Categories:
Flutter #106: Tutorial of Firebase Authentication from Scratch

Tutorial of Firebase Authentication from Scratch. Copy and paste the below code as per your requirements.

pubspec.yaml

firebase_auth:
flutter_signin_button:
firebase_core:
google_sign_in:

components/curved-left.dart

import 'package:flutter/material.dart';

class CurvedLeft extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    Size size = MediaQuery.of(context).size;
    return Container(
      child: ClipPath(
        clipper: LeftClipper(),
        child: Container(
          height: 300.0,
          width: size.width,
          decoration: const BoxDecoration(
            gradient: LinearGradient(
              begin: Alignment.topLeft,
              end: Alignment.bottomRight,
              colors: [
                Colors.purpleAccent,
                Colors.lightGreenAccent
              ],
            ),
          ),
        ),
      ),
    );
  }
}

class LeftClipper extends CustomClipper<Path> {
  @override
  Path getClip(Size size) {
    Path path = Path();

    path.lineTo(0, 0);
    path.lineTo(0, size.height);
    path.quadraticBezierTo(30, size.height, 40, size.height - 40);
    path.quadraticBezierTo(80, 80, size.width - 120, 70);
    path.quadraticBezierTo(size.width, 60, size.width, 0);
    path.lineTo(size.width, 0);
    return path;
  }

  @override
  bool shouldReclip(CustomClipper<Path> oldClipper) {
    return false;
  }
}

components/curved-left-shadow.dart

import 'package:flutter/material.dart';

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

  @override
  Widget build(BuildContext context) {
    Size size = MediaQuery.of(context).size;

    return ClipPath(
      clipper: LeftShadowClipper(),
      child: Container(
        height: 320.0,
        width: size.width,
        decoration: const BoxDecoration(
          gradient: LinearGradient(
            begin: Alignment.topLeft,
            end: Alignment.bottomRight,
            colors: [
               Color.fromRGBO(43, 169, 95, 0.3),
               Color.fromRGBO(5, 101, 91, 0.3)
            ],
          ),
        ),
      ),
    );
  }
}

class LeftShadowClipper extends CustomClipper<Path> {
  @override
  Path getClip(Size size) {
    Path path = Path();

    path.lineTo(0, 0);
    path.lineTo(0, size.height - 10);
    path.quadraticBezierTo(35, size.height - 10, 45, size.height - 50);
    path.quadraticBezierTo(90, 90, size.width - 120, 80);
    path.quadraticBezierTo(size.width, 70, size.width, 25);
    path.lineTo(size.width, 0);
    return path;
  }

  @override
  bool shouldReclip(CustomClipper<Path> oldClipper) {
    return false;
  }
}

components/curved-right.dart

import 'package:flutter/material.dart';

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

  @override
  Widget build(BuildContext context) {
    Size size = MediaQuery.of(context).size;

    return ClipPath(
      clipper: RightClipper(),
      child: Container(
        height: 250.0,
        width: size.width,
        decoration: const BoxDecoration(
          gradient:  LinearGradient(
            begin: Alignment.bottomLeft,
            end: Alignment.topRight,
            colors: [
               Color.fromRGBO(86, 1, 251, 1.0),
               Colors.red
            ],
          ),
        ),
      ),
    );
  }
}

class RightClipper extends CustomClipper<Path> {
  @override
  Path getClip(Size size) {
    Path path = Path();

    path.lineTo(35, size.height);
    path.quadraticBezierTo(
      40,
      size.height - 25,
      110,
      size.height - 35,
    );
    path.quadraticBezierTo(
      size.width - 60,
      size.height - 70,
      size.width - 19,
      35,
    );
    path.quadraticBezierTo(
      size.width - 10,
      0,
      size.width,
      0,
    );
    path.lineTo(size.width, size.height);
    path.lineTo(35, size.height);
    return path;
  }

  @override
  bool shouldReclip(CustomClipper<Path> oldClipper) {
    return false;
  }
}

components/curved-right-shadow.dart

import 'package:flutter/material.dart';

class CurvedRightShadow extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    Size size = MediaQuery.of(context).size;
    
    return Container(
      child: ClipPath(
        clipper: RightShadowClipper(),
        child: Container(
          height: 270.0,
          width: size.width,
          decoration: BoxDecoration(
            gradient: LinearGradient(
              begin: Alignment.bottomLeft,
              end: Alignment.topRight,
              colors: [
                Color.fromRGBO(86, 201, 251, 0.3),
                Color.fromRGBO(76, 170, 251, 0.3)
              ],
            ),
          ),
        ),
      ),
    );
  }
}

class RightShadowClipper extends CustomClipper<Path> {
  @override
  Path getClip(Size size) {
    Path path = Path();

    path.lineTo(20, size.height);
    path.quadraticBezierTo(
      40,
      size.height - 35,
      130,
      size.height - 47,
    );
    path.quadraticBezierTo(
      size.width - 60,
      size.height - 90,
      size.width - 25,
      40,
    );
    path.quadraticBezierTo(
      size.width - 10,
      0,
      size.width,
      0,
    );
    path.lineTo(size.width, size.height);
    path.lineTo(20, size.height);
    return path;
  }

