const Koa = require("koa");
const app = new Koa();
const Router = require("koa-router");
const Bodyparse = require("koa-bodyparser");
const cors = require("koa2-cors");
const router = new Router();
let qiniu = require("qiniu");
app.use(
  Bodyparse({
    jsonLimit: "10M",
    formLimit: "10M",
    textLimit: "10M"
  })
); // 处理post请求
app.use(cors()); // 允许跨域

// const accessKey = "";   //
// const secretKey = "";
// const bucket = "";

const accessKey = "个人七牛账号里获取"; // 七牛账号
const secretKey = "个人七牛账号里获取";
let bucket = "创建的存储空间";
qiniu.conf.ACCESS_KEY = accessKey;
qiniu.conf.SECRET_KEY = secretKey;
let imageUrl = "http://upload-z2.qiniup.com"; // 你要上传的域名
let mac = new qiniu.auth.digest.Mac(accessKey, secretKey);

const imgdomain = "http://q7i3go8uq.bkt.clouddn.com"; //创建bucket是七牛自动分配的域名
let options = {
  scope: bucket
};
let config = new qiniu.conf.Config();
config.zone = qiniu.zone.Zone_z2;
var bucketManager = new qiniu.rs.BucketManager(mac, config);
let option = { limit: 20 };
// 获取前端上传七牛云所属需要的token
router.get("/gettoken", async (ctx, next) => {
  console.log("mac", mac);
  let options = {
    scope: bucket,
    expires: 3600 * 24
  };
  let putPolicy = new qiniu.rs.PutPolicy(options);
  let uploadToken = putPolicy.uploadToken(mac);
  if (uploadToken) {
    ctx.body = uploadToken;
  } else {
    ctx.body = "error";
  }
  await next();
});
//拿到数据返给前端
router.get("/imglist", async (ctx, next) => {
  await getQiniuImg(bucket,option).then((res,reject) => {
    // res.
    ctx.body = {
      code: 200,
      data: res
    };
  });
  await next();
});

/**
 * @param {}
 *
 * */
//获取七牛云上的资源列表的方法封装
function getQiniuImg(bucket,limit) {
  return new Promise((resolve, reject) => {
    bucketManager.listPrefix(bucket, limit, function (respErr, respBody, respInfo) {
      if (respBody.error) {
          respErr = {"error": respBody.error, 'status': respBody.status};
      }
      if(respBody){
        resolve(respBody)
      }else {
        reject(respInfo)
      }
    });
  });
}
app.use(async (ctx, next) => {
  await next();
});

app.use(router.routes());
app.use(router.allowedMethods());
app.listen(1000);