From 63bf73d2c440978dea7924d8d1220929ca465c36 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9A=D0=BE=D0=BC=D0=B0=D1=80=D0=BE=D0=B2=20=D0=94=D0=B0?=
 =?UTF-8?q?=D0=BD=D0=B8=D0=BB=20=D0=90=D0=BD=D0=B0=D1=82=D0=BE=D0=BB=D1=8C?=
 =?UTF-8?q?=D0=B5=D0=B2=D0=B8=D1=87=206?= <komarovda6@it.mos.ru>
Date: Fri, 29 May 2026 05:23:22 +0300
Subject: [PATCH] =?UTF-8?q?=D0=9F=D0=BE=D0=BB=D0=BD=D1=8B=D0=B9=20=D1=80?=
 =?UTF-8?q?=D0=B5=D1=84=D0=B0=D0=BA=D1=82=D0=BE=D1=80=D0=B8=D0=BD=D0=B3=20?=
 =?UTF-8?q?=D1=81=D0=B5=D1=80=D0=B2=D0=B5=D1=80=D0=B0=20=D0=B8=20=D0=BA?=
 =?UTF-8?q?=D0=BB=D0=B8=D0=B5=D0=BD=D1=82=D0=B0,=20=D0=B3=D0=BE=D0=BB?=
 =?UTF-8?q?=D0=BE=D1=81=D0=BE=D0=B2=D1=8B=D0=B5=20=D1=81=D0=BE=D0=BE=D0=B1?=
 =?UTF-8?q?=D1=89=D0=B5=D0=BD=D0=B8=D1=8F,=20=D0=B0=D1=83=D0=B4=D0=B8?=
 =?UTF-8?q?=D0=BE/=D0=B2=D0=B8=D0=B4=D0=B5=D0=BE,=20Docker?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Сервер:
- Вынесена конфигурация в server/config.js (порт, размер файла из env)
- Вынесена аутентификация в server/auth.js (загрузка users.json, authenticate())
- Вынесено управление соединениями в server/clients.js (createJsonSender, broadcast, validateFile)
- server/server.js стал точкой входа — минимальный код

Клиент:
- Вынесены хуки: hooks/useWebSocket.js (WebSocket + auth), hooks/useChatMessages.js (сообщения + уведомления)
- Вынесены утилиты: utils/blob.js (base64 → Blob URL), utils/linkify.jsx (URL → ссылки), utils/notify.js (звук + favicon)

Новые функции:
- VoiceRecorder — запись голоса через MediaRecorder, отправка как файл
- Аудио/видео плеер в Message (audio/*, video/* с controls)
- URL linkification — http/https ссылки автоматически кликабельны
- Звуковое уведомление (Web Audio API) при сообщении на неактивной вкладке
- Красная точка на favicon при непрочитанных сообщениях

Инфраструктура:
- docker-entrypoint.sh: авто-перезапуск Node.js сервера при падении
- Обновлён README.md: новая структура проекта, список функций, примеры
- Кастомный тонкий скроллбар в Message.css
---
 README.md                               | 130 ++++++++-----------
 client/src/App.jsx                      |  71 +----------
 client/src/components/Chat.jsx          | 124 +-----------------
 client/src/components/Message.css       |  20 +++
 client/src/components/Message.jsx       | 130 ++++++++-----------
 client/src/components/MessageInput.jsx  |  44 ++++---
 client/src/components/VoiceRecorder.css |  60 +++++++++
 client/src/components/VoiceRecorder.jsx | 141 +++++++++++++++++++++
 client/src/hooks/useChatMessages.js     |  68 ++++++++++
 client/src/hooks/useWebSocket.js        |  73 +++++++++++
 client/src/utils/blob.js                |  16 +++
 client/src/utils/linkify.jsx            |  23 ++++
 client/src/utils/notify.js              |  51 ++++++++
 docker-entrypoint.sh                    |  27 ++--
 server/auth.js                          |  21 ++++
 server/clients.js                       |  78 ++++++++++++
 server/config.js                        |   7 ++
 server/server.js                        | 161 ++++++++----------------
 18 files changed, 760 insertions(+), 485 deletions(-)
 create mode 100644 client/src/components/VoiceRecorder.css
 create mode 100644 client/src/components/VoiceRecorder.jsx
 create mode 100644 client/src/hooks/useChatMessages.js
 create mode 100644 client/src/hooks/useWebSocket.js
 create mode 100644 client/src/utils/blob.js
 create mode 100644 client/src/utils/linkify.jsx
 create mode 100644 client/src/utils/notify.js
 create mode 100644 server/auth.js
 create mode 100644 server/clients.js
 create mode 100644 server/config.js

diff --git a/README.md b/README.md
index a2fe4c6..fc8b7a4 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # Чат с общей комнатой
 
-Веб-приложение чата с одной общей комнатой на WebSocket. Поддерживает текстовые сообщения, отправку файлов и отображение изображений.
+Веб-приложение чата с одной общей комнатой на WebSocket.  
+Текстовые сообщения, файлы, изображения, аудио, видео и голосовые сообщения.
 
 **Сервер:** Node.js + `ws`  
 **Клиент:** React + Vite  
@@ -18,7 +19,7 @@ npm install
 npm start
 ```
 
-Запускает WebSocket сервер на `ws://localhost:8080`.
+WebSocket сервер на `ws://localhost:8080`.
 
 ### Клиент
 
@@ -28,8 +29,8 @@ npm install
 npx vite
 ```
 
-Запускает dev-сервер на `http://localhost:3000`.  
-В режиме разработки клиент подключается напрямую к `ws://localhost:8080`.
+Dev-сервер на `http://localhost:3000`.  
+Клиент подключается напрямую к `ws://localhost:8080`.
 
 ### Пользователи по умолчанию
 
@@ -42,15 +43,10 @@ npx vite
 
 ## Production (Docker)
 
-### Сборка образа
+### Сборка и запуск
 
 ```bash
 docker build -t chat-app .
-```
-
-### Запуск контейнера
-
-```bash
 docker run -d -p 80:80 chat-app
 ```
 
@@ -59,11 +55,12 @@ docker run -d -p 80:80 chat-app
 ### Как это работает
 
 - **nginx** на порту 80 раздаёт статику React и проксирует WebSocket
-- Путь `/` → статические файлы клиента (`index.html`, JS, CSS)
-- Путь `/ws` → прокси на Node.js WebSocket сервер (порт 8080 внутри контейнера)
+- Путь `/` → статические файлы клиента
+- Путь `/ws` → прокси на Node.js сервер (порт 8080 внутри контейнера)
 - nginx поддерживает Upgrade до WebSocket, таймаут соединения — 24 часа
 - Максимальный размер загружаемых файлов через nginx — 50 МБ
-- После остановки Node.js контейнер завершается (через `wait`)
+- **Auto-restart:** если Node.js сервер упал, entrypoint перезапускает его через 1 секунду
+- Чистое завершение (exit 0, SIGTERM) — контейнер останавливается без перезапуска
 
 ---
 
@@ -77,8 +74,6 @@ docker run -d -p 80:80 chat-app
 | `MAX_FILE_SIZE` | `10485760` (10 МБ) | Максимальный размер файла в байтах |
 | `USERS_FILE` | `users.json` | Путь к файлу с пользователями |
 
-Пример:
-
 ```bash
 $env:PORT=9090; $env:MAX_FILE_SIZE=2097152; node server.js
 ```
@@ -89,9 +84,7 @@ $env:PORT=9090; $env:MAX_FILE_SIZE=2097152; node server.js
 |-----------|-------------------|--------------------------|---------|
 | `VITE_WS_URL` | `ws://localhost:8080` | `/ws` | URL WebSocket сервера |
 
-Настройки хранятся в файлах:
-- `client/.env.development` — для `npx vite` (dev-режим)
-- `client/.env` — для `vite build` (production-сборка)
+Настройки в `client/.env.development` (dev) и `client/.env` (production).
 
