Lazarus Pascal

Yahoo Mail Refresh OAuth2 Access Token

See more Yahoo Mail Examples

Demonstrates how to refresh an OAuth2 Yahoo Mail access token. Lazarus Pascal

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.OAuth2,
  Chilkat.StringBuilder,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  jsonToken: TJsonObject;
  oauth2: TOAuth2;
  sbJson: TStringBuilder;

begin
  success := False;

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

  //  It is assumed we previously obtained an OAuth2 access token.
  //  This example loads the JSON access token file 
  //  saved by this example: Get Yahoo Mail OAuth2 Access Token

  jsonToken := TJsonObject.Create;
  success := jsonToken.LoadFile('qa_data/tokens/yahooMail.json');
  if (success <> True) then
    begin
      WriteLn('Failed to load googleSheets.json');
      Exit;
    end;

  //  The access token JSON looks like this:

  //  {
  //    "access_token": "kCVQdnOdul...LHucA--",
  //    "refresh_token": "AIenVWETSo0jklFBVkPS8vVm8E.Dj9ToRG.xDbDYmZ55WIs5t6CZhDkD",
  //    "expires_in": 3600,
  //    "token_type": "bearer",
  //    "xoauth_yahoo_guid": "HGDQCVF6JB4YDOWHITPJFBHCWA"
  //  }

  oauth2 := TOAuth2.Create;

  //  See Step 5 at https://developer.yahoo.com/oauth2/guide/flows_authcode/
  oauth2.TokenEndpoint := 'https://api.login.yahoo.com/oauth2/get_token';

  //  Replace these with actual values.
  oauth2.ClientId := 'CLIENT_ID';
  oauth2.ClientSecret := 'CLIENT_SECRET';

  //  Get the "refresh_token"
  oauth2.RefreshToken := jsonToken.StringOf('refresh_token');

  //  Send the HTTP POST to refresh the access token..
  success := oauth2.RefreshAccessToken();
  if (success <> True) then
    begin
      WriteLn(oauth2.LastErrorText);
      Exit;
    end;

  //  The response contains a new access token, but we must keep
  //  our existing refresh token for when we need to refresh again in the future.
  jsonToken.UpdateString('access_token',oauth2.AccessToken);

  //  Save the new JSON access token response to a file.
  sbJson := TStringBuilder.Create;
  jsonToken.EmitCompact := False;
  jsonToken.EmitSb(sbJson);
  sbJson.WriteFile('qa_data/tokens/yahooMail.json','utf-8',False);

  WriteLn('OAuth2 authorization granted!');
  WriteLn('New Access Token = ' + oauth2.AccessToken);


  jsonToken.Free;
  oauth2.Free;
  sbJson.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.