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index.js
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index.js
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// file 'index.js' (backend implementation Tasmota Timer)
// full code at https://github.com/tonyjurg/TasmotaTimer
// version 0.2 (27 June 2024)
const http = require('http');
const fs = require('fs');
const path = require('path');
const bcrypt = require('bcrypt');
const url = require('url');
const hostname = '0.0.0.0';
const port = 3000;
let debug = false;
let logFilePath = path.join(__dirname, 'server.log');
let users = [];
let accounts = [];
/**
* Hash a password using bcrypt.
* @param {string} password - The password to hash.
* @returns {Promise<string>} The hashed password.
*/
async function hashPassword(password) {
const saltRounds = 10;
return await bcrypt.hash(password, saltRounds);
}
/**
* Authenticate a user with a username and password.
* @param {string} username - The username of the user.
* @param {string} password - The password of the user.
* @returns {Promise<boolean>} True if authentication is successful, otherwise false.
*/
async function authenticate(username, password) {
const user = users.find(u => u.username === username);
if (user && typeof password === 'string' && typeof user.password === 'string') {
return await bcrypt.compare(password, user.password);
}
return false;
}
/**
* Sanitize input to prevent XSS attacks.
* @param {string} input - The input to sanitize.
* @returns {string} The sanitized input.
*/
function sanitizeInput(input) {
const regex = /[<>"'/]/g;
if (regex.test(input)) {
logMessage(' !! [sanitizeInput] Input had to be sanitized: ' + input.replace(regex, (char) => `&#${char.charCodeAt(0)};`));
}
return input.replace(regex, (char) => `&#${char.charCodeAt(0)};`);
}
/**
* Check if the request is authorized.
* @param {string} authHeader - The authorization header from the request.
* @returns {boolean} True if the request is authorized, otherwise false.
*/
function isAuthorized(authHeader) {
const credentials = Buffer.from(authHeader.split(' ')[1], 'base64').toString('ascii').split(':');
const [username, password] = credentials;
return authenticate(username, password);
}
/**
* Serve a static file.
* @param {string} fileName - The name of the file to serve.
* @param {string} contentType - The MIME type of the file.
* @param {object} res - The HTTP response object.
*/
function serveStaticFile(fileName, contentType, res) {
const filePath = path.join(__dirname, 'public', fileName);
fs.readFile(filePath, (err, content) => {
if (err) {
res.writeHead(500);
res.end('Error loading the page');
logMessage(' !! [serveStaticFile] Error serving static file ' + fileName);
return;
}
res.writeHead(200, { 'Content-Type': contentType });
res.end(content);
});
}
/**
* Log messages to a file if debugging is enabled.
* @param {string} message - The message to log.
* Note regarding the symbols used in the log messages:
* !! The logmessage relates to a handled error condition
* == The logmessage relates to a succesfull backend action
* <= The logmessage relates to the backend interacting with the user client (app)
* => The logmessage relates to the backend interacting with a Tasmota device
*/
function logMessage(message) {
if (debug) {
const logEntry = `${new Date().toISOString()} ${message}\n`;
fs.appendFile(logFilePath, logEntry, (err) => {
if (err) {
console.error('Error writing to log file:', err);
}
});
}
}
/**
* Handle setting power state for the Tasmota device.
* @param {string} state - The power state to set (ON/OFF).
* @param {object} account - The account information for the device.
* @param {object} res - The HTTP response object.
* @param {string} clientIp - The client's IP address.
*/
function handleSetPower(state, account, res, clientIp) {
logMessage(' == [SetPower] Client at ' + clientIp + ' called SetPower setting state to ' + state + ' for device: ' + account.deviceName + ' at ' + account.deviceIP);
const command = 'Power ' + state;
const options = getRequestOptions(command, account);
makeRequest(options, res, null);
}
/**
* Get the current time from the Tasmota device.
* @param {object} account - The account information for the device.
* @param {Date} clientTime - The client's current time.
* @param {function} callback - The callback function to execute with the time data.