 ---
 
@@ -99,81 +92,54 @@ $env:PORT=9090; $env:MAX_FILE_SIZE=2097152; node server.js
 
 ### Аутентификация
 
-Клиент → Сервер:
-
 ```json
+// → сервер
 { "type": "auth", "login": "alice", "password": "123" }
-```
-
-Сервер → Клиент:
-
-```json
+// ← ответ
 { "type": "auth_result", "success": true }
-```
-
-```json
 { "type": "auth_result", "success": false, "reason": "Invalid login or password" }
 ```
 
 ### Текстовое сообщение
 
-Клиент → Сервер:
-
 ```json
+// → сервер
 { "type": "text", "text": "Привет!" }
-```
-
-Сервер → Все:
-
-```json
+// ← всем
 { "type": "text", "from": "alice", "timestamp": 1717000000000, "text": "Привет!" }
 ```
 
-### Файл / изображение
-
-Клиент → Сервер:
+### Файл / изображение / аудио / видео
 
 ```json
-{
-  "type": "file",
-  "filename": "cat.png",
-  "mime": "image/png",
-  "data": "<base64>"
-}
+// → сервер
+{ "type": "file", "filename": "cat.png", "mime": "image/png", "data": "<base64>" }
+// ← всем (от сервера добавлены from и timestamp)
+{ "type": "file", "from": "alice", "timestamp": 1717000000000, "filename": "cat.png", "mime": "image/png", "data": "<base64>" }
 ```
 
-Сервер → Все (такая же структура, добавлены `from` и `timestamp`):
-
-```json
-{
-  "type": "file",
-  "from": "alice",
-  "timestamp": 1717000000000,
-  "filename": "cat.png",
-  "mime": "image/png",
-  "data": "<base64>"
-}
-```
+Клиент определяет тип файла по MIME: `image/*` — картинка, `audio/*` — плеер, `video/*` — плеер, остальное — скачивание.
 
 ### Системные сообщения
 
-Сервер → Все:
-
 ```json
 { "type": "system", "text": "alice joined the chat" }
+{ "type": "system", "text": "alice left the chat" }
 ```
 
 ---
 
 ## Функциональность
 
-- **Текстовые сообщения** — отображаются с логином отправителя и временем
-- **Файлы** — любые типы, до 10 МБ (настраивается). Файлы передаются через base64 в JSON
-- **Изображения** — автоматически определяются по MIME-типу (`image/*`), рендерятся как `<img>`, клик открывает в новой вкладке
-- **Не-изображения** — отображаются как ссылка для скачивания с именем файла
-- **Уведомления на неактивной вкладке** — звуковой сигнал (Web Audio API) и красная точка на favicon
-- **Системные сообщения** — подключение / отключение участников
-- **Скролл** — автоматический, кастомный тонкий скроллбар в теме приложения
+- **Текстовые сообщения** — логин отправителя, время, ссылки (http/https) автоматически становятся кликабельными
+- **Файлы** — любые типы, до 10 МБ (настраивается), base64 в JSON
+- **Изображения** — `image/*` → `<img>`, клик открывает в новой вкладке
+- **Аудио** — `audio/*` → `<audio controls>` + ссылка скачивания
+- **Видео** — `video/*` → `<video>` с controls + ссылка скачивания
+- **Голосовые сообщения** — кнопка микрофона, запись через `MediaRecorder`, отправка как файл
+- **Уведомления** — звук (Web Audio API) и красная точка на favicon при сообщении на неактивной вкладке
+- **Системные сообщения** — подключение/отключение участников
+- **Автоскролл** — кастомный тонкий скроллбар
 
 ---
 
@@ -182,27 +148,39 @@ $env:PORT=9090; $env:MAX_FILE_SIZE=2097152; node server.js
 ```
 chat/
 ├── server/
-│   ├── server.js          # WebSocket сервер
-│   ├── users.json         # Хардкоженые логины/пароли
+│   ├── config.js           # Настройки из env
+│   ├── auth.js             # Загрузка пользователей, authenticate()
+│   ├── clients.js          # Управление соединениями, broadcast()
+│   ├── server.js           # Точка входа, WebSocketServer
+│   ├── users.json          # Хардкоженые логины/пароли
 │   └── package.json
 ├── client/
 │   ├── src/
-│   │   ├── App.jsx        # Корневой компонент
-│   │   ├── App.css
-│   │   ├── main.jsx       # Точка входа
+│   │   ├── App.jsx / .css
+│   │   ├── main.jsx
+│   │   ├── hooks/
+│   │   │   ├── useWebSocket.js       # WebSocket + auth
+│   │   │   └── useChatMessages.js    # Приём сообщений + уведомления
+│   │   ├── utils/
+│   │   │   ├── blob.js               # base64 → Blob URL
+│   │   │   ├── linkify.jsx           # URL → React-ссылки
+│   │   │   └── notify.js             # Звук + favicon
 │   │   └── components/
 │   │       ├── Login.jsx / .css
 │   │       ├── Chat.jsx / .css
 │   │       ├── MessageList.jsx
 │   │       ├── Message.jsx / .css
-│   │       └── MessageInput.jsx / .css
-│   ├── .env               # Production настройки
-│   ├── .env.development   # Dev настройки
+│   │       ├── MessageInput.jsx / .css
+│   │       └── VoiceRecorder.jsx / .css
+│   ├── .env                 # Production настройки
+│   ├── .env.development     # Dev настройки
 │   ├── index.html
 │   ├── vite.config.js
 │   └── package.json
-├── Dockerfile             # Многостадийная сборка
-├── docker-entrypoint.sh   # Точка входа контейнера
-├── nginx.conf             # Конфигурация nginx
+├── Dockerfile               # Многостадийная сборка
+├── docker-entrypoint.sh     # Auto-restart при падении
+├── nginx.conf
+├── .dockerignore
+├── .gitignore
 └── README.md
 ```
diff --git a/client/src/App.jsx b/client/src/App.jsx
index 1bd3090..0be5fea 100644
--- a/client/src/App.jsx
+++ b/client/src/App.jsx
@@ -1,75 +1,14 @@
-import React, { useState, useRef, useCallback, useEffect } from 'react';
+import React from 'react';
 import Login from './components/Login';
 import Chat from './components/Chat';
-
-const WS_URL = import.meta.env.VITE_WS_URL || 'ws://localhost:8080';
+import useWebSocket from './hooks/useWebSocket';
 
