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XML Http Request Interceptor

XHR网络请求拦截器

此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.cn-greasyfork.org/scripts/473361/1237032/XML%20Http%20Request%20Interceptor.js 

  1. // ==UserScript==
  2. // @name        XML Http Request Interceptor
  3. // @namespace   xml-http-request-interceptor
  4. // @version     1.0.0
  5. // @description XHR网络请求拦截器
  6. // @author      如梦Nya
  7. // @license     MIT
  8. // @match       *://*/*
  9. // ==/UserScript==
  10.  
  11. class XHRIntercept {
  12.     /** @type {XHRIntercept} */
  13.     static _self
  14.  
  15.     /**
  16.      * 初始化
  17.      * @returns {XHRIntercept}
  18.      */
  19.     constructor() {
  20.         if (XHRIntercept._self) return XHRIntercept._self
  21.         XHRIntercept._self = this
  22.  
  23.         // 修改EventListener方法
  24.         let rawXhrAddEventListener = XMLHttpRequest.prototype.addEventListener
  25.         XMLHttpRequest.prototype.addEventListener = function (key, func) {
  26.             if (key === "progress") {
  27.                 this.onprogress = func
  28.             } else {
  29.                 rawXhrAddEventListener.apply(this, arguments)
  30.             }
  31.         }
  32.         let rawXhrRemoveEventListener = XMLHttpRequest.prototype.removeEventListener
  33.         XMLHttpRequest.prototype.removeEventListener = function (key, func) {
  34.             if (key === "progress") {
  35.                 this.onprogress = undefined
  36.             } else {
  37.                 rawXhrRemoveEventListener.apply(this, arguments)
  38.             }
  39.         }
  40.  
  41.         // 修改send方法
  42.         /** @type {function[]} */
  43.         this.sendIntercepts = []
  44.         this.rawXhrSend = XMLHttpRequest.prototype.send
  45.         XMLHttpRequest.prototype.send = function () { XHRIntercept._self._xhrSend(this, arguments) }
  46.     }
  47.  
  48.     /**
  49.      * 添加Send拦截器
  50.      * @param {function} func 
  51.      */
  52.     onSend(func) {
  53.         if (this.sendIntercepts.indexOf(func) >= 0) return
  54.         this.sendIntercepts.push(func)
  55.     }
  56.  
  57.     /**
  58.      * 删除Send拦截器
  59.      * @param {function | undefined} func 
  60.      */
  61.     offSend(func) {
  62.         if (typeof func === "function") {
  63.             let index = this.sendIntercepts.indexOf(func)
  64.             if (index < 0) return
  65.             this.sendIntercepts.splice(index, 1)
  66.         } else {
  67.             this.sendIntercepts = []
  68.         }
  69.     }
  70.  
  71.  
  72.     /**
  73.      * 发送拦截器
  74.      * @param {XMLHttpRequest} self 
  75.      * @param {IArguments} args
  76.      */
  77.     _xhrSend(self, args) {
  78.         let complete = () => { this.rawXhrSend.apply(self, args) }
  79.         for (let i = 0; i < this.sendIntercepts.length; i++) {
  80.             let flag = this.sendIntercepts[i](self, args, complete)
  81.             if (flag) return
  82.         }
  83.         complete()
  84.     }
  85. }