(Java) Office365 IMAP OAuth2 with Shared Mailbox

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Demonstrates how to authenticate using OAuth2 with shared mailboxes in outlook.office365.com. (SASL XOAUTH2 authentication for shared mailboxes in Office 365)

For more information, see https://docs.microsoft.com/en-us/exchange/client-developer/legacy-protocols/how-to-authenticate-an-imap-pop-smtp-application-by-using-oauth#sasl-xoauth2-authentication-for-shared-mailboxes-in-office-365

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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[])
  {
    // An Office365 OAuth2 access token must first be obtained prior
    // to running this code.

    // Getting the OAuth2 access token for the 1st time requires the O365 account owner's 
    // interactive authorizaition via a web browser.  Afterwards, the access token
    // can be repeatedly refreshed automatically.

    // See the following examples for getting and refreshing an OAuth2 access token

    // Get Office365 SMTP/IMAP/POP3 OAuth2 Access Token
    // Refresh Office365 SMTP/IMAP/POP3 OAuth2 Access Token

    // First get 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("Failed to open the office365 OAuth JSON file.");
        return;
        }

    CkImap imap = new CkImap();

    imap.put_Ssl(true);
    imap.put_Port(993);

    // Connect to the Office365 IMAP server.
    success = imap.Connect("outlook.office365.com");
    if (success != true) {
        System.out.println(imap.lastErrorText());
        return;
        }

    // Use OAuth2 authentication.
    imap.put_AuthMethod("XOAUTH2");

    // In case of shared mailbox access using OAuth, application needs to obtain the access token on behalf of a user
    // but replace the userName field in the SASL XOAUTH2 encoded string with the email address of the shared mailbox.

    // Login using the shared mailbox email address for the username, and the access token for the password.
    // This will cause the SASL XOAUTH2 format to be used, as described at Office 365 SASL XOAUTH2 format 

    success = imap.Login("SHARED_MAILBOX_EMAIL_ADDRESS",jsonToken.stringOf("access_token"));
    if (success != true) {
        System.out.println(imap.lastErrorText());
        return;
        }

    System.out.println("O365 OAuth2 shared mailbox authentication is successful.");

    // Do something...
    success = imap.SelectMailbox("Inbox");
    if (success != true) {
        System.out.println(imap.lastErrorText());
        return;
        }

    // Your application can continue to do other things in the IMAP session....

    // When finished, logout and close the connection.
    success = imap.Logout();
    success = imap.Disconnect();

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