app.js

const koa = require("koa");
const cors = require("koa2-cors");
const mongoose = require("mongoose");
// const bodyParser = require("koa-bodyparser"); // 获取前端传输过来的数据
const koaBody = require("koa-body");
const path = require("path");
const router = require("./routes/api/index.js");
const passport = require("koa-passport");
const errorHandler = require("./middleware/errorHandler");
const routerResponse = require("./middleware/routerResponse.js");

// 实例化koa
const app = new koa();

const server = require("http").createServer(app.callback());

// app.use(bodyParser());

app.use(
  koaBody({
    multipart: true, // 支持文件上传
  })
);

// 设置跨域
app.use(cors());

// config
const dbURL = require("./config/keys").mongoURI;
// 链接数据库
mongoose
  .connect(dbURL, { useUnifiedTopology: true, useNewUrlParser: true })
  .then(() => {
    console.log("mongodb is connecting");
  })
  .catch((err) => {
    console.log(err);
  });

mongoose.set("useFindAndModify", false);

// 统一的错误处理
errorHandler(app);

// 同意的返回数据封装

app.use(routerResponse());

app.use(passport.initialize());
app.use(passport.session());

// 回调到config文件中的passport.js
require("./config/passport")(passport);

// 配置路由
app.use(router.routes()).use(router.allowedMethods());

// 配置跨域
app.use(async (ctx, next) => {
  ctx.set("Access-Control-Allow-Origin", "*");
  ctx.set("Access-Control-Allow-Headers", "authorization");
  await next();
});

const port = process.env.PORT || 5000;

app.listen(port, () => {
  console.log(`selever started on ${port}`);
});