JwtTokenIdExtractor.java

/*
 * Copyright 2026 Global Crop Diversity Trust
 * Licensed under the Apache License, Version 2.0
 * See LICENSE file in project root folder or http://www.apache.org/licenses/LICENSE-2.0
 */

package org.gringlobal.custom.security.service;

import java.util.Optional;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

import lombok.extern.slf4j.Slf4j;
import org.springframework.security.oauth2.jwt.JwtDecoder;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import org.apache.commons.lang3.StringUtils;

/**
 * Component to extract {@code tokenId} from JWT token strings. Uses internal caching.
 */
@Slf4j
public class JwtTokenIdExtractor {

	private final Cache<String, Optional<String>> tokenIdCache = CacheBuilder.newBuilder().maximumSize(200).expireAfterAccess(10, TimeUnit.MINUTES).build();

	private JwtDecoder jwtDecoder;

	public JwtTokenIdExtractor(JwtDecoder jwtDecoder) {
		log.debug("Making JwtTokenIdExtractor instance");
		this.jwtDecoder = jwtDecoder;
	}

	public String getJwtTokenId(String token) {
		if (StringUtils.isBlank(token)) return null;
		try {
			return tokenIdCache.get(token, () -> {
				try {
					var jwt = jwtDecoder.decode(token);
					return Optional.of(jwt.getId());
				} catch (Exception e) {
					return Optional.empty();
				}
			}).orElse(null);
		} catch (ExecutionException e) {
			log.error("Could not deal with: {}", e.getMessage(), e);
			throw new RuntimeException(e);
		}
	}

}