/*
 * Copyright (c) 2016 Network New Technologies Inc.
 *
 * 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 com.networknt.router;


import com.networknt.config.Config;
import com.networknt.config.ConfigException;

import java.net.URI;
import java.util.*;

public class HostWhitelist {

    private RouterConfig config;

    public  HostWhitelist() {
        config = RouterConfig.load();
    }

    public boolean isHostAllowed(URI serviceUri) {
        if (serviceUri != null) {
            List<String> hostWhitelist = config.getHostWhitelist();
            if (hostWhitelist == null || hostWhitelist.size() == 0) {
                throw new ConfigException("No whitelist defined to allow the route to " + serviceUri);
            }
            String host = serviceUri.getHost();
            return hostWhitelist.stream().anyMatch(
                    hostRegEx -> host != null && host.matches(hostRegEx));
        } else {
            return false;
        }
    }

}
