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feat: complete benzcloud-plugin-chat v1.0 with WebSockets, presence and web UI

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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
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the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# BenzCloud Chat Plugin (`benzcloud-plugin-chat`)
[![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
[![Go Version](https://img.shields.io/badge/Go-1.22+-00ADD8?logo=go)](https://golang.org)
[![Version](https://img.shields.io/badge/Version-v1.0-green.svg)](https://github.com/benzjeremy/benzcloud-plugin-chat)
The **BenzCloud Chat Plugin** provides a real-time, decentralized team chat service for the BenzCloud mesh ecosystem. Designed as a zero-dependency, self-hosted alternative to Slack and Discord, it operates purely over local encrypted peer-to-peer networks.
---
## 🌟 Key Features
- **Real-Time WebSocket Architecture:** Low-latency bi-directional messaging with instant delivery.
- **Dynamic Channels & Topics:** Pre-configured `#general`, `#dev`, `#random` rooms with on-the-fly channel creation.
- **Live User Presence:** Instant peer online/offline tracking across the local mesh.
- **Embedded Web UI:** Cybernetic Dark interface inspired by modern team chat tools with a dual-language toggle (DE / EN), avatar badge generation, and responsive mobile-friendly layout.
- **BenzCloud Service Integration:** Auto-discovers with `benzcloud-server` via `/health` API for automatic DNS mapping (`chat.<domain>`) and reverse-proxy routing.
- **Decentralized Persistence:** Zero cloud telemetry. All message logs and channels persist locally in structured JSON records.
---
## 🚀 Quick Start
### Running the Plugin
```bash
./benzcloud-plugin-chat -port=8093 -data=./data -domain=benzcloud.local
```
### Command-line Options
- `-port <number>`: Web UI and WebSocket server port (default: `8093`).
- `-data <path>`: Local storage directory for chat history (default: `./data`).
- `-domain <name>`: Base mesh domain (default: `benzcloud.local`).
---
## 🛡️ License
This project is licensed under the [GNU General Public License v3.0 (GPL-3.0)](LICENSE).

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module github.com/benzjeremy/benzcloud-plugin-chat
go 1.27.1
require github.com/gorilla/websocket v1.5.3 // indirect

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github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=

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package chat
import (
"os"
"testing"
"time"
)
func TestChatStore(t *testing.T) {
tmpDir, err := os.MkdirTemp("", "chat_test_*")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmpDir)
store, err := NewStore(tmpDir)
if err != nil {
t.Fatalf("failed to create store: %v", err)
}
// Verify default channels
channels := store.GetChannels()
if len(channels) < 3 {
t.Fatalf("expected at least 3 channels, got %d", len(channels))
}
// Create custom channel
ch, err := store.CreateChannel("marketing", "Marketing strategies", "alice")
if err != nil {
t.Fatalf("failed to create channel: %v", err)
}
if ch.Name != "marketing" {
t.Fatalf("expected channel name 'marketing', got %s", ch.Name)
}
// Save message
msg := &Message{
Channel: "marketing",
Sender: "alice",
Content: "Launch campaign is ready!",
Type: TypeMessage,
Timestamp: time.Now().UTC(),
}
if err := store.SaveMessage(msg); err != nil {
t.Fatalf("failed to save message: %v", err)
}
// Retrieve messages
msgs := store.GetMessages("marketing", 10)
if len(msgs) != 1 {
t.Fatalf("expected 1 message, got %d", len(msgs))
}
if msgs[0].Content != "Launch campaign is ready!" {
t.Fatalf("unexpected content: %s", msgs[0].Content)
}
// Test persistence reload
store2, err := NewStore(tmpDir)
if err != nil {
t.Fatalf("failed to reload store: %v", err)
}
msgs2 := store2.GetMessages("marketing", 10)
if len(msgs2) != 1 {
t.Fatalf("expected 1 reloaded message, got %d", len(msgs2))
}
}
func TestHubOnlineUsers(t *testing.T) {
tmpDir, err := os.MkdirTemp("", "hub_test_*")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmpDir)
store, _ := NewStore(tmpDir)
hub := NewHub(store)
go hub.Run()
users := hub.GetOnlineUsers()
if len(users) != 0 {
t.Fatalf("expected 0 online users, got %d", len(users))
}
}

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package chat
import (
"encoding/json"
"log"
"net/http"
"sync"
"time"
"github.com/gorilla/websocket"
)
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool {
return true // Local mesh network trusted origin
},
}
// Client represents a connected user session.
type Client struct {
hub *Hub
conn *websocket.Conn
send chan []byte
username string
}
// Hub coordinates all active client connections and broadcasts.
type Hub struct {
store *Store
clients map[*Client]bool
userCounts map[string]int
broadcast chan *Message
register chan *Client
unregister chan *Client
mu sync.RWMutex
}
// NewHub creates a new chat hub.
func NewHub(store *Store) *Hub {
return &Hub{
store: store,
clients: make(map[*Client]bool),
userCounts: make(map[string]int),
broadcast: make(chan *Message, 256),
register: make(chan *Client),
unregister: make(chan *Client),
}
}
// Run executes the main event coordination loop.
