是否有可能捕获并记录我自己的Websocket(wss)流量

问题描述

如何使用PhantomJs捕获并记录来自Websocket并发往浏览器的数据流量?

How I can use PhantomJs to capture and log my own data traffic coming from a websocket and destined to my browser ?

推荐答案

您可以尝试使用以下针对PhantomJS 2.1.1的工作示例的方法.它在 http://www.websocket.org/echo.html 上打开示例页面并打印数据流量(输入和输出)，以及一些额外的调试信息.交通本身不是很有趣，但适合演示目的.希望这会有所帮助.

You can try an approach with the following working example for PhantomJS 2.1.1.It opens sample page at http://www.websocket.org/echo.html and prints data traffic (input and output), along with some extra debug information. The traffic itself is not very interesting, but fits for the demonstration purpose.Hope, this helps.

var webPage = require('webpage');
var page = webPage.create();

page.onConsoleMessage = function(msg) {
    console.log('\n' + msg);
};

page.onError = function() {};

page.onInitialized = function() {
    page.evaluate(function proxyWebSocket() {

        var WS = window.WebSocket;

        var WebSocket = function(url, protocols) {
            var self = this;
            console.log('Creating websocket: ' + url);

            var ws = new WS(url, protocols);

            self.addEventListener = function(type, listener, useCapture, wantsUntrusted) {
                console.log('addEventListener: ' + type + '; ' + listener + '; ' + useCapture + '; ' + wantsUntrusted);

                var newListener = function(event) {
                    console.log('dispatching event: ', JSON.stringify(event));
                    return listener(event);
                };
                return ws.addEventListener.call(ws, type, newListener, useCapture, wantsUntrusted);
            };

            self.dispatchEvent = ws.dispatchEvent.bind(ws);
            self.removeEventListener = ws.removeEventListener.bind(ws);

            self.send = function(data) {
                console.log('websocket send: ' + data);
                return ws.send(data);
            };

            self.close = function(code, reason) {
                self.trace && console.log('websocket close: ' + code + ' ' + reason);
                return ws.close(code, reason);
            };

            // https://developer.mozilla.org/en-US/docs/Web/API/WebSocket#Attributes
            var properties = [
                { name: "binaryType" },
                { name: "bufferedAmount", readOnly: true },
                { name: "extensions" },
                { name: "onclose", traceData: true },
                { name: "onmessage", traceData: true },
                { name: "onopen", traceData: true },
                { name: "onerror", traceData: true },
                { name: "protocol" },
                { name: "readyState", readOnly: true },
                { name: "url", readOnly: true }
            ];
            properties.forEach(defineProperty, self);

            function defineProperty(prop) {
                var descriptor = {
                    get: function() {
                        var result = ws[prop.name];
                        console.log('websocket get ' + prop.name + ': ' + result);
                        return result;
                    }
                };

                if (!prop.readOnly) {
                    descriptor.set = function(value) {
                        console.log('websocket set ' + prop.name + ': ' + value);
                        if (prop.traceData) {
                            var traceFn = function(event) {
                                console.log('websocket ' + prop.name + (event.data ? ': ' + JSON.stringify(event.data) : ''));
                                return value(event);
                            };
                            ws[prop.name] = traceFn;
                        } else {
                            ws[prop.name] = value;
                        }
                        return value;
                    };
                }

                Object.defineProperty(self, prop.name, descriptor);
            }
        };

        WebSocket.CONNECTING = WS.CONNECTING;
        WebSocket.OPEN = WS.OPEN;
        WebSocket.CLOSING = WS.CLOSING;
        WebSocket.CLOSED = WS.CLOSED;

        window.WebSocket = WebSocket;
    });
};

page.open("http://www.websocket.org/echo.html", function testWebSocket(status) {
    if (status === "success") {
        console.log('open status: ' + status);

        window.setTimeout(function() {
            phantom.exit();
        }, 5000);
    }
});

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