uni-app | A cross-platform framework using Vue.js | Chat library

let count = page*10

MessageModel.find(find_query).sort({createdAt: 'asc'}).skip(count-10).limit(10).exec();

let count = page*10

const messages = await MessageModel.find(find_query).sort({createdAt: 'desc'}).skip(count-10).limit(10).exec();

const re_messages = messages.reverse()

import 'dart:async';
import 'dart:convert';
import 'dart:io';
import 'dart:math';
import 'package:flutter/material.dart';
import 'package:nearby_connections/nearby_connections.dart';
import 'package:permission_handler/permission_handler.dart';

final String userName = "1";
final Strategy strategy = Strategy.P2P_CLUSTER;

class peerwidget extends StatefulWidget {
  @override
  _peerwidgetState createState() => _peerwidgetState();
}

String mytext = "";

class _peerwidgetState extends State {
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
          title: const Text("Somecrab", textDirection: TextDirection.ltr),
          actions: [
            IconButton(
                icon: const Icon(Icons.settings),
                onPressed: () {
                  print("OPENING SETTINGS FOR BACKGROUND COLOR AND SUCH");
                }),
          ]),
      body: SingleChildScrollView(
        child: Column(children: [
          Container(
            child: Text(mytext),
          ),
          ElevatedButton(
            style: ElevatedButton.styleFrom(
              minimumSize: const Size(140, 50),
            ),
            onPressed: () {
              print("location");
              //setstate oderso, nächsts Bild holle
              locationpermission();
            },
            child: Column(
              // Replace with a Row for horizontal icon + text
              children: const [
                Icon(Icons.arrow_forward),
                Text("Ask location"),
              ],
            ),
          ),
          ElevatedButton(
            style: ElevatedButton.styleFrom(
              minimumSize: const Size(140, 50),
            ),
            onPressed: () {
              print("storage");
              //setstate oderso, nächsts Bild holle
              storagepermission();
            },
            child: Column(
              // Replace with a Row for horizontal icon + text
              children: const [
                Icon(Icons.arrow_forward),
                Text("Ask storage"),
              ],
            ),
          ),
          ElevatedButton(
            style: ElevatedButton.styleFrom(
              minimumSize: const Size(140, 50),
            ),
            onPressed: () {
              print("Kill all");
              //setstate oderso, nächsts Bild holle
              closeall();
            },
            child: Column(
              // Replace with a Row for horizontal icon + text
              children: const [
                Icon(Icons.arrow_forward),
                Text("Kill all"),
              ],
            ),
          ),
          ElevatedButton(
            style: ElevatedButton.styleFrom(
              minimumSize: const Size(140, 50),
            ),
            onPressed: () {
              print("CONNECT");
              //setstate oderso, nächsts Bild holle

              setState(() {
                connect();
              });
            },
            child: Column(
              // Replace with a Row for horizontal icon + text
              children: const [
                Icon(Icons.arrow_forward),
                Text("CONNECT"),
              ],
            ),
          ),
          ElevatedButton(
            style: ElevatedButton.styleFrom(
              minimumSize: const Size(140, 50),
            ),
            onPressed: () {
              print("DISCOVER");
              //setstate oderso, nächsts Bild holle
              setState(() {
                discover();
              });
            },
            child: Column(
              // Replace with a Row for horizontal icon + text
              children: const [
                Icon(Icons.arrow_forward),
                Text("DISCOVER"),
              ],
            ),
          ),
        ]),
      ),
    );
  }
}

onConnectionInitiated() {
  mytext = "onConnectionInitiated";
}

onConnectionResult() {
  mytext = "onConnectionResult";
}

onDisconnected() {
  mytext = "onConnectionDisconnected";
}

onEndpointFound() {
  mytext = "onEndpointFound";
}

onEndpointLost() {
  mytext = "onEndpointLost";
}

connect() async {
  print("connecting started...");
  mytext = "connection started";
  try {
    await Nearby().startAdvertising(
      userName,
      strategy,
      onConnectionInitiated: (String id, ConnectionInfo info) {
        print("connection initiated!" + id + info.toString());

        onConnectionInitiated();
        // Called whenever a discoverer requests connection