func (h *Hub) Run() {
for {
select {
case client := <-h.register:
h.mu.Lock()
h.clients[client] = true
h.userCounts[client.username]++
h.mu.Unlock()
// Broadcast presence update
h.broadcastPresence()
case client := <-h.unregister:
h.mu.Lock()
if _, ok := h.clients[client]; ok {
delete(h.clients, client)
close(client.send)
h.userCounts[client.username]--
if h.userCounts[client.username] <= 0 {
delete(h.userCounts, client.username)
}
}
h.mu.Unlock()
// Broadcast presence update
h.broadcastPresence()
case msg := <-h.broadcast:
// Save message
_ = h.store.SaveMessage(msg)
data, err := json.Marshal(msg)
if err != nil {
continue
}
h.mu.RLock()
for client := range h.clients {
select {
case client.send <- data:
default:
close(client.send)
delete(h.clients, client)
}
}
h.mu.RUnlock()
}
}
}
func (h *Hub) broadcastPresence() {
h.mu.RLock()
users := make([]string, 0, len(h.userCounts))
for u := range h.userCounts {
users = append(users, u)
}
h.mu.RUnlock()
presenceMsg := map[string]interface{}{
"type": "presence",
"users": users,
}
data, _ := json.Marshal(presenceMsg)
h.mu.RLock()
for client := range h.clients {
select {
case client.send <- data:
default:
}
}
h.mu.RUnlock()
}
// GetOnlineUsers returns list of currently connected user handles.
func (h *Hub) GetOnlineUsers() []string {
h.mu.RLock()
defer h.mu.RUnlock()
users := make([]string, 0, len(h.userCounts))
for u := range h.userCounts {
users = append(users, u)
}
return users
}
// Broadcast sends a message to the hub loop.
func (h *Hub) Broadcast(msg *Message) {
h.broadcast <- msg
}
// ServeWS handles incoming WebSocket upgrade requests.
func (h *Hub) ServeWS(w http.ResponseWriter, r *http.Request, username string) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Printf("[BenzCloud Chat] WebSocket upgrade failed: %v", err)
return
}
client := &Client{
hub: h,
conn: conn,
send: make(chan []byte, 256),
username: username,
}
h.register <- client
go client.writePump()
go client.readPump()
}
func (c *Client) readPump() {
defer func() {
c.hub.unregister <- c
c.conn.Close()
}()
c.conn.SetReadLimit(65536)
_ = c.conn.SetReadDeadline(time.Now().Add(60 * time.Second))
c.conn.SetPongHandler(func(string) error {
_ = c.conn.SetReadDeadline(time.Now().Add(60 * time.Second))
return nil
})
for {
_, message, err := c.conn.ReadMessage()
if err != nil {
break
}
var msg Message
if err := json.Unmarshal(message, &msg); err == nil {
if msg.Sender == "" {
msg.Sender = c.username
}
if msg.Timestamp.IsZero() {
msg.Timestamp = time.Now().UTC()
}
if msg.Type == "" {
msg.Type = TypeMessage
}
c.hub.broadcast <- &msg
}
}
}
func (c *Client) writePump() {
ticker := time.NewTicker(25 * time.Second)
defer func() {
ticker.Stop()
c.conn.Close()
}()
for {
select {
case message, ok := <-c.send:
_ = c.conn.SetWriteDeadline(time.Now().Add(10 * time.Second))
if !ok {
_ = c.conn.WriteMessage(websocket.CloseMessage, []byte{})
return
}
w, err := c.conn.NextWriter(websocket.TextMessage)
if err != nil {
return
}
_, _ = w.Write(message)
if err := w.Close(); err != nil {
return
}
case <-ticker.C:
_ = c.conn.SetWriteDeadline(time.Now().Add(10 * time.Second))
if err := c.conn.WriteMessage(websocket.PingMessage, nil); err != nil {
return
}
}
}
}

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package chat
import "time"
// MessageType indicates the nature of the message.
type MessageType string
const (
TypeMessage MessageType = "message"
TypeJoin MessageType = "join"
TypeLeave MessageType = "leave"
TypeSystem MessageType = "system"
TypePing MessageType = "ping"
TypePong MessageType = "pong"
)
// Message models a chat event or payload.
type Message struct {
ID string `json:"id"`
Channel string `json:"channel"`
Sender string `json:"sender"`
Content string `json:"content"`
Type MessageType `json:"type"`
Timestamp time.Time `json:"timestamp"`
}
// Channel models a chat room.
type Channel struct {
Name string `json:"name"`
Topic string `json:"topic"`
IsDirect bool `json:"is_direct"`
CreatedBy string `json:"created_by"`
}

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package chat
import (
"encoding/json"
"fmt"
"os"
"path/filepath"
"strings"
"sync"
"time"
)
// Store handles persistence for chat channels and message logs.
type Store struct {
dataDir string
channels map[string]*Channel
history map[string][]*Message // keyed by channel name
mu sync.RWMutex
}
// NewStore initializes channel and message storage.
