/**
 * 设置 YOHO 数据
 * @author: 赵彪<bill.zhao@yoho.cn>
 * @date: 2016/6/16
 */

'use strict';
const _ = require('lodash');
const net = require('net');

/**
 * 获取 IP
 * @param {*} req
 */
const _getClientIp = req => {
    let remoteIp = req.get('X-Yoho-Real-IP') || req.get('X-Forwarded-For') || req.get('X-Real-IP') || req.ip;

    if (remoteIp.indexOf(',') > 0) {
        let arr = remoteIp.split(',');

        remoteIp = _.trim(arr[0]);
    }

    if (_.startsWith(remoteIp, '10.66.')) {
        remoteIp = req.get('X-Real-IP');
    }

    remoteIp = _.trim(remoteIp);

    if (!net.isIPv4(remoteIp)) {
        let ipv6String = remoteIp.split(':');

        remoteIp = ipv6String[ipv6String.length - 1];
    }

    return remoteIp;
};

module.exports = () => {
    return (req, res, next) => {
        let yoho = Object.assign({
            pageChannel: {}
        }, req.yoho || {});

        // IP 地址
        yoho.clientIp = _getClientIp(req);

        
        Object.assign(res.locals, yoho);
        Object.assign(req.yoho, yoho);

        next();
    };
};