/**
 * Copyright 2007-2016, Kaazing Corporation. All rights reserved.
 *
 * 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.kaazing.gateway.transport.http.security.auth;

import java.util.ArrayList;
import java.util.List;

public final class WWWAuthenticateHeaderUtils {

    private WWWAuthenticateHeaderUtils() {
        // Utility class
    }

    static String[] splitWWWAuthenticateHeaderBySchemes(String headerValue) {
        return headerValue.split(",\\s(?=[^\\s]+\\srealm=)");
    }

    public static List<WWWAuthChallenge> getChallenges(String headerValue) {
        List<WWWAuthChallenge> challenges = new ArrayList<>();
        for (String challenge : splitWWWAuthenticateHeaderBySchemes(headerValue)) {
            challenges.add(new WWWAuthChallenge(challenge));
        }
        return challenges;
    }

}