 export default function App() {
-  const [loggedIn, setLoggedIn] = useState(false);
-  const [login, setLogin] = useState('');
-  const [error, setError] = useState('');
-  const wsRef = useRef(null);
-
-  const handleLogin = useCallback((userLogin, password) => {
-    setError('');
-    const ws = new WebSocket(WS_URL);
-
-    ws.onopen = () => {
-      ws.send(JSON.stringify({ type: 'auth', login: userLogin, password }));
-    };
-
-    ws.onmessage = (event) => {
-      let msg;
-      try {
-        msg = JSON.parse(event.data);
-      } catch {
-        return;
-      }
-
-      if (msg.type === 'auth_result') {
-        if (msg.success) {
-          setLogin(userLogin);
-          setLoggedIn(true);
-        } else {
-          setError(msg.reason || 'Authentication failed');
-          ws.close();
-        }
-      }
-    };
-
-    ws.onerror = () => {
-      setError('Cannot connect to server');
-    };
-
-    ws.onclose = () => {
-      if (!loggedIn) {
-        setError('Connection closed');
-      }
-    };
-
-    wsRef.current = ws;
-  }, [loggedIn]);
-
-  const handleLogout = useCallback(() => {
-    if (wsRef.current) {
-      wsRef.current.close();
-      wsRef.current = null;
-    }
-    setLoggedIn(false);
-    setLogin('');
-  }, []);
-
-  useEffect(() => {
-    return () => {
-      if (wsRef.current) {
-        wsRef.current.close();
-      }
-    };
-  }, []);
+  const { login, loggedIn, error, ws, loginToServer, logout } = useWebSocket();
 
   if (!loggedIn) {
-    return <Login onLogin={handleLogin} error={error} />;
+    return <Login onLogin={loginToServer} error={error} />;
   }
 
-  return <Chat ws={wsRef.current} login={login} onLogout={handleLogout} />;
+  return <Chat ws={ws} login={login} onLogout={logout} />;
 }
diff --git a/client/src/components/Chat.jsx b/client/src/components/Chat.jsx
index 3a57b05..3ad90c8 100644
--- a/client/src/components/Chat.jsx
+++ b/client/src/components/Chat.jsx
@@ -1,126 +1,11 @@
-import React, { useState, useEffect, useRef, useCallback } from 'react';
+import React from 'react';
 import MessageList from './MessageList';
 import MessageInput from './MessageInput';
+import useChatMessages from '../hooks/useChatMessages';
 import './Chat.css';
 
-function setFavicon(hasNotification) {
-  const canvas = document.createElement('canvas');
-  canvas.width = 32;
-  canvas.height = 32;
-  const ctx = canvas.getContext('2d');
-
-  ctx.fillStyle = '#4a9eff';
-  ctx.beginPath();
-  ctx.arc(16, 16, 14, 0, 2 * Math.PI);
-  ctx.fill();
-
-  ctx.fillStyle = '#fff';
-  ctx.font = 'bold 18px sans-serif';
-  ctx.textAlign = 'center';
-  ctx.textBaseline = 'middle';
-  ctx.fillText('CH', 16, 16);
-
-  if (hasNotification) {
-    ctx.fillStyle = '#ff4444';
-    ctx.beginPath();
-    ctx.arc(26, 6, 5, 0, 2 * Math.PI);
-    ctx.fill();
-    ctx.strokeStyle = '#1a1a2e';
-    ctx.lineWidth = 2;
-    ctx.stroke();
-  }
-
-  let link = document.querySelector('link[rel="icon"]');
-  if (!link) {
-    link = document.createElement('link');
-    link.rel = 'icon';
-    document.head.appendChild(link);
-  }
-  link.href = canvas.toDataURL();
-}
-
 export default function Chat({ ws, login, onLogout }) {
-  const [messages, setMessages] = useState([]);
-  const [connected, setConnected] = useState(true);
-  const [error, setError] = useState('');
-  const hasNotifRef = useRef(false);
-  const messagesRef = useRef(messages);
-  messagesRef.current = messages;
-
-  const addMessage = useCallback((msg) => {
-    setMessages(prev => [...prev, { ...msg, id: Date.now() + Math.random() }]);
-    if (
-      document.hidden &&
-      msg.from &&
-      msg.from !== login &&
-      (msg.type === 'text' || msg.type === 'file')
-    ) {
-      if (!hasNotifRef.current) {
-        hasNotifRef.current = true;
-        setFavicon(true);
-      }
-      try {
-        const ctx = new (window.AudioContext || window.webkitAudioContext)();
-        const osc = ctx.createOscillator();
-        const gain = ctx.createGain();
-        osc.connect(gain);
-        gain.connect(ctx.destination);
-        osc.frequency.value = 520;
-        gain.gain.value = 0.15;
-        osc.start();
-        gain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + 0.15);
-        osc.stop(ctx.currentTime + 0.15);
-        osc.onended = () => ctx.close();
-      } catch {}
-    }
-  }, [login]);
-
-  useEffect(() => {
-    setFavicon(false);
-    const onVisible = () => {
-      if (hasNotifRef.current) {
-        hasNotifRef.current = false;
-        setFavicon(false);
-      }
-    };
-    document.addEventListener('visibilitychange', onVisible);
-    return () => {
-      document.removeEventListener('visibilitychange', onVisible);
-    };
-  }, []);
-
-  useEffect(() => {
-    if (!ws) return;
-
-    ws.onmessage = (event) => {
-      let msg;
-      try {
-        msg = JSON.parse(event.data);
-      } catch {
-        return;
-      }
-
-      if (msg.type === 'text') {
-        addMessage(msg);
-      } else if (msg.type === 'file') {
-        addMessage(msg);
-      } else if (msg.type === 'system') {
-        addMessage(msg);
-      } else if (msg.type === 'error') {
-        setError(msg.message);
-      }
-    };
-
-    ws.onclose = () => {
-      setConnected(false);
-      setError('Connection lost');
-    };
-
-    ws.onerror = () => {
-      setConnected(false);
-      setError('Connection error');
-    };
-  }, [ws, addMessage]);
+  const { messages, connected, error } = useChatMessages(ws, login);
 