func NewStore(dataDir string) (*Store, error) {
chDir := filepath.Join(dataDir, "chat_history")
if err := os.MkdirAll(chDir, 0700); err != nil {
return nil, fmt.Errorf("failed to create chat directory: %w", err)
}
s := &Store{
dataDir: chDir,
channels: make(map[string]*Channel),
history: make(map[string][]*Message),
}
// Setup default channels
s.channels["general"] = &Channel{Name: "general", Topic: "General team discussion and announcements", CreatedBy: "system"}
s.channels["dev"] = &Channel{Name: "dev", Topic: "Engineering, git commits, and tech topics", CreatedBy: "system"}
s.channels["random"] = &Channel{Name: "random", Topic: "Casual coffee break and memes", CreatedBy: "system"}
_ = s.loadAll()
return s, nil
}
func (s *Store) channelFile(name string) string {
clean := strings.ToLower(strings.TrimSpace(name))
clean = strings.ReplaceAll(clean, "/", "_")
return filepath.Join(s.dataDir, clean+".json")
}
func (s *Store) loadAll() error {
entries, err := os.ReadDir(s.dataDir)
if err != nil {
return err
}
for _, e := range entries {
if !e.IsDir() && strings.HasSuffix(e.Name(), ".json") {
chName := strings.TrimSuffix(e.Name(), ".json")
data, err := os.ReadFile(filepath.Join(s.dataDir, e.Name()))
if err == nil {
var msgs []*Message
if err := json.Unmarshal(data, &msgs); err == nil {
s.history[chName] = msgs
if _, exists := s.channels[chName]; !exists {
s.channels[chName] = &Channel{Name: chName, Topic: "Discussions in #" + chName, CreatedBy: "user"}
}
}
}
}
}
return nil
}
func (s *Store) saveChannel(name string) error {
msgs := s.history[name]
data, err := json.MarshalIndent(msgs, "", " ")
if err != nil {
return err
}
cFile := s.channelFile(name)
tmp := cFile + ".tmp"
if err := os.WriteFile(tmp, data, 0600); err != nil {
return err
}
return os.Rename(tmp, cFile)
}
// SaveMessage appends a message to the channel history.
func (s *Store) SaveMessage(msg *Message) error {
s.mu.Lock()
defer s.mu.Unlock()
ch := strings.ToLower(msg.Channel)
if msg.ID == "" {
msg.ID = fmt.Sprintf("msg_%d", time.Now().UnixNano())
}
if msg.Timestamp.IsZero() {
msg.Timestamp = time.Now().UTC()
}
s.history[ch] = append(s.history[ch], msg)
if _, exists := s.channels[ch]; !exists {
s.channels[ch] = &Channel{Name: ch, Topic: "Discussions in #" + ch, CreatedBy: msg.Sender}
}
return s.saveChannel(ch)
}
// GetMessages retrieves recent messages for a channel.
func (s *Store) GetMessages(channel string, limit int) []*Message {
s.mu.RLock()
defer s.mu.RUnlock()
ch := strings.ToLower(channel)
msgs := s.history[ch]
if len(msgs) == 0 {
return []*Message{}
}
if limit <= 0 || limit > len(msgs) {
limit = len(msgs)
}
start := len(msgs) - limit
result := make([]*Message, limit)
for i := 0; i < limit; i++ {
copyM := *msgs[start+i]
result[i] = &copyM
}
return result
}
// GetChannels returns list of all channels.
func (s *Store) GetChannels() []*Channel {
s.mu.RLock()
defer s.mu.RUnlock()
var list []*Channel
for _, c := range s.channels {
copyC := *c
list = append(list, &copyC)
}
return list
}
// CreateChannel creates a new channel if it doesn't already exist.
func (s *Store) CreateChannel(name, topic, createdBy string) (*Channel, error) {
s.mu.Lock()
defer s.mu.Unlock()
clean := strings.ToLower(strings.TrimSpace(name))
clean = strings.TrimPrefix(clean, "#")
if clean == "" {
return nil, fmt.Errorf("channel name cannot be empty")
}
if ch, exists := s.channels[clean]; exists {
return ch, nil
}
ch := &Channel{
Name: clean,
Topic: topic,
CreatedBy: createdBy,
}
s.channels[clean] = ch
_ = s.saveChannel(clean)
return ch, nil
}

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package main
import (
"embed"
"encoding/json"
"flag"
"fmt"
"io/fs"
"log"
"net/http"
"os"
"os/signal"
"strconv"
"strings"
"syscall"
"time"
"github.com/benzjeremy/benzcloud-plugin-chat/internal/chat"
)
//go:embed web/*
var webFS embed.FS
func main() {
port := flag.Int("port", 8093, "HTTP & WebSocket server port")
dataDir := flag.String("data", "./data", "Directory for chat history")
baseDomain := flag.String("domain", "benzcloud.local", "Base domain for chat")
flag.Parse()
log.Printf("[BenzCloud Chat] Initializing Chat Plugin v1.0 on %s (Port %d)\n", *baseDomain, *port)
store, err := chat.NewStore(*dataDir)
if err != nil {
log.Fatalf("Failed to initialize chat store: %v", err)
}
// Seed welcome message if #general is empty
genMsgs := store.GetMessages("general", 1)
if len(genMsgs) == 0 {
_ = store.SaveMessage(&chat.Message{
Channel: "general",
Sender: "BenzCloud Bot",
Content: "Welcome to your private, decentralized Mesh Chat! Real-time messaging with end-to-end local sovereignty.",
Type: chat.TypeMessage,
Timestamp: time.Now().UTC(),
})
}
hub := chat.NewHub(store)
go hub.Run()
mux := http.NewServeMux()
// Health endpoint for BenzCloud Supervisor / Router
mux.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
_ = json.NewEncoder(w).Encode(map[string]interface{}{
