public class JwtUtils {
public static String createJWT(String id, String subject, long ttlMillis) {
SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256;
long nowMillis = System.currentTimeMillis();
Date now = new Date(nowMillis);
SecretKey secretKey = generalKey();
JwtBuilder builder = Jwts.builder().setId(id).setSubject(subject) // 主題
.setIssuer("user") // 簽發者
.setIssuedAt(now) // 簽發時間
.signWith(signatureAlgorithm, secretKey); // 簽名算法以及密匙
if (ttlMillis >= 0) {
long expMillis = nowMillis + ttlMillis;
Date expDate = new Date(expMillis);
builder.setExpiration(expDate); // 過期時間
}
return builder.compact();
}
public static CheckResult validateJWT(String jwtStr) {
CheckResult checkResult = new CheckResult();
Claims claims = null;
try {
claims = parseJWT(jwtStr);
checkResult.setSuccess(true);
checkResult.setClaims(claims);
} catch (ExpiredJwtException e) {
checkResult.setErrCode(SystemConstant.JWT_ERRCODE_EXPIRE);
checkResult.setSuccess(false);
} catch (SignatureException e) {
checkResult.setErrCode(SystemConstant.JWT_ERRCODE_FAIL);
checkResult.setSuccess(false);
} catch (Exception e) {
checkResult.setErrCode(SystemConstant.JWT_ERRCODE_FAIL);
checkResult.setSuccess(false);
}
return checkResult;
}
public static SecretKey generalKey() {
byte[] encodedKey = Base64.decode(SystemConstant.JWT_SECERT);
SecretKey key = new SecretKeySpec(encodedKey, 0, encodedKey.length, "AES");
return key;
}
public static Claims parseJWT(String jwt) throws Exception {
SecretKey secretKey = generalKey();
return Jwts.parser().setSigningKey(secretKey).parseClaimsJws(jwt).getBody();
}
}