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This module contains the Metro WSIT runtime code.
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/*
 * Copyright (c) 1997, 2022 Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2022 Contributors to the Eclipse Foundation
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package com.sun.xml.wss;

import com.sun.xml.wss.impl.XWSSecurityRuntimeException;
import com.sun.xml.wss.impl.misc.DefaultRealmAuthenticationAdapter;
import com.sun.xml.wss.impl.misc.SecurityUtil;
import com.sun.xml.wss.util.ServletContextUtil;
import com.sun.xml.wss.util.WSSServletContextFacade;

import java.net.URL;
import java.util.Map;
import javax.security.auth.Subject;

/**
 * This abstract class defines an SPI that Metro Application developers can implement, to handle custom
 * username/password and username/Password-Digest authentication.
 *
 * The SPI implementation class needs to
 * specified as a META-INF/services entry with name "com.sun.xml.xwss.RealmAuthenticator".
 * A default implementation of this SPI is returned if no entry is configured.
 */
public abstract class RealmAuthenticationAdapter {

    public static final String UsernameAuthenticator = "com.sun.xml.xwss.RealmAuthenticator";

    /** Creates a new instance of RealmAuthenticator */
    protected RealmAuthenticationAdapter() {
    }

    /**
     *
     * @param callerSubject the callerSubject should contain the appropriate principal's of the caller after a successful authentication
     * @param username the username
     * @param password the password
     * @return true if authentication succeeds
     * @throws com.sun.xml.wss.XWSSecurityException if there is an authentication failure
     */
    public abstract boolean authenticate(Subject callerSubject, String username, String password) throws XWSSecurityException;

    /**
     *
     * @param callerSubject the callerSubject should contain the appropriate principal's of the caller after a successful authentication
     * @param username the username
     * @param password the password
     * @param runtimeProps Map of runtime properties that can be used in authentication decision
     * @return true if authentication succeeds
     * @throws com.sun.xml.wss.XWSSecurityException if there is an authentication failure
     */
    public  boolean authenticate(Subject callerSubject, String username, String password, Map runtimeProps) throws XWSSecurityException {
        //make a default implementation for backward compatibility
        return this.authenticate(callerSubject, username, password);
    }

    /**
     *
     * @param callerSubject  the callerSubject should contain the appropriate principal's of the caller after a successful authentication
     * @param username the username
     * @param passwordDigest the password-digest
     * @param nonce a nonce sent by the caller in the UsernameToken
     * @param created the creation time of the UsernameToken
     * @return true if authentication succeeds
     * @throws com.sun.xml.wss.XWSSecurityException if there is an authentication failure
     */
    public boolean authenticate(Subject callerSubject, String username, String passwordDigest, String nonce, String created) throws XWSSecurityException {
        throw new XWSSecurityException("Default Implementation : Override this authenticate method in your RealmAuthenticationAdapter");
    }

    /**
     *
     * @param callerSubject  the callerSubject should contain the appropriate principal's of the caller after a successful authentication
     * @param username the username
     * @param passwordDigest the password-digest
     * @param nonce a nonce sent by the caller in the UsernameToken
     * @param created the creation time of the UsernameToken
     * @param runtimeProps Map of runtime properties that can be used in authentication decision
     * @return true if authentication succeeds
     * @throws com.sun.xml.wss.XWSSecurityException if there is an authentication failure
     */
    public boolean authenticate(Subject callerSubject, String username, String passwordDigest, String nonce, String created, Map runtimeProps) throws XWSSecurityException {
        //make a default implementation for backward compatibility
        return this.authenticate(callerSubject, username, passwordDigest, nonce, created);
    }

    /**
     *
     * @param context optional context that can be used to locate the META-INF/services entry "com.sun.xml.xwss.RealmAuthenticator"
     * @return a new instance of the RealmAuthenticationAdapter
     */
    public static RealmAuthenticationAdapter newInstance(Object context) {
        final WSSServletContextFacade ctxt = ServletContextUtil.wrap(context);
        final URL url;
        if (ctxt == null) {
            url = SecurityUtil.loadFromClasspath("META-INF/services/" + UsernameAuthenticator);
        } else {
            url = ctxt.getResource("/META-INF/services/" + UsernameAuthenticator);
        }
        if (url != null) {
            Object obj = SecurityUtil.loadSPIClass(url, UsernameAuthenticator);
            if (obj != null && !(obj instanceof RealmAuthenticationAdapter)) {
                throw new XWSSecurityRuntimeException("Class :" + obj.getClass().getName() + " is not a valid RealmAuthenticationProvider");
            }
            return (RealmAuthenticationAdapter) obj;
        }
        return new DefaultRealmAuthenticationAdapter();
    }
}