小程序通用对接oss文件的上传带上传进度条

首先小程序上传oss需要的参数，oss管理后台可以得到AccessKeySecret，OSSAccessKeyId，以及上传的地址url,signature和policy需要借助一些插件完成，也可以让后端生成以后返回，那我们前端该怎么操作呢

uploadAliyun.js的封装，只需要修改config配置文件里的参数，其他的完全可以拿过来直接在项目中使用

import Taro from '@tarojs/taro'
require('./hmac.js');
require('./sha1.js');
const Base64 = require('./Base64.js');
const Crypto = require('./crypto.js');
import {getStorage} from './tools'
const config = {//oss配置文件
  showHost: 'https://xxxx.com', //回显文件对应的本公司映射地址
  //aliyun OSS config
  host: 'https://xxxx-sh.oss-cn-shanghai.aliyuncs.com', //上传的oss地址
  AccessKeySecret: 'xxx', // 这里的配置找运维或者阿里云OSS的管理者要对应的账号和密钥就可以了
  OSSAccessKeyId: 'xx', // 这里的配置找运维或者阿里云OSS的管理者要对应的账号和密钥就可以了
  timeout: 87600 //这个是上传文件时Policy的失效时间
};
const getPolicyBase64 = function () {
  let timeOut = 87600;
  let date = new Date()
  date.setHours(date.getHours() + timeOut);
  let srcT = date.toISOString();
  const policyText = {
    "expiration": srcT, //设置该Policy的失效时间
    "conditions": [
      ["content-length-range", 0, 300 * 1024 * 1024] // 设置上传文件的大小限制,50mb
    ]
  };
  const policyBase64 = Base64.encode(JSON.stringify(policyText));
  return policyBase64;
}
const policyBase64 = getPolicyBase64();
const getSignature = function (policyBase64) {
  const accesskey = config.AccessKeySecret;
  const bytes = Crypto.HMAC(Crypto.SHA1, policyBase64, accesskey, {
    asBytes: true
  });
  const signature = Crypto.util.bytesToBase64(bytes);
  return signature;
}
const signature = getSignature(policyBase64);
export const uploadFile = function (filePath,callBack) {
  //获取文件后缀名
  const fileExt = filePath.substring(filePath.lastIndexOf('.') + 1);
  const time = new Date().getTime();
 const previewPath=`${config.showHost}/store/admin/poster/article/${time}.${fileExt}`};
  return new Promise((resolve, reject) => {
    const uploadTask= wx.uploadFile({
      url: config.host,
      filePath: filePath,
      name: 'file',
      formData: {
        'key': `store/admin/poster/article/${time}.${fileExt}`, //存放host域名下的具体地址
        'policy': policyBase64,//上面已经生成的
        'OSSAccessKeyId': config.OSSAccessKeyId,
        'signature': signature,//上面已经生成的
        'success_action_status': '200',
      },
      header: {
        Authorization: getStorage('userInfo') && JSON.parse(getStorage('userInfo')).token,
        'PLATFORM': getStorage('userInfo') && JSON.parse(getStorage('userInfo')).platfrom
      },
      success: function (res) {
        Taro.hideLoading();
        if (res.statusCode == 200) {
          //resolve对应的显示地址
          resolve({previewPath})
        } else if (res.statusCode == 500) {
          Taro.showToast({
            title: '上传失败！',
            icon: 'none',
            duration: 1500
          });
          throw new Error('上传失败！');
        }
      },
      fail: function (err) {
        Taro.hideLoading();
        throw new Error(err);
      },
    })
    //监听上传进度
    uploadTask.onProgressUpdate((progressInfo) => {
        callBack&&callBack(progressInfo.progress)
    })
  })
}

上传成功oss返回的信息

上传成功以后oss只给出成功的响应，并没有从新把地址给我们，本来也是知道地址的，在成功以后直接resolve(显示地址)，这里我们会映射一个属于自己服务器的图片地址，避免直接用oss的图片地址引起跨域

