ru.org.linux.auth.FloodProtector.java Source code

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Here is the source code for ru.org.linux.auth.FloodProtector.java

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/*
 * Copyright 1998-2013 Linux.org.ru
 *    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 ru.org.linux.auth;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import org.joda.time.DateTime;
import org.springframework.stereotype.Component;
import org.springframework.validation.Errors;

import java.util.concurrent.TimeUnit;

@Component
public class FloodProtector {
    private final Cache<String, DateTime> hash = CacheBuilder.newBuilder().expireAfterWrite(30, TimeUnit.MINUTES)
            .maximumSize(100000).build();

    public enum Action {
        ADD_COMMENT(30000, 3000), ADD_TOPIC(600000, 30000);

        private final int threshold;
        private final int thresholdTrusted;

        private Action(int threshold, int thresholdTrusted) {
            this.threshold = threshold;
            this.thresholdTrusted = thresholdTrusted;
        }

        public int getThreshold() {
            return threshold;
        }

        public int getThresholdTrusted() {
            return thresholdTrusted;
        }
    }

    private boolean check(Action action, String ip, int threshold) {
        String key = action.toString() + ':' + ip;

        DateTime date = hash.getIfPresent(key);

        if (date != null) {
            if (date.plusMillis(threshold).isAfterNow()) {
                return false;
            }
        }

        hash.put(key, new DateTime());

        return true;
    }

    public void checkDuplication(Action action, String ip, boolean trusted, Errors errors) {
        int threshold = trusted ? action.getThresholdTrusted() : action.getThreshold();

        if (!check(action, ip, threshold)) {
            errors.reject(null, String.format(
                    " ?   ?     %d ? ? ",
                    threshold / 1000));
        }
    }
}