var crypto = require("crypto");
var token = {
createToken: function(obj, timeout) {
//后来加的时效性 token在30内都是有效的
var timeout = 300000;
console.log(parseInt(timeout) || 0);
var obj2 = {
data: obj, //payload
created: parseInt(Date.now() / 1000), //token生成的时间的，单位秒
exp: parseInt(timeout) || 10 //token有效期
};
//payload信息
var base64Str = Buffer.from(JSON.stringify(obj2), "utf8").toString("base64");
//添加签名，防篡改
var secret = "piggyyao.com";
var hash = crypto.createHmac('sha256', secret);
hash.update(base64Str);
var signature = hash.digest('base64');
return base64Str + "." + signature;
},
decodeToken: function(token) {
var decArr = token.split(".");
if(decArr.length < 2) {
//token不合法
return false;
}
var payload = {};
//将payload json字符串 解析为对象
try {
payload = JSON.parse(Buffer.from(decArr[0], "base64").toString("utf8"));
} catch(e) {
return false;
}
//检验签名
var secret = "piggyyao.com";
var hash = crypto.createHmac('sha256', secret);
hash.update(decArr[0]);
var checkSignature = hash.digest('base64');
return {
payload: payload,
signature: decArr[1],
checkSignature: checkSignature
}
},
checkToken: function(token) {
var resDecode = this.decodeToken(token);
if(!resDecode) {
return false;
}
//是否过期
var expState = (parseInt(Date.now() / 1000) - parseInt(resDecode.payload.created)) > parseInt(resDecode.payload.exp) ? false : true;
if(resDecode.signature === resDecode.checkSignature && expState) {
return true;
}
return false;
}
}
module.exports = exports = token;
