Example usage for org.apache.commons.net.smtp SMTPCommand AUTH

Introduction

In this page you can find the example usage for org.apache.commons.net.smtp SMTPCommand AUTH.

Prototype

int AUTH

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Document

The authorization command

Usage

From source file:de.burlov.ultracipher.core.mail.AuthenticatingSMTPClient.java

/**
 * Authenticate to the SMTP server by sending the AUTH command with the
 * selected mechanism, using the given username and the given password.
 * <p/>/*from w  ww  .  j  a  va  2  s. c o m*/
 *
 * @return True if successfully completed, false if not.
 * @throws SMTPConnectionClosedException              If the SMTP server prematurely closes the connection as a
 *                                                    result of the client being idle or some other reason
 *                                                    causing the server to send SMTP reply code 421. This
 *                                                    exception may be caught either as an IOException or
 *                                                    independently as itself.
 * @throws java.io.IOException                        If an I/O error occurs while either sending a command to
 *                                                    the server or receiving a reply from the server.
 * @throws java.security.NoSuchAlgorithmException     If the CRAM hash algorithm cannot be instantiated by the
 *                                                    Java runtime system.
 * @throws java.security.InvalidKeyException          If the CRAM hash algorithm failed to use the given
 *                                                    password.
 * @throws java.security.spec.InvalidKeySpecException If the CRAM hash algorithm failed to use the given
 *                                                    password.
 *                                                    *
 */
public boolean auth(AUTH_METHOD method, String username, String password)
        throws IOException, NoSuchAlgorithmException, InvalidKeyException, InvalidKeySpecException {
    if (!SMTPReply.isPositiveIntermediate(sendCommand(SMTPCommand.AUTH, AUTH_METHOD.getAuthName(method)))) {
        return false;
    }

    if (method.equals(AUTH_METHOD.PLAIN)) {
        // the server sends an empty response ("334 "), so we don't have to
        // read it.
        return SMTPReply.isPositiveCompletion(sendCommand(
                new String(Base64.encodeBase64(("\000" + username + "\000" + password).getBytes()))));
    } else if (method.equals(AUTH_METHOD.CRAM_MD5)) {
        // get the CRAM challenge
        byte[] serverChallenge = Base64.decodeBase64(getReplyString().substring(4).trim());
        // get the Mac instance
        Mac hmac_md5 = Mac.getInstance("HmacMD5");
        hmac_md5.init(new SecretKeySpec(password.getBytes(), "HmacMD5"));
        // compute the result:
        byte[] hmacResult = _convertToHexString(hmac_md5.doFinal(serverChallenge)).getBytes();
        // join the byte arrays to form the reply
        byte[] usernameBytes = username.getBytes();
        byte[] toEncode = new byte[usernameBytes.length + 1 /* the space */ + hmacResult.length];
        System.arraycopy(usernameBytes, 0, toEncode, 0, usernameBytes.length);
        toEncode[usernameBytes.length] = ' ';
        System.arraycopy(hmacResult, 0, toEncode, usernameBytes.length + 1, hmacResult.length);
        // send the reply and read the server code:
        return SMTPReply.isPositiveCompletion(sendCommand(new String(Base64.encodeBase64(toEncode))));
    } else if (method.equals(AUTH_METHOD.LOGIN)) {
        // the server sends fixed responses (base64("Username") and
        // base64("Password")), so we don't have to read them.
        if (!SMTPReply
                .isPositiveIntermediate(sendCommand(new String(Base64.encodeBase64(username.getBytes()))))) {
            return false;
        }
        return SMTPReply
                .isPositiveCompletion(sendCommand(new String(Base64.encodeBase64(password.getBytes()))));
    } else {
        return false; // safety check
    }
}

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