module.exports={
    getSessionKeyByCode:{
        url:"https://api.weixin.qq.com/sns/jscode2session",
        method:"GET",
        params: {
            appid:"wx408ea534cb79567e",
            secret:"e4fe5b9c97b2d7e1a68e14163e48ac8b",
            js_code:‘‘,
            grant_type:"authorization_code"
        }
    }}

exports.service = function (req, res) {
    var code = req.query.code;
    var encryptData = decodeURIComponent(req.query.encryptData);
    reqInfo.getSessionKeyByCode.params.js_code = code;
    httpUtil.get(reqInfo.getSessionKeyByCode).then(function (data) {
        var aeskey = new Buffer(data.session_key, ‘base64‘);
        var iv = aeskey;

        // AES-128-CBC对称解密算法
        var decrypt = function (a, b, crypted){
            crypted = new Buffer(crypted, ‘base64‘);
            var decipher = crypto.createDecipheriv(‘aes-128-cbc‘, a, b);
            var decoded = decipher.update(crypted,‘base64‘,‘utf8‘);
                decoded += decipher.final(‘utf8‘);
            return decoded;
        };

        var dec = decrypt(aeskey,iv,encryptData);
        var result = {};
        try{
            result = JSON.parse(dec);
        }catch(e){
            logger.error(e);
            result = {};
        }
        res.json({
            code: 1,
            data: result
        });
    }).catch(function(err){
        logger.error(err);
        res.json({
            code: 0,
            data: {}
        });
    })
};