*/
function getCurrentDeviceTime(account, clientTime, callback) {
const timeOptions = getRequestOptions('Time', account);
const timeReq = http.request(timeOptions, (timeRes) => {
let timeData = '';
timeRes.on('data', (chunk) => timeData += chunk);
timeRes.on('end', () => {
try {
const timeResponse = JSON.parse(timeData);
const deviceTimeStr = timeResponse.Time;
const deviceTime = new Date(deviceTimeStr);
if (isNaN(deviceTime.getTime())) {
callback(new Error('Invalid device time format'), null);
return;
}
const clientHours = clientTime.getUTCHours();
const clientMinutes = clientTime.getUTCMinutes();
const deviceHours = deviceTime.getUTCHours();
const deviceMinutes = deviceTime.getUTCMinutes();
const timeDeltaMinutes = ((clientHours * 60) + clientMinutes) - ((deviceHours * 60) + deviceMinutes);
callback(null, {
deviceTime,
timeDeltaMinutes
});
} catch (error) {
callback(error, null);
}
});
});
timeReq.on('error', (error) => {
callback(error, null);
});
timeReq.end();
}
/**
* Handle setting a timer for the Tasmota device.
* @param {string} hours - The hours to set on the timer.
* @param {string} minutes - The minutes to set on the timer.
* @param {string} clientTimeStr - The client's current time as a string.
* @param {object} account - The account information for the device.
* @param {object} res - The HTTP response object.
* @param {string} clientIp - The client's IP address.
*/
function handleSetTimer(hours, minutes, clientTimeStr, account, res, clientIp) {
logMessage(' == [SetTimer] Client at ' + clientIp + ' called SetTimer with delta ' + hours + ':' + minutes + ' for device: ' + account.deviceName + ' at ' + account.deviceIP);
const clientTime = new Date(clientTimeStr);
if (isNaN(clientTime.getTime())) {
logMessage(' !! [SetTimer] Invalid client time format');
res.writeHead(400, { 'Content-Type': 'text/plain' });
res.end('Invalid client time format');
return;
}
getCurrentDeviceTime(account, clientTime, (error, timeData) => {
if (error) {
logMessage(' !! [SetTimer] Error getting device time: ' + error.message);
res.writeHead(500, { 'Content-Type': 'text/plain' });
res.end(`Server error: ${error.message}`);
return;
}
const { deviceTime, timeDeltaMinutes } = timeData;
logMessage(' == [SetTimer] Current time for device: ' + account.deviceName + ' at ' + account.deviceIP + ' is ' + deviceTime);
logMessage(' == [SetTimer] Current time for client at ' + clientIp + ' is ' + clientTime);
logMessage(' == [SetTimer] Time delta in minutes: ' + timeDeltaMinutes);
let adjustedDeviceTime = new Date(deviceTime.getTime());
adjustedDeviceTime.setHours(adjustedDeviceTime.getHours() + parseInt(hours));
adjustedDeviceTime.setMinutes(adjustedDeviceTime.getMinutes() + parseInt(minutes));
logMessage(' == [SetTimer] Timer set on the Tasmota device: ' + adjustedDeviceTime);
const sequence = Array(7).fill(0);
sequence[adjustedDeviceTime.getDay()] = 1;
const dayArray = sequence.join('');
const command = `Timer1 {"Enable":1,"Mode":0,"Time":"${adjustedDeviceTime.getHours().toString().padStart(2, '0')}:${adjustedDeviceTime.getMinutes().toString().padStart(2,'0')}:00","Window":0,"Days":"${dayArray}","Repeat":0,"Output":1,"Action":0}`;
const options = getRequestOptions(command, account);
logMessage(' == [SetTimer] Timer setting to be sent: ' + adjustedDeviceTime.getHours().toString().padStart(2, '0') + ':' + adjustedDeviceTime.getMinutes().toString().padStart(2, '0') + ' on day: ' + dayArray);
makeRequest(options, res, () => {
res.writeHead(200, { 'Content-Type': 'application/json' });
res.end(JSON.stringify({ success: true }));
});
});
}
/**
* Handle getting the timer status for a device.
* @param {string} clientTimeStr - The client's current time as a string.
