85 lines
2.8 KiB
Java
85 lines
2.8 KiB
Java
/*
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* This file is part of Player Analytics (Plan).
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*
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* Plan is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License v3 as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Plan is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Plan. If not, see <https://www.gnu.org/licenses/>.
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*/
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package com.djrapitops.plan.delivery.webserver;
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import com.djrapitops.plan.utilities.dev.Untrusted;
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import com.github.benmanes.caffeine.cache.Cache;
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import com.github.benmanes.caffeine.cache.Caffeine;
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import java.util.Objects;
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import java.util.concurrent.TimeUnit;
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/**
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* Simple guard against DDoS attacks to single endpoint.
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* <p>
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* This only protects against a DDoS that doesn't follow redirects.
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*
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* @author AuroraLS3
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*/
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public class RateLimitGuard {
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private static final int ATTEMPT_LIMIT = 30;
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private final Cache<String, Integer> requests = Caffeine.newBuilder()
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.expireAfterWrite(120, TimeUnit.SECONDS)
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.build();
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private final Cache<String, String> lastRequestPath = Caffeine.newBuilder()
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.expireAfterWrite(120, TimeUnit.SECONDS)
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.build();
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public boolean shouldPreventRequest(@Untrusted String accessor) {
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Integer attempts = requests.getIfPresent(accessor);
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if (attempts == null) return false;
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// Too many attempts, forbid further attempts.
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return attempts >= ATTEMPT_LIMIT;
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}
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public void increaseAttemptCount(@Untrusted String requestPath, @Untrusted String accessor) {
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String previous = lastRequestPath.getIfPresent(accessor);
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if (!Objects.equals(previous, requestPath)) {
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resetAttemptCount(accessor);
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}
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Integer attempts = requests.getIfPresent(accessor);
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if (attempts == null) {
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attempts = 0;
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}
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lastRequestPath.put(accessor, requestPath);
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requests.put(accessor, attempts + 1);
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}
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public void resetAttemptCount(@Untrusted String accessor) {
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// previous request changed
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requests.cleanUp();
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requests.invalidate(accessor);
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}
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public static class Disabled extends RateLimitGuard {
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@Override
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public boolean shouldPreventRequest(String accessor) {
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return false;
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}
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@Override
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public void increaseAttemptCount(String requestPath, String accessor) { /* Disabled */ }
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@Override
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public void resetAttemptCount(String accessor) { /* Disabled */ }
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}
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}
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