Pascal (Lazarus/Delphi)

Banco Inter OAuth2 Client Credentials

Generate an OAuth2 access token needed to consume the Inter APIs. 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.HttpResponse,
  Chilkat.JsonObject,
  Chilkat.HttpRequest,
  Chilkat.BinData,
  Chilkat.PrivateKey,
  Chilkat.Cert,
  Chilkat.Http;

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

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  cert: TCert;
  bdPrivKey: TBinData;
  privKey: TPrivateKey;
  req: THttpRequest;
  resp: THttpResponse;
  jResp: TJsonObject;
  respStatusCode: Integer;

begin
  success := False;

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

  http := THttp.Create;

  //  First load the certificate and private key, and set as the HTTP object's client certificate.
  cert := TCert.Create;
  success := cert.LoadFromFile('<nome arquivo certificado>.crt');
  if (success = False) then
    begin
      WriteLn(cert.LastErrorText);
      Exit;
    end;

  bdPrivKey := TBinData.Create;
  success := bdPrivKey.LoadFile('<nome arquivo chave privada>.key');
  if (success = False) then
    begin
      WriteLn('Failed to load <nome');
      Exit;
    end;

  privKey := TPrivateKey.Create;
  success := privKey.LoadAnyFormat(bdPrivKey,'');
  if (success = False) then
    begin
      WriteLn(privKey.LastErrorText);
      Exit;
    end;

  success := cert.SetPrivateKey(privKey);
  if (success = False) then
    begin
      WriteLn(cert.LastErrorText);
      Exit;
    end;

  success := http.SetSslClientCert(cert);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  req := THttpRequest.Create;
  req.HttpVerb := 'POST';
  req.Path := '/oauth/v2/token';
  req.ContentType := 'application/x-www-form-urlencoded';
  req.AddParam('grant_type','client_credentials');
  //  Requested scopes in OAuth2 are typically SPACE separated.
  req.AddParam('scope','boleto-cobranca.read boleto-cobranca.write');
  req.AddHeader('accept','application/json');

  resp := THttpResponse.Create;
  success := http.HttpReq('https://cdpj.partners.bancointer.com.br/oauth/v2/token',req,resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  jResp := TJsonObject.Create;
  resp.GetBodyJson(jResp);
  jResp.EmitCompact := False;

  WriteLn('Response Body:');
  WriteLn(jResp.Emit());

  respStatusCode := resp.StatusCode;
  WriteLn('Response Status Code = ' + respStatusCode);
  if (respStatusCode >= 400) then
    begin
      WriteLn('Response Header:');
      WriteLn(resp.Header);
      WriteLn('Failed.');
      Exit;
    end;

  success := jResp.WriteFile('qa_data/tokens/banco_inter_client_credentials.json');
  if (success = False) then
    begin
      WriteLn('Failed to save JSON access token file.');
      Exit;
    end;

  WriteLn('Success.');


  http.Free;
  cert.Free;
  bdPrivKey.Free;
  privKey.Free;
  req.Free;
  resp.Free;
  jResp.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.