  @override
  bool shouldReclip(CustomClipper<Path> oldClipper) {
    return true;
  }
}

start.dart

import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:flutter_signin_button/flutter_signin_button.dart';
import 'package:google_sign_in/google_sign_in.dart';

class Start extends StatefulWidget {
  const Start({Key? key}) : super(key: key);

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

class _StartState extends State<Start> {
  final FirebaseAuth _auth = FirebaseAuth.instance;

  Future<UserCredential> googleSignIn() async {
    GoogleSignIn googleSignIn = GoogleSignIn();
    GoogleSignInAccount? googleUser = await googleSignIn.signIn();
    if (googleUser != null) {
      GoogleSignInAuthentication googleAuth = await googleUser.authentication;

      if (googleAuth.idToken != null && googleAuth.accessToken != null) {
        final AuthCredential credential = GoogleAuthProvider.credential(
            accessToken: googleAuth.accessToken, idToken: googleAuth.idToken);

        final UserCredential user =
            await _auth.signInWithCredential(credential);

        await Navigator.pushReplacementNamed(context, "/");

        return user;
      } else {
        throw StateError('Missing Google Auth Token');
      }
    } else {
      throw StateError('Sign in Aborted');
    }
  }

  navigateToLogin() async {
    Navigator.pushReplacementNamed(context, "Login");
  }

  navigateToRegister() async {
    Navigator.pushReplacementNamed(context, "SignUp");
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        children: <Widget>[
          const SizedBox(height: 35.0),
          const SizedBox(
            height: 400,
            child: Image(
              image: AssetImage("assets/illustration.png"),
              fit: BoxFit.contain,
            ),
          ),
          const SizedBox(height: 20),
          RichText(
              text: const TextSpan(
                  text: 'Welcome to ',
                  style: TextStyle(
                      fontSize: 25.0,
                      fontWeight: FontWeight.bold,
                      color: Colors.black),
                  children: <TextSpan>[
                TextSpan(
                    text: 'Firebase Auth',
                    style: TextStyle(
                        fontSize: 30.0,
                        fontWeight: FontWeight.bold,
                        color: Colors.orange))
              ])),
          const SizedBox(height: 50.0),
          Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              RaisedButton(
                  padding: const EdgeInsets.only(left: 30, right: 30),
                  onPressed: navigateToLogin,
                  child: const Text(
                    'LOGIN',
                    style: TextStyle(
                      fontSize: 20,
                      fontWeight: FontWeight.bold,
                      color: Colors.white,
                    ),
                  ),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(10.0),
                  ),
                  color: Colors.orange),
              const SizedBox(width: 20.0),
              RaisedButton(
                  padding: const EdgeInsets.only(left: 30, right: 30),
                  onPressed: navigateToRegister,
                  child: const Text(
                    'REGISTER',
                    style: TextStyle(
                      fontSize: 20,
                      fontWeight: FontWeight.bold,
                      color: Colors.white,
                    ),
                  ),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(10.0),
                  ),
                  color: Colors.orange),
            ],
          ),
          const SizedBox(height: 20.0),
          SignInButton(Buttons.Google,
              text: "Sign up with Google", onPressed: googleSignIn)
        ],
      ),
    );
  }
}

HomePage.dart

import 'package:example/Start.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
// import 'package:authentification/Start.dart';
import 'package:google_sign_in/google_sign_in.dart';

