I am developing a basic email sender application that only sends emails to Gmail. After a while, I realized the OAuth2 hole pattern that Google now requires for authentication using a method getToken()from the API GoogleAuthUtil.
I searched the Internet for JavaMail code to send email using the token I extracted from the API, and I found the following code that I am currently using:
package com.provider;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.Provider;
import java.security.Security;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.URLName;
import javax.mail.Message;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.util.ByteArrayDataSource;
import android.util.Log;
import com.sun.mail.smtp.SMTPTransport;
import com.sun.mail.util.BASE64EncoderStream;
public class GMailOauthSender {
private Session session;
private String mailhost = "smtp.gmail.com";
private int port = 587;
private String user;
private String password;
public SMTPTransport connectToSmtp(String host, int port, String userEmail,
String oauthToken, boolean debug) throws Exception {
Properties props = new Properties();
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.starttls.required", "true");
props.put("mail.smtp.sasl.enable", "true");
props.put("mail.smtp.auth", "true");
props.put("mail.imap.auth.login.disable", "true");
props.put("mail.imap.auth.plain.disable", "true");
session = Session.getInstance(props);
session.setDebug(debug);
final URLName unusedUrlName = null;
SMTPTransport transport = new SMTPTransport(session, unusedUrlName);
final String emptyPassword = null;
transport.connect(host, port, userEmail, emptyPassword);
byte[] response = String.format("user=%s\1auth=Bearer %s\1\1", userEmail,
oauthToken).getBytes();
response = BASE64EncoderStream.encode(response);
transport.issueCommand("AUTH XOAUTH2 " + new String(response),
235);
return transport;
}
public synchronized void sendMail(String subject, String body, String user,
String oauthToken, String recipients) {
try {
SMTPTransport smtpTransport = connectToSmtp("smtp.gmail.com",
587,
user,
oauthToken,
true);
MimeMessage message = new MimeMessage(session);
DataHandler handler = new DataHandler(new ByteArrayDataSource(body.getBytes(), "text/plain"));
message.setSender(new InternetAddress(user));
message.setSubject(subject);
message.setDataHandler(handler);
if (recipients.indexOf(',') > 0)
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipients));
else
message.setRecipient(Message.RecipientType.TO, new InternetAddress(recipients));
smtpTransport.sendMessage(message, message.getAllRecipients());
} catch (Exception e) {
}
}
Unfortunately, the code just doesn't work. I stuck with this for over three weeks and nothing so far. Any suggestions?