* @param {object} account - The account information for the device.
* @param {object} res - The HTTP response object.
* @param {string} clientIp - The client's IP address.
*/
function handleGetTimerStatus(clientTimeStr, account, res, clientIp) {
logMessage(' == [GetTimerStatus] Client at ' + clientIp + ' called GetTimerStatus for device: ' + account.deviceName + ' at ' + account.deviceIP);
const clientTime = new Date(clientTimeStr);
if (isNaN(clientTime.getTime())) {
logMessage(' !! [GetTimerStatus] Invalid time format received from client at ' + clientIp);
res.writeHead(400, { 'Content-Type': 'text/plain' });
res.end('Invalid client time format');
return;
}
getCurrentDeviceTime(account, clientTime, (error, timeData) => {
if (error) {
logMessage(' !! [GetTimerStatus] Error getting device time: ' + error.message);
res.writeHead(500, { 'Content-Type': 'text/plain' });
res.end(`Server error: ${error.message}`);
return;
}
const { deviceTime, timeDeltaMinutes } = timeData;
logMessage(' == [GetTimerStatus] Current time for device: ' + account.deviceName + ' at ' + account.deviceIP + ' is ' + deviceTime);
logMessage(' == [GetTimerStatus] Current time for client at ' + clientIp + ' is ' + clientTime);
logMessage(' == [GetTimerStatus] Time delta in minutes: ' + timeDeltaMinutes);
const command = 'Timer1';
const options = getRequestOptions(command, account);
makeRequest(options, res, (timerData) => {
if (timerData.Timer1 && timerData.Timer1.Enable) {
const [hours, minutes] = timerData.Timer1.Time.split(':').map(Number);
const dowMap = timerData.Timer1.Days;
const timerEnd = new Date(clientTime);
timerEnd.setHours(hours);
timerEnd.setMinutes(minutes + timeDeltaMinutes);
timerEnd.setSeconds(0);
timerEnd.setMilliseconds(0);
// Calculate the next occurrence based on dowMap
let nextDay = timerEnd.getDay();
while (dowMap[nextDay] !== '1') {
nextDay = (nextDay + 1) % 7;
timerEnd.setDate(timerEnd.getDate() + 1);
}
const remainingTimeMs = timerEnd - clientTime;
const remainingHours = Math.floor(remainingTimeMs / (1000 * 60 * 60));
const remainingMinutes = Math.floor((remainingTimeMs % (1000 * 60 * 60)) / (1000 * 60));
const daysOfWeek = ["Sun.", "Mon.", "Tues.", "Wed.", "Thur.", "Fri.", "Sat."];
const dayOfWeek = daysOfWeek[timerEnd.getDay()];
// Correct the hours if they are 24 or more
const displayHours = timerEnd.getHours();
const formattedHours = displayHours === 24 ? '00' : displayHours.toString().padStart(2, '0');
const humanReadableTime = `${dayOfWeek}, ${formattedHours}:${timerEnd.getMinutes().toString().padStart(2, '0')} (${remainingHours} hours and ${remainingMinutes} minutes left)`;
res.writeHead(200, { 'Content-Type': 'application/json' });
res.end(JSON.stringify({ humanReadableTime }));
} else {
res.writeHead(200, { 'Content-Type': 'application/json' });
res.end(JSON.stringify({ humanReadableTime: 'Timer not set or expired' }));
}
});
});
}
/**
* Handle clearing the timer for a device.
* @param {object} account - The account information for the device.
* @param {object} res - The HTTP response object.
* @param {string} clientIp - The client's IP address.
*/
function handleClearTimer(account, res, clientIp) {
logMessage(' == [ClearTimer] Client at ' + clientIp + ' called ClearTimer for device: ' + account.deviceName + ' at ' + account.deviceIP);
const command = 'Timer1 {"Enable":0,"Mode":0,"Time":"00:00","Window":0,"Days":"0000000","Repeat":0,"Output":1,"Action":0}';
const options = getRequestOptions(command, account);
makeRequest(options, res, null);
}
/**
* Handle getting the current time from a device.
