ex.js

#!/usr/bin/nodejs

/*
 *	This script purpose - be mock ESP8266 chip
 *	there emulate answers of chip on request`s from browser
 *  query`s list:
 * 		1) /src?resource_name=resource.file
 *		2) /current
 * 		3) /lastValues?sensor=sensor_name(tIn tOut baro humid)
 * 		4) /availablePeriod
 *              and e.t.
 *
 *   month names "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
 */


console.log("Start node app on port 3000 !!!");

var fs = require('fs');
var http = require('http');
var url = require('url');
var path = require('path');
var root = './espSensors/data';


http.createServer(function (req, res) {
    console.log('url: ' + req.url);
    var all = url.parse(req.url, true);
    var query = all.query;
    var pathName = all.pathname;
    var extension = path.extname(all.pathname);
    if (pathName == '/')pathName = '/index.htm';
    switch (pathName) {
        case '/current':
            sendCurrent(res);
            break;
        case '/lastValues':
            sendLast(query, res);
            break;
        case '/src':
            parseSrc(query, res);
            break;
        case '/favicon.ico':
            sendFile('image/png', '/src/pic/okay.png', res);
        case '/index.htm':
            sendFile('text/html', '/index.htm', res);
            break;
        case '/help':
            sendFile('text/html', '/Help.htm', res);
            break;

        case '/availablePeriod':
            sendPeriods(res);
            break;
        case '/sensorData':
            sendSensorData(query, res);
            break;
        default:
            console.log('resource "' + pathName + '" Not Found');
            notFound(res);
    }

}).listen(3000);

function parseSrc(query, res) {
    var contentType = 'text/plain';
    var fName = '/src';
    if (query['js']) {
        contentType = (query['js'].indexOf(".json") > 0) ? 'application/json' : 'application/javascript';
        fName += '/js/' + query['js'];
    }
    else if (query['css']) {
        contentType = 'text/css';
        fName += '/css/' + query['css'];
    }
    else if (query['pic']) {
	var ends = query['pic'].substring(query['pic'].indexOf('.'),query['pic'].length);
console.log('ends = ' + ends);
        contentType = (ends == '.png')? 'image/png':'image/svg+xml';
console.log('contentType = ' + contentType);
        fName += '/pic/' + query['pic'];
    } else {
        console.log('not found for query: ' + JSON.stringify(query));
        notFound(res);
        return;
    }
    sendFile(contentType, fName, res);
}

function sendCurrent(res) {
    res.writeHead(200, {'Content-Type': 'application/json'});
    res.end('{"tIn": 20, "tOut": -10, "baro": 756, "humid":40}');
}

function sendLast(query, resp) {
    var lIn = '{ "tIn":[ 0,0,0,22,22,22,22,22,22,23,24,23,22], "last":3 }';
    var lOut = '{"tOut":[0,0,0,-2,-2,-3,-3,-4,-5,-5,-3,-1, -1], "last":3 }';
    var lBaro = '{"baro":[0,0,0,0,650,745,746,744,740,740,744,746,747], "last":12 }';
    var lHumid = '{"humid":[-1,20,20,20,21,20,20,20,21,22,22,23,22], "last":12}';
    var res = query['sensor'];
    if (res == 'tIn')res = lIn;
    else if (res == 'tOut')res = lOut;
    else if (res == 'baro')res = lBaro;
    else if (res == 'humid')res = lHumid;
    else res = '{"ERROR":["not have sensor for:' + JSON.stringify(query) + '",""],"last":0}';
    resp.writeHead(200, {'Content-Type': 'application/json'});
    resp.end(res);
}

function sendFile(contentType, fName, res) {
    fName = root + fName;
    console.log('try send file: ' + fName);
    if(contentType.search('gif') > 0 || contentType.search('png') > 0){
		var img = fs.readFileSync(fName);
		res.writeHead(200, {'Content-Type': contentType});
		res.end(img, 'binary');
	}else{
		fs.readFile(fName, 'utf8', function (err, data) {
			if (err) {
				console.log('ERROR on load file: ' + fName + " error=" + err);
				res.writeHead(500, {'Content-Type': 'text/plain'});
				res.end('can`t read file: ' + fName);
			} else {
				res.writeHead(200, {'Content-Type': contentType});
				res.end(data);
			}
		});
	}
}