组件中使用

upLoadMp4=()=>{
    let {progress}=this.state;
    Taro.chooseMedia({
      count: 1,//传一个
      mediaType: ['video'],
      sourceType: ['album', 'camera'], // album 从相册选视频，camera 使用相机拍摄
      // maxDuration: 60, // 拍摄视频最长拍摄时间，单位秒。最长支持60秒
      camera: 'back',//默认拉起的是前置或者后置摄像头，默认back
      compressed: false,//是否压缩所选择的视频文件
      success:async(res)=>{
          let tempFilePath = res.tempFiles[0].tempFilePath;;//选择定视频的临时文件路径（本地路径）
          let size = parseFloat( res.tempFiles[0].size/1024/1024).toFixed(1) //选定视频的数据量大小
              if(size>50){
                  Taro.showToast({
                    title: '上传视频过大',
                    icon: 'none',
                    duration: 2000
                  })
              }else{
                Taro.showLoading({
                  title: `上传中${progress}`,
                  icon: 'loading',
                  mask: true
               })
               let {previewPath}=await uploadFile(tempFilePath,(progress)=>{
                  console。log(progress)//这里获取上传的进度
               });
              }
          
      },

需要的插件

• Base64.js

npm install --save js-base64
import { Base64 } from 'js-base64'

也可以直接引入

const Base64 = {

  // private property
  _keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

  // public method for encoding
  encode: function (input) {
    var output = "";
    var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
    var i = 0;

    input = Base64._utf8_encode(input);

    while (i < input.length) {

      chr1 = input.charCodeAt(i++);
      chr2 = input.charCodeAt(i++);
      chr3 = input.charCodeAt(i++);

      enc1 = chr1 >> 2;
      enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
      enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
      enc4 = chr3 & 63;

      if (isNaN(chr2)) {
        enc3 = enc4 = 64;
      } else if (isNaN(chr3)) {
        enc4 = 64;
      }

      output = output +
        this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
        this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

    }

    return output;
  },

  // public method for decoding
  decode: function (input) {
    var output = "";
    var chr1, chr2, chr3;
    var enc1, enc2, enc3, enc4;
    var i = 0;

    input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

    while (i < input.length) {

      enc1 = this._keyStr.indexOf(input.charAt(i++));
      enc2 = this._keyStr.indexOf(input.charAt(i++));
      enc3 = this._keyStr.indexOf(input.charAt(i++));
      enc4 = this._keyStr.indexOf(input.charAt(i++));

      chr1 = (enc1 << 2) | (enc2 >> 4);
      chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
      chr3 = ((enc3 & 3) << 6) | enc4;

      output = output + String.fromCharCode(chr1);

      if (enc3 != 64) {
        output = output + String.fromCharCode(chr2);
      }
      if (enc4 != 64) {
        output = output + String.fromCharCode(chr3);
      }

    }

    output = Base64._utf8_decode(output);

    return output;

  },

  // private method for UTF-8 encoding
  _utf8_encode: function (string) {
    string = string.replace(/\r\n/g, "\n");
    var utftext = "";

    for (var n = 0; n < string.length; n++) {

      var c = string.charCodeAt(n);

      if (c < 128) {
        utftext += String.fromCharCode(c);
      } else if ((c > 127) && (c < 2048)) {
        utftext += String.fromCharCode((c >> 6) | 192);
        utftext += String.fromCharCode((c & 63) | 128);
      } else {
        utftext += String.fromCharCode((c >> 12) | 224);
        utftext += String.fromCharCode(((c >> 6) & 63) | 128);
        utftext += String.fromCharCode((c & 63) | 128);
      }

    }

    return utftext;
  },

  // private method for UTF-8 decoding
  _utf8_decode: function (utftext) {
    var string = "";
    var i = 0;
    var c = c1 = c2 = 0;

    while (i < utftext.length) {

      c = utftext.charCodeAt(i);

      if (c < 128) {
        string += String.fromCharCode(c);
        i++;
      } else if ((c > 191) && (c < 224)) {
        c2 = utftext.charCodeAt(i + 1);
        string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
        i += 2;
      } else {
        c2 = utftext.charCodeAt(i + 1);
        c3 = utftext.charCodeAt(i + 2);
        string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
        i += 3;
      }

    }

    return string;
  }
}

module.exports = Base64;

• crypto.js

npm install --save crypto-js
import CryptoJS from 'crypto-js';

直接引入

/*!
 * Crypto-JS v1.1.0
 * http://code.google.com/p/crypto-js/
 * Copyright (c) 2009, Jeff Mott. All rights reserved.
 * http://code.google.com/p/crypto-js/wiki/License
 */

const Crypto = {};

