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/*
 * Copyright (c) 2014, 2023 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.eclipse.angus.mail.auth;

import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.callback.UnsupportedCallbackException;
import javax.security.sasl.SaslClient;
import javax.security.sasl.SaslException;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Map;

/**
 * Jakarta Mail SASL client for OAUTH2.
 *
 * @author Bill Shannon
 * @see 
 * RFC 6749 - OAuth 2.0 Authorization Framework
 * @see 
 * RFC 6750 - OAuth 2.0 Authorization Framework: Bearer Token Usage
 */
public class OAuth2SaslClient implements SaslClient {
    private CallbackHandler cbh;
    //private Map props;	// XXX - not currently used
    private boolean complete = false;

    public OAuth2SaslClient(Map props, CallbackHandler cbh) {
        //this.props = props;
        this.cbh = cbh;
    }

    @Override
    public String getMechanismName() {
        return "XOAUTH2";
    }

    @Override
    public boolean hasInitialResponse() {
        return true;
    }

    @Override
    public byte[] evaluateChallenge(byte[] challenge) throws SaslException {
        if (complete)
            return new byte[0];

        NameCallback ncb = new NameCallback("User name:");
        PasswordCallback pcb = new PasswordCallback("OAuth token:", false);
        try {
            cbh.handle(new Callback[]{ncb, pcb});
        } catch (UnsupportedCallbackException ex) {
            throw new SaslException("Unsupported callback", ex);
        } catch (IOException ex) {
            throw new SaslException("Callback handler failed", ex);
        }

        /*
         * The OAuth token isn't really a password, and Jakarta Mail doesn't
         * use char[] for passwords, so we don't worry about storing the
         * token in strings.
         */
        String user = ncb.getName();
        String token = new String(pcb.getPassword());
        pcb.clearPassword();
        String resp = "user=" + user + "\001auth=Bearer " + token + "\001\001";
        byte[] response;
        response = resp.getBytes(StandardCharsets.UTF_8);
        complete = true;
        return response;
    }

    @Override
    public boolean isComplete() {
        return complete;
    }

    @Override
    public byte[] unwrap(byte[] incoming, int offset, int len)
            throws SaslException {
        throw new IllegalStateException("OAUTH2 unwrap not supported");
    }

    @Override
    public byte[] wrap(byte[] outgoing, int offset, int len)
            throws SaslException {
        throw new IllegalStateException("OAUTH2 wrap not supported");
    }

    @Override
    public Object getNegotiatedProperty(String propName) {
        if (!complete)
            throw new IllegalStateException("OAUTH2 getNegotiatedProperty");
        return null;
    }

    @Override
    public void dispose() throws SaslException {
    }
}