/**
 * 服务端token。token用于校验客户端权限。
 *
 * 此类暂时未使用，V1版本API暂时未传递此参数，V2版本API可计划增加此功能，提高系统安全性。
 *
 * HMAC: keyed-Hash Message Authentication Code
 *
 * author: Sand
 * since: 2016/11/21
 */
"use strict";

let crypto = require('crypto');
let hmac = crypto.createHmac('sha1', 'theskyisblue');

class Token{
    constructor(userId, clientId, platform){
        if(!userId || !clientId || !platform) throw {message: "Parameters must not be null."};

        hmac.update(userId + "->" + clientId + "->" + platform);
        let cipherText = hmac.digest('hex');

        this._userId = userId;
        this._clientId = clientId;
        this._platform = platform;
        this._value = cipherText;
    }

    get userId(){
        return this._userId;
    }

    get clientId(){
        return this._clientId;
    }

    get platform(){
        return this._platform;
    }

    get value(){
        return this._value;
    }
}

module.exports = Token;