        Nearby().acceptConnection(id, onPayLoadRecieved: (endpointId, payload) {
          // called whenever a payload is recieved.
        }, onPayloadTransferUpdate: (endpointId, payloadTransferUpdate) {
          // gives status of a payload
          // e.g success/failure/in_progress
          // bytes transferred and total bytes etc
        });
      },
      onConnectionResult: (String id, Status status) {
        print("connected?");
        onConnectionResult();
        // Called when connection is accepted/rejected
      },
      onDisconnected: (String id) {
        print("disconnected?");
        // Callled whenever a discoverer disconnects from advertiser
        onDisconnected();
      },
      serviceId: "com.simon.fluttershit", // uniquely identifies your app
    );
  } catch (exception) {
    print("insufficient permissions or some error!");
    // platform exceptions like unable to start bluetooth or insufficient permissions
  }
}

discover() async {
  mytext = "discovery started";
  print("Discovery started!");
  try {
    await Nearby().startDiscovery(
      userName,
      strategy,
      onEndpointFound: (String id, String userName, String serviceId) {
        print("found something: " + id + userName + serviceId);
        onEndpointFound();

        // to be called by discover whenever an endpoint is found
// callbacks are similar to those in startAdvertising method
        try {
          Nearby().requestConnection(
            userName,
            id,
            onConnectionInitiated: (id, info) {},
            onConnectionResult: (id, status) {},
            onDisconnected: (id) {},
          );
        } catch (exception) {
          // called if request was invalid
        }
      },
      serviceId: "com.simon.fluttershit",
      onEndpointLost: (String? endpointId) {
        print("was lost" + endpointId.toString());
        onEndpointLost();
      }, // uniquely identifies your app
    );
  } catch (e) {
    print("insufficient permissions or some error!" + e.toString());
    // platform exceptions like unable to start bluetooth or insufficient permissions
  }
}

void locationpermission() {
  Nearby().askLocationPermission();
}

void storagepermission() {
  Nearby().askExternalStoragePermission();
}

void closeall() {
  Nearby().stopAdvertising();
  Nearby().stopDiscovery();
}

//server.js
io.on('connection', (socket) => {
        //...I removed code from here for simplification
        
        socket.on('disconnect', () => {
            socket.broadcast.emit('user-disconnected', users[socket.id]);
            delete users[socket.id];
        })
})

//client.js
//...a lot of code removed from here for simplification
socket.on('user-disconnected', myname =>
        {appendMessage(`${myname} left`)}
)

messages: Message[];
  messageSubscription: Subscription;

  constructor(private messageService: MessageService, private router: Router) { 
    
  }

  ngOnInit(): void {
    this.messageSubscription = this.messageService.messageSubject.subscribe(
      (messages: Message[]) => {
        console.log(messages)
        this.messages = messages;
      }
    );
    this.messageService.getMessage();
    this.messageService.emitMessage();
  }

  ngOnDestroy(): void {
      this.messageSubscription.unsubscribe();
  }

    
    
        
            
{{message.displayName}}
            
{{message.createdAt | date: 'short'}}
        
        
{{message.text}}
    

  messages:Message[] = [];
  messageSubject = new Subject();
  constructor() { }

  emitMessage(){
    this.messageSubject.next(this.messages);
  }

  saveMessage(newMessage: Message){
    firebase.database().ref('/message').push(newMessage);
  }

  getMessage(){
    firebase.database().ref('/message')
      .on('value', (data) => {
        this.messages = data.val() ? Object.values(data.val()): [];
        this.emitMessage();
      });
  }

if not data:
    print(f'User {name1} leave')
    break

server: 

import socket
import threading
import time

HOST = '127.0.0.1'
PORT = 8888

server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.bind((HOST, PORT))

server.listen(15)
print(f'Server {HOST}:{PORT} start.')

