const Koa = require('koa')
const path = require('path')
const koaStatic = require('koa-static')
const bodyParser = require('koa-bodyparser')
const session = require('koa-session-minimal')
const MysqlStore = require('koa-mysql-session')
const cors = require('koa2-cors')

const config = require('./config')
const routers = require('./routers/index')

const app = new Koa()

//跨域处理
app.use(cors({
    origin: function (ctx) {
        if (ctx.url === '/cors') {
            return "*"; // 允许来自所有域名请求
        }
        return 'http://localhost:8000';
    },
    exposeHeaders: ['WWW-Authenticate', 'Server-Authorization'],
    maxAge: 5,
    credentials: true,
    allowMethods: ['GET', 'POST', 'DELETE'],//设置允许的HTTP请求类型
    allowHeaders: ['Content-Type', 'Authorization', 'Accept'],
}))

// session存储配置
const sessionMysqlConfig= {
    user: config.database.USERNAME,
    password: config.database.PASSWORD,
    database: config.database.DATABASE,
    host: config.database.HOST,
}

// 配置session中间件
app.use(session({
    key: 'USER_SID',
    store: new MysqlStore(sessionMysqlConfig)
}))

// 配置ctx.body解析中间件
app.use(bodyParser())

// 配置静态资源加载中间件
app.use(koaStatic(
    path.join(__dirname , './static')
))

// 初始化路由中间件
app.use(routers.routes()).use(routers.allowedMethods())

// 监听启动端口
app.listen( config.port )
console.log(`the server is start at port ${config.port}`)