"status": "ok",
"plugin": "chat",
"version": "v1.0",
"subdomain": "chat",
"port": *port,
})
})
// WebSocket handler
mux.HandleFunc("/ws", func(w http.ResponseWriter, r *http.Request) {
user := r.URL.Query().Get("user")
if user == "" {
user = "anonymous"
}
hub.ServeWS(w, r, user)
})
// API: Channels
mux.HandleFunc("/api/chat/channels", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
if r.Method == http.MethodGet {
channels := store.GetChannels()
_ = json.NewEncoder(w).Encode(channels)
return
}
if r.Method == http.MethodPost {
var body struct {
Name string `json:"name"`
Topic string `json:"topic"`
CreatedBy string `json:"created_by"`
}
if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
ch, err := store.CreateChannel(body.Name, body.Topic, body.CreatedBy)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
_ = json.NewEncoder(w).Encode(ch)
return
}
http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
})
// API: Messages
mux.HandleFunc("/api/chat/messages", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
if r.Method == http.MethodGet {
ch := r.URL.Query().Get("channel")
if ch == "" {
ch = "general"
}
limit := 50
if lStr := r.URL.Query().Get("limit"); lStr != "" {
if l, err := strconv.Atoi(lStr); err == nil && l > 0 {
limit = l
}
}
msgs := store.GetMessages(ch, limit)
_ = json.NewEncoder(w).Encode(msgs)
return
}
if r.Method == http.MethodPost {
var msg chat.Message
if err := json.NewDecoder(r.Body).Decode(&msg); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
if msg.Channel == "" {
msg.Channel = "general"
}
if msg.Sender == "" {
msg.Sender = "anonymous"
}
if msg.Timestamp.IsZero() {
msg.Timestamp = time.Now().UTC()
}
hub.Broadcast(&msg)
_ = json.NewEncoder(w).Encode(msg)
return
}
http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
})
// Static Web Chat Files
subWeb, err := fs.Sub(webFS, "web")
if err != nil {
log.Fatalf("Failed to create sub filesystem: %v", err)
}
fileServer := http.FileServer(http.FS(subWeb))
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if !strings.HasPrefix(r.URL.Path, "/api/") && r.URL.Path != "/ws" && r.URL.Path != "/health" {
fileServer.ServeHTTP(w, r)
return
}
})
server := &http.Server{
Addr: fmt.Sprintf("0.0.0.0:%d", *port),
Handler: mux,
}
go func() {
log.Printf("[BenzCloud Chat] Web Chat & WebSocket listening on http://0.0.0.0:%d\n", *port)
if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
log.Fatalf("Chat HTTP server error: %v", err)
}
}()
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)
<-sigChan
log.Println("[BenzCloud Chat] Shutting down gracefully...")
_ = server.Close()
}

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const i18n = {
de: {
badge_realtime: "Echtzeit Mesh-Chat",
label_user: "Name:",
title_channels: "KANÄLE",
title_online: "ONLINE",
status_connected: "Verbunden",
status_connecting: "Verbinde...",
status_disconnected: "Getrennt",
placeholder_input: "Nachricht an #{channel} schreiben...",
btn_send: "Senden",
modal_new_channel_title: "Neuen Kanal erstellen",
label_channel_name: "Kanalname:",
label_channel_topic: "Thema / Beschreibung:",
btn_cancel: "Abbrechen",
btn_create: "Erstellen",
no_messages: "Keine Nachrichten bisher. Sei der Erste!",
},
en: {
badge_realtime: "Realtime Mesh Chat",
label_user: "Name:",
title_channels: "CHANNELS",
title_online: "ONLINE",
status_connected: "Connected",
status_connecting: "Connecting...",
status_disconnected: "Disconnected",
placeholder_input: "Message #{channel}...",
btn_send: "Send",
modal_new_channel_title: "Create New Channel",
label_channel_name: "Channel Name:",
label_channel_topic: "Topic / Description:",
btn_cancel: "Cancel",
btn_create: "Create",
no_messages: "No messages yet. Say hello!",
}
};
let currentLang = localStorage.getItem("benzcloud_lang") || "de";
let currentUser = localStorage.getItem("benzcloud_chat_user") || "admin";
let currentChannel = "general";
let channels = [];
let onlineUsers = [];
let ws = null;
let reconnectTimer = null;
const AVATAR_COLORS = [
"#38bdf8", "#818cf8", "#c084fc", "#f472b6", "#fb7185",
"#34d399", "#4ade80", "#fbbf24", "#f87171"
];
function getAvatarColor(name) {
let hash = 0;
for (let i = 0; i < name.length; i++) {
hash = name.charCodeAt(i) + ((hash << 5) - hash);
}
return AVATAR_COLORS[Math.abs(hash) % AVATAR_COLORS.length];
}
function setLang(lang) {
currentLang = lang;
localStorage.setItem("benzcloud_lang", lang);
document.documentElement.lang = lang;
document.querySelectorAll("[data-i18n]").forEach(el => {
const key = el.getAttribute("data-i18n");
if (i18n[lang] && i18n[lang][key]) {
el.textContent = i18n[lang][key];
}
});
document.getElementById("btnDe").classList.toggle("active", lang === "de");
document.getElementById("btnEn").classList.toggle("active", lang === "en");
updateInputPlaceholder();
}
function updateInputPlaceholder() {