function sendPeriods(res) {
    var periods = '["/data/2018/Jan.txt", "/data/2018/Feb.txt"  , "/data/2018/Mar.txt" ' +
        ', "/data/2018/Jun.txt",  "/data/2018/Jul.txt", ' +
        ' "/data/2019/Oct.txt", "/data/2019/Nov.txt" , "/data/2020/Jan.txt" , "/data/2020/Feb.txt"]';
    var curt = '[ "/data/2018/Feb.txt" ]';
    var toSend = periods;
    res.writeHead(200, {'Content-Type': 'application/json'});
    console.log("I send to client periods  " + toSend);
    res.end(toSend);
}

function sendSensorData(query, res) {
    //  period format: yyyy/month.txt
    console.log("request \"sensorData\" query: " + query['period']);
    var answer = '';
    var period = query['period'];
    if (period.length < 1)answer = 'Can`t get query from request \"sensorData\"';
    else answer = getPeriodData(period);
    console.log("SEND answer :\n" + answer);
    res.writeHead(200, {'Content-Type': 'text/plain'});
    res.end(answer);
}


function notFound(res) {
    res.writeHead(404, {'Content-Type': 'text/html'});
    res.end('<html><body><h1 align="center">Resource not found</h1></body></html>');
}

function getPeriodData(period) {
    //day hour tIn tOut pressure humidites
    var periods = {
        '2018/Jan.txt': ' 01 01 2 -2 777 10\n' +
            ' 01 02 2 -2 773 10\n' +
            ' 01 03 2 -2 774 10\n' +
            ' 01 04 2 -2 776 10\n' +
            ' 01 05 2 -2 775 10\n' +
            ' 01 06 2 -2 772 10\n' +
            ' 01 07 2 -2 777 10\n' +
            ' 02 01 2 -2 777 10\n' +
            ' 02 02 2 -2 727 10\n' +
            ' 02 03 2 -2 737 10\n' +
            ' 02 04 2 -2 747 10\n' +
            ' 02 05 2 -2 757 10\n' +
            ' 02 06 2 -2 767 10\n' +
            ' 02 07 2 -2 727 10\n' +
            ' 03 01 22 -2 777 10\n' +
            ' 03 02 23 -2 777 10\n' +
            ' 03 03 24 -2 777 10\n' +
            ' 03 04 25 -2 777 10\n' +
            ' 03 05 26 -2 777 10\n' +
            ' 03 06 27 -2 777 10\n' +
            ' 03 07 28 -2 777 10\n' +
            ' 04 01 2 -2 777 12\n' +
            ' 04 02 2 -2 777 14\n' +
            ' 04 03 2 -2 777 14\n' +
            ' 04 04 4 -2 777 14\n' +
            ' 04 05 2 -2 777 16\n' +
            ' 04 06 8 -2 777 16\n' +
            ' 04 07 3 -2 777 17\n' +
            ' 05 01 5 -2 777 12\n' +
            ' 06 02 3 -2 777 14\n' +
            ' 07 03 6 -2 777 14\n' +
            ' 08 04 8 -2 777 14\n' +
            ' 09 05 8 -2 777 16\n' +
            ' 10 06 7 -2 777 16\n' +
            ' 11 06 27 -2 777 10\n' +
            ' 12 07 28 -2 777 10\n' +
            ' 13 01 2 -2 777 12\n' +
            ' 14 02 2 -2 777 14\n' +
            ' 15 03 2 -2 777 14\n' +
            ' 16 04 4 -2 777 14\n' +
            ' 17 05 2 -2 777 16\n' +
            ' 18 06 8 -2 777 16\n' +
            ' 19 07 3 -2 777 17\n' +
            ' 20 01 5 -2 777 12\n' +
            ' 21 02 3 -2 777 14\n' +
            ' 22 03 6 -2 777 14\n' +
            ' 23 04 8 -2 777 14\n' +
            ' 24 05 8 -2 777 16\n' +
            ' 24 06 7 -2 777 16\n' +
            ' 25 07 3 -2 777 17\n' +
            ' 26 02 3 -2 777 14\n' +
            ' 27 03 6 -2 777 14\n' +
            ' 28 04 8 -2 777 14\n' +
            ' 29 05 8 -2 777 16\n' +
            ' 30 06 7 -2 777 16\n' +
            ' 31 07 3 -2 777 17\n',
        '2018/Feb.txt': ' 02 01 2 -2 777 10\n' +
