import net from 'net';

function getNetworkIP() {
    return new Promise((resolve,reject)=>{
        let createConnection = net.createConnection;
        var socket = createConnection(80, 'www.***.cn);//進行socket 連接的地址
        socket.on('connect', function() {
            resolve(socket.address().address);
            socket.end();
            socket.destroy();
        });
        socket.on('error', function(e) {
            resolve('');
        });
    })
}

import si from 'systeminformation';

function getNetwork(){
    return new Promise(async (resolve, reject) => {
        let ip = await getNetworkIP();
        si.networkInterfaces().then(data => {
            data.map((val)=>{
                if(val.ip4==ip){
                    resolve(val);
                }
            })
        }).catch(error => {
            reject();
        });
    })
}

// 獲取客戶端ip地址
app.get('/ip', function (req, res) {
? var clientIp = getIp(req)
? console.log('客戶端ip',clientIp)
? res.json({'youIp':clientIp});
})
//通過req的hearers來獲取客戶端ip
var getIp = function(req) {
? var ip = req.headers['x-real-ip'] || req.headers['x-forwarded-for'] || req.connection.remoteAddres || req.socket.remoteAddress || '';
? if(ip.split(',').length>0){
? ? ip = ip.split(',')[0];
? }
? return ip;
};