(function () {

  var base64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";


  // Crypto utilities
  var util = Crypto.util = {

    // Bit-wise rotate left
    rotl: function (n, b) {
      return (n << b) | (n >>> (32 - b));
    },

    // Bit-wise rotate right
    rotr: function (n, b) {
      return (n << (32 - b)) | (n >>> b);
    },

    // Swap big-endian to little-endian and vice versa
    endian: function (n) {

      // If number given, swap endian
      if (n.constructor == Number) {
        return util.rotl(n, 8) & 0x00FF00FF |
          util.rotl(n, 24) & 0xFF00FF00;
      }

      // Else, assume array and swap all items
      for (var i = 0; i < n.length; i++)
        n[i] = util.endian(n[i]);
      return n;

    },

    // Generate an array of any length of random bytes
    randomBytes: function (n) {
      for (var bytes = []; n > 0; n--)
        bytes.push(Math.floor(Math.random() * 256));
      return bytes;
    },

    // Convert a string to a byte array
    stringToBytes: function (str) {
      var bytes = [];
      for (var i = 0; i < str.length; i++)
        bytes.push(str.charCodeAt(i));
      return bytes;
    },

    // Convert a byte array to a string
    bytesToString: function (bytes) {
      var str = [];
      for (var i = 0; i < bytes.length; i++)
        str.push(String.fromCharCode(bytes[i]));
      return str.join("");
    },

    // Convert a string to big-endian 32-bit words
    stringToWords: function (str) {
      var words = [];
      for (var c = 0, b = 0; c < str.length; c++, b += 8)
        words[b >>> 5] |= str.charCodeAt(c) << (24 - b % 32);
      return words;
    },

    // Convert a byte array to big-endian 32-bits words
    bytesToWords: function (bytes) {
      var words = [];
      for (var i = 0, b = 0; i < bytes.length; i++, b += 8)
        words[b >>> 5] |= bytes[i] << (24 - b % 32);
      return words;
    },

    // Convert big-endian 32-bit words to a byte array
    wordsToBytes: function (words) {
      var bytes = [];
      for (var b = 0; b < words.length * 32; b += 8)
        bytes.push((words[b >>> 5] >>> (24 - b % 32)) & 0xFF);
      return bytes;
    },

    // Convert a byte array to a hex string
    bytesToHex: function (bytes) {
      var hex = [];
      for (var i = 0; i < bytes.length; i++) {
        hex.push((bytes[i] >>> 4).toString(16));
        hex.push((bytes[i] & 0xF).toString(16));
      }
      return hex.join("");
    },

    // Convert a hex string to a byte array
    hexToBytes: function (hex) {
      var bytes = [];
      for (var c = 0; c < hex.length; c += 2)
        bytes.push(parseInt(hex.substr(c, 2), 16));
      return bytes;
    },

    // Convert a byte array to a base-64 string
    bytesToBase64: function (bytes) {

      // Use browser-native function if it exists
      if (typeof btoa == "function") return btoa(util.bytesToString(bytes));

      var base64 = [],
        overflow;

      for (var i = 0; i < bytes.length; i++) {
        switch (i % 3) {
          case 0:
            base64.push(base64map.charAt(bytes[i] >>> 2));
            overflow = (bytes[i] & 0x3) << 4;
            break;
          case 1:
            base64.push(base64map.charAt(overflow | (bytes[i] >>> 4)));
            overflow = (bytes[i] & 0xF) << 2;
            break;
          case 2:
            base64.push(base64map.charAt(overflow | (bytes[i] >>> 6)));
            base64.push(base64map.charAt(bytes[i] & 0x3F));
            overflow = -1;
        }
      }

      // Encode overflow bits, if there are any
      if (overflow != undefined && overflow != -1)
        base64.push(base64map.charAt(overflow));

      // Add padding
      while (base64.length % 4 != 0) base64.push("=");

      return base64.join("");

    },

    // Convert a base-64 string to a byte array
    base64ToBytes: function (base64) {

      // Use browser-native function if it exists
      if (typeof atob == "function") return util.stringToBytes(atob(base64));

