/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you 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 io.netty.handler.ipfilter;

import io.netty.channel.Channel;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;

import java.net.InetSocketAddress;
import java.net.SocketAddress;

This class allows one to filter new Channels based on the IpFilterRules passed to its constructor. If no rules are provided, all connections will be accepted. If you would like to explicitly take action on rejected Channels, you should override AbstractRemoteAddressFilter<InetSocketAddress>.channelRejected(ChannelHandlerContext, InetSocketAddress). /**
 * This class allows one to filter new {@link Channel}s based on the
 * {@link IpFilterRule}s passed to its constructor. If no rules are provided, all connections
 * will be accepted.
 *
 * If you would like to explicitly take action on rejected {@link Channel}s, you should override
 * {@link #channelRejected(ChannelHandlerContext, SocketAddress)}.
 */
@Sharable
public class RuleBasedIpFilter extends AbstractRemoteAddressFilter<InetSocketAddress> {

    private final IpFilterRule[] rules;

    public RuleBasedIpFilter(IpFilterRule... rules) {
        if (rules == null) {
            throw new NullPointerException("rules");
        }

        this.rules = rules;
    }

    @Override
    protected boolean accept(ChannelHandlerContext ctx, InetSocketAddress remoteAddress) throws Exception {
        for (IpFilterRule rule : rules) {
            if (rule == null) {
                break;
            }

            if (rule.matches(remoteAddress)) {
                return rule.ruleType() == IpFilterRuleType.ACCEPT;
            }
        }

        return true;
    }
}