(Java) Office365 POP3 Login with OAuth2 Authentication

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Demonstrates how to authenticate using OAuth2 using the POP3 protocol with outlook.office365.com.

Note: This example requires Chilkat v9.5.0.83 or greater.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

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

    CkMailMan mailman = new CkMailMan();

    mailman.put_MailHost("outlook.office365.com");
    mailman.put_MailPort(995);
    mailman.put_PopSsl(true);

    // Use your O365 email address here.
    mailman.put_PopUsername("OFFICE365_EMAIL_ADDRESS");

    // When using OAuth2 authentication, leave the password empty.
    mailman.put_PopPassword("");

    // Load our previously obtained OAuth2 access token.
    CkJsonObject jsonToken = new CkJsonObject();
    boolean success = jsonToken.LoadFile("qa_data/tokens/office365.json");
    if (success == false) {
        System.out.println(jsonToken.lastErrorText());
        return;
        }

    mailman.put_OAuth2AccessToken(jsonToken.stringOf("access_token"));

    // Make the TLS connection to the outlook.office365.com POP3 server.
    success = mailman.Pop3Connect();
    if (success != true) {
        System.out.println(mailman.lastErrorText());
        return;
        }

    // Authenticate using XOAUTH2
    success = mailman.Pop3Authenticate();
    if (success != true) {
        System.out.println(mailman.lastErrorText());
        return;
        }

    // Find out how many emails are on the server..
    int numEmails = mailman.CheckMail();
    if (numEmails < 0) {
        System.out.println(mailman.lastErrorText());
        return;
        }

    // Examine the POP3 session log:
    System.out.println(mailman.pop3SessionLog());

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

    // **** Connected to pop.gmail.com:995
    // < +OK The Microsoft Exchange POP3 service is ready. [QwBIADIAUABSADEAOABD...YwBvAG0A]
    // > AUTH XOAUTH2
    // < + 
    // > <base64 string in XOAUTH2 format>
    // < +OK User successfully authenticated.
    // > STAT
    // < +OK 3 375302

    // End the POP3 session and close the connection to the GMail server.
    success = mailman.Pop3EndSession();
    if (success != true) {
        System.out.println(mailman.lastErrorText());
        return;
        }

    System.out.println("Finished.");
  }
}