微信小程序上传图片 STS方式（临时访问）

先在根目录创建utils目录 
|-----utils
    |-----Crypto.js 加密文件
    |-----oss.js 封装

使用页面

const app = getApp();
const oss = require('../../utils/oss.js')

import wxRequest from '../../utils/wx_request.js'

Page({

  /**
   * 页面的初始数据
   */
  data: {
      
  },


  /**
   * 更换头像
   */
  upHead() {
    var that = this;

    wx.chooseImage({
      count: 1, //最多可以选择的图片总数  
      sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有  
      sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有  
      success: function(res) {
        // 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片  
        let tempFilePaths = res.tempFilePaths;
        console.log("res", res)
        console.log("tempFilePaths", tempFilePaths)

        that.queryOssData().then(res => {
          console.log(res.data)
          if (res.success) {
            that.upLoadFileService(tempFilePaths, res.data)
          }
        })
      }
    });
  },

  upLoadFileService(file, ossData) {
    const that = this;
    const date = new Date()
    let year = date.getFullYear();
    let month = date.getMonth() + 1;
    let day = date.getDate();
    let obj = oss.util.aliOssParams(ossData.tempAk, ossData.tempSk, app.globalData.OssBaseUrl);
    let alikey = `head/user_head_${year}-${month}-${day}_${date.getTime()}_${Math.c}.png`
    wx.uploadFile({
      url: app.globalData.OssBaseUrl,
      filePath: file[0],
      name: 'file',
      formData: {
        key: alikey,
        name: file[0],
        policy: obj.policy,
        OSSAccessKeyId: ossData.tempAk,
        success_action_status: '200',
        signature: obj.signature,
        'x-oss-security-token': ossData.token
      },
      success: function(res) {
        console.log(res)
      },
      fail: function(res) {
        console.log(res)
        wx.hideToast();
        wx.showModal({
          title: '错误提示',
          content: '上传图片失败',
          showCancel: false,
          success: function(res) {}
        })
      }
    });
  },

  /**
   * 获取oss参数
   */
  queryOssData() {
    return new Promise((resolve, reject) => {
      wxRequest.postWxRequest({
        url: '', // 后台获取阿里云参数地址
        success: (res) => {
          resolve(res)
        }
      })
    })
  }
})

oss.js

import { Crypto, Base64} from "./crypto.js"
const util = {
  aliOssParams(aid, aky, host) {
    var aid = aid;//你自己的阿里云的accessid
    var aky = aky;//你自己的阿里云的accesskey
    var host = host;//你自己的阿里云域名
    var policyText = {
      "expiration": "2022-01-01T12:00:00.000Z",//上传的文件失效日期自己定义
      "conditions": [
        ["content-length-range", 0, 10485760000]//上传的内容大小，自己定义
      ]
    };
    var policy = Base64.encode(JSON.stringify(policyText));//生成的加密策略
    var bytes = Crypto.util.HMAC(Crypto.util.SHA1, policy, aky, { asBytes: true });
    var signature = Crypto.util.bytesToBase64(bytes);//生成的签名
    return {
      policy: policy,
      signature: signature,
      aid: aid,
      host: host
    }
  }
 
}
 
export { util }  

Crypto.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
 */
 
var base64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 
// Global Crypto object
const Crypto = {};
 
// Crypto utilities
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;
 
  },
  HMAC: function (hasher, message, key, options) {
 
    // Allow arbitrary length keys
    key = key.length > 16 * 4 ?
      hasher(key, { asBytes: true }) :
      Crypto.util.stringToBytes(key);
 
    // XOR keys with pad constants
    var okey = key,
      ikey = key.slice(0);
    for (var i = 0; i < 16 * 4; i++) {
      okey[i] ^= 0x5C;
      ikey[i] ^= 0x36;
    }
 
    var hmacbytes = hasher(Crypto.util.bytesToString(okey) +
      hasher(Crypto.util.bytesToString(ikey) + message, { asString: true }),
      { asBytes: true });
    return options && options.asBytes ? hmacbytes :
      options && options.asString ? Crypto.util.bytesToString(hmacbytes) :
        Crypto.util.bytesToHex(hmacbytes);
 
  },
  sha11: function (k) {
    var u = Crypto.util.stringToWords(k),
      v = k.length * 8,
      o = [],
      q = 1732584193,
      p = -271733879,
      h = -1732584194,
      g = 271733878,
      f = -1009589776;
    u[v >> 5] |= 128 << (24 - v % 32);
    u[((v + 64 >>> 9) << 4) + 15] = v;
    for (var y = 0; y < u.length; y += 16) {
      var D = q,
        C = p,
        B = h,
        A = g,
        z = f;
      for (var x = 0; x < 80; x++) {
        if (x < 16) {
          o[x] = u[y + x]
        } else {
          var s = o[x - 3] ^ o[x - 8] ^ o[x - 14] ^ o[x - 16];
          o[x] = (s << 1) | (s >>> 31)
        }
        var r = ((q << 5) | (q >>> 27)) + f + (o[x] >>> 0) + (x < 20 ? (p & h | ~p & g) + 1518500249 : x < 40 ? (p ^ h ^ g) + 1859775393 : x < 60 ? (p & h | p & g | h & g) - 1894007588 : (p ^ h ^ g) - 899497514);
        f = g;
        g = h;
        h = (p << 30) | (p >>> 2);
        p = q;
        q = r
      }
      q += D;
      p += C;
      h += B;
      g += A;
      f += z
    }
    return [q, p, h, g, f]
  },
  SHA1: function (e, c) {
    var d = Crypto.util.wordsToBytes(Crypto.util.sha11(e));
    return c && c.asBytes ? d : c && c.asString ? Crypto.util.bytesToString(d) : Crypto.util.bytesToHex(d)
  }
 
};
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;
  }
 
}
// Crypto mode namespace
Crypto.mode = {};
module.exports = {
  Crypto: Crypto,
  Base64: Base64
}