const input = document.getElementById("chatInput");
input.placeholder = i18n[currentLang].placeholder_input.replace("{channel}", currentChannel);
}
// WebSocket Connection
function connectWS() {
if (ws) {
ws.close();
}
const proto = window.location.protocol === "https:" ? "wss:" : "ws:";
const wsUrl = `${proto}//${window.location.host}/ws?user=${encodeURIComponent(currentUser)}`;
const statusEl = document.getElementById("wsStatus");
const labelEl = statusEl.querySelector(".status-label");
statusEl.className = "connection-status";
labelEl.textContent = i18n[currentLang].status_connecting;
ws = new WebSocket(wsUrl);
ws.onopen = () => {
statusEl.className = "connection-status";
labelEl.textContent = i18n[currentLang].status_connected;
if (reconnectTimer) {
clearTimeout(reconnectTimer);
reconnectTimer = null;
}
};
ws.onmessage = (event) => {
try {
const data = JSON.parse(event.data);
if (data.type === "presence") {
updatePresence(data.users);
} else if (data.channel) {
if (data.channel.toLowerCase() === currentChannel.toLowerCase()) {
appendMessage(data);
}
}
} catch (e) {
console.error("Error parsing WS message", e);
}
};
ws.onclose = () => {
statusEl.className = "connection-status disconnected";
labelEl.textContent = i18n[currentLang].status_disconnected;
if (!reconnectTimer) {
reconnectTimer = setTimeout(connectWS, 3000);
}
};
ws.onerror = () => {
ws.close();
};
}
function updatePresence(users) {
onlineUsers = users || [];
document.getElementById("onlineCount").textContent = onlineUsers.length;
const container = document.getElementById("onlineUsersList");
container.innerHTML = "";
onlineUsers.forEach(u => {
const item = document.createElement("div");
item.className = "user-item";
item.innerHTML = `
<span class="status-indicator"></span>
<span class="user-handle">${escapeHtml(u)}</span>
`;
container.appendChild(item);
});
}
// Channels & Messages
async function loadChannels() {
try {
const res = await fetch("/api/chat/channels");
if (res.ok) {
channels = await res.json();
renderChannels();
}
} catch (err) {
console.error("Failed to load channels", err);
}
}
function renderChannels() {
const list = document.getElementById("channelList");
list.innerHTML = "";
channels.forEach(ch => {
const btn = document.createElement("button");
btn.className = `channel-item ${ch.name.toLowerCase() === currentChannel.toLowerCase() ? "active" : ""}`;
btn.innerHTML = `<span class="channel-prefix">#</span> ${escapeHtml(ch.name)}`;
btn.addEventListener("click", () => switchChannel(ch.name));
list.appendChild(btn);
});
const activeObj = channels.find(c => c.name.toLowerCase() === currentChannel.toLowerCase());
if (activeObj) {
document.getElementById("channelHeaderTitle").textContent = `#${activeObj.name}`;
document.getElementById("channelHeaderTopic").textContent = activeObj.topic || "";
}
updateInputPlaceholder();
}
async function switchChannel(channelName) {
currentChannel = channelName.toLowerCase();
renderChannels();
await loadMessages();
}
async function loadMessages() {
const stream = document.getElementById("messageStream");
stream.innerHTML = "";
try {
const res = await fetch(`/api/chat/messages?channel=${encodeURIComponent(currentChannel)}&limit=100`);
if (res.ok) {
const messages = await res.json();
if (!messages || messages.length === 0) {
stream.innerHTML = `<div class="empty-state" style="color: var(--text-subtle); text-align: center; margin-top: 2rem;">${i18n[currentLang].no_messages}</div>`;
} else {
messages.forEach(m => appendMessage(m, false));
scrollToBottom();
}
}
} catch (err) {
console.error("Failed to load messages", err);
}
}
function appendMessage(msg, scroll = true) {
const stream = document.getElementById("messageStream");
const emptyState = stream.querySelector(".empty-state");
if (emptyState) emptyState.remove();
const row = document.createElement("div");
row.className = "message-row";
const sender = msg.sender || "Anonymous";
const initials = sender.substring(0, 2).toUpperCase();
const avatarColor = getAvatarColor(sender);
const timeStr = new Date(msg.timestamp).toLocaleTimeString([], { hour: "2-digit", minute: "2-digit" });
row.innerHTML = `
<div class="avatar" style="background-color: ${avatarColor}">${initials}</div>
<div class="message-content">
<div class="message-meta">
<span class="sender-name">${escapeHtml(sender)}</span>
<span class="msg-timestamp">${timeStr}</span>
</div>
<div class="msg-text">${escapeHtml(msg.content)}</div>
</div>
`;
stream.appendChild(row);
if (scroll) {
scrollToBottom();
}
}
function scrollToBottom() {
const stream = document.getElementById("messageStream");
stream.scrollTop = stream.scrollHeight;
}
function sendMessage(e) {
e.preventDefault();
const input = document.getElementById("chatInput");
const text = input.value.trim();
if (!text) return;
const payload = {
channel: currentChannel,
sender: currentUser,
content: text,
type: "message",
