Plugin for hoxy proxy that dumps responses to disk

dump.js

/**
 * Plugin for hoxy proxy that dumps responses to disk
 * https://github.com/greim/hoxy
 *
 * Saves to disk (almost) everything that goes to your browser (images, videos, etc.)
 * Simply add to rules.txt:
 * response:@dump()
 */
var fs = require('fs');

var color = {
    'reset': '\033[0m',
    'bold': '\033[1m',
    'italic': '\033[3m',
    'underline': '\033[4m',
    'blink': '\033[5m',
    'black': '\033[30m',
    'red': '\033[31m',
    'green': '\033[32m',
    'yellow': '\033[33m',
    'blue': '\033[34m',
    'magenta': '\033[35m',
    'cyan': '\033[36m',
    'white': '\033[37m'
};

function codeColor(code) {
    var code_colors = {
        '100' : color.blue,
        '200' : color.green,
        '300' : color.blue,
        '400' : color.red,
        '500' : color.red
    };

    code = Math.floor(code / 100) * 100;
    return code_colors[code];
}

exports.run = function(api) {
    var reqInf = api.getRequestInfo();
    var respInf = api.getResponseInfo();
    var request_body = api.getRequestBody();
    var response_body = '';
    var url;
    var dumpfile;

    if (respInf) {
        url = reqInf.host + reqInf.url;

        console.log(color.yellow + reqInf.method + " " + url + color.reset);
        console.log(reqInf.headers);
        if (request_body) {
            console.log(request_body);
        }
        console.log('...........................................................');
        console.log('> ' + codeColor(respInf.statusCode) + respInf.statusCode + color.reset);
        console.log(respInf.headers);

        if (respInf.statusCode >= 200 && respInf.statusCode <= 299 ) {

            dumpfile = 'dump/' + url.replace(/[^a-zA-Z0-9]/g,'_');
            if (dumpfile.length > 50) {
                dumpfile = dumpfile.substr(0,50);
            }
            switch (respInf.headers['content-type']) {
                case 'image/jpg':
                case 'image/jpeg':
                    dumpfile += ".jpg";
                    break;
                case 'image/gif':
                    dumpfile += ".gif";
                    break;
                case 'image/png':
                    dumpfile += ".png";
                    break;
                case 'application/javascript':
                    dumpfile += ".js";
                    break;
                case 'text/css':
                    dumpfile += ".css";
                    break;
                default:
                    dumpfile += ".txt";
            }
            for (var i=0,l=respInf.body.length; i<l; i++) {
                response_body += respInf.body[i].toString('binary');
            }
            fs.writeFile(dumpfile, response_body, 'binary', function (err) {
                if (err) throw err;
            });
        }
        console.log('==========================================================');
    }
    api.notify();
};