又拍云 Node.js 实现文件上传、删除

node.js 服务端

使用 node.js + express.js 实现 服务端

const express = require("express");
const app = express();
const axios = require('axios');

app.set('port', process.env.port || 8082);

// 静态资源目录，这里放在了根目录，生产环境不允许这样
app.use(express.static(__dirname));

// 启动一个端口为 8082 的服务器
app.listen(app.get('port'), () => {
  console.log("http://localhost:" +  app.get('port'));
});

准备 base64、hmac-sha1、md5 实现签名认证

详见：http://docs.upyun.com/api/authorization/#_5

const crypto = require("crypto");

// md5
function md5(value) {
  return crypto
    .createhash("md5")
    .update(value)
    .digest("hex");
}

// base64
function base64(value) {
  return buffer.from(value).tostring("base64");
}

// hmacsha1
function hmacsha1(secret, value) {
    return crypto.createhmac('sha1', secret).update(value, 'utf-8').digest().tostring('base64');
}

上传、删除接口

const date = new date().togmtstring();
const bucketname = "";  // 空间名
const key = ""; // 操作员
const secret = ""; // 密码
const upyunurl = 'http://v0.api.upyun.com/'

// upload
app.get("/api/token/upload", (req, res) => {
  let filename = (math.random() * 100000000) >>> 0;
  let expiration = ((date.now() / 1000) >>> 0) + 30 * 60;  // 请求的过期时间，unix utc 时间戳，单位秒。建议设为 30 分钟 http://docs.upyun.com/api/form_api/
  let method = "post";

  let policy = base64(
    json.stringify({
      bucket: bucketname,
      // "save-key": "/" + filename + "{.suffix}",
      "save-key": "/{filename}{.suffix}",
      expiration: expiration
    })
  );

  let authorization =
    "upyun " +
    key +
    ":" +
    hmacsha1(md5(secret), method + "&/" + bucketname + "&" + policy);

  res.json({
    msg: "ok",
    code: 200,
    data: {
      authorization: authorization,
      policy: policy
    }
  });
});

// delete
app.get('/api/token/del', (req, res) => {
  let item = req.query.item;
  let method = "delete"
  let authorization = "upyun " +
    key +
    ":" + 
    hmacsha1(md5(secret), method + '&/' + bucketname + item + '&'+ date);


  axios({
    url: upyunurl + bucketname + item,
    method: 'delete',
    headers: {
      'authorization': authorization,
      'date': date
    }
  }).then(response => {
    res.json({
      msg: "ok",
      code: 200,
      data: {}
    });  
  }).catch(err => {
    console.log('err', err)
  })
})

跨域接口调用

const cors = require('cors');

// cors @see https://github.com/expressjs/cors
app.use(cors());

前端

前端使用 vue.js 实现

引入 bootstrap.css

<link rel="stylesheet" type="text/css" href="https://unpkg.com/bootstrap@4.1.3/dist/css/bootstrap.css">
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<!-- html -->
<div id="app">
  <div class="card" style="margin: 50px auto; width: 300px;">
    <div class="card-body">
      <h5 class="card-title">upyun upload & delete</h5>
      <div class="card-text">
        <div class="form-group">
          <label for="file">upload</label>
          <input type="file" id="file" class="form-control-file" @change="onchange">
          <div class="form-text text-muted">
            <ul>
               <li v-for="(item, index) in files">
                 {{item}} <a href="javascript:;" @click="ondel(item, index)">del</a>
               </li>
            </ul>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>

引入 vue.js、axios

<script src="https://unpkg.com/vue@2.5.17/dist/vue.js"></script>
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>

js

const upurl = 'http://v0.api.upyun.com/'  // +空间名，如：http://v0.api.upyun.com/yun-temp
    const baseapi = 'http://localhost:8082/api/'
    let uploadinput;

    let app = new vue({
      el: '#app',
      data: {
        files: []
      },
      methods: {
        onchange: function () {
          gettoken(token => {
            let formdata = new formdata();
            formdata.append("file", uploadinput.files[0])
            formdata.append('policy', token.policy)
            formdata.append("authorization", token.authorization)

            axios({
              method: 'post',
              url: upurl,
              data: formdata
            }).then(res => {
              res = res || {}

              if (res.status !== 200) {
                console.log('error')
                return
              }

              let data = res.data || {}
              this.files.push(data.url)
              alert('success')
            }).catch(err => {
              console.log(err);
            });
          });
        },
        ondel: function (item, index) {
          this.files.splice(index, 1)
          axios.request({
            url: baseapi + 'token/del',
            method: 'get',
            params: {
              item: encodeuri(item)
            }
          }).then(res => {
            alert('deleted.')
          }).catch(err => {
            console.log(err)
          })
        }
      },
      mounted () {
        uploadinput = $('file')
      }
    })

    // dom 获取元素
    function $ (el) {
      return document.getelementbyid(el)
    }

    // 获取 token
    function gettoken (fn) {
      let token = window.localstorage.getitem('token');
      token = json.parse(token) || {};
      let nowtime = date.now();

      if (nowtime < token.expired && token.authorization && token.policy) {
        fn(token)
        return
      }

      axios({
        method: 'get',
        url: baseapi + 'token/upload'
      })
      .then(res => {
        let data = res.data || {}
        data = data.data || {}
        const authorization = data.authorization
        const policy = data.policy
        const expired = ((date.now() / 1000) >>> 0) + 30 * 60;

        token = {
          authorization,
          policy,
          expired
        }

        fn(token)
        window.localstorage.setitem('token', json.stringify(token))
      });
    }

项目源码

https://github.com/givebest/upyun-upload-delete-node.js

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