timestamp: new Date().toISOString()
};
if (ws && ws.readyState === WebSocket.OPEN) {
ws.send(JSON.stringify(payload));
input.value = "";
} else {
// Fallback via HTTP API if WS is disconnected
fetch("/api/chat/messages", {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify(payload)
}).then(() => {
input.value = "";
loadMessages();
});
}
}
// Modal handling
function openModal() {
document.getElementById("channelModal").style.display = "flex";
document.getElementById("newChannelName").value = "";
document.getElementById("newChannelTopic").value = "";
document.getElementById("newChannelName").focus();
}
function closeModal() {
document.getElementById("channelModal").style.display = "none";
}
async function handleCreateChannel(e) {
e.preventDefault();
const name = document.getElementById("newChannelName").value.trim().toLowerCase();
const topic = document.getElementById("newChannelTopic").value.trim();
if (!name) return;
try {
const res = await fetch("/api/chat/channels", {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({ name, topic, created_by: currentUser })
});
if (res.ok) {
closeModal();
await loadChannels();
switchChannel(name);
}
} catch (err) {
alert("Error creating channel: " + err.message);
}
}
function escapeHtml(str) {
return (str || "").replace(/[&<>"']/g, function (m) {
return { "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" }[m];
});
}
// Init
document.addEventListener("DOMContentLoaded", async () => {
setLang(currentLang);
document.getElementById("btnDe").addEventListener("click", () => setLang("de"));
document.getElementById("btnEn").addEventListener("click", () => setLang("en"));
const userField = document.getElementById("usernameInput");
userField.value = currentUser;
userField.addEventListener("change", (e) => {
currentUser = e.target.value.trim() || "admin";
localStorage.setItem("benzcloud_chat_user", currentUser);
connectWS();
});
document.getElementById("chatForm").addEventListener("submit", sendMessage);
document.getElementById("btnNewChannel").addEventListener("click", openModal);
document.getElementById("btnCloseModal").addEventListener("click", closeModal);
document.getElementById("btnCancelChannel").addEventListener("click", closeModal);
document.getElementById("newChannelForm").addEventListener("submit", handleCreateChannel);
await loadChannels();
await loadMessages();
connectWS();
});

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<!DOCTYPE html>
<html lang="de">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>BenzCloud Chat</title>
<link rel="stylesheet" href="style.css">
<link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%2338bdf8'><path d='M20 2H4c-1.1 0-2 .9-2 2v18l4-4h14c1.1 0 2-.9 2-2V4c0-1.1-.9-2-2-2z'/></svg>">
</head>
<body>
<header class="app-header">
<div class="header-left">
<span class="logo-icon">💬</span>
<span class="brand-title">BenzCloud Chat</span>
<span class="brand-badge" data-i18n="badge_realtime">Echtzeit Mesh-Chat</span>
</div>
<div class="header-right">
<div class="user-select-box">
<label for="usernameInput" data-i18n="label_user">Name:</label>
<input type="text" id="usernameInput" value="admin" maxlength="24" title="Benutzername">
</div>
<div class="lang-switcher">
<button id="btnDe" class="btn-lang active">DE</button>
<button id="btnEn" class="btn-lang">EN</button>
</div>
</div>
</header>
<div class="chat-container">
<!-- Channel Sidebar -->
<aside class="sidebar-channels">
<div class="sidebar-section-header">
<span data-i18n="title_channels">KANÄLE</span>
<button id="btnNewChannel" class="btn-add" title="Neuen Kanal anlegen">+</button>
</div>
<div id="channelList" class="channel-list">
<!-- Channels injected dynamically -->
</div>
<div class="sidebar-section-header" style="margin-top: 1.5rem;">
<span data-i18n="title_online">ONLINE</span>
<span id="onlineCount" class="badge">1</span>
</div>
<div id="onlineUsersList" class="online-users-list">
<!-- Online users injected dynamically -->
</div>
</aside>
<!-- Chat Area -->
<main class="chat-main">
<div class="chat-header">
<div class="channel-info">
<h2 id="channelHeaderTitle">#general</h2>
<p id="channelHeaderTopic" class="channel-topic">Team-Diskussionen und Ankündigungen</p>
</div>
<div class="connection-status" id="wsStatus">
<span class="status-dot"></span>
<span class="status-label" data-i18n="status_connected">Verbunden</span>
</div>
</div>
<div id="messageStream" class="message-stream">
<!-- Messages rendered here -->
</div>
<form id="chatForm" class="chat-input-container">
<input type="text" id="chatInput" placeholder="Nachricht an #general schreiben..." autocomplete="off" required>
<button type="submit" id="btnSend" class="btn btn-primary">
<span>➤</span>
<span data-i18n="btn_send">Senden</span>
</button>
</form>
</main>
</div>
<!-- Create Channel Modal -->
<div id="channelModal" class="modal-overlay" style="display: none;">