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  final FirebaseAuth _auth = FirebaseAuth.instance;
  late User user;
  bool isloggedin = false;

  checkAuthentification() async {
    _auth.authStateChanges().listen((user) {
      if (user == null) {
        Navigator.of(context).pushReplacementNamed("start");
      }
    });
  }

  getUser() async {
    User? firebaseUser = _auth.currentUser;
    await firebaseUser?.reload();
    firebaseUser = _auth.currentUser;

    if (firebaseUser != null) {
      setState(() {
        this.user = firebaseUser!;
        this.isloggedin = true;
      });
    }
  }

  signOut() async {
    _auth.signOut();

    final googleSignIn = GoogleSignIn();
    await googleSignIn.signOut();
  }

  @override
  void initState() {
    super.initState();
    this.checkAuthentification();
    this.getUser();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Container(
      child: !isloggedin
          ? CircularProgressIndicator()
          : Column(
              children: <Widget>[
                SizedBox(height: 40.0),
                Container(
                  height: 300,
                  child: Image(
                    image: AssetImage("assets/background.png"),
                    fit: BoxFit.contain,
                  ),
                ),
                Container(
                  child: Text(
                    "Hello ${user.displayName} you are Logged in as ${user.email}",
                    style:
                        TextStyle(fontSize: 20.0, fontWeight: FontWeight.bold),
                  ),
                ),
                RaisedButton(
                  padding: EdgeInsets.fromLTRB(70, 10, 70, 10),
                  onPressed: signOut,
                  child: Text('Signout',
                      style: TextStyle(
                          color: Colors.white,
                          fontSize: 20.0,
                          fontWeight: FontWeight.bold)),
                  color: Colors.orange,
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(20.0),
                  ),
                )
              ],
            ),
    ));
  }
}

SignUp.dart

import 'package:flutter/material.dart';
import 'package:example/components/curved-left-shadow.dart';
import 'package:example/components/curved-left.dart';
import 'package:example/components/curved-right-shadow.dart';
import 'package:example/components/curved-right.dart';
import 'package:firebase_auth/firebase_auth.dart';
class SignUp extends StatefulWidget {
  const SignUp({Key? key}) : super(key: key);

