Pascal (Lazarus/Delphi)

GeoOp Exchange Refresh Token for New Access Token

See more GeoOp Examples

Demonstrates how to use the /oauth2/token endpoint to exchange it for a new access token once the current access token has expired.

Note: This example requires Chilkat v9.5.0.65 or greater.

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.Rest,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  jsonToken: TJsonObject;
  rest: TRest;
  bAutoReconnect: Boolean;
  responseBody: string;
  json: TJsonObject;

begin
  success := False;

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

  //  This example also assumes that OAuth2 access and refresh tokens were previously fetched.
  //  and saved in a JSON file.  

  //  First get our previously obtained refresh token.
  //  { .... "refresh_token":"e6dqdG....mzjpT04w==", .... }
  jsonToken := TJsonObject.Create;
  success := jsonToken.LoadFile('qa_data/tokens/geoop.json');

  rest := TRest.Create;

  //  Connect to GeoOp...
  bAutoReconnect := True;
  success := rest.Connect('login.geoop.com',443,True,bAutoReconnect);
  if (success <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  Set the X-Version header.
  rest.AddHeader('X-Version','1.0');

  //  Provide the required form params to get the new access token
  WriteLn('refresh_token = ' + jsonToken.StringOf('refresh_token'));
  rest.AddQueryParam('refresh_token',jsonToken.StringOf('refresh_token'));
  rest.AddQueryParam('grant_type','refresh_token');
  rest.AddQueryParam('client_id','GEOOP-CLIENT-ID');
  rest.AddQueryParam('client_secret','GEOOP-CLIENT-SECRET');

  responseBody := rest.FullRequestFormUrlEncoded('POST','/oauth2/token');
  if (rest.LastMethodSuccess <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  If the response status code did not indicate success, then see what happened..
  if (rest.ResponseStatusCode <> 200) then
    begin
      WriteLn('Request Header: ');
      WriteLn(rest.LastRequestHeader);
      WriteLn('----');
      WriteLn('Response StatusCode = ' + rest.ResponseStatusCode);
      WriteLn('Response StatusLine: ' + rest.ResponseStatusText);
      WriteLn('Response Header:');
      WriteLn(rest.ResponseHeader);
      WriteLn(responseBody);
      Exit;
    end;

  json := TJsonObject.Create;
  json.EmitCompact := False;
  json.Load(responseBody);

  //  Show the full JSON response.  It should contain the new access token...
  WriteLn(json.Emit());


  jsonToken.Free;
  rest.Free;
  json.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.