/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2009 Sun Microsystems Inc. All Rights Reserved
 *
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the License). You may not use this file except in
 * compliance with the License.
 *
 * You can obtain a copy of the License at
 * https://opensso.dev.java.net/public/CDDLv1.0.html or
 * opensso/legal/CDDLv1.0.txt
 * See the License for the specific language governing
 * permission and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL
 * Header Notice in each file and include the License file
 * at opensso/legal/CDDLv1.0.txt.
 * If applicable, add the following below the CDDL Header,
 * with the fields enclosed by brackets [] replaced by
 * your own identifying information:
 * "Portions Copyrighted [year] [name of copyright owner]"
 *
 * $Id: AuthUtils.java,v 1.1 2009/11/12 18:37:36 veiming Exp $
 *
 * Portions Copyright 2015 ForgeRock AS.
 */

package com.sun.identity.entitlement.util;

import com.iplanet.sso.SSOToken;
import com.sun.identity.authentication.AuthContext;
import com.sun.identity.rest.AuthSPrincipal;

import java.security.Principal;
import java.util.HashSet;
import java.util.Set;
import javax.security.auth.Subject;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;

public class AuthUtils {

    private AuthUtils() {
    }
    
    public static SSOToken authenticate(
        String realm,
        String userName,
        String password
    ) throws Exception {
        AuthContext lc = new AuthContext(realm);
        lc.login();
        while (lc.hasMoreRequirements()) {
            Callback[] callbacks = lc.getRequirements();
            for (int i = 0; i < callbacks.length; i++) {
                if (callbacks[i] instanceof NameCallback) {
                    NameCallback nc = (NameCallback) callbacks[i];
                    nc.setName(userName);
                } else if (callbacks[i] instanceof PasswordCallback) {
                    PasswordCallback pc = (PasswordCallback) callbacks[i];
                    pc.setPassword(password.toCharArray());
                } else {
                    throw new Exception("No callback");
                }
            }
            lc.submitRequirements(callbacks);
        }

        return (lc.getStatus() != AuthContext.Status.SUCCESS) ? null :
            lc.getSSOToken();
    }

    public static Subject createSubject(String uuid) {
        Set<Principal> userPrincipals = new HashSet<Principal>(2);
        userPrincipals.add(new AuthSPrincipal(uuid));
        return new Subject(false, userPrincipals, new HashSet(),
            new HashSet());
    }
}