Delphi DLL

bitzlato.com whoami

See more JSON Web Token (JWT) Examples

Demonstrates sending a request to the bitzlato.com whoami endpoint using an ES256 JWT token for authentication. Delphi DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Http, PrivateKey, Jwt, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
jwk: HCkJsonObject;
eccKey: HCkPrivateKey;
jwt: HCkJwt;
jose: HCkJsonObject;
claims: HCkJsonObject;
curDateTime: Integer;
jwt_token: PWideChar;
http: HCkHttp;
responseStr: PWideChar;

begin
success := False;

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

//  Use the following ECC key loaded from JWK format.
jwk := CkJsonObject_Create();
success := CkJsonObject_UpdateString(jwk,'kty','EC');
success := CkJsonObject_UpdateString(jwk,'crv','P-256');
success := CkJsonObject_UpdateString(jwk,'x','...');
success := CkJsonObject_UpdateString(jwk,'y','...');
success := CkJsonObject_UpdateString(jwk,'d','...');

eccKey := CkPrivateKey_Create();
success := CkPrivateKey_LoadJwk(eccKey,CkJsonObject__emit(jwk));
if (success = False) then
  begin
    Memo1.Lines.Add(CkPrivateKey__lastErrorText(eccKey));
    Exit;
  end;

jwt := CkJwt_Create();

// Build the JOSE header
jose := CkJsonObject_Create();
success := CkJsonObject_AppendString(jose,'format','compact');
success := CkJsonObject_AppendString(jose,'alg','ES256');

// Now build the JWT claims (also known as the payload)

// Our JWT claims will contain members as shown here:

// 	{
// 	  "email":"your_email@example.com",
// 	  "aud":"usr",
// 	  "iat":"1588286154",
// 	  "jti":"555D9123"
// 	}

claims := CkJsonObject_Create();
CkJsonObject_AppendString(claims,'jti','555D9123');
CkJsonObject_AppendString(claims,'email','your_email@example.com');

// Set the timestamp of when the JWT was created to now minus 60 seconds
curDateTime := CkJwt_GenNumericDate(jwt,-60);
success := CkJsonObject_AddIntAt(claims,-1,'iat',curDateTime);

// Set the "not process before" timestamp to now minus 60 seconds
success := CkJsonObject_AddIntAt(claims,-1,'nbf',curDateTime);

// Set the timestamp defining an expiration time (end time) for the token
// to be now + 1 hour (3600 seconds)
success := CkJsonObject_AddIntAt(claims,-1,'exp',curDateTime + 3600);

CkJsonObject_AppendString(claims,'aud','usr');

// Produce the smallest possible JWT:
CkJwt_putAutoCompact(jwt,True);

// Create the JWT token.  This is where the RSA signature is created.
jwt_token := CkJwt__createJwtPk(jwt,CkJsonObject__emit(jose),CkJsonObject__emit(claims),eccKey);

Memo1.Lines.Add(jwt_token);

// Send the HTTPS GET with the jwt_token used for Authorization.
http := CkHttp_Create();
CkHttp_putAuthToken(http,jwt_token);
responseStr := CkHttp__quickGetStr(http,'https://bitzlato.com/api/auth/whoami');
if (CkHttp_getLastMethodSuccess(http) = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

Memo1.Lines.Add('status code = ' + IntToStr(CkHttp_getLastStatus(http)));
Memo1.Lines.Add(responseStr);

CkJsonObject_Dispose(jwk);
CkPrivateKey_Dispose(eccKey);
CkJwt_Dispose(jwt);
CkJsonObject_Dispose(jose);
CkJsonObject_Dispose(claims);
CkHttp_Dispose(http);

end;