nodekoa2实现上传图片并且同步上传到七牛云存储

const Koa = require('koa');
const route = require('koa-route');
const serve = require('koa-static');
const inspect = require('util').inspect
const path = require('path')
const os = require('os')
const fs = require('fs')
const Busboy = require('busboy')
const qiniu = require('qiniu')
const qiniuCOnfig= require('./qiniuconfig')

 
const app = new Koa();

app.use(serve(__dirname + '/public/'));

 
// 写入目录
const mkdirsSync = (dirname) => {
 if (fs.existsSync(dirname)) {
  return true
 } else {
  if (mkdirsSync(path.dirname(dirname))) {
   fs.mkdirSync(dirname)
   return true
  }
 }
 return false
}

function getSuffix (fileName) {
 return fileName.split('.').pop()
}

// 重命名
function Rename (fileName) {
 return Math.random().toString(16).substr(2) + '.' + getSuffix(fileName)
}
// 删除文件
function removeTemImage (path) {
 fs.unlink(path, (err) => {
  if (err) {
   throw err
  }
 })
}
// 上传到七牛
function upToQiniu (filePath, key) {
 const accessKey = qiniuConfig.accessKey // 你的七牛的accessKey
 const secretKey = qiniuConfig.secretKey // 你的七牛的secretKey
 const mac = new qiniu.auth.digest.Mac(accessKey, secretKey)

 const optiOns= {
  scope: qiniuConfig.scope // 你的七牛存储对象
 }
 const putPolicy = new qiniu.rs.PutPolicy(options)
 const uploadToken = putPolicy.uploadToken(mac)

 const cOnfig= new qiniu.conf.Config()
 // 空间对应的机房
 config.zOne= qiniu.zone.Zone_z2
 const localFile = filePath
 const formUploader = new qiniu.form_up.FormUploader(config)
 const putExtra = new qiniu.form_up.PutExtra()
 // 文件上传
 return new Promise((resolved, reject) => {
  formUploader.putFile(uploadToken, key, localFile, putExtra, function (respErr, respBody, respInfo) {
   if (respErr) {
    reject(respErr)
   }
   if (respInfo.statusCode == 200) {
    resolved(respBody)
   } else {
    resolved(respBody)
   }
  })
 })

}

// 上传到本地服务器
function uploadFile (ctx, options) {
 const _emmiter = new Busboy({headers: ctx.req.headers})
 const fileType = options.fileType
 const filePath = path.join(options.path, fileType)
 const cOnfirm= mkdirsSync(filePath)
 if (!confirm) {
  return
 }
 console.log('start uploading...')
 return new Promise((resolve, reject) => {
  _emmiter.on('file', function (fieldname, file, filename, encoding, mimetype) {
   const fileName = Rename(filename)
   const saveTo = path.join(path.join(filePath, fileName))
   file.pipe(fs.createWriteStream(saveTo))
   file.on('end', function () {
    resolve({
     imgPath: `/${fileType}/${fileName}`,
     imgKey: fileName
    })
   })
  })

  _emmiter.on('finish', function () {
   console.log('finished...')
  })

  _emmiter.on('error', function (err) {
   console.log('err...')
   reject(err)
  })

  ctx.req.pipe(_emmiter)
 })
}



app.use(route.post('/upload', async function(ctx, next) {

  const serverPath = path.join(__dirname, './uploads/')
 // 获取上存图片
 const result = await uploadFile(ctx, {
  fileType: 'album',
  path: serverPath
 })
 const imgPath = path.join(serverPath, result.imgPath)
 // 上传到七牛
 const qiniu = await upToQiniu(imgPath, result.imgKey)
 // 上存到七牛之后 删除原来的缓存图片
 removeTemImage(imgPath)
 ctx.body = {
  imgUrl: `http://xxxxx(你的外链或者解析后七牛的路径)/${qiniu.key}`
 }
}));
 
app.listen(3001);

console.log('listening on port 3001');