const { execSync } = require('child_process');
const ip = require('./utils/ip');
const { port, command } = require('./config');
const express = require('express')
const app = express()
const { join } = require('path');

app.use(express.static(join(__dirname, 'public')));

app.use((req, res, next) => {
   res.header('Access-Control-Allow-Origin', '*');
   res.header('Access-Control-Allow-Methods', 'GET, POST');
   res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization, Content-Length, X-Requested-With');
   next();
});

// 提供接口，查询ubuntu server上的ipv6地址，处理字符串后，序列化为json返回.
app.get('/ip', async (req, res) => {
   let output = execSync(command, { encoding: "utf8" });
   res.json(await ip.parseNetworkInfo(output))
})

// 静态页面，调用 /ip 接口，做页面展示
app.get('/', async (req, res) => {
   res.sendFile(join(__dirname, 'public', 'index.html'));
})

app.listen(port, () => {
   console.log(`app listening on port: http://127.0.0.1:${port}`)
})