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WebSocket Logger

Log all the communication of every WebSocket

当前为 2018-03-06 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name        WebSocket Logger
  3. // @namespace   esterTion
  4. // @description Log all the communication of every WebSocket
  5. // @include     *://*/*
  6. // @version     2
  7. // @grant       none
  8. // @run-at      document-start
  9. // ==/UserScript==
  10.  
  11. var scriptString = (function () {
  12.   if (window.Proxy == undefined) return;
  13.   var oldWS = window.WebSocket;
  14.   var loggerIncrement = 1;
  15.   function processDataForOutput(data) {
  16.     if (typeof data == 'string') return data;
  17.     else if (data.byteLength != undefined) {
  18.       var val = { orig: data, uintarr: new Uint8Array(data) };
  19.       var arr = [], i = 0;
  20.       for (; i < data.byteLength; i++) {
  21.         arr.push(val.uintarr[i]);
  22.       }
  23.       var hexarr = arr.map(function (i) { var s = i.toString(16); while (s.length < 2) s = '0' + s; return s; });
  24.       val.hexstr = hexarr.join('');
  25.       val.string = unescape(hexarr.map(function (i) { return '%' + i; }).join(''));
  26.       val.b64str = btoa(val.string);
  27.       try {
  28.         val.string = decodeURIComponent(escape(val.string));
  29.       } catch (e) { }
  30.       return val;
  31.     }
  32.   }
  33.   var proxyDesc = {
  34.     set: function (target, prop, val) {
  35.       if (prop == 'onmessage') {
  36.         var oldMessage = val;
  37.         val = function (e) {
  38.           console.log(`#${target.WSLoggerId} Msg from server << `, processDataForOutput(e.data));
  39.           oldMessage(e);
  40.         };
  41.       }
  42.       return target[prop] = val;
  43.     },
  44.     get: function (target, prop) {
  45.       var val = target[prop];
  46.       if (prop == 'send') val = function (data) {
  47.         console.log(`#${target.WSLoggerId} Msg from client >> `, processDataForOutput(data));
  48.         target.send(data);
  49.       };
  50.       else if (typeof val == 'function') val = val.bind(target);
  51.       return val;
  52.     }
  53.   };
  54.   WebSocket = new Proxy(oldWS, {
  55.     construct: function (target, args, newTarget) {
  56.       var obj = new target(args[0]);
  57.       obj.WSLoggerId = loggerIncrement++;
  58.       console.log(`WebSocket #${obj.WSLoggerId} created, connecting to`, args[0]);
  59.       return new Proxy(obj, proxyDesc);
  60.     }
  61.   });
  62. });
  63.  
  64. var observer = new MutationObserver(function () {
  65.   if (document.head) {
  66.     observer.disconnect();
  67.     var script = document.createElement('script');
  68.     script.innerHTML = '(' + scriptString + ')();';
  69.     document.head.appendChild(script);
  70.     script.remove();
  71.   }
  72. });
  73. observer.observe(document, { subtree: true, childList: true });