users = [] 
sort = []


def crypto(text, key):
    encrypt = ''

    for i in text:
        encrypt += chr(ord(i) + key)

    return encrypt   


def listen_decode(user, addr):
    print(f'User IP-address {addr[0]} login..')
    sort.append(user) 
    user.send('Encode'.encode('utf-8'))
    user.send('Name'.encode('utf-8'))
    name1 = user.recv(1024).decode('utf-8')
    users.append(name1)

    
    while True:
        data = user.recv(1024).decode('utf-8')
        b1 = time.ctime()
        atribute = ' | '
        data_crypto = crypto(data, 4)
        print(f'{name1} sent message: {data_crypto} ' + atribute + '' + b1 + ' ')

        for i in sort:
            if(i != server and i != user):
                i.sendall(f'{name1} > {data}'.encode('utf-8'))
    
        if not data:
            print(f'User {name1} leave')
            break


def start_server():
    
    while True:
       user_socket, addr = server.accept()
       potok_info = threading.Thread(target=listen_decode, args=(user_socket, addr))
       potok_info.start()


if __name__ == '__main__':
    start_server()

from tkinter import messagebox
from tkinter import *
import _tkinter 
import socket
import threading
import os


window = Tk()

window.title('Login')
window.geometry('320x200')
window.resizable(True, True)

HOST = '127.0.0.1'
PORT = 8888

client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client.connect((HOST, PORT))

name = StringVar()
password = StringVar()

def encrypt(text, key):
    encrypt1 = ''

    for i in text:
        encrypt1 += chr(ord(i) - key)

    return encrypt1

def send_message():

    while True:
        data = client.recv(1024)
        print('\r\r' + data.decode('utf-8') + '\n' + f'you: ', end='')


def chat():

    string_name = name.get()

    if('Name' in client.recv(1024).decode('utf-8')):
        name1 = string_name
        client.send(name1.encode('utf-8'))

        potok = threading.Thread(target=send_message)
        potok.start()


        while True:
            msg = input('you: ')
            client.send(msg.encode('utf-8'))



def crypt():     
    
    string_name = name.get()
    string_password = password.get()

    try:
        user_encryption_selection = (encryption_listbox.get(encryption_listbox.curselection()))
    except _tkinter.TclError:
        messagebox.showerror('Error', 'Enter type message')



    if string_name == 'John':
        if string_password == '5555':
            if user_encryption_selection == 'Use Encrypted':
                window.after(1000, lambda: window.destroy())

                menu = Tk()

                menu.title('Menu Chat')
                menu.geometry('500x350')
                menu.resizable(False, False)

                menu_button = Button(menu, text='Global chat', command=chat, height=1, width=18)
                menu_button.grid(padx=150)

                menu.mainloop()
        else:
            messagebox.showerror('Error', 'Error password')
    else:
        messagebox.showerror('Error', 'Error name')

    
entry = Entry(window, textvariable=name, width=10)
entry.grid(column=1, pady=7, padx=4)

label = Label(window, text='Enter name: ')
label.grid(row=0, padx=1)

entry1 = Entry(window, textvariable=password, width=10)
entry1.grid(column=1, pady=7, padx=2)

label1 = Label(window, text='Enter password: ')
label1.grid(row=1, padx=1)

listbox = Listbox(window, selectmode=SINGLE, width=12, height=2)
listbox.grid(column=1, row=2, pady=7, padx=2)



encryption_options = ['Use Encrypted']
encryption_listbox = Listbox(window, selectmode=SINGLE, width=10, height=1)
encryption_listbox.grid(column=1, row=2, pady=7, padx=2)
for i in encryption_options:
    encryption_listbox.insert(END, i)  

label_crypto = Label(window, text='Type message: ', bg='black', fg='red')
label_crypto.grid(row=2)

button = Button(window, text='Enter', command=crypt)
button.grid(pady=30)



window.mainloop()

let last = null;