* @param {object} account - The account information for the device.
* @param {object} res - The HTTP response object.
* @param {string} clientIp - The client's IP address.
*/
function handleGetTime(account, res, clientIp) {
logMessage(' == [GetTime] Client at ' + clientIp + ' called GetTime for device: ' + account.deviceName + ' at ' + account.deviceIP);
const command = 'Time';
const options = getRequestOptions(command, account);
makeRequest(options, res, null);
}
/**
* Handle getting the power status for a device.
* @param {object} account - The account information for the device.
* @param {object} res - The HTTP response object.
* @param {string} clientIp - The client's IP address.
*/
function handleGetPowerStatus(account, res, clientIp) {
logMessage(' == [GetPowerStatus] Client at ' + clientIp + ' called GetPowerStatus for device: ' + account.deviceName + ' at ' + account.deviceIP);
const command = 'Power';
const options = getRequestOptions(command, account);
makeRequest(options, res, null);
}
/**
* Handle enabling timers for a device.
* @param {object} account - The account information for the device.
* @param {object} res - The HTTP response object.
* @param {string} clientIp - The client's IP address.
*/
function handleEnableTimers(account, res, clientIp) {
logMessage(' == [EnableTimers] Client at ' + clientIp + ' called EnableTimers for device: ' + account.deviceName + ' at ' + account.deviceIP);
const command = 'Timers 1';
const options = getRequestOptions(command, account);
makeRequest(options, res, null);
}
/**
* Handle disabling timers for a device.
* @param {object} account - The account information for the device.
* @param {object} res - The HTTP response object.
* @param {string} clientIp - The client's IP address.
*/
function handleDisableTimers(account, res, clientIp) {
logMessage(' == Client at ' + clientIp + ' called DisableTimers for device: ' + account.deviceName + ' at ' + account.deviceIP);
const command = 'Timers 0';
const options = getRequestOptions(command, account);
makeRequest(options, res, null);
}
/**
* Get request options for the Tasmota device.
* @param {string} command - The command to send to the device.
* @param {object} account - The account information for the device.
* @returns {object} The request options.
*/
function getRequestOptions(command, account) {
return {
hostname: account.deviceIP,
port: 80,
path: `/cm?cmnd=${encodeURIComponent(command)}`,
method: 'GET',
headers: {
'Authorization': 'Basic ' + Buffer.from(`${account.username}:${account.password}`).toString('base64')
}
};
}
/**
* Make a request to the Tasmota device.
* @param {object} options - The request options.
* @param {object} res - The HTTP response object.
* @param {function} callback - The callback function to execute with the response data.
*/
function makeRequest(options, res, callback) {
logMessage(' => [makeRequest] Sending HTTP request with options: ' + JSON.stringify(options));
const req = http.request(options, (response) => {
let data = '';
response.on('data', (chunk) => data += chunk);
response.on('end', () => {
if (callback) {
callback(JSON.parse(data), res);
} else {
res.writeHead(200, { 'Content-Type': 'application/json' });
res.end(data);
}
});
});
req.on('error', (error) => {
logMessage(' !! [makeRequest] Request Error: ' + error);
res.writeHead(500, { 'Content-Type': 'text/plain' });
res.end(`Server error: ${error.message}`);
});
req.end();
}
// **********************************************
// * MAIN PART *
// **********************************************
// Read and parse configuration file for the node.js server
fs.readFile('config.json', 'utf8', (err, data) => {
if (err) {
console.error('Error reading config file:', err);
return;
}
try {
const config = JSON.parse(data);
debug = config.debug || false;
logFilePath = config.logFilePath ? path.resolve(config.logFilePath) : logFilePath;
users = config.users.map(user => ({
username: user.username,
password: hashPassword(user.password)
}));
} catch (parseErr) {
