Dart

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.

Dart

import 'package:chilkat/chilkat.dart';

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

  final mailman = CkMailMan();

  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
  final jsonToken = CkJsonObject();
  try {
    jsonToken.loadFile('qa_data/tokens/gmail_pop3.json');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  mailman.oAuth2AccessToken = jsonToken.stringOf('access_token');

  // Make the TLS connection to the POP3 server.
  try {
    mailman.pop3Connect();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Authenticate..
  try {
    mailman.pop3Authenticate();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Find out how many emails are on the server..
  final numEmails = mailman.checkMail();
  if (numEmails < 0) {
    print(mailman.lastErrorText);
    return;
  }

  // Examine the POP3 session log:
  print(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.
  try {
    mailman.pop3EndSession();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('-- Finished.');
}