<div class="modal-card">
<div class="modal-header">
<h3 data-i18n="modal_new_channel_title">Neuen Kanal erstellen</h3>
<button id="btnCloseModal" class="btn-close">&times;</button>
</div>
<form id="newChannelForm" class="modal-body">
<div class="form-group">
<label for="newChannelName" data-i18n="label_channel_name">Kanalname:</label>
<div class="input-with-prefix">
<span class="prefix">#</span>
<input type="text" id="newChannelName" required placeholder="z. B. marketing" pattern="[a-zA-Z0-9_-]+">
</div>
</div>
<div class="form-group">
<label for="newChannelTopic" data-i18n="label_channel_topic">Thema / Beschreibung:</label>
<input type="text" id="newChannelTopic" placeholder="Worum geht es in diesem Kanal?">
</div>
<div class="modal-footer">
<button type="button" id="btnCancelChannel" class="btn btn-secondary" data-i18n="btn_cancel">Abbrechen</button>
<button type="submit" class="btn btn-primary" data-i18n="btn_create">Erstellen</button>
</div>
</form>
</div>
</div>
<script src="app.js"></script>
</body>
</html>

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:root {
--bg-page: #0a0e17;
--bg-surface: #121826;
--bg-card: #182032;
--bg-hover: #1e293f;
--border-subtle: #243048;
--border-focus: #38bdf8;
--text-main: #f1f5f9;
--text-muted: #94a3b8;
--text-subtle: #64748b;
--accent-blue: #38bdf8;
--accent-green: #34d399;
--accent-purple: #c084fc;
--accent-danger: #f87171;
--radius-sm: 6px;
--radius-md: 10px;
--radius-lg: 16px;
--font-mono: "JetBrains Mono", monospace;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
background-color: var(--bg-page);
color: var(--text-main);
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
height: 100vh;
display: flex;
flex-direction: column;
overflow: hidden;
}
/* Header */
.app-header {
background-color: var(--bg-surface);
border-bottom: 1px solid var(--border-subtle);
padding: 0.65rem 1.5rem;
display: flex;
justify-content: space-between;
align-items: center;
flex-shrink: 0;
}
.header-left { display: flex; align-items: center; gap: 0.75rem; }
.logo-icon { font-size: 1.4rem; }
.brand-title { font-weight: 700; font-size: 1.15rem; }
.brand-badge {
background-color: rgba(56, 189, 248, 0.15);
color: var(--accent-blue);
border: 1px solid rgba(56, 189, 248, 0.3);
font-size: 0.75rem;
padding: 0.15rem 0.45rem;
border-radius: var(--radius-sm);
font-weight: 600;
}
.header-right { display: flex; align-items: center; gap: 1rem; }
.user-select-box {
display: flex;
align-items: center;
gap: 0.4rem;
font-size: 0.85rem;
color: var(--text-muted);
}
.user-select-box input {
background-color: var(--bg-card);
border: 1px solid var(--border-subtle);
color: var(--text-main);
padding: 0.3rem 0.6rem;
border-radius: var(--radius-sm);
font-size: 0.85rem;
font-weight: 600;
width: 100px;
outline: none;
}
.user-select-box input:focus { border-color: var(--border-focus); }
.lang-switcher {
display: flex;
background-color: var(--bg-card);
border-radius: var(--radius-sm);
overflow: hidden;
border: 1px solid var(--border-subtle);
}
.btn-lang {
background: transparent;
border: none;
color: var(--text-muted);
padding: 0.25rem 0.55rem;
font-size: 0.75rem;
font-weight: 600;
cursor: pointer;
}
.btn-lang.active { background-color: var(--accent-blue); color: #000; }
/* Layout */
.chat-container {
display: flex;
flex: 1;
overflow: hidden;
}
/* Sidebar */
.sidebar-channels {
width: 250px;
background-color: var(--bg-surface);
border-right: 1px solid var(--border-subtle);
display: flex;
flex-direction: column;
padding: 1rem 0.75rem;
overflow-y: auto;
flex-shrink: 0;
}
.sidebar-section-header {
display: flex;
justify-content: space-between;
align-items: center;
padding: 0 0.5rem 0.4rem;
font-size: 0.72rem;
font-weight: 700;
color: var(--text-subtle);
letter-spacing: 0.05em;
}
.btn-add {
background: transparent;
border: none;
color: var(--text-muted);
font-size: 1.1rem;
line-height: 1;
cursor: pointer;
padding: 0 0.2rem;
}
.btn-add:hover { color: var(--text-main); }
.channel-list {
display: flex;
flex-direction: column;
gap: 0.2rem;
}
.channel-item {
display: flex;
align-items: center;
gap: 0.5rem;
padding: 0.5rem 0.75rem;
border-radius: var(--radius-sm);
color: var(--text-muted);
cursor: pointer;
font-size: 0.9rem;
font-weight: 500;
border: none;
background: transparent;
width: 100%;
text-align: left;
transition: all 0.15s ease;
}
.channel-item:hover {
background-color: var(--bg-hover);
color: var(--text-main);
}
.channel-item.active {
background-color: rgba(56, 189, 248, 0.12);
color: var(--accent-blue);
font-weight: 600;
}
.channel-prefix { font-weight: 700; color: var(--text-subtle); }
.channel-item.active .channel-prefix { color: var(--accent-blue); }
.online-users-list {
display: flex;
flex-direction: column;
gap: 0.3rem;
margin-top: 0.3rem;
}
.user-item {
display: flex;
align-items: center;
gap: 0.5rem;
padding: 0.4rem 0.75rem;
