关于微信小步伐端base64解码问题

由于atob是浏览器端的，对于微信小步伐不支持，导致模仿器【开辟工具】表现正常，但真机异常解析失败问题，微信小步伐原有的api，官方文档中也废弃了

办理方案：
调用：

1. const decodedString = base64_url_decode(res.data);
2. const jsonData = JSON.parse(decodedString);

复制代码

weAtob  解密处理文件包 ：

1. "use strict";
2. Object.defineProperty(exports, "__esModule", { value: true });
3. var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
4. var b64re = /^(?:[A-Za-z\d+\/]{4})*?(?:[A-Za-z\d+\/]{2}(?:==)?|[A-Za-z\d+\/]{3}=?)?$/;
5. exports.weBtoa = function (string) {
6.   string = String(string);
7.   var bitmap, a, b, c, result = "", i = 0, rest = string.length % 3;
8.   for (; i < string.length;) {
9.     if ((a = string.charCodeAt(i++)) > 255 ||
10.       (b = string.charCodeAt(i++)) > 255 ||
11.       (c = string.charCodeAt(i++)) > 255)
12.       throw new TypeError("Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the Latin1 range.");
13.     bitmap = (a << 16) | (b << 8) | c;
14.     result += b64.charAt(bitmap >> 18 & 63) + b64.charAt(bitmap >> 12 & 63) +
15.       b64.charAt(bitmap >> 6 & 63) + b64.charAt(bitmap & 63);
16.   }
17.   return rest ? result.slice(0, rest - 3) + "===".substring(rest) : result;
18. };
19. exports.weAtob = function (string) {
20.   string = String(string).replace(/[\t\n\f\r ]+/g, "");
21.   if (!b64re.test(string))
22.     throw new TypeError("Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded.");
23.   string += "==".slice(2 - (string.length & 3));
24.   var bitmap, result = "", r1, r2, i = 0;
25.   for (; i < string.length;) {
26.     bitmap = b64.indexOf(string.charAt(i++)) << 18 | b64.indexOf(string.charAt(i++)) << 12 |
27.       (r1 = b64.indexOf(string.charAt(i++))) << 6 | (r2 = b64.indexOf(string.charAt(i++)));
28.     result += r1 === 64 ? String.fromCharCode(bitmap >> 16 & 255) :
29.       r2 === 64 ? String.fromCharCode(bitmap >> 16 & 255, bitmap >> 8 & 255) :
30.         String.fromCharCode(bitmap >> 16 & 255, bitmap >> 8 & 255, bitmap & 255);
31.   }
32.   return result;
33. };
34. function b64DecodeUnicode(str) {
35.   return decodeURIComponent(exports.weAtob(str).replace(/(.)/g, function (p) {
36.     var code = p.charCodeAt(0).toString(16).toUpperCase();
37.     if (code.length < 2) {
38.       code = "0" + code;
39.     }
40.     return "%" + code;
41.   }));
42. }
43. exports.base64_url_decode = function (str) {
44.   var output = str.replace(/-/g, "+").replace(/_/g, "/");
45.   switch (output.length % 4) {
46.     case 0:
47.       break;
48.     case 2:
49.       output += "==";
50.       break;
51.     case 3:
52.       output += "=";
53.       break;
54.     default:
55.       throw "Illegal base64url string!";
56.   }
57.   try {
58.     return b64DecodeUnicode(output);
59.   }
60.   catch (err) {
61.     return exports.weAtob(output);
62.   }
63. }
64. function weappJwtDecode(token, options) {
65.   if (typeof token !== "string") {
66.     throw ("Invalid token specified");
67.   }
68.   options = options || {};
69.   var pos = options.header === true ? 0 : 1;
70.   try {
71.     return JSON.parse(base64_url_decode(token.split(".")[pos]));
72.   }
73.   catch (e) {
74.     throw ("Invalid token specified: " + e.message);
75.   }
76. }
77. exports.default = weappJwtDecode;

复制代码

免责声明：如果侵犯了您的权益，请联系站长，我们会及时删除侵权内容，谢谢合作！更多信息从访问主页：qidao123.com:ToB企服之家，中国第一个企服评测及商务社交产业平台。