console.error('Error parsing config file:', parseErr);
}
});
// Read and parse Tasmota devices settings file
fs.readFile('settings.json', 'utf8', (err, data) => {
if (err) {
console.error('Error reading settings file:', err);
return;
}
try {
accounts = JSON.parse(data);
} catch (parseErr) {
console.error('Error parsing settings file:', parseErr);
}
});
// Create HTTP server
const server = http.createServer((req, res) => {
const parsedUrl = new URL(req.url, `http://${req.headers.host}`);
const pathname = parsedUrl.pathname;
const clientIp = req.headers['x-forwarded-for'] || req.connection.remoteAddress;
// Handle login request
if (pathname === '/login' && req.method === 'POST') {
let body = '';
req.on('data', chunk => body += chunk);
req.on('end', () => {
const { username, password } = JSON.parse(body);
if (authenticate(username, password)) {
res.writeHead(200, { 'Content-Type': 'application/json' });
res.end(JSON.stringify({ success: true }));
} else {
res.writeHead(401, { 'Content-Type': 'application/json' });
res.end(JSON.stringify({ success: false }));
}
});
return;
}
// Check for authorization
const authHeader = req.headers.authorization;
if (!authHeader || !isAuthorized(authHeader)) {
res.writeHead(401, { 'Content-Type': 'text/plain', 'WWW-Authenticate': 'Basic' });
res.end('Unauthorized');
return;
}
// Serve static files
if (pathname === '/' || pathname === '/index.html') {
serveStaticFile('index.html', 'text/html', res);
logMessage(' == [HTTP server] Serving file index.html to client at ' + clientIp);
return;
}
if (pathname === '/styles.css') {
serveStaticFile('styles.css', 'text/css', res);
logMessage(' == [HTTP server] Serving file styles.css to client at ' + clientIp);
return;
}
if (pathname === '/favicon.ico') {
serveStaticFile('favicon.ico', 'image/x-icon', res);
logMessage(' == [HTTP server] Serving file favicon.ico to client at ' + clientIp);
return;
}
if (pathname === '/header.png') {
serveStaticFile('header.png', 'image/png', res);
logMessage(' == [HTTP server] Serving file header.png to client at ' + clientIp);
return;
}
// Serve list of devices
if (pathname === '/devices') {
logMessage(' == [HTTP server] Serving list of devices to client at ' + clientIp);
res.writeHead(200, { 'Content-Type': 'application/json' });
res.end(JSON.stringify(accounts.map(acc => ({ deviceName: acc.deviceName }))));
return;
}
// Handle device-specific requests
const deviceName = parsedUrl.searchParams.get('device');
const account = accounts.find(acc => acc.deviceName === deviceName);
if (!deviceName || !account) {
res.writeHead(400, { 'Content-Type': 'text/plain' });
res.end('Invalid device name');
logMessage(' !! [HTTP server] Invalid device name "' + deviceName + '" received from client at ' + clientIp);
return;
}
logMessage(' <= [HTTP server] Received request: ' + pathname + ' from: ' + clientIp + ' with parameters: ' + parsedUrl.searchParams);
// Route requests to appropriate handler
switch (pathname) {
case '/setPower':
handleSetPower(sanitizeInput(parsedUrl.searchParams.get('state')), account, res, clientIp);
break;
case '/getTime':
handleGetTime(account, res, clientIp);
break;
case '/setTimer':
handleSetTimer(parsedUrl.searchParams.get('hours'), parsedUrl.searchParams.get('minutes'), parsedUrl.searchParams.get('clienttime'), account, res, clientIp);
break;
case '/clearTimer':
handleClearTimer(account, res, clientIp);
break;
case '/getTimerStatus':
handleGetTimerStatus(parsedUrl.searchParams.get('clienttime'), account, res, clientIp);
break;
case '/getPowerStatus':
handleGetPowerStatus(account, res, clientIp);
break;
case '/enableTimers':
handleEnableTimers(account, res, clientIp);
break;
case '/disableTimers':
handleDisableTimers(account, res, clientIp);
break;
default:
logMessage(' !! [HTTP server] Route ' + pathname + ' not found');
res.writeHead(404, { 'Content-Type': 'text/plain' });
res.end('Not Found');
}
});
// Start the server
server.listen(port, hostname, () => {
console.log(`Server running at http://${hostname}:${port}/`);
});