RedisAccessTokenCache.java

/*
 * Copyright 2020 the original author or authors.
 *
 * 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 org.bremersee.security.authentication;

import java.time.Duration;
import java.util.Date;
import java.util.Optional;
import java.util.function.Function;
import javax.validation.constraints.NotNull;
import lombok.Setter;
import lombok.extern.slf4j.Slf4j;
import org.bremersee.security.authentication.AuthProperties.JwtCache;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.util.Assert;

/**
 * The redis access token cache.
 *
 * @author Christian Bremer
 */
@Slf4j
public class RedisAccessTokenCache implements AccessTokenCache {

  private final JwtCache jwtCacheProperties;

  private final StringRedisTemplate redis;

  @Setter
  @NotNull
  private Function<String, Date> findExpirationTimeFn = AccessTokenCache::getExpirationTime;

  /**
   * Instantiates a new redis access token cache.
   *
   * @param jwtCacheProperties the jwt cache properties
   * @param connectionFactory the connection factory
   */
  public RedisAccessTokenCache(
      JwtCache jwtCacheProperties,
      RedisConnectionFactory connectionFactory) {
    Assert.notNull(jwtCacheProperties, "Jwt cache properties must be present.");
    Assert.notNull(connectionFactory, "Redis connection factory must be present.");
    this.jwtCacheProperties = jwtCacheProperties;
    this.redis = new StringRedisTemplate(connectionFactory);
  }

  @Override
  public Optional<String> findAccessToken(String key) {
    try {
      return Optional.ofNullable(redis.opsForValue().get(jwtCacheProperties.addKeyPrefix(key)));

    } catch (RuntimeException e) {
      log.error("Getting access token from redis cache failed.", e);
      return Optional.empty();
    }
  }

  @Override
  public void putAccessToken(String key, String accessToken) {
    try {
      Duration duration = jwtCacheProperties.getExpirationTimeThreshold();
      long millis = System.currentTimeMillis() + duration.toMillis();
      String dbKey = jwtCacheProperties.addKeyPrefix(key);
      Optional.ofNullable(findExpirationTimeFn.apply(accessToken))
          .filter(expirationTime -> expirationTime.getTime() > millis)
          .ifPresent(expirationTime -> {
            redis.opsForValue().set(dbKey, accessToken);
            redis.expireAt(dbKey, expirationTime);
          });

    } catch (RuntimeException e) {
      log.error("Putting access token into the redis cache failed.", e);
    }
  }

}