src/main/java/io/streamnative/pulsar/manager/service/impl/JwtServiceImpl.java

/**
 * 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 io.streamnative.pulsar.manager.service.impl;

import io.streamnative.pulsar.manager.service.JwtService;

import io.jsonwebtoken.SignatureAlgorithm;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jws;
import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import java.util.Date;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;

@Service
public class JwtServiceImpl implements JwtService {

    private String secret;
    private int sessionTime;

    private final Map<String, String> tokens = new ConcurrentHashMap<>();

    @Autowired
    public JwtServiceImpl(@Value("${jwt.secret}") String secret,
                             @Value("${jwt.sessionTime}") int sessionTime) {
        this.secret = secret;
        this.sessionTime = sessionTime;
    }

    @Override
    public String toToken(String id) {
        return Jwts.builder()
                .setSubject(id)
                .setExpiration(expireTimeFromNow())
                .signWith(SignatureAlgorithm.HS512, secret)
                .compact();
    }

    @Override
    public Optional<String> getSubFromToken(String token) {
        try {
            Jws<Claims> claimsJws = Jwts.parser().setSigningKey(secret).parseClaimsJws(token);
            return Optional.ofNullable(claimsJws.getBody().getSubject());
        } catch (Exception e) {
            return Optional.empty();
        }
    }

    private Date expireTimeFromNow() {
        return new Date(System.currentTimeMillis() + sessionTime * 1000);
    }

    @Override
    public void setToken(String key, String value) {
        synchronized (this.tokens) {
            this.tokens.put(key, value);
        }
    }

    @Override
    public String getToken(String key) {
        return this.tokens.get(key);
    }

    @Override
    public void removeToken(String key) {
        synchronized (this.tokens) {
            this.tokens.remove(key);
        }
    }
}