token工作机制及原理附Java生成token工具类

目录

• 什么是token

• 基于 Token 的身份验证

• 1.无状态、可扩展
• 2.安全性
• 3.可扩展性
• 4.多平台跨域
• 5.基于标准

package com.frank.common.utils;
import com.alibaba.fastjson.JSON;
import com.frank.common.entity.TokenHeader;
import com.frank.common.entity.TokenPlayload;
import com.frank.common.entity.User;
import java.rmi.server.UID;
import java.util.UUID;
/**
* Description:Token生成工具
* 第一部分我们称它为头部（header),第二部分我们称其为载荷（payload, 类似于飞机上承载的物品)，第三部分是签证（signature).
* Auth: Frank
* Date: 2017-11-02
* Time: 下午 5:05
*/
public class TokenUtil {
public static final String TOKEN_AES_KEY = "xiangli8Token";
public static final String REFREH_TOKEN_AES_KEY = "xiangli8RefreshToken";
public static final String JWT_TYP = "JWT";
public static final String JWT_ALG = "AES";
public static final String JWT_EXP = "30";
public static final String JWT_ISS = "xiangli8";
/**
* 获得token
* @param data 自定义数据
* @param <T> 自定义数据
* @return
* @throws Exception
*/
public static <T> String getToken(T data) throws Exception {
TokenPlayload<T> userTokenPlayload = new TokenPlayload<>();
userTokenPlayload.setExpData(data);
String jwt = createJWT(userTokenPlayload);
return jwt;
}
/**
* 生成jwt的header部分内容
* @return
* @throws Exception
*/
private static String tokenHeaderBase64() throws Exception {
TokenHeader tokenHeader = new TokenHeader();
tokenHeader.setTyp(JWT_TYP);
tokenHeader.setAlg(JWT_ALG);
String headerJson = JSON.toJSONString(tokenHeader);
String headerBase64 = Base64Util.encryptBASE64(headerJson.getBytes());
return headerBase64;
}
/**
* 生成jwt的payload部分内容
* @param tokenPlayload
* @param <T>自定义的数据块
* @return
* @throws Exception
*/
private static <T> String tokenPayloadBase64(TokenPlayload<T> tokenPlayload) throws Exception {
tokenPlayload.setIss(JWT_ISS);
tokenPlayload.setExp(JWT_EXP);
tokenPlayload.setIat(String.valueOf(System.currentTimeMillis()));
String headerJson =JSON.toJSONString(tokenPlayload);
String headerBase64 = Base64Util.encryptBASE64(headerJson.getBytes());
return headerBase64;
}
/**
* 生成JWT
* @return
*/
public static <T> String createJWT(TokenPlayload<T> tokenPlayload) throws Exception {
StringBuilder jwtSb = new StringBuilder();
StringBuilder headerPlayloadSb = new StringBuilder();
String tokenHeaderBase64 = tokenHeaderBase64();
String tokenPayloadBase64 = tokenPayloadBase64(tokenPlayload);
jwtSb.append(tokenHeaderBase64);
jwtSb.append(".");
jwtSb.append(tokenPayloadBase64);
jwtSb.append(".");
headerPlayloadSb.append(tokenHeaderBase64);
headerPlayloadSb.append(tokenPayloadBase64);
String headerPlayloadSalt = SaltUtil.addSalt(headerPlayloadSb.toString());
String key = AesUtil.initKey(TOKEN_AES_KEY+tokenPlayload.getIat());
String signature = Base64Util.encryptBASE64(AesUtil.encrypt(headerPlayloadSalt.getBytes(),key));
jwtSb.append(signature);
return Base64Util.encryptBASE64(jwtSb.toString().getBytes());
}
/**
* 校验token是否是服务器生成的，以防token被修改
* @param jwtBase64
* @return
* @throws Exception
*/
public static <T> boolean verifyJWT(String jwtBase64) throws Exception {
String jwt = new String (Base64Util.decryptBASE64(jwtBase64));
if(!jwt.contains(".")){
return false;
}
String[] jwts = jwt.split("\\.");
if(jwts.length<3){
return false;
}
TokenPlayload tTokenPlayload = JSON.parseObject(new String(Base64Util.decryptBASE64(jwts[1])),TokenPlayload.class);
String key = AesUtil.initKey(TOKEN_AES_KEY+tTokenPlayload.getIat());
//解析出header跟playload
StringBuilder headerPlayloadSb = new StringBuilder();
headerPlayloadSb.append(jwts[0]);
headerPlayloadSb.append(jwts[1]);
//解析signature
String headerPlayloadSalt = new String (AesUtil.decrypt(Base64Util.decryptBASE64(jwts[2]),key));
return SaltUtil.verifyPwd(headerPlayloadSb.toString(),headerPlayloadSalt);
}
public static void main(String[] args) throws Exception {
String jwt = getToken(new User(1L,"你是逗逼"));
System.out.println("jwt:"+jwt);
System.out.println("verifyJWT:"+verifyJWT(jwt));
}
}