I am going to create an individual chat with admin with each logged users, I have no idea right now. Flutter (Thanks in advance)

Question

this is my main dart, sending data to firebise

`import 'package:flutter/material.dart';
    import 'package:my_chat/screens/welcome_screen.dart';
    import 'package:my_chat/screens/login_screen.dart';
    import 'package:my_chat/screens/registration_screen.dart';
    import 'package:my_chat/screens/chat_screen.dart';
    import 'package:firebase_core/firebase_core.dart';
    
    void main() async {
      WidgetsFlutterBinding.ensureInitialized();
      await Firebase.initializeApp();
      runApp(FlashChat());
    }

here i want to add route to adminpage

    class FlashChat extends StatelessWidget {
      @override
      Widget build(BuildContext context) {
        return MaterialApp(
          initialRoute: WelcomeScreen.id,
          routes: {
            WelcomeScreen.id: (context) => WelcomeScreen(),
            LoginScreen.id: (context) => LoginScreen(),
            RegistrationScreen.id: (context) => RegistrationScreen(),
            ChatScreen.id: (context) => ChatScreen(),
          },
        );
      }
    }`

this is my login screen, in this screen i want to login as admin and chat with users one to one

import 'package:flutter/material.dart';
import 'package:my_chat/components/rounded_button.dart';
import 'package:my_chat/constants.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:my_chat/screens/chat_screen.dart';
import 'package:modal_progress_hud_nsn/modal_progress_hud_nsn.dart';

class LoginScreen extends StatefulWidget {
  static const String id = 'login_screen';
  @override
  _LoginScreenState createState() => _LoginScreenState();
}

class _LoginScreenState extends State {
  final _auth = FirebaseAuth.instance;
  bool showSpinner = false;
  late String email;
  late String password;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      body: ModalProgressHUD(
        inAsyncCall: showSpinner,
        child: Padding(
          padding: EdgeInsets.symmetric(horizontal: 24.0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              Flexible(
                child: Hero(
                  tag: 'logo',
                  child: Container(
                    height: 200.0,
                    child: Image.asset('images/logo.png'),
                  ),
                ),
              ),
              SizedBox(
                height: 48.0,
              ),
              TextField(
                keyboardType: TextInputType.emailAddress,
                textAlign: TextAlign.center,
                onChanged: (value) {
                  email = value;
                },
                decoration:
                    kTextFieldDecoration.copyWith(hintText: 'Enter your email'),
              ),
              SizedBox(
                height: 8.0,
              ),
              TextField(
                obscureText: true,
                textAlign: TextAlign.center,
                onChanged: (value) {
                  password = value;
                },
                decoration: kTextFieldDecoration.copyWith(
                    hintText: 'Enter your Password'),
              ),
              SizedBox(
                height: 24.0,
              ),
              Flexible(
                child: RoundedButton(
                  text: 'Log In',
                  onPressed: () async {
                    try {
                      setState(() {
                        showSpinner = true;
                      });
                      final user = await _auth.signInWithEmailAndPassword(
                          email: email, password: password);
                      if (user != null) {
                        Navigator.pushNamed(context, ChatScreen.id);
                      }
                      setState(() {
                        showSpinner = false;
                      });
                    } catch (e) {
                      print(e);
                    }
                  },
                  color: Colors.lightBlueAccent,
                ),
              )
            ],
          ),
        ),
      ),
    );
  }
}

this is my welcome screen

import 'package:flutter/material.dart';
import 'package:my_chat/screens/login_screen.dart';
import 'package:my_chat/screens/registration_screen.dart';
import 'package:animated_text_kit/animated_text_kit.dart';
import 'package:my_chat/components/rounded_button.dart';

class WelcomeScreen extends StatefulWidget {
  static const String id = 'welcome_screen';
  @override
  _WelcomeScreenState createState() => _WelcomeScreenState();
}

class _WelcomeScreenState extends State
    with SingleTickerProviderStateMixin {
  late AnimationController controller;
  late Animation animation;
  @override
  void initState() {
    super.initState();
    controller = AnimationController(
      vsync: this,
      duration: Duration(seconds: 1),
    );
    animation = ColorTween(begin: Colors.blueGrey, end: Colors.white)
        .animate(controller);
    controller.forward();
    controller.addListener(() {
      setState(() {});
    });
  }

  @override
  void dispose() {
    controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: animation.value,
      body: Padding(
        padding: EdgeInsets.symmetric(horizontal: 24.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            Row(
              children: [
                Flexible(
                  child: Hero(
                    tag: 'logo',
                    child: Container(
                      child: Image.asset('images/logo.png'),
                      height: 60.0,
                    ),
                  ),
                ),
                DefaultTextStyle(
                  style: TextStyle(
                    fontSize: 45.0,
                    fontWeight: FontWeight.w900,
                    color: Colors.black45,
                  ),
                  child: AnimatedTextKit(
                    animatedTexts: [TypewriterAnimatedText('Flash Chat')],
                  ),
                ),
              ],
            ),
            SizedBox(
              height: 48.0,
            ),
            RoundedButton(
                color: Colors.lightBlueAccent,
                text: 'Log In',
                onPressed: () {
                  Navigator.pushNamed(context, LoginScreen.id);
                }),
            RoundedButton(
              color: Colors.blueAccent,
              text: 'Register',
              onPressed: () {
                Navigator.pushNamed(context, RegistrationScreen.id);
              },
            ),
          ],
        ),
      ),
    );
  }
}

this is my chat screen, here I want to chat only with admin, users should chat with admin only

import 'package:flutter/material.dart';
import 'package:my_chat/constants.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

final _fireStore = FirebaseFirestore.instance;
late User loggedInUser;

class ChatScreen extends StatefulWidget {
  static const String id = 'chat_screen';
  @override
  _ChatScreenState createState() => _ChatScreenState();
}

class _ChatScreenState extends State {
  final messageTextController = TextEditingController();
  final _auth = FirebaseAuth.instance;

  late String messageText;