  @override
  _SignUpState createState() => _SignUpState();
}
class _SignUpState extends State<SignUp> {
  final FirebaseAuth _auth = FirebaseAuth.instance;
  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
  late String _name, _email, _password;
  checkAuthentication() async {
    _auth.authStateChanges().listen((user) async {
      if (user != null) {
        Navigator.pushReplacementNamed(context, "/");
      }
    });
  }
  @override
  void initState() {
    super.initState();
    checkAuthentication();
  }
  signUp() async {
    if (_formKey.currentState!.validate()) {
      _formKey.currentState!.save();
      try {
        UserCredential user = await _auth.createUserWithEmailAndPassword(
            email: _email, password: _password);
        if (user != null) {
          await _auth.currentUser!.updateProfile(displayName: _name);
        }
      } catch (e) {
        showError(e.toString());
        print(e);
      }
    }
  }
  showError(String errormessage) {
    showDialog(
        context: context,
        builder: (BuildContext context) {
          return AlertDialog(
            title: const Text('ERROR'),
            content: Text(errormessage),
            actions: <Widget>[
              ElevatedButton(
                  onPressed: () {
                    Navigator.of(context).pop();
                  },
                  child: const Text('OK'))
            ],
          );
        });
  }
  @override
  Widget build(BuildContext context) {
    Size size = MediaQuery.of(context).size;
    return Scaffold(
      body: SingleChildScrollView(
        child: Form(
          key: _formKey,
          child: Stack(
            children: <Widget>[
              Positioned(top: 0, left: 0, child: CurvedLeftShadow()),
              Positioned(top: 0, left: 0, child: CurvedLeft()),
              Positioned(bottom: 0, left: 0, child: CurvedRightShadow()),
              Positioned(bottom: 0, left: 0, child: CurvedRight()),
              SizedBox(
                height: size.height,
                width: size.width,
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.start,
                  children: <Widget>[
                    GestureDetector(
                      onTap: () {
                        Navigator.pushNamed(context, "Login");
                      },
                      child: Container(
                        alignment: Alignment.centerRight,
                        padding: const EdgeInsets.only(
                            right: 30.0,
                            top: 160.0,
                            bottom: 50.0
                        ),
                        child: const Text(
                          "Login",
                          style: TextStyle(
                            fontSize: 25.0,
                            color: Colors.deepOrangeAccent,
                            fontWeight: FontWeight.w700,
                          ),
                        ),
                      ),
                    ),
                    const Padding(
                      padding: EdgeInsets.only(bottom: 55.0),
                      child: Text(
                        "Register",
                        style: TextStyle(fontSize: 37.0, fontWeight: FontWeight.w700),
                      ),
                    ),
                    Stack(
                      children: <Widget>[
                        Container(
                          height: 180.0,
                          padding: const EdgeInsets.only(left: 10.0),
                          margin: const EdgeInsets.only(right: 40.0),
                          decoration: const BoxDecoration(
                            color: Colors.white,
                            boxShadow: [
                              BoxShadow(
                                color: Colors.black26,
                                blurRadius: 20.0,
                              )
                            ],
                            borderRadius: BorderRadius.only(
                              topRight: Radius.circular(90.0),
                              bottomRight: Radius.circular(90.0),
                            ),
                          ),
                          child: Column(
                            mainAxisAlignment: MainAxisAlignment.center,
                            children: <Widget>[
                              TextFormField(
                                  validator: (input) {
                                    if (input!.isEmpty) return 'Enter Name';
                                  },
                                  style: const TextStyle(fontSize: 22.0),
                                  decoration: const InputDecoration(
                                    contentPadding: EdgeInsets.symmetric(
                                      vertical: 15.0,
                                    ),
                                    icon: Icon(
                                      Icons.person_outline,
                                      size: 26.0,
                                    ),
                                    hintText: "Name",
                                    border: InputBorder.none,
                                  ),
                                  onSaved: (input) => _name = input!
                              ),
                              Container(
                                decoration: BoxDecoration(
                                  border: Border.all(
                                    color: Colors.grey,
                                  ),
                                ),
                              ),
                              TextFormField(
                                  validator: (input) {
                                    if (input!.isEmpty) return 'Enter Email';
                                  },
                                  style: const TextStyle(fontSize: 22.0),
                                  decoration: const InputDecoration(
                                    contentPadding: EdgeInsets.symmetric(
                                      vertical: 15.0,
                                    ),
                                    icon: Icon(
                                      Icons.email,
                                      size: 26.0,
                                    ),
                                    hintText: "Email",
                                    border: InputBorder.none,
                                  ),
                                  onSaved: (input) => _email = input!
                              ),
                              Container(
                                decoration: BoxDecoration(
                                  border: Border.all(
                                    color: Colors.grey,
                                  ),
                                ),
                              ),
                              TextFormField(
                                  validator: (input) {
                                    if (input!.length < 6) {
                                      return 'Provide Minimum 6 Character';
                                    }
                                  },
                                  style: const TextStyle(fontSize: 22.0),
                                  decoration: const InputDecoration(
                                    contentPadding: EdgeInsets.symmetric(
                                      vertical: 15.0,
                                    ),
                                    icon: Icon(
                                      Icons.lock_outlined,
                                      size: 26.0,
                                    ),
                                    hintText: "Password",
                                    border: InputBorder.none,
                                  ),
                                  obscureText: true,
                                  onSaved: (input) => _password = input!
                              ),
                            ],
                          ),
                        ),
                        Positioned(
                          top: 55,
                          right: 10,
                          child: GestureDetector(
                            onTap: signUp,
                            child: Container(
                              padding: const EdgeInsets.all(15.0),
                              decoration: const BoxDecoration(
                                shape: BoxShape.circle,
                                gradient: LinearGradient(
                                  begin: Alignment.centerLeft,
                                  end: Alignment.centerRight,
                                  colors: [
                                    Color.fromRGBO(94, 201, 202, 1.0),
                                    Color.fromRGBO(119, 235, 159, 1.0),
                                  ],
                                ),
                                boxShadow: [
                                  BoxShadow(
                                    color: Colors.black26,
                                    blurRadius: 10.0,
                                  )
                                ],
                              ),
                              child: const Icon(
                                Icons.check,
                                size: 40.0,
                                color: Colors.white,
                              ),
                            ),
                          )
                        ),
                      ],
                    ),
                  ],
                ),
              ),
            ],
          ),
        ),
      )
    );
  }
}

Login.dart

import 'package:flutter/material.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'SignUp.dart';
import 'components/curved-left-shadow.dart';
import 'components/curved-left.dart';
import 'components/curved-right-shadow.dart';
import 'components/curved-right.dart';

class Login extends StatefulWidget {
  @override
  _LoginState createState() => _LoginState();
}

class _LoginState extends State<Login> {
  final FirebaseAuth _auth = FirebaseAuth.instance;
  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();

  late String _email, _password;

  checkAuthentification() async {
    _auth.authStateChanges().listen((user) {
      if (user != null) {
        print(user);

        Navigator.pushReplacementNamed(context, "/");
      }
    });
  }

  @override
  void initState() {
    super.initState();
    this.checkAuthentification();
  }

  login() async {
    if (_formKey.currentState!.validate()) {
      _formKey.currentState!.save();

      try {
        await _auth.signInWithEmailAndPassword(
            email: _email, password: _password);
      } catch (e) {
        showError(e.toString());
        print(e);
      }
    }
  }

  showError(String errormessage) {
    showDialog(
        context: context,
        builder: (BuildContext context) {
          return AlertDialog(
            title: const Text('ERROR'),
            content: Text(errormessage),
            actions: <Widget>[
              FlatButton(
                  onPressed: () {
                    Navigator.of(context).pop();
                  },
                  child: const Text('OK'))
            ],
          );
        });
  }

  navigateToSignUp() async {
    Navigator.push(context, MaterialPageRoute(builder: (context) => SignUp()));
  }