      // Remove non-base-64 characters
      base64 = base64.replace(/[^A-Z0-9+\/]/ig, "");

      var bytes = [];

      for (var i = 0; i < base64.length; i++) {
        switch (i % 4) {
          case 1:
            bytes.push((base64map.indexOf(base64.charAt(i - 1)) << 2) |
              (base64map.indexOf(base64.charAt(i)) >>> 4));
            break;
          case 2:
            bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & 0xF) << 4) |
              (base64map.indexOf(base64.charAt(i)) >>> 2));
            break;
          case 3:
            bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & 0x3) << 6) |
              (base64map.indexOf(base64.charAt(i))));
            break;
        }
      }

      return bytes;

    }

  };

  // Crypto mode namespace
  Crypto.mode = {};

})();

module.exports = Crypto;

• hmac.js

/*!
 * Crypto-JS v1.1.0
 * http://code.google.com/p/crypto-js/
 * Copyright (c) 2009, Jeff Mott. All rights reserved.
 * http://code.google.com/p/crypto-js/wiki/License
 */

const Crypto = require('./crypto.js');

(function () {

  // Shortcut
  var util = Crypto.util;

  Crypto.HMAC = function (hasher, message, key, options) {

    // Allow arbitrary length keys
    key = key.length > hasher._blocksize * 4 ?
      hasher(key, {
        asBytes: true
      }) :
      util.stringToBytes(key);

    // XOR keys with pad constants
    var okey = key,
      ikey = key.slice(0);
    for (var i = 0; i < hasher._blocksize * 4; i++) {
      okey[i] ^= 0x5C;
      ikey[i] ^= 0x36;
    }

    var hmacbytes = hasher(util.bytesToString(okey) +
      hasher(util.bytesToString(ikey) + message, {
        asString: true
      }), {
        asBytes: true
      });
    return options && options.asBytes ? hmacbytes :
      options && options.asString ? util.bytesToString(hmacbytes) :
      util.bytesToHex(hmacbytes);

  };

})();

module.exports = Crypto;

• sha1.js

/*!
 * Crypto-JS v1.1.0
 * http://code.google.com/p/crypto-js/
 * Copyright (c) 2009, Jeff Mott. All rights reserved.
 * http://code.google.com/p/crypto-js/wiki/License
 */

const Crypto = require('./crypto.js');

(function () {

  // Shortcut
  var util = Crypto.util;

  // Public API
  var SHA1 = Crypto.SHA1 = function (message, options) {
    var digestbytes = util.wordsToBytes(SHA1._sha1(message));
    return options && options.asBytes ? digestbytes :
      options && options.asString ? util.bytesToString(digestbytes) :
      util.bytesToHex(digestbytes);
  };

  // The core
  SHA1._sha1 = function (message) {

    var m = util.stringToWords(message),
      l = message.length * 8,
      w = [],
      H0 = 1732584193,
      H1 = -271733879,
      H2 = -1732584194,
      H3 = 271733878,
      H4 = -1009589776;

    // Padding
    m[l >> 5] |= 0x80 << (24 - l % 32);
    m[((l + 64 >>> 9) << 4) + 15] = l;

    for (var i = 0; i < m.length; i += 16) {

      var a = H0,
        b = H1,
        c = H2,
        d = H3,
        e = H4;

      for (var j = 0; j < 80; j++) {

        if (j < 16) w[j] = m[i + j];
        else {
          var n = w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16];
          w[j] = (n << 1) | (n >>> 31);
        }

        var t = ((H0 << 5) | (H0 >>> 27)) + H4 + (w[j] >>> 0) + (
          j < 20 ? (H1 & H2 | ~H1 & H3) + 1518500249 :
          j < 40 ? (H1 ^ H2 ^ H3) + 1859775393 :
          j < 60 ? (H1 & H2 | H1 & H3 | H2 & H3) - 1894007588 :
          (H1 ^ H2 ^ H3) - 899497514);

        H4 = H3;
        H3 = H2;
        H2 = (H1 << 30) | (H1 >>> 2);
        H1 = H0;
        H0 = t;

      }

      H0 += a;
      H1 += b;
      H2 += c;
      H3 += d;
      H4 += e;

    }

    return [H0, H1, H2, H3, H4];

  };

  // Package private blocksize
  SHA1._blocksize = 16;

})();

module.exports = Crypto;