const Koa = require('koa')
const app = new Koa()
const path = require('path')
const bodyParser = require('koa-bodyparser')
const convert = require('koa-convert')
const staticCache = require('koa-static-cache')
const compress = require('koa-compress')
const cors = require('koa2-cors')

// 解析请求体
app.use(bodyParser())

// 跨域设置
app.use(convert(cors({
	allowMethods: ['GET', 'POST'],
    allowHeaders: ['Content-Type', 'Accept'],
    origin: function(ctx) {
        return '*' // 本地环境
    }
})))

// 中间件 设置gzip
app.use(compress({
    threshold: 2048,
    flush: require("zlib").Z_SYNC_FLUSH
}))

// 静态文件服务
app.use(convert(staticCache(path.join(__dirname, './'), {
    maxAge: 365 * 24 * 60 * 60,
    dynamic: false // 是否动态监测文件变化
})))

const port = 8882

// 启动程序，监听端口
app.listen(port, () => {
	console.log(`listening on port ${port} for swagger`)
})