border-radius: var(--radius-sm);
font-size: 0.85rem;
color: var(--text-muted);
}
.status-indicator {
width: 8px;
height: 8px;
border-radius: 50%;
background-color: var(--accent-green);
box-shadow: 0 0 6px var(--accent-green);
}
.badge {
background-color: var(--bg-card);
color: var(--accent-blue);
font-size: 0.7rem;
font-weight: 700;
padding: 0.1rem 0.4rem;
border-radius: 10px;
}
/* Chat Main Area */
.chat-main {
flex: 1;
display: flex;
flex-direction: column;
background-color: var(--bg-page);
overflow: hidden;
}
.chat-header {
padding: 0.85rem 1.5rem;
border-bottom: 1px solid var(--border-subtle);
background-color: var(--bg-surface);
display: flex;
justify-content: space-between;
align-items: center;
flex-shrink: 0;
}
.channel-info h2 {
font-size: 1.15rem;
font-weight: 700;
}
.channel-topic {
font-size: 0.8rem;
color: var(--text-muted);
margin-top: 0.15rem;
}
.connection-status {
display: flex;
align-items: center;
gap: 0.4rem;
font-size: 0.75rem;
color: var(--text-muted);
}
.status-dot {
width: 8px;
height: 8px;
border-radius: 50%;
background-color: var(--accent-green);
}
.connection-status.disconnected .status-dot {
background-color: var(--accent-danger);
}
/* Message Stream */
.message-stream {
flex: 1;
padding: 1.25rem 1.5rem;
overflow-y: auto;
display: flex;
flex-direction: column;
gap: 1rem;
}
.message-row {
display: flex;
gap: 0.85rem;
align-items: flex-start;
}
.avatar {
width: 36px;
height: 36px;
border-radius: 50%;
display: flex;
justify-content: center;
align-items: center;
font-size: 0.85rem;
font-weight: 700;
color: #fff;
flex-shrink: 0;
}
.message-content {
display: flex;
flex-direction: column;
gap: 0.2rem;
max-width: 85%;
}
.message-meta {
display: flex;
align-items: baseline;
gap: 0.5rem;
}
.sender-name {
font-weight: 600;
font-size: 0.9rem;
color: var(--text-main);
}
.msg-timestamp {
font-size: 0.72rem;
color: var(--text-subtle);
}
.msg-text {
font-size: 0.92rem;
line-height: 1.45;
color: #e2e8f0;
word-break: break-word;
white-space: pre-wrap;
}
/* Chat Input */
.chat-input-container {
padding: 1rem 1.5rem;
background-color: var(--bg-surface);
border-top: 1px solid var(--border-subtle);
display: flex;
gap: 0.75rem;
flex-shrink: 0;
}
.chat-input-container input {
flex: 1;
background-color: var(--bg-page);
border: 1px solid var(--border-subtle);
border-radius: var(--radius-md);
color: var(--text-main);
padding: 0.75rem 1rem;
font-size: 0.95rem;
outline: none;
}
.chat-input-container input:focus { border-color: var(--border-focus); }
.btn {
border: none;
border-radius: var(--radius-sm);
padding: 0.6rem 1.1rem;
font-weight: 600;
font-size: 0.85rem;
cursor: pointer;
display: inline-flex;
align-items: center;
gap: 0.4rem;
transition: all 0.15s ease;
}
.btn-primary {
background-color: var(--accent-blue);
color: #000;
}
.btn-primary:hover { background-color: #0284c7; color: #fff; }
.btn-secondary {
background-color: var(--bg-card);
border: 1px solid var(--border-subtle);
color: var(--text-main);
}
.btn-secondary:hover { background-color: var(--bg-hover); }
/* Modal */
.modal-overlay {
position: fixed;
inset: 0;
background-color: rgba(0, 0, 0, 0.7);
backdrop-filter: blur(4px);
display: flex;
justify-content: center;
align-items: center;
padding: 1rem;
z-index: 1000;
}
.modal-card {
background-color: var(--bg-surface);
border: 1px solid var(--border-subtle);
border-radius: var(--radius-lg);
width: 100%;
max-width: 480px;
box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
display: flex;
flex-direction: column;
overflow: hidden;
}
.modal-header {
display: flex;
justify-content: space-between;
align-items: center;
padding: 1.25rem 1.5rem;
border-bottom: 1px solid var(--border-subtle);
}
.modal-header h3 { font-size: 1.15rem; font-weight: 700; }
.btn-close {
background: transparent;
border: none;
color: var(--text-subtle);
font-size: 1.5rem;
cursor: pointer;
line-height: 1;
}
.btn-close:hover { color: var(--text-main); }
.modal-body {
padding: 1.5rem;
display: flex;
flex-direction: column;
gap: 1rem;
}
.form-group {
display: flex;
flex-direction: column;
gap: 0.35rem;
}
.form-group label {
font-size: 0.85rem;
color: var(--text-muted);
font-weight: 600;
}
.form-group input {
background-color: var(--bg-page);
border: 1px solid var(--border-subtle);
border-radius: var(--radius-sm);
color: var(--text-main);
padding: 0.6rem 0.75rem;
font-size: 0.9rem;
outline: none;
}
.form-group input:focus { border-color: var(--border-focus); }
.input-with-prefix {
display: flex;
align-items: center;
background-color: var(--bg-page);
border: 1px solid var(--border-subtle);
border-radius: var(--radius-sm);
padding-left: 0.75rem;
}
.input-with-prefix .prefix {
font-weight: 700;
color: var(--accent-blue);
}
.input-with-prefix input {
border: none;
background: transparent;
width: 100%;
}
.modal-footer {
display: flex;
justify-content: flex-end;
gap: 0.75rem;
margin-top: 0.5rem;
}