// Execute the first query saving the last doc
const ref = db
 .collection('chat')
 .orderBy('timestamp')
 .limit(10)
 .onSnapshot(({docs}) => {
    last = docs[docs.length - 1]
   // my logic
 })

// When needed I'll execute the second query starting from the last doc
// of the previous query
const ref = db
 .collection('chat')
 .orderBy('timestamp')
 .limit(10)
 .startAfter(last)
 .onSnapshot(({docs}) => {
    last = docs[docs.length - 1]
    // my logic
 })

[ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9] // original docs from the first query
[10,11,12,13,14,15,16,17,18,19] // original docs from the second query

[ 0, 1, 2, 3, 4, 5, 6, 7, 8, 10] // updated docs from the first query
[10,11,12,13,14,15,16,17,18,19] // original docs from the second query

import threading
import socket

HOST = '127.0.0.1'
PORT = 8888

server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.bind((HOST, PORT))

server.listen(15)
print(f'Server {HOST}:{PORT} start.')

users = []

def send_all(data):
    for user in users:
        user.send(data)

def listen_user(user):
    print('Listening user')
    
    while True:
        data = user.recv(1024)
        print(f'User sent {data}')

        send_all(data)

def start_server():
    while True:
        user_socket, addr = server.accept()
        users.append(user_socket)

        potok_info = threading.Thread(target=listen_user, args=(user_socket,))
        potok_info.start()


if __name__ == '__main__':
    start_server()

import socket
import time
import threading
import os

HOST = '127.0.0.1'
PORT = 8888

client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client.connect((HOST, PORT))


def send_message():
    print('Enter name: ')
    name = input()
    while True:
        data = client.recv(1024)
        print(data.decode('utf-8'))
        msg = (f'{name} send message {data}')
        client.send(msg.encode('utf-8')) # this
        
        
def send_server():
    
    listen_thread = threading.Thread(target=send_message)
    listen_thread.start()

    while True:
        client.send(input('you: ').encode('utf-8'))

        

if __name__ == '__main__':
    os.system('clear')
    print('***** Welcome in Security Chat. *****')
    send_server()

import 'dart:ffi';
import 'package:bardsf/components/card_data.dart';
import 'package:bardsf/screens/admin/admin_chat.dart';

import 'package:bardsf/screens/main_screens/qr_screen.dart';

import 'package:bardsf/screens/workouts/workout_selector.dart';
import 'package:flutter/material.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:bardsf/components/reusable_cards.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import '../chat/chat_selector_screen.dart';
import 'package:bardsf/screens/chat/chat_screen.dart';
import 'package:intl/intl.dart';


late String messageText;
class HomePageScreen extends StatefulWidget {
  static const String id = 'home_page_screen';


  @override
  _HomePageScreenState createState() => _HomePageScreenState();
}

class _HomePageScreenState extends State {
  final messageTextController = TextEditingController();
  final _firestore = FirebaseFirestore.instance;

  final _auth = FirebaseAuth.instance;
  late User loggedInUser;

  static const TextStyle optionStyle = TextStyle(
      fontSize: 30, fontWeight: FontWeight.bold);
  @override
  void initState() {

    super.initState();
    getCurrentUser();
  }
  void getCurrentUser() async {
    try {
      final user = await _auth.currentUser;
      if (user != null) {
        loggedInUser = user;
        print(loggedInUser.email);
      }
    } catch (e) {
      print (e);
    }
  }
  void messagesStream() async {
    await for (var snapshot in _firestore.collection('messages').orderBy(
        'timestamp').snapshots()) {
      for (var message in snapshot.docs) {
        
        print(message.data().cast());
      }
    }
  }


  @override
  Widget build(BuildContext context) {
    return Container(

      child: Container(
        decoration: BoxDecoration(
            image: DecorationImage(
              image: AssetImage("images/bar1.jpg"), fit: BoxFit.fill,
            )
        ),
        child: Scaffold(
          backgroundColor: Colors.white.withOpacity(0.5),