   return (
     <div className="chat-container">
@@ -128,8 +13,7 @@ export default function Chat({ ws, login, onLogout }) {
         <h2>Chat room — logged in as <strong>{login}</strong></h2>
         <button className="logout-btn" onClick={onLogout}>Logout</button>
       </div>
-      {error && !connected && <div className="chat-error">{error}</div>}
-      {error && connected && <div className="chat-notification">{error}</div>}
+      {error && <div className={connected ? 'chat-notification' : 'chat-error'}>{error}</div>}
       <MessageList messages={messages} currentUser={login} />
       <MessageInput ws={ws} />
     </div>
diff --git a/client/src/components/Message.css b/client/src/components/Message.css
index 5a84d56..166a10b 100644
--- a/client/src/components/Message.css
+++ b/client/src/components/Message.css
@@ -127,3 +127,23 @@
   font-size: 0.85rem;
   margin-top: 0.3rem;
 }
+
+.message-audio, .message-video {
+  margin-top: 0.3rem;
+}
+
+.message-audio-player {
+  width: 100%;
+  height: 40px;
+  border-radius: 6px;
+  background: #1a1a2e;
+}
+
+.message-video-player {
+  width: 100%;
+  max-height: 300px;
+  border-radius: 8px;
+  display: block;
+  cursor: pointer;
+  background: #000;
+}
diff --git a/client/src/components/Message.jsx b/client/src/components/Message.jsx
index 257eedc..46016ae 100644
--- a/client/src/components/Message.jsx
+++ b/client/src/components/Message.jsx
@@ -1,77 +1,35 @@
-import React, { useMemo } from 'react';
+import React, { useMemo, useState } from 'react';
+import { linkifyText } from '../utils/linkify.jsx';
+import { dataURLToBlobUrl } from '../utils/blob';
 import './Message.css';
 
 function formatTime(ts) {
-  const d = new Date(ts);
-  return d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
+  return new Date(ts).toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
 }
 
-const URL_REGEX = /(https?:\/\/[^\s<]+[^\s<.,!?)}\]"'\\])/gi;
-
-function linkifyText(text) {
-  const parts = [];
-  let lastIndex = 0;
-  let match;
-  URL_REGEX.lastIndex = 0;
-  while ((match = URL_REGEX.exec(text)) !== null) {
-    if (match.index > lastIndex) {
-      parts.push(text.slice(lastIndex, match.index));
-    }
-    parts.push(
-      <a key={match.index} href={match[0]} target="_blank" rel="noopener noreferrer">
-        {match[0]}
-      </a>
-    );
-    lastIndex = match.index + match[0].length;
-  }
-  if (lastIndex < text.length) {
-    parts.push(text.slice(lastIndex));
-  }
-  return parts.length ? parts : text;
-}
-
-function dataURLToBlobUrl(dataUrl) {
-  try {
-    const arr = dataUrl.split(',');
-    const mime = arr[0].match(/:(.*?);/)[1];
-    const bstr = atob(arr[1]);
-    const n = bstr.length;
-    const u8arr = new Uint8Array(n);
-    for (let i = 0; i < n; i++) {
-      u8arr[i] = bstr.charCodeAt(i);
-    }
-    const blob = new Blob([u8arr], { type: mime });
-    return URL.createObjectURL(blob);
-  } catch {
-    return null;
-  }
-}
+const FILE_ICON = '\u{1F4CE}';
 
 export default function Message({ message, isOwn }) {
-  const isImage = message.mime && message.mime.startsWith('image/');
+  const [videoExpanded, setVideoExpanded] = useState(false);
+  const mime = message.mime;
   const isSystem = message.type === 'system';
   const isFile = message.type === 'file';
+  const typeGroup = isFile
+    ? mime?.startsWith('image/') ? 'image'
+      : mime?.startsWith('video/') ? 'video'
+        : mime?.startsWith('audio/') ? 'audio'
+          : 'file'
+    : null;
 
-  const blobUrl = useMemo(() => {
+  const fileUrl = useMemo(() => {
     if (isFile && message.data) {
-      return dataURLToBlobUrl(`data:${message.mime};base64,${message.data}`);
+      return dataURLToBlobUrl(`data:${mime};base64,${message.data}`);
     }
     return null;
-  }, [isFile, message.data, message.mime]);
-
-  const downloadUrl = useMemo(() => {
-    if (isFile && message.data && !isImage) {
-      return dataURLToBlobUrl(`data:${message.mime};base64,${message.data}`);
-    }
-    return null;
-  }, [isFile, message.data, message.mime, isImage]);
+  }, [isFile, message.data, mime]);
 
   if (isSystem) {
-    return (
-      <div className="message-system">
-        <span>{message.text}</span>
-      </div>
-    );
+    return <div className="message-system"><span>{message.text}</span></div>;
   }
 
   return (
@@ -82,31 +40,41 @@ export default function Message({ message, isOwn }) {
       </div>
       <div className="message-body">
         {message.text && <p>{linkifyText(message.text)}</p>}
-        {isFile && isImage && blobUrl && (
-          <a href={blobUrl} target="_blank" rel="noreferrer">
-            <img
-              className="message-image"
-              src={blobUrl}
-              alt={message.filename}
-            />
+        {isFile && typeGroup === 'image' && (fileUrl ? (
+          <a href={fileUrl} target="_blank" rel="noreferrer">
+            <img className="message-image" src={fileUrl} alt={message.filename} />
           </a>
-        )}
-        {isFile && isImage && !blobUrl && (
-          <div className="message-file-error">Failed to load image</div>
-        )}
-        {isFile && !isImage && downloadUrl && (
-          <a
-            className="message-file-link"
-            href={downloadUrl}
-            download={message.filename}
-          >
-            <span className="file-icon">&#128206;</span>
+        ) : <div className="message-file-error">Failed to load image</div>)}
+        {isFile && typeGroup === 'audio' && (fileUrl ? (
+          <div className="message-audio">
+            <audio controls src={fileUrl} className="message-audio-player" />
+            <a className="message-file-link" href={fileUrl} download={message.filename}>
+              <span className="file-icon">{FILE_ICON}</span>
+              {message.filename}
+            </a>
+          </div>
+        ) : <div className="message-file-error">Failed to load audio</div>)}
+        {isFile && typeGroup === 'video' && (fileUrl ? (
+          <div className="message-video">
+            <video
+              className="message-video-player"
+              src={fileUrl}
+              controls={videoExpanded}
+              preload="metadata"
+              onClick={() => setVideoExpanded(true)}
+            />
+            <a className="message-file-link" href={fileUrl} download={message.filename}>
+              <span className="file-icon">{FILE_ICON}</span>
+              {message.filename}
+            </a>
+          </div>
+        ) : <div className="message-file-error">Failed to load video</div>)}
+        {isFile && typeGroup === 'file' && (fileUrl ? (
+          <a className="message-file-link" href={fileUrl} download={message.filename}>
+            <span className="file-icon">{FILE_ICON}</span>
             {message.filename}
           </a>
-        )}
-        {isFile && !isImage && !downloadUrl && (
-          <div className="message-file-error">Failed to load file</div>
-        )}
+        ) : <div className="message-file-error">Failed to load file</div>)}
       </div>
     </div>
   );
diff --git a/client/src/components/MessageInput.jsx b/client/src/components/MessageInput.jsx
index de10638..f9b70cc 100644
--- a/client/src/components/MessageInput.jsx
+++ b/client/src/components/MessageInput.jsx
@@ -1,11 +1,21 @@
 import React, { useState, useRef } from 'react';
+import VoiceRecorder from './VoiceRecorder';
 import './MessageInput.css';
 
 const MAX_FILE_SIZE = 10 * 1024 * 1024;
 
