/*
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* Copyright [2020-2030] [https://www.stylefeng.cn]
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Guns采用APACHE LICENSE 2.0开源协议，您在使用过程中，需要注意以下几点：
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*
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* 1.请不要删除和修改根目录下的LICENSE文件。
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* 2.请不要删除和修改Guns源码头部的版权声明。
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* 3.请保留源码和相关描述文件的项目出处，作者声明等。
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* 4.分发源码时候，请注明软件出处 https://gitee.com/stylefeng/guns
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* 5.在修改包名，模块名称，项目代码等时，请注明软件出处 https://gitee.com/stylefeng/guns
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* 6.若您的项目无法满足以上几点，可申请商业授权
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*/
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package cn.stylefeng.roses.kernel.security.count;
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import cn.hutool.core.convert.Convert;
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import cn.stylefeng.roses.kernel.cache.api.CacheOperatorApi;
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import cn.stylefeng.roses.kernel.cache.api.constants.CacheConstants;
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import cn.stylefeng.roses.kernel.security.api.CountValidatorApi;
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import cn.stylefeng.roses.kernel.security.api.constants.CounterConstants;
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import cn.stylefeng.roses.kernel.security.api.exception.CountValidateException;
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import cn.stylefeng.roses.kernel.security.api.exception.enums.CountValidateExceptionEnum;
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/**
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* 默认的计数校验器
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*
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* @author fengshuonan
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* @date 2020/11/15 12:14
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*/
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public class DefaultCountValidator implements CountValidatorApi {
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private final CacheOperatorApi<Long> cacheOperatorApi;
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public DefaultCountValidator(CacheOperatorApi<Long> cacheOperatorApi) {
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this.cacheOperatorApi = cacheOperatorApi;
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}
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@Override
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public synchronized void countAndValidate(String key, Long timeWindowSeconds, Long timeWindowMaxCount) throws CountValidateException {
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// 获取当前时间的秒数
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long currentTimeSeconds = System.currentTimeMillis() / 1000;
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// 上一次操作时间秒数的缓存key COUNT_VALIDATE:key:RECORD_SECONDS
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String recordTimeSecondsKey = CounterConstants.COUNT_VALIDATE_CACHE_KEY_PREFIX + CacheConstants.CACHE_DELIMITER + key + CacheConstants.CACHE_DELIMITER + CounterConstants.RECORD_TIME_SECONDS;
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// 上一次执行次数的记录缓存key COUNT_VALIDATE:key:COUNT_NUMBER
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String countNumberKey = CounterConstants.COUNT_VALIDATE_CACHE_KEY_PREFIX + CacheConstants.CACHE_DELIMITER + key + CacheConstants.CACHE_DELIMITER + CounterConstants.COUNT_NUMBER;
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// 获取缓存中上一次操作时间秒数
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Object recordTimeSecondsObject = cacheOperatorApi.get(recordTimeSecondsKey);
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Long recordTimeSeconds = Convert.toLong(recordTimeSecondsObject);
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if (recordTimeSeconds == null) {
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recordTimeSeconds = currentTimeSeconds;
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}
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// 获取缓存中上一次执行次数的记录
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Object countNumberObject = cacheOperatorApi.get(countNumberKey);
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Long countNumber = Convert.toLong(countNumberObject);
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if (countNumber == null) {
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countNumber = 0L;
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}
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// 当前时间和记录时间的差 超过限制的时间段就归零计数，否则就直接加1
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if ((currentTimeSeconds - recordTimeSeconds) == timeWindowSeconds) {
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countNumber = 0L;
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} else if ((currentTimeSeconds - recordTimeSeconds) > timeWindowSeconds) {
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countNumber = 0L;
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} else if ((currentTimeSeconds - recordTimeSeconds) < timeWindowSeconds) {
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countNumber = countNumber + 1;
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} else if (recordTimeSeconds.equals(currentTimeSeconds)) {
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countNumber = countNumber + 1;
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}
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cacheOperatorApi.put(recordTimeSecondsKey, currentTimeSeconds, timeWindowSeconds);
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cacheOperatorApi.put(countNumberKey, countNumber, timeWindowSeconds);
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// 如果记录次数大于了时间窗内的最大容许值，则抛出异常
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if (countNumber > timeWindowMaxCount) {
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throw new CountValidateException(CountValidateExceptionEnum.INTERRUPT_EXECUTION);
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}
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}
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}
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