          body: SafeArea(


            child: Column(

                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  ReusableCard(
                    colour: Colors.white,
                    cardChild: CardData(
                      label: 'The Bar',
                      labeltwo: 'Member Access 24/7', icon: IconData(10),
                    ), onPress: () {},
                  ),
                  StreamBuilder(

                    stream: _firestore.collection('messages').snapshots(),
                    builder: (context, snapshot) {
                      List messageBubbles = [];
                      if (!snapshot.hasData) {
                        return Center(
                          child: CircularProgressIndicator(
                            backgroundColor: Colors.lightBlueAccent,
                          ),
                        );
                      }
                      final messages = snapshot.data!.docs;

                      for (var message in messages) {
                        final messageText = message['text'];
                        final messageSender = message['sender'];

                        final currentUser = loggedInUser.email;


                        final messageBubble = MessageBubble(
                          sender: 'The Bar Gym',
                          text: messageText,
                          isMe: currentUser == messageSender,
                          daterTimer: DateTime.now().millisecondsSinceEpoch,

                        );

                        messageBubbles.add(messageBubble);
                      }


                      return Expanded(

                        child: Padding(
                          padding: const EdgeInsets.all(40.0),
                          child: Container(
                            color: Colors.white.withOpacity(0.6),
                            child: ListView(

                              reverse: false,
                              padding: EdgeInsets.symmetric(
                                  horizontal: 10, vertical: 10),
                              children: messageBubbles,
                            ),
                          ),
                        ),
                      );
                    },


                  ),


                ]
            ),
          ),

        ),
      ),

    );
  }
}

class MessageBubble extends StatelessWidget {


  MessageBubble({required this.sender,required this.text,required this.isMe, required this.daterTimer });

  final String sender;
  final String text;
  final bool isMe;
  final int daterTimer;

  String readTimestamp(int timestamp) {
    var now = new DateTime.now();
    var format = new DateFormat('M/d' ' ' 'K:m'' ''a');
    var date = DateTime.fromMillisecondsSinceEpoch(timestamp);
    var diff = date.difference(now);
    var time = '';


    if (diff.inSeconds <= 0 || diff.inSeconds > 0 && diff.inMinutes == 0 || diff.inMinutes > 0 && diff.inHours == 0 || diff.inHours > 0 && diff.inDays == 0) {
      time = format.format(date);
    } else {
      if (diff.inDays == 1) {
        time = (diff.inDays/360).toString() + 'DAY AGO';
      } else {
        time = (diff.inDays/360).toString() + 'DAYS AGO';
      }
    }

    return time;
  }


  @override

  Widget build(BuildContext context) {
    return  Padding(
      padding: EdgeInsets.all(10.0),
      child: Column(
        crossAxisAlignment: isMe ? CrossAxisAlignment.stretch : CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Expanded(
                child: Text(sender,
                  style: TextStyle(
                    fontSize: 12.0,
                    color: Colors.red,
                  ),
                ),
              ),
              Expanded(child: Text('${readTimestamp(daterTimer)}',
                style: TextStyle(color: Colors.black)
              ),
              ),
            ],
          ),
          Material(
            // borderRadius: isMe ? BorderRadius.only(topLeft: Radius.circular(30.0),
            //   bottomLeft: Radius.circular(30.0),
            //   bottomRight: Radius.circular(30.0),
            //   topRight: Radius.circular(30.0)
            // ) : BorderRadius.only(topRight: Radius.circular(30.0),
            //   bottomLeft: Radius.circular(30.0),
            //   bottomRight: Radius.circular(30.0),
            //   topLeft: Radius.circular(30.0),
            // ),

            elevation: 5.0,
            color: isMe ? Colors.transparent : Colors.white,
            child: Padding(
              padding: EdgeInsets.symmetric(vertical: 8.0, horizontal: 10.0),
              child: Text('$text',
                style: TextStyle( fontSize: 15.0,
                  fontWeight: FontWeight.bold,
                  color: isMe ? Colors.white : Colors.black,),
              ),

            ),
          ),

        ],
      ),
    );
  }
}