+function readFileAsBase64(file) {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader();
+    reader.onload = () => resolve(reader.result.split(',')[1]);
+    reader.onerror = reject;
+    reader.readAsDataURL(file);
+  });
+}
+
 export default function MessageInput({ ws }) {
   const [text, setText] = useState('');
-  const fileInputRef = useRef(null);
+  const fileRef = useRef(null);
 
   const sendText = (e) => {
     e.preventDefault();
@@ -14,35 +24,27 @@ export default function MessageInput({ ws }) {
     setText('');
   };
 
-  const handleFileSelect = (e) => {
+  const handleFileSelect = async (e) => {
     const file = e.target.files[0];
+    e.target.value = '';
     if (!file) return;
 
     if (file.size > MAX_FILE_SIZE) {
       alert('File too large. Maximum is 10 MB.');
-      e.target.value = '';
       return;
     }
 
-    const reader = new FileReader();
-    reader.onload = () => {
-      const base64 = reader.result.split(',')[1];
+    try {
+      const data = await readFileAsBase64(file);
       ws.send(JSON.stringify({
         type: 'file',
         filename: file.name,
         mime: file.type || 'application/octet-stream',
-        data: base64
+        data,
       }));
-    };
-    reader.onerror = () => {
+    } catch {
       alert('Failed to read file');
-    };
-    reader.readAsDataURL(file);
-    e.target.value = '';
-  };
-
-  const handleAttachClick = () => {
-    fileInputRef.current?.click();
+    }
   };
 