  @override
  void initState() {
    super.initState();
    getCurrentUser();
  }

  void getCurrentUser() async {
    try {
      final user = await _auth.currentUser;
      if (user != null) {
        loggedInUser = user;
      }
    } catch (e) {
      print(e);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: null,
        actions: [
          IconButton(
              icon: Icon(Icons.close),
              onPressed: () {
                _auth.signOut();
                Navigator.pop(context);
              }),
        ],
        title: Text('⚡️Chat'),
        backgroundColor: Colors.lightBlueAccent,
      ),
      body: SafeArea(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            MessagesStream(),
            Container(
              decoration: kMessageContainerDecoration,
              child: Row(
                crossAxisAlignment: CrossAxisAlignment.center,
                children: [
                  Expanded(
                    child: TextField(
                      controller: messageTextController,
                      onChanged: (value) {
                        messageText = value;
                      },
                      decoration: kMessageTextFieldDecoration,
                    ),
                  ),
                  TextButton(
                    onPressed: () {
                      messageTextController.clear();
                      _fireStore.collection('messages').add({
                        'text': messageText,
                        'sender': loggedInUser.email,
                        'timestamp': FieldValue.serverTimestamp(),
                      });
                    },
                    child: Text(
                      'Send',
                      style: kSendButtonTextStyle,
                    ),
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}

class MessagesStream extends StatelessWidget {
  const MessagesStream({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return StreamBuilder(
      stream: _fireStore
          .collection('messages')
          .orderBy('timestamp', descending: false)
          .snapshots(),
      builder: (context, snapshot) {
        if (!snapshot.hasData) {
          return Center(
            child: CircularProgressIndicator(
              backgroundColor: Colors.lightBlueAccent,
            ),
          );
        }
        final messages = (snapshot.data! as QuerySnapshot).docs.reversed;
        List messageBubbles = [];
        for (var message in messages) {
          final messageText = message.get('text');
          final messageSender = message.get('sender');
          final currentUser = loggedInUser.email;
          final messageBubble = MessageBubble(
            sender: messageSender,
            text: messageText,
            isMe: currentUser == messageSender,
          );
          messageBubbles.add(messageBubble);
        }
        return Expanded(
          child: ListView(
            reverse: true,
            padding: EdgeInsets.symmetric(horizontal: 10.0, vertical: 20.0),
            children: messageBubbles,
          ),
        );
      },
    );
  }
}

class MessageBubble extends StatelessWidget {
  const MessageBubble({
    Key? key,
    required this.sender,
    required this.text,
    this.isMe,
  }) : super(key: key);
  final String sender;
  final String text;
  final bool? isMe;
  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: EdgeInsets.all(10.0),
      child: Column(
        crossAxisAlignment:
            isMe == true ? CrossAxisAlignment.end : CrossAxisAlignment.start,
        children: [
          Text(
            sender,
            style: TextStyle(
              fontSize: 12.0,
              color: Colors.black54,
            ),
          ),
          Material(
            borderRadius: isMe == true
                ? BorderRadius.only(
                    topLeft: Radius.circular(30.0),
                    bottomLeft: Radius.circular(30.0),
                    bottomRight: Radius.circular(30.0))
                : BorderRadius.only(
                    topRight: Radius.circular(30.0),
                    bottomLeft: Radius.circular(30.0),
                    bottomRight: Radius.circular(30.0)),
            elevation: 5.0,
            color: isMe == true ? Colors.lightBlueAccent : Colors.white,
            child: Padding(
              padding: EdgeInsets.symmetric(
                vertical: 10.0,
                horizontal: 20.0,
              ),
              child: Text(
                text,
                style: TextStyle(
                  color: isMe == true ? Colors.white : Colors.black54,
                  fontSize: 15.0,
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}

If someone has any idea, please help me, full code source is https://github.com/Daulenazar/Chat-with-admin

Rafael Zasas · Answer

Stack overflow is generally used to get answers to specific questions, and less for general design/architecture advice.

With that being said, here are some resources to help you:

Jeff Delaney (Google Developer Expert) has a youtube channel called Fireship which discusses various tools and how to use them. He also has a flutter firebase course on his website.
The Flutter and Firebase teams have examples for how to use Firestore in FLutter on their website
Firebase has the ability to lock down the database to allow CRUD operations for specific users with Custom Claims. See the docs Here.

Lastly, from my own perspective it sounds like you want to create a role based authentication chat app. You can save permissions for different users on the user document.

For example, a non admin user can have a Document like this

Firestore Collection: users/

{
 email: 'joe@soap.com',
 permissions: {
  admin: false
   }
}

And your own document:

users/

{
 email: 'Daulet@someDomain.com',
 permissions: {
  admin: true
   }
}

In the UI you can read the logged in users document from firestore and only show certain pages or allow certain actions if the logged in user has the permissions.admin property set to true.

There are many ways to go about this but I recommend checking out the Firebase Docs and Youtube tutorials.

I am going to create an individual chat with admin with each logged users, I have no idea right now. Flutter (Thanks in advance)

1 Answers