/*
* Copyright 1998-2014 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("Следующее сообщение может быть записано не менее чем через %d секунд после предыдущего", threshold/1000)
);
}
}
}