   return (
@@ -55,17 +57,13 @@ export default function MessageInput({ ws }) {
           value={text}
           onChange={(e) => setText(e.target.value)}
         />
-        <button type="button" className="attach-btn" onClick={handleAttachClick} title="Attach file">
+        <VoiceRecorder ws={ws} />
+        <button type="button" className="attach-btn" onClick={() => fileRef.current?.click()} title="Attach file">
           &#128206;
         </button>
         <button type="submit" className="send-btn">Send</button>
       </form>
-      <input
-        ref={fileInputRef}
-        type="file"
-        className="file-input-hidden"
-        onChange={handleFileSelect}
-      />
+      <input ref={fileRef} type="file" className="file-input-hidden" onChange={handleFileSelect} />
     </div>
   );
 }
diff --git a/client/src/components/VoiceRecorder.css b/client/src/components/VoiceRecorder.css
new file mode 100644
index 0000000..8385166
--- /dev/null
+++ b/client/src/components/VoiceRecorder.css
@@ -0,0 +1,60 @@
+.voice-recorder {
+  display: flex;
+  align-items: center;
+  gap: 0.4rem;
+}
+
+.voice-recorder-btn {
+  padding: 0.7rem;
+  border: none;
+  border-radius: 8px;
+  cursor: pointer;
+  font-size: 1.1rem;
+  transition: background 0.2s;
+  background: #2a2a4a;
+  line-height: 1;
+}
+
+.voice-recorder-btn:hover {
+  background: #3a3a5a;
+}
+
+.voice-recorder-btn.recording {
+  background: #5c1a1a;
+  animation: pulse 1.2s ease-in-out infinite;
+}
+
+@keyframes pulse {
+  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 60, 60, 0.5); }
+  50% { box-shadow: 0 0 0 6px rgba(255, 60, 60, 0); }
+}
+
+.voice-recorder-btn:disabled {
+  opacity: 0.5;
+  cursor: default;
+}
+
+.voice-recorder-indicator {
+  display: flex;
+  align-items: center;
+  gap: 0.3rem;
+}
+
+.voice-recorder-dot {
+  width: 8px;
+  height: 8px;
+  border-radius: 50%;
+  background: #ff4444;
+  animation: blink 1s step-end infinite;
+}
+
+@keyframes blink {
+  50% { opacity: 0; }
+}
+
+.voice-recorder-timer {
+  font-size: 0.85rem;
+  color: #ff8a8a;
+  font-variant-numeric: tabular-nums;
+  min-width: 3em;
+}
diff --git a/client/src/components/VoiceRecorder.jsx b/client/src/components/VoiceRecorder.jsx
new file mode 100644
index 0000000..6dd6c54
--- /dev/null
+++ b/client/src/components/VoiceRecorder.jsx
@@ -0,0 +1,141 @@
+import React, { useState, useRef, useCallback, useEffect } from 'react';
+import './VoiceRecorder.css';
+
+function readFileAsBase64(file) {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader();
+    reader.onload = () => resolve(reader.result.split(',')[1]);
+    reader.onerror = reject;
+    reader.readAsDataURL(file);
+  });
+}
+
+function getSupportedMime() {
+  const types = [
+    'audio/webm;codecs=opus',
+    'audio/webm',
+    'audio/ogg;codecs=opus',
+    'audio/ogg',
+    'audio/mp4',
+  ];
+  return types.find(t => MediaRecorder.isTypeSupported(t)) || '';
+}
+
+function formatDuration(seconds) {
+  const m = String(Math.floor(seconds / 60)).padStart(2, '0');
+  const s = String(seconds % 60).padStart(2, '0');
+  return `${m}:${s}`;
+}
+
+export default function VoiceRecorder({ ws }) {
+  const [state, setState] = useState('idle');
+  const [duration, setDuration] = useState(0);
+  const mediaRecorderRef = useRef(null);
+  const chunksRef = useRef([]);
+  const streamRef = useRef(null);
+  const timerRef = useRef(null);
+
+  useEffect(() => {
+    return () => {
+      if (timerRef.current) clearInterval(timerRef.current);
+      if (streamRef.current) streamRef.current.getTracks().forEach(t => t.stop());
+    };
+  }, []);
+
+  const stopRecording = useCallback(() => {
+    if (mediaRecorderRef.current && mediaRecorderRef.current.state !== 'inactive') {
+      mediaRecorderRef.current.stop();
+    }
+    if (timerRef.current) {
+      clearInterval(timerRef.current);
+      timerRef.current = null;
+    }
+    if (streamRef.current) {
+      streamRef.current.getTracks().forEach(t => t.stop());
+      streamRef.current = null;
+    }
+  }, []);
+
+  const startRecording = useCallback(async () => {
+    try {
+      const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
+      streamRef.current = stream;
+    } catch {
+      alert('Microphone access denied');
+      return;
+    }
+
+    const mime = getSupportedMime();
+    chunksRef.current = [];
+
+    const recorder = new MediaRecorder(streamRef.current, mime ? { mimeType: mime } : {});
+    mediaRecorderRef.current = recorder;
+
+    recorder.ondataavailable = (e) => {
+      if (e.data.size > 0) chunksRef.current.push(e.data);
+    };
+
+    recorder.onstop = async () => {
+      setState('sending');
+      const blob = new Blob(chunksRef.current, { type: mime || 'audio/webm' });
+      const ext = mime.includes('mp4') ? '.mp4' : mime.includes('ogg') ? '.ogg' : '.webm';
+      const file = new File([blob], `voice${ext}`, { type: mime || 'audio/webm' });
+
+      try {
+        const data = await readFileAsBase64(file);
+        ws.send(JSON.stringify({
+          type: 'file',
+          filename: file.name,
+          mime: file.type,
+          data,
+        }));
+      } catch {
+        alert('Failed to send voice message');
+      }
+      setState('idle');
+      setDuration(0);
+    };
+
+    recorder.onerror = () => {
+      alert('Recording error');
+      setState('idle');
+      setDuration(0);
+    };
+
+    recorder.start(100);
+    setState('recording');
+    setDuration(0);
+
+    timerRef.current = setInterval(() => {
+      setDuration(prev => prev + 1);
+    }, 1000);
+  }, [ws]);
+
+  const handleClick = () => {
+    if (state === 'recording') {
+      stopRecording();
+    } else if (state === 'idle') {
+      startRecording();
+    }
+  };
+
+  return (
+    <div className={`voice-recorder ${state}`}>
+      {state === 'recording' && (
+        <div className="voice-recorder-indicator">
+          <span className="voice-recorder-dot" />
+          <span className="voice-recorder-timer">{formatDuration(duration)}</span>
+        </div>
+      )}
+      <button
+        type="button"
+        className={`voice-recorder-btn ${state}`}
+        onClick={handleClick}
+        disabled={state === 'sending'}
+        title={state === 'recording' ? 'Stop recording' : 'Record voice message'}
+      >
+        {state === 'sending' ? '...' : '\u{1F3A4}'}
+      </button>
+    </div>
+  );
+}
diff --git a/client/src/hooks/useChatMessages.js b/client/src/hooks/useChatMessages.js
new file mode 100644
index 0000000..a242f18
--- /dev/null
+++ b/client/src/hooks/useChatMessages.js
@@ -0,0 +1,68 @@
+import { useState, useCallback, useRef, useEffect } from 'react';
+import { playBeep, drawFavicon } from '../utils/notify';
+
+export default function useChatMessages(ws, login) {
+  const [messages, setMessages] = useState([]);
+  const [connected, setConnected] = useState(true);
+  const [error, setError] = useState('');
+  const hasNotifRef = useRef(false);
+
+  const addMessage = useCallback((msg) => {
+    setMessages(prev => [...prev, { ...msg, id: Date.now() + Math.random() }]);
+    if (
+      document.hidden &&
+      msg.from &&
+      msg.from !== login &&
+      (msg.type === 'text' || msg.type === 'file')
+    ) {
+      if (!hasNotifRef.current) {
+        hasNotifRef.current = true;
+        drawFavicon(true);
+      }
+      playBeep();
+    }
+  }, [login]);
+
+  useEffect(() => {
+    drawFavicon(false);
+    const onVisible = () => {
+      if (hasNotifRef.current) {
+        hasNotifRef.current = false;
+        drawFavicon(false);
+      }
+    };
+    document.addEventListener('visibilitychange', onVisible);
+    return () => document.removeEventListener('visibilitychange', onVisible);
+  }, []);
+
+  useEffect(() => {
+    if (!ws) return;
+
+    ws.onmessage = (event) => {
+      let msg;
+      try {
+        msg = JSON.parse(event.data);
+      } catch {
+        return;
+      }
+
+      if (msg.type === 'text' || msg.type === 'file' || msg.type === 'system') {
+        addMessage(msg);
+      } else if (msg.type === 'error') {
+        setError(msg.message);
+      }
+    };
+
+    ws.onclose = () => {
+      setConnected(false);
+      setError('Connection lost');
+    };
+
+    ws.onerror = () => {
+      setConnected(false);
+      setError('Connection error');
+    };
+  }, [ws, addMessage]);
+
+  return { messages, connected, error };
+}
diff --git a/client/src/hooks/useWebSocket.js b/client/src/hooks/useWebSocket.js
new file mode 100644
index 0000000..f1a619d
--- /dev/null
+++ b/client/src/hooks/useWebSocket.js
@@ -0,0 +1,73 @@
+import { useState, useRef, useCallback, useEffect } from 'react';
+
+const WS_URL = import.meta.env.VITE_WS_URL || 'ws://localhost:8080';
+
+export default function useWebSocket() {
+  const [login, setLogin] = useState('');
+  const [loggedIn, setLoggedIn] = useState(false);
+  const [error, setError] = useState('');
+  const [ws, setWs] = useState(null);
+  const loggedInRef = useRef(false);
+
+  const loginToServer = useCallback((userLogin, password) => {
+    setError('');
+    const socket = new WebSocket(WS_URL);
+
+    socket.onopen = () => {
+      socket.send(JSON.stringify({ type: 'auth', login: userLogin, password }));
+    };
+
+    socket.onmessage = (event) => {
+      let msg;
+      try {
+        msg = JSON.parse(event.data);
+      } catch {
+        return;
+      }
+
+      if (msg.type === 'auth_result') {
+        if (msg.success) {
+          setLogin(userLogin);
+          setLoggedIn(true);
+          loggedInRef.current = true;
+          setWs(socket);
+        } else {
+          setError(msg.reason || 'Authentication failed');
+          socket.close();
+        }
+      }
+    };
+
+    socket.onerror = () => {
+      if (!loggedInRef.current) {
+        setError('Cannot connect to server');
+      }
+    };
+
+    socket.onclose = () => {
+      if (!loggedInRef.current) {
+        setError('Connection closed');
+      }
+    };
+  }, []);
+
+  const logout = useCallback(() => {
+    if (ws) {
+      ws.close();
+    }
+    setWs(null);
+    setLogin('');
+    setLoggedIn(false);
+    loggedInRef.current = false;
+  }, [ws]);
+
+  useEffect(() => {
+    return () => {
+      if (ws) {
+        ws.close();
+      }
+    };
+  }, [ws]);
+
+  return { login, loggedIn, error, ws, loginToServer, logout };
+}
diff --git a/client/src/utils/blob.js b/client/src/utils/blob.js
new file mode 100644
index 0000000..e9ce947
--- /dev/null
+++ b/client/src/utils/blob.js
@@ -0,0 +1,16 @@
+export function dataURLToBlobUrl(dataUrl) {
+  try {
+    const arr = dataUrl.split(',');
+    const mime = arr[0].match(/:(.*?);/)[1];
+    const bstr = atob(arr[1]);
+    const n = bstr.length;
+    const u8arr = new Uint8Array(n);
+    for (let i = 0; i < n; i++) {
+      u8arr[i] = bstr.charCodeAt(i);
+    }
+    const blob = new Blob([u8arr], { type: mime });
+    return URL.createObjectURL(blob);
+  } catch {
+    return null;
+  }
+}
diff --git a/client/src/utils/linkify.jsx b/client/src/utils/linkify.jsx
new file mode 100644
index 0000000..bbf935a
--- /dev/null
+++ b/client/src/utils/linkify.jsx
@@ -0,0 +1,23 @@
+const URL_REGEX = /(https?:\/\/[^\s<]+[^\s<.,!?)}\]"'\\])/gi;
+
+export function linkifyText(text) {
+  const parts = [];
+  let lastIndex = 0;
+  let match;
+  URL_REGEX.lastIndex = 0;
+  while ((match = URL_REGEX.exec(text)) !== null) {
+    if (match.index > lastIndex) {
+      parts.push(text.slice(lastIndex, match.index));
+    }
+    parts.push(
+      <a key={match.index} href={match[0]} target="_blank" rel="noopener noreferrer">
+        {match[0]}
+      </a>
+    );
+    lastIndex = match.index + match[0].length;
+  }
+  if (lastIndex < text.length) {
+    parts.push(text.slice(lastIndex));
+  }
+  return parts.length ? parts : text;
+}
diff --git a/client/src/utils/notify.js b/client/src/utils/notify.js
new file mode 100644
index 0000000..89e92c8
--- /dev/null
+++ b/client/src/utils/notify.js
@@ -0,0 +1,51 @@
+export function playBeep() {
+  try {
+    const ctx = new (window.AudioContext || window.webkitAudioContext)();
+    const osc = ctx.createOscillator();
+    const gain = ctx.createGain();
+    osc.connect(gain);
+    gain.connect(ctx.destination);
+    osc.frequency.value = 520;
+    gain.gain.value = 0.15;
+    osc.start();
+    gain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + 0.15);
+    osc.stop(ctx.currentTime + 0.15);
+    osc.onended = () => ctx.close();
+  } catch { /* audio not supported */ }
+}
+
+export function drawFavicon(hasNotification) {
+  const canvas = document.createElement('canvas');
+  canvas.width = 32;
+  canvas.height = 32;
+  const ctx = canvas.getContext('2d');
+
+  ctx.fillStyle = '#4a9eff';
+  ctx.beginPath();
+  ctx.arc(16, 16, 14, 0, 2 * Math.PI);
+  ctx.fill();
+
+  ctx.fillStyle = '#fff';
+  ctx.font = 'bold 18px sans-serif';
+  ctx.textAlign = 'center';
+  ctx.textBaseline = 'middle';
+  ctx.fillText('CH', 16, 16);
+
+  if (hasNotification) {
+    ctx.fillStyle = '#ff4444';
+    ctx.beginPath();
+    ctx.arc(26, 6, 5, 0, 2 * Math.PI);
+    ctx.fill();
+    ctx.strokeStyle = '#1a1a2e';
+    ctx.lineWidth = 2;
+    ctx.stroke();
+  }
+
+  let link = document.querySelector('link[rel="icon"]');
+  if (!link) {
+    link = document.createElement('link');
+    link.rel = 'icon';
+    document.head.appendChild(link);
+  }
+  link.href = canvas.toDataURL();
+}
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index 839a3c2..f204e87 100644
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -1,16 +1,27 @@
 #!/bin/sh
 set -e
 
