Pascal (Lazarus/Delphi)

POP3 GMail XOAUTH2 Authentication

See more GMail SMTP/IMAP/POP Examples

Demonstrates using OAuth2 authentication with pop.gmail.com.

Note: This example requires Chilkat v9.5.0.83 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.MailMan,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  mailman: TMailMan;
  jsonToken: TJsonObject;
  numEmails: Integer;

begin
  success := False;

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

  mailman := TMailMan.Create;

  mailman.MailHost := 'pop.gmail.com';
  mailman.MailPort := 995;
  mailman.PopSsl := True;

  mailman.PopUsername := 'my_account@gmail.com';

  //  If using OAuth2 authentication, leave the password empty.
  mailman.PopPassword := '';

  //  Load our previously obtained OAuth2 access token.
  //  See Getting a GMail POP3 OAuth2 Access Token
  jsonToken := TJsonObject.Create;
  success := jsonToken.LoadFile('qa_data/tokens/gmail_pop3.json');
  if (success = False) then
    begin
      WriteLn(jsonToken.LastErrorText);
      Exit;
    end;

  mailman.OAuth2AccessToken := jsonToken.StringOf('access_token');

  //  Make the TLS connection to the POP3 server.
  success := mailman.Pop3Connect();
  if (success <> True) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  //  Authenticate..
  success := mailman.Pop3Authenticate();
  if (success <> True) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  //  Find out how many emails are on the server..
  numEmails := mailman.CheckMail();
  if (numEmails < 0) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  //  Examine the POP3 session log:
  WriteLn(mailman.Pop3SessionLog);

  //  The POP3 session log will look something like this:

  //  **** Connected to pop.gmail.com:995
  //  < +OK Gpop ready for requests from 87.9.200.42 l16mb86351205iok
  //  > AUTH XOAUTH2 dXNlcj1....VaMDJFAQE=
  //  < +OK Welcome.
  //  > STAT
  //  < +OK 301 1627357
  //  
  //  -- Finished.

  //  End the POP3 session and close the connection to the GMail server.
  success := mailman.Pop3EndSession();
  if (success <> True) then
    begin
      WriteLn(mailman.LastErrorText);
      Exit;
    end;

  WriteLn('-- Finished.');


  mailman.Free;
  jsonToken.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.