Implementation of WeChat applet simulation cookie

This article mainly introduces the implementation of WeChat applet simulation cookie. The content is quite good. Now I share it with you and give it as a reference.

Development background

The existing system already has a complete set of interfaces, and user status and verification are all based on cookies.

Some businesses require a mini program version. As we all know, WeChat mini programs do not support cookies. For the business to be launched online, the best way is to do it based on the existing set of interfaces. It will not change much and is also the fastest.

Simulate cookie

View the request through the browser's development tool and Network bar. The cookie in the browser will be carried in each request. In the Request Headers of http, Cookie is used as the key name.

Then, in WeChat’s official request method wx.request, we set the header and add a cookie, which should be able to be simulated.

The question comes again, how to get the cookie returned by the server.

Through the login interface (when logging in, the server will implant a cookie as a session), check the http return header.

wx.request({ url: '/api/login', success: (data) => { if(data.statusCode === 200) { console.log(data); // data 中应该会有 Set-Cookie 或 set-cookie 的字样，嗯，那就是服务器种下的 cookie } } })

Get the cookie and store it locally, and insert it directly the next time you request data, perfect.

Format cookie

I originally thought that cookies only need to be entered and exited to be perfectly simulated, but in actual operation I discovered that carrying The cookie sent to the server cannot be recognized.

The cookie returned by the server will carry many fields for storage, such as path=/;

// 服务器放回的 cookie let cookie = 'userKey=1234567890; Path=/; Expires=Thu, 21 Jun 2018 13:15:08 GMT; HttpOnly,userId=111; Path=/; Expires=Thu, 21 Jun 2018 13:15:08 GMT,nickName=; Path=/; Expires=Thu, 21 Jun 2018 13:15:08 GMT,userName=111111; Path=/; Expires=Thu, 21 Jun 2018 13:15:08 GMT,imgUrl=; Path=/; Expires=Thu, 21 Jun 2018 13:15:08 GMT'; // 模拟的是需要的格式样式 let virtualCookie = 'userKey=1234567890; userName=111111; userId=111;';

Oh my god~What should I do? Filter it.

Written a simple and rough filtering solution.

// cookie 的本地存储位置 const COOKIE_KEY = '__cookie_key__'; /** * 格式化用户需要的 cookie */ const normalizeUserCookie = (cookies = '') => { let __cookies = []; (cookies.match(/([\w\-.]*)=([^\s=]+);/g) || []).forEach((str) => { if (str !== 'Path=/;' && str.indexOf('csrfToken=') !== 0) { __cookies.push(str); } }); wx.setStorageSync(COOKIE_KEY, __cookies.join(' ')); };

csrfTokenis used next withEgg.js,Path=/;In some applications, it will bepath=/;

normalizeUserCookieMainly filters data likexx=xxx; Then exclude meaningless data likepath=/;.

When logging in to the interface, save the cookie and bring it with the next request. Then, it should, yes, maybe, can be simulated.

Cooperate with Egg.js

Egg’s built-inegg-securityplug-in defaults to all non-security 』methods, such as POST, PUT, and DELETE, all perform CSRF verification.
Egg.js Although CSRF can be turned off in the configuration, what if it must be used?

First of all, we need to understand one thing, howcsrfTokencame about.

After many verifications, we learned that when the http request is made, the csrfToken value is not carried at the agreed location. This request will carry a new csrfToken in the returned cookie; when this request has carried the csrfToken value, value, it will not be generated as csrfToken. When the csrfToken in the agreed location is consistent with the csrfToken in the cookie, the verification is passed.

Continue with the aboveFormat the cookieoperation required by the user, first put aside the csrfToken and handle the user status alone.

After each request, try to get the csrfToken that may exist in the cookie separately. If there is a value, cache it. If there is no value, skip and use the old value.

Encapsulate an Ajax

This applet is based on wepy, so the optimizedwepy is used. request;

A version based on Egg.js.

It may be slightly different from the actual development, please modify it appropriately.

import wepy from 'wepy'; export const HTTP_HOST = 'http://127.0.0.1:3000'; export const HTTP_HOST_API = `${HTTP_HOST}/api/wxmp`; // cookie 的本地存储位置 const COOKIE_KEY = '__cookie_key__'; // csrfToken 的本地存储位置 const CSRF_TOKEN_KEY = '__csrf_token__'; /** * 清除用户Cookie */ export const cleanUserCookie = () => { wx.setStorageSync(COOKIE_KEY, ''); } /** * 格式化用户需要的 cookie * @param {String} cookies */ export const normalizeUserCookie = (cookies = '') => { let __cookies = []; (cookies.match(/([\w\-.]*)=([^\s=]+);/g) || []).forEach((str) => { if (str !== 'path=/;' && str.indexOf('csrfToken=') !== 0) { __cookies.push(str); } }); wx.setStorageSync(COOKIE_KEY, __cookies); }; /** * 格式化 token */ const normalizeCsrfToken = () => { let __value = wx.getStorageSync(CSRF_TOKEN_KEY) || ''; let __inputs = __value.match(/csrfToken=[\S]*/) || []; let __key = __inputs[0]; // csrfToken=1212132323; if (!!!__key) { return ''; } // 脱水 return __key.replace(/;$/, '').replace(/^csrfToken=/, ''); }; /** * 保存 csrf 的cookie * 不一定每次请求都会更新 cookie * @param {String} cookie */ const seveCsrfTokenCookie = (cookie) => { if (cookie) { wx.setStorageSync(CSRF_TOKEN_KEY, cookie); } }; /** * 请求数据 * @param {Object} opt */ export const doAjax = (opt) => { return new Promise((resolve, reject) => { let Cookies = wx.getStorageSync(COOKIE_KEY) || []; let csrf = normalizeCsrfToken(); let url = opt.url; // 整理 Cookie Cookies.push(`csrfToken=${csrf};`); // 设置请求头部 opt.header = Object.assign( { 'x-csrf-token': csrf, Cookie: Cookies.join(' ') }, opt.header || {} ); opt.success = (data) => { seveCsrfTokenCookie(data.header['set-cookie']); // 统一操作 if (data.statusCode == 200) { if (url === '/login') { normalizeUserCookie(data.header['set-cookie']); } resolve(data.data); } else { reject('未知错误，请重试一次'); } }; opt.fail = (err) => { reject(err); }; opt.url = `${HTTP_HOST_API}${opt.url}`; wepy.request(opt); }); };

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