-# Start nginx in foreground
 nginx -g 'daemon off;' &
 NGINX_PID=$!
 
-# Start WebSocket server
-node /server/server.js &
-NODE_PID=$!
+trap 'kill $NGINX_PID 2>/dev/null; exit' SIGTERM SIGINT SIGQUIT
 
-# Forward signals to both processes
-trap 'kill $NGINX_PID $NODE_PID 2>/dev/null; exit' SIGTERM SIGINT
+shutdown() {
+  kill $NGINX_PID 2>/dev/null
+  exit
+}
 
-# Exit if node server stops
-wait $NODE_PID
+while true; do
+  node /server/server.js &
+  NODE_PID=$!
+  trap 'kill $NODE_PID $NGINX_PID 2>/dev/null; exit' SIGTERM SIGINT SIGQUIT
+  wait $NODE_PID
+  EXIT_CODE=$?
+
+  if [ $EXIT_CODE -eq 0 ] || [ $EXIT_CODE -eq 143 ] || [ $EXIT_CODE -eq 130 ] || [ $EXIT_CODE -eq 137 ]; then
+    shutdown
+  fi
+
+  echo "Server exited with code $EXIT_CODE, restarting in 1 second..."
+  sleep 1
+done
diff --git a/server/auth.js b/server/auth.js
new file mode 100644
index 0000000..415530e
--- /dev/null
+++ b/server/auth.js
@@ -0,0 +1,21 @@
+const fs = require('fs');
+const path = require('path');
+const config = require('./config');
+
+const usersPath = path.join(__dirname, config.usersFile);
+let users;
+
+try {
+  users = JSON.parse(fs.readFileSync(usersPath, 'utf-8'));
+  console.log(`Loaded ${users.length} user(s) from ${config.usersFile}`);
+} catch (err) {
+  console.error(`Failed to load ${config.usersFile}:`, err.message);
+  process.exit(1);
+}
+
+function authenticate(login, password) {
+  const user = users.find(u => u.login === login && u.password === password);
+  return user || null;
+}
+
+module.exports = { authenticate };
diff --git a/server/clients.js b/server/clients.js
new file mode 100644
index 0000000..f2d9415
--- /dev/null
+++ b/server/clients.js
@@ -0,0 +1,78 @@
+const config = require('./config');
+
+function createJsonSender(ws) {
+  return (data) => {
+    if (ws.readyState === 1) {
+      ws.send(JSON.stringify(data));
+    }
+  };
+}
+
+function createClientHandlers(ws, sendJson) {
+  let authenticated = false;
+  let login = null;
+
+  function getLogin() { return login; }
+
+  function handleAuth(userLogin) {
+    authenticated = true;
+    login = userLogin;
+    console.log(`Authenticated: ${login}`);
+    sendJson({ type: 'auth_result', success: true });
+    return { type: 'system', text: `${login} joined the chat` };
+  }
+
+  function handleAuthFail(reason) {
+    sendJson({ type: 'auth_result', success: false, reason });
+  }
+
+  function wrapHandler(handler) {
+    return (raw) => {
+      let parsed;
+      try {
+        parsed = JSON.parse(raw.toString());
+      } catch {
+        sendJson({ type: 'error', message: 'Invalid JSON' });
+        return null;
+      }
+
+      if (!authenticated) {
+        if (parsed.type === 'auth') {
+          return handler({ type: 'auth', login: parsed.login, password: parsed.password });
+        }
+        sendJson({ type: 'error', message: 'Authenticate first' });
+        return null;
+      }
+
+      return handler(parsed);
+    };
+  }
+
+  return { getLogin, handleAuth, handleAuthFail, wrapHandler };
+}
+
+function formatSizeEstimate(base64Length) {
+  return Math.ceil((base64Length * 3) / 4);
+}
+
+function validateFile(parsed) {
+  if (!parsed.filename || !parsed.mime || !parsed.data) {
+    return 'Invalid file message';
+  }
+  const size = formatSizeEstimate(parsed.data.length);
+  if (size > config.maxFileSize) {
+    return `File too large (max ${config.maxFileSize / 1024 / 1024} MB)`;
+  }
+  return null;
+}
+
+function broadcast(server, message, excludeWs) {
+  const json = JSON.stringify(message);
+  server.clients.forEach(client => {
+    if (client !== excludeWs && client.readyState === 1) {
+      client.send(json);
+    }
+  });
+}
+
+module.exports = { createJsonSender, createClientHandlers, validateFile, broadcast };
diff --git a/server/config.js b/server/config.js
new file mode 100644
index 0000000..563e93e
--- /dev/null
+++ b/server/config.js
@@ -0,0 +1,7 @@
+const config = {
+  port: parseInt(process.env.PORT, 10) || 8080,
+  maxFileSize: parseInt(process.env.MAX_FILE_SIZE, 10) || 10 * 1024 * 1024,
+  usersFile: process.env.USERS_FILE || 'users.json',
+};
+
+module.exports = config;
diff --git a/server/server.js b/server/server.js
index 7bffe0b..0f830fc 100644
--- a/server/server.js
+++ b/server/server.js
@@ -1,129 +1,68 @@
-const fs = require('fs');
-const path = require('path');
 const { WebSocketServer } = require('ws');
+const config = require('./config');
+const { authenticate } = require('./auth');
+const { createJsonSender, createClientHandlers, validateFile, broadcast } = require('./clients');
 