            ' 02 02 2 -2 727 10\n' +
            ' 02 03 2 -2 737 10\n' +
            ' 02 04 2 -2 747 10\n' +
            ' 02 05 2 -2 757 10\n' +
            ' 02 06 2 -2 767 10\n' +
            ' 02 07 2 -2 727 10\n' +
            ' 02 08 2 -21 777 10\n' +
            ' 02 09 2 -21 777 10\n' +
            ' 02 10 2 -22 777 10\n' +
            ' 02 11 2 -23 777 10\n' +
            ' 02 12 2 -24 777 10\n' +
            ' 02 13 2 -25 777 10\n' +
            ' 02 14 2 -26 777 10\n' +
            ' 02 15 2 -2 777 10\n' +
            ' 02 16 2 -2 727 10\n' +
            ' 02 17 2 -2 737 10\n' +
            ' 02 18 2 -2 747 10\n' +
            ' 02 19 2 -2 757 10\n' +
            ' 02 20 2 -2 767 10\n' +
            ' 02 21 2 -2 727 10\n' +
            ' 02 22 2 -21 777 10\n' +
            ' 02 23 2 -21 777 10\n' +
            ' 02 24 2 -22 777 10\n' +
            ' 02 25 2 -23 777 10\n' +
            ' 02 26 2 -24 777 10\n' +
            ' 02 27 2 -25 777 10\n' +
            ' 02 28 2 -26 777 10\n',
        '2018/Mar.txt': ' 02 01 2 -21 777 10\n' +
            ' 02 02 2 -21 777 10\n' +
            ' 02 03 4 -22 777 10\n' +
            ' 02 04 2 -23 777 10\n' +
            ' 03 05 3 -24 777 10\n' +
            ' 03 06 4 -25 777 10\n' +
            ' 03 07 2 -26 777 10\n' +
            ' 04 01 2 -21 777 10\n' +
            ' 04 02 3 -21 777 10\n' +
            ' 04 03 4 -22 777 10\n' +
            ' 04 04 2 -23 777 10\n' +
            ' 05 05 2 -24 777 10\n' +
            ' 05 06 3 -25 777 10\n' +
            ' 07 07 2 -26 777 10\n',
        '2018/Jun.txt': ' 03 01 22 15 777 10\n' +
            ' 03 02 23 23 777 10\n' +
            ' 03 03 24 24 777 10\n' +
            ' 03 04 25 27 777 10\n' +
            ' 03 05 26 29 777 10\n' +
            ' 03 06 27 22 777 10\n' +
            ' 03 07 28 15 777 10\n',
        '2018/Jul.txt': ' 04 01 2 -2 777 12\n' +
            ' 04 02 2 12 777 14\n' +
            ' 04 03 2 23 777 14\n' +
            ' 04 04 2 12 777 14\n' +
            ' 04 05 2 22 777 16\n' +
            ' 04 06 2 32 777 16\n' +
            ' 04 07 2 33 777 17\n',
        '2019/Oct.txt': ' 05 11 2 -2 777 10\n' +
            ' 05 12 2 -2 777 10\n' +
            ' 05 13 2 -2 777 10\n' +
            ' 05 14 2 -2 777 10\n' +
            ' 05 15 2 -2 777 10\n' +
            ' 05 16 2 -2 777 10\n' +
            ' 05 17 2 -2 777 10\n',
        '2019/Nov.txt': ' 16 01 2 -2 777 10\n' +
            ' 16 02 2 -2 777 10\n' +
            ' 16 03 2 -2 777 10\n' +
            ' 16 04 2 -2 777 10\n' +
            ' 16 05 2 -2 777 10\n' +
            ' 16 06 2 -2 777 10\n' +
            ' 16 07 2 -2 777 10\n' +
            ' 17 01 2 -42318392034 776 11',
        '2020/Jan.txt': '⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮\n' +
            '01 01 -364758439 -32 738 34\n' +
            '⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮⸮\n' +
            '01 02 3 32 738 38\n' +
            '01 03 -364758439 -12 718 40\n' +
            '01 04 36 32 728 45\n' +
            '01 05 46 39 748 65\n' +
            '02 04 36 32 728 45\n' +
            '02 05 46 39 748 65\n',
        '2020/Feb.txt' : ' '
    }
    if (periods.hasOwnProperty(period))return periods[period];
    console.log("Bad request for \"sensorData\"");
    return 'ERROR: bad request \"' + period + '\"';
}