey);
if (jwt.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(jwt.LastErrorText);
    Exit;
  end;

// Here is the JWT:
Memo1.Lines.Add(jwtStr);
end;