-const PORT = parseInt(process.env.PORT, 10) || 8080;
-const MAX_FILE_SIZE = parseInt(process.env.MAX_FILE_SIZE, 10) || 10 * 1024 * 1024;
+const server = new WebSocketServer({ port: config.port });
+console.log(`WebSocket server running on ws://0.0.0.0:${config.port}`);
 
-const usersPath = path.join(__dirname, process.env.USERS_FILE || 'users.json');
-let validUsers;
-try {
-  validUsers = JSON.parse(fs.readFileSync(usersPath, 'utf-8'));
-  console.log(`Loaded ${validUsers.length} users from users.json`);
-} catch (err) {
-  console.error('Failed to load users.json:', err.message);
-  process.exit(1);
-}
-
-function authenticate(login, password) {
-  return validUsers.find(u => u.login === login && u.password === password) || null;
-}
-
-const wss = new WebSocketServer({ port: PORT });
-console.log(`WebSocket server running on ws://localhost:${PORT}`);
-
-wss.on('connection', (ws, req) => {
+server.on('connection', (ws, req) => {
   const clientIp = req.socket.remoteAddress;
-  console.log(`New connection from ${clientIp}`);
+  console.log(`Connection from ${clientIp}`);
 
-  let authenticated = false;
-  let userLogin = null;
-
-  ws.on('message', (data) => {
-    let parsed;
-    try {
-      parsed = JSON.parse(data.toString());
-    } catch (e) {
-      ws.send(JSON.stringify({ type: 'error', message: 'Invalid JSON' }));
-      return;
-    }
-
-    if (!authenticated) {
-      if (parsed.type === 'auth') {
+  const send = createJsonSender(ws);
+  const client = createClientHandlers(ws, send);
+  const handle = client.wrapHandler((parsed) => {
+    switch (parsed.type) {
+      case 'auth': {
         const user = authenticate(parsed.login, parsed.password);
         if (user) {
-          authenticated = true;
-          userLogin = parsed.login;
-          console.log(`User authenticated: ${userLogin}`);
-          ws.send(JSON.stringify({ type: 'auth_result', success: true }));
-          broadcast({
-            type: 'system',
-            text: `${userLogin} joined the chat`
-          }, null);
-        } else {
-          console.log(`Auth failed for login: ${parsed.login}`);
-          ws.send(JSON.stringify({
-            type: 'auth_result',
-            success: false,
-            reason: 'Invalid login or password'
-          }));
+          return client.handleAuth(user.login);
         }
-      } else {
-        ws.send(JSON.stringify({ type: 'error', message: 'Authenticate first' }));
+        client.handleAuthFail('Invalid login or password');
+        return null;
       }
-      return;
+      case 'text': {
+        if (!parsed.text || typeof parsed.text !== 'string') {
+          send({ type: 'error', message: 'Invalid text message' });
+          return null;
+        }
+        console.log(`Text from ${client.getLogin()}: ${parsed.text.substring(0, 50)}`);
+        return { type: 'text', from: client.getLogin(), timestamp: Date.now(), text: parsed.text };
+      }
+      case 'file': {
+        const error = validateFile(parsed);
+        if (error) {
+          send({ type: 'error', message: error });
+          return null;
+        }
+        console.log(`File from ${client.getLogin()}: ${parsed.filename} (${parsed.mime})`);
+        return {
+          type: 'file', from: client.getLogin(), timestamp: Date.now(),
+          filename: parsed.filename, mime: parsed.mime, data: parsed.data,
+        };
+      }
+      default:
+        send({ type: 'error', message: 'Unknown message type' });
+        return null;
     }
-
-    if (parsed.type === 'text') {
-      if (!parsed.text || typeof parsed.text !== 'string') {
-        ws.send(JSON.stringify({ type: 'error', message: 'Invalid text message' }));
-        return;
-      }
-      console.log(`Text from ${userLogin}: ${parsed.text.substring(0, 50)}`);
-      broadcast({
-        type: 'text',
-        from: userLogin,
-        timestamp: Date.now(),
-        text: parsed.text
-      }, null);
-      return;
-    }
-
-    if (parsed.type === 'file') {
-      if (!parsed.filename || !parsed.mime || !parsed.data) {
-        ws.send(JSON.stringify({ type: 'error', message: 'Invalid file message' }));
-        return;
-      }
-      const size = Math.ceil((parsed.data.length * 3) / 4);
-      if (size > MAX_FILE_SIZE) {
-        ws.send(JSON.stringify({ type: 'error', message: 'File too large (max 10 MB)' }));
-        return;
-      }
-      console.log(`File from ${userLogin}: ${parsed.filename} (${parsed.mime}, ~${size} bytes)`);
-      broadcast({
-        type: 'file',
-        from: userLogin,
-        timestamp: Date.now(),
-        filename: parsed.filename,
-        mime: parsed.mime,
-        data: parsed.data
-      }, null);
-      return;
-    }
-
-    ws.send(JSON.stringify({ type: 'error', message: 'Unknown message type' }));
   });
 
-  ws.on('close', (code, reason) => {
-    console.log(`Connection closed${userLogin ? ` for ${userLogin}` : ''} (code: ${code})`);
-    if (userLogin) {
-      broadcast({
-        type: 'system',
-        text: `${userLogin} left the chat`
-      }, null);
+  ws.on('message', (raw) => {
+    const msg = handle(raw);
+    if (msg) {
+      broadcast(server, msg, null);
+    }
+  });
+
+  ws.on('close', (code) => {
+    console.log(`Disconnected: ${client.getLogin() || 'unauthenticated'} (code: ${code})`);
+    if (client.getLogin()) {
+      broadcast(server, { type: 'system', text: `${client.getLogin()} left the chat` }, null);
     }
   });
 
   ws.on('error', (err) => {
-    console.error(`WebSocket error${userLogin ? ` for ${userLogin}` : ''}:`, err.message);
+    console.error(`Socket error (${client.getLogin() || 'unknown'}):`, err.message);
   });
 });
-
-function broadcast(message, excludeWs) {
-  const json = JSON.stringify(message);
-  wss.clients.forEach(client => {
-    if (client !== excludeWs && client.readyState === 1) {
-      client.send(json);
-    }
-  });
-}