Pascal (Lazarus/Delphi)

ABN AMRO Create Signed JSON Web Token

See more ABN AMRO Examples

Demonstrates how to create a signed JWT to be used for authenticating requests to the ABN AMRO REST API's. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Jwt,
  Chilkat.PrivateKey,
  Chilkat.Rsa,
  Chilkat.PublicKey,
  Chilkat.JsonObject;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  rsa: TRsa;
  privkey: TPrivateKey;
  pubkey: TPublicKey;
  jwt: TJwt;
  jsonHeader: TJsonObject;
  jsonPayload: TJsonObject;
  curDateTime: Integer;
  jwtStr: string;

begin
  success := False;

  //  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 := TRsa.Create;

  //  Generate a 2048-bit key.
  privkey := TPrivateKey.Create;
  success := rsa.GenKey(2048,privkey);
  if (success = False) then
    begin
      WriteLn(rsa.LastErrorText);
      Exit;
    end;

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

  pubkey := TPublicKey.Create;
  privkey.ToPublicKey(pubkey);
  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.
  jwt := TJwt.Create;

  //  Create the header:
  //  {
  //      "typ": "JWT",
  //      "alg": "RS256"
  //  }
  jsonHeader := TJsonObject.Create;
  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 := TJsonObject.Create;

  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 := True;

  jwtStr := jwt.CreateJwtPk(jsonHeader.Emit(),jsonPayload.Emit(),privkey);
  if (jwt.LastMethodSuccess = False) then
    begin
      WriteLn(jwt.LastErrorText);
      Exit;
    end;

  //  Here is the JWT:
  WriteLn(jwtStr);


  rsa.Free;
  privkey.Free;
  pubkey.Free;
  jwt.Free;
  jsonHeader.Free;
  jsonPayload.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.