Crude express proxy that spies on traffic

Snooping Proxy

var express = require("express");
var httpProxy = require("http-proxy");
var stream = require("stream");

var api = "http://localhost:4201";

var apiProxy = httpProxy.createProxyServer({
    target: api
});
var app = express();

/**
 * Make body readable
 */
app.use(function (req, res, next) {
    if (req.method != "POST" && req.method != "PUT" && req.method != "PATCH") {
        next();
        return;
    }

    var buffer = '';

    req.on('data', function (data) {
        buffer += data;
    });

    req.on('end', function () {
        req.body = buffer;

        var bufferStream = new stream.PassThrough();
        bufferStream.end(new Buffer(buffer));
        req.bodyStream = bufferStream;

        next();
    });
});

/**
 * Log
 */
app.use(function (req, res, next) {
    // todo, some kind of decision on whether to log. todo Whether that is here, or via checking some kind of header
    console.log(req.originalUrl);
    if (req.body != null) {
        console.log(req.body);
    }

    next();
});

/**
 * Proxy request (given we're already reading the body)
 */
app.all("/*", function (req, res) {
    apiProxy.web(req, res, { buffer: req.bodyStream });
});

app.listen(4202, function () {
    console.log("Snooping Proxy listening on port 4202!");
});