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Google's reference OAUTH2 Provider implementation isolated from Google's related utilites project over at https://github.com/google/gmail-oauth2-tools

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/* Copyright 2012 Google Inc., 2023 Benny Bottema
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.simplejavamail.google.code.samples.oauth2;

import javax.security.auth.callback.CallbackHandler;
import javax.security.sasl.SaslClient;
import javax.security.sasl.SaslClientFactory;
import java.util.Map;
import java.util.logging.Logger;

/**
 * A SaslClientFactory that returns instances of OAuth2SaslClient.
 *
 * Only the "XOAUTH2" mechanism is supported. The {@code callbackHandler} is
 * passed to the OAuth2SaslClient. Other parameters are ignored.
 */
public class OAuth2SaslClientFactory implements SaslClientFactory {
    private static final Logger logger = Logger.getLogger(OAuth2SaslClientFactory.class.getName());

    public static final String OAUTH_TOKEN_PROP = "mail.sasl.mechanisms.oauth2.oauthToken";

    public SaslClient createSaslClient(String[] mechanisms, String authorizationId, String protocol, String serverName, Map props, CallbackHandler callbackHandler) {
        for (String mechanism : mechanisms) {
            if ("XOAUTH2".equalsIgnoreCase(mechanism)) {
                return new OAuth2SaslClient((String) props.get(OAUTH_TOKEN_PROP), callbackHandler);
            }
        }
        logger.info("Failed to match any mechanisms");
        return null;
    }

    public String[] getMechanismNames(Map props) {
        return new String[] { "XOAUTH2" };
    }
}