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+package com.macro.mall.security.util;
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+
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+import io.jsonwebtoken.Claims;
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+import io.jsonwebtoken.Jwts;
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+import io.jsonwebtoken.SignatureAlgorithm;
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+import org.slf4j.Logger;
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+import org.slf4j.LoggerFactory;
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+import org.springframework.beans.factory.annotation.Value;
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+import org.springframework.security.core.userdetails.UserDetails;
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+
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+import java.util.Date;
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+import java.util.HashMap;
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+import java.util.Map;
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+
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+/**
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+ * JwtToken生成的工具类
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+ * JWT token的格式:header.payload.signature
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+ * header的格式(算法、token的类型):
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+ * {"alg": "HS512","typ": "JWT"}
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+ * payload的格式(用户名、创建时间、生成时间):
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+ * {"sub":"wang","created":1489079981393,"exp":1489684781}
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+ * signature的生成算法:
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+ * HMACSHA512(base64UrlEncode(header) + "." +base64UrlEncode(payload),secret)
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+ * Created by macro on 2018/4/26.
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+ */
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+public class JwtTokenUtil {
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+ private static final Logger LOGGER = LoggerFactory.getLogger(JwtTokenUtil.class);
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+ private static final String CLAIM_KEY_USERNAME = "sub";
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+ private static final String CLAIM_KEY_CREATED = "created";
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+ @Value("${jwt.secret}")
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+ private String secret;
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+ @Value("${jwt.expiration}")
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+ private Long expiration;
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+ @Value("${jwt.tokenHead}")
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+ private String tokenHead;
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+
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+ /**
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+ * 根据负责生成JWT的token
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+ */
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+ private String generateToken(Map<String, Object> claims) {
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+ return Jwts.builder()
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+ .setClaims(claims)
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+ .setExpiration(generateExpirationDate())
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+ .signWith(SignatureAlgorithm.HS512, secret)
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+ .compact();
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+ }
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+
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+ /**
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+ * 从token中获取JWT中的负载
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+ */
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+ private Claims getClaimsFromToken(String token) {
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+ Claims claims = null;
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+ try {
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+ claims = Jwts.parser()
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+ .setSigningKey(secret)
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+ .parseClaimsJws(token)
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+ .getBody();
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+ } catch (Exception e) {
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+ LOGGER.info("JWT格式验证失败:{}", token);
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+ }
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+ return claims;
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+ }
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+
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+ /**
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+ * 生成token的过期时间
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+ */
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+ private Date generateExpirationDate() {
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+ return new Date(System.currentTimeMillis() + expiration * 1000);
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+ }
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+
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+ /**
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+ * 从token中获取登录用户名
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+ */
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+ public String getUserNameFromToken(String token) {
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+ String username;
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+ try {
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+ Claims claims = getClaimsFromToken(token);
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+ username = claims.getSubject();
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+ } catch (Exception e) {
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+ username = null;
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+ }
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+ return username;
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+ }
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+
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+ /**
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+ * 验证token是否还有效
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+ *
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+ * @param token 客户端传入的token
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+ * @param userDetails 从数据库中查询出来的用户信息
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+ */
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+ public boolean validateToken(String token, UserDetails userDetails) {
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+ String username = getUserNameFromToken(token);
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+ return username.equals(userDetails.getUsername()) && !isTokenExpired(token);
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+ }
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+
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+ /**
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+ * 判断token是否已经失效
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+ */
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+ private boolean isTokenExpired(String token) {
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+ Date expiredDate = getExpiredDateFromToken(token);
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+ return expiredDate.before(new Date());
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+ }
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+
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+ /**
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+ * 从token中获取过期时间
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+ */
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+ private Date getExpiredDateFromToken(String token) {
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+ Claims claims = getClaimsFromToken(token);
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+ return claims.getExpiration();
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+ }
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+
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+ /**
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+ * 根据用户信息生成token
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+ */
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+ public String generateToken(UserDetails userDetails) {
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+ Map<String, Object> claims = new HashMap<>();
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+ claims.put(CLAIM_KEY_USERNAME, userDetails.getUsername());
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+ claims.put(CLAIM_KEY_CREATED, new Date());
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+ return generateToken(claims);
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+ }
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+
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+ /**
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+ * 判断token是否可以被刷新
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+ */
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+ private boolean canRefresh(String token) {
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+ return !isTokenExpired(token);
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+ }
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+
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+
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+ /**
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+ * 当原来的token没过期是可以刷新
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+ *
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+ * @param oldToken 带tokenHead的token
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+ */
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+ public String refreshHeadToken(String oldToken) {
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+ String token = oldToken.substring(tokenHead.length());
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+ if (canRefresh(token)) {
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+ Claims claims = getClaimsFromToken(token);
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+ claims.put(CLAIM_KEY_CREATED, new Date());
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+ return generateToken(claims);
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+ }
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+ return null;
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+ }
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+}
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