index.js

const Koa = require('koa');
const cors = require('koa2-cors');
const path = require('path');
const bodyParser = require('koa-bodyparser');
const ejs = require('ejs');
const session = require('koa-session-minimal');
const MysqlStore = require('koa-mysql-session');
const config = require('./config/default.js');
const router = require('koa-router');
const views = require('koa-views');
const koaStatic = require('koa-static');
const staticCache = require('koa-static-cache');
const app = new Koa();
const koaBody = require('koa-body');
//设置跨域请求
app.use(cors(
  {
    origin: function (ctx) {
      return 'http://localhost:8080'; //只允许http://localhost:8080 请求
    },
    exposeHeaders: ['WWW-Authenticate', 'Server-Authorization'],
    maxAge: 5,
    credentials: true,
    allowMethods: ['GET', 'POST', 'PUT', 'DELETE'],
    allowHeaders: ['Content-Type', 'Authorization', 'Accept'],
  }
));
//文件上传
app.use(koaBody({
  multipart: true,
  formidable: {
    maxFileSize: 200 * 1024 * 1024    // 设置上传文件大小最大限制，默认2M
  }
}));
// 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)
}));
// 配置静态资源加载中间件
app.use(koaStatic(
  path.join(__dirname, './public')
));
// 缓存
app.use(staticCache(path.join(__dirname, './public'), {dynamic: true}, {
  maxAge: 365 * 24 * 60 * 60
}));
app.use(staticCache(path.join(__dirname, './images'), {dynamic: true}, {
  maxAge: 365 * 24 * 60 * 60
}));

// 配置服务端模板渲染引擎中间件
app.use(views(path.join(__dirname, './views'), {
  extension: 'ejs'
}));
app.use(bodyParser({
  formLimit: '1mb'
}));

//  路由
app.use(require('./routers/signin.js').routes());
app.use(require('./routers/signup.js').routes());
app.use(require('./routers/posts.js').routes());
app.use(require('./routers/signout.js').routes());


app.listen(config.port);

console.log(`listening on port ${config.port}`);