  @override
  @override
  Widget build(BuildContext context) {
    Size size = MediaQuery.of(context).size;
    return Scaffold(
      body: Container(
        child: Stack(
          children: <Widget>[
            Positioned(top: 0, left: 0, child: CurvedLeftShadow()),
            Positioned(top: 0, left: 0, child: CurvedLeft()),
            Positioned(bottom: 0, left: 0, child: CurvedRightShadow()),
            Positioned(bottom: 0, left: 0, child: CurvedRight()),
            Form(
              key: _formKey,
              child: Container(
                height: size.height,
                width: size.width,
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    const Padding(
                      padding: EdgeInsets.only(bottom: 50.0),
                      child: Text(
                        "Login",
                        style: TextStyle(fontSize: 37.0, fontWeight: FontWeight.w700),
                      ),
                    ),
                    Stack(
                      children: <Widget>[
                        Container(
                          height: 150.0,
                          padding: const EdgeInsets.only(left: 10.0),
                          margin: const EdgeInsets.only(right: 40.0),
                          decoration: const BoxDecoration(
                            color: Colors.white,
                            boxShadow: [
                              BoxShadow(
                                color: Colors.black26,
                                blurRadius: 20.0,
                              )
                            ],
                            borderRadius: BorderRadius.only(
                              topRight: Radius.circular(90.0),
                              bottomRight: Radius.circular(90.0),
                            ),
                          ),
                          child: Column(
                            mainAxisAlignment: MainAxisAlignment.center,
                            children: <Widget>[
                              TextFormField(
                                validator: (input) {
                                  if (input!.isEmpty) return 'Enter Email';
                                },
                                style: const TextStyle(fontSize: 22.0),
                                decoration: const InputDecoration(
                                  contentPadding: EdgeInsets.symmetric(
                                    vertical: 15.0,
                                  ),
                                  icon: Icon(
                                    Icons.person_outline,
                                    size: 26.0,
                                  ),
                                  hintText: "Email",
                                  border: InputBorder.none,
                                ),
                                onSaved: (input) => _email = input!,
                              ),
                              Container(
                                decoration: BoxDecoration(
                                  border: Border.all(
                                    color: Colors.grey,
                                  ),
                                ),
                              ),
                              TextFormField(
                                validator: (input) {
                                  if (input!.length < 6)
                                    return 'Provide Minimum 6 Character';
                                },
                                style: const TextStyle(fontSize: 22.0),
                                decoration: const InputDecoration(
                                  contentPadding: EdgeInsets.symmetric(
                                    vertical: 15.0,
                                  ),
                                  icon: Icon(
                                    Icons.lock_outline,
                                    size: 26.0,
                                  ),
                                  hintText: "Password",
                                  border: InputBorder.none,
                                ),
                                obscureText: true,
                                onSaved: (input) => _password = input!,
                              ),
                            ],
                          ),
                        ),
                        Positioned(
                          top: 40,
                          right: 10,
                          child: Container(
                            padding: const EdgeInsets.all(15.0),
                            decoration: const BoxDecoration(
                              shape: BoxShape.circle,
                              gradient: LinearGradient(
                                begin: Alignment.centerLeft,
                                end: Alignment.centerRight,
                                colors: [
                                  Color.fromRGBO(94, 201, 202, 1.0),
                                  Color.fromRGBO(119, 235, 159, 1.0),
                                ],
                              ),
                              boxShadow: [
                                BoxShadow(
                                  color: Colors.black26,
                                  blurRadius: 10.0,
                                )
                              ],
                            ),
                            child: IconButton(
                              icon:const Icon(Icons.arrow_forward),
                              iconSize: 40.0,
                              color: Colors.white,
                              onPressed: login,
                            ),
                          ),
                        ),
                      ],
                    ),
                    Container(
                      alignment: Alignment.centerLeft,
                      padding: const EdgeInsets.only(
                        left: 25.0,
                        top: 30.0,
                      ),
                      child: GestureDetector(
                        onTap: () {
                          Navigator.pushNamed(context, "SignUp");
                        },
                        child: const Text(
                          "Register",
                          style: TextStyle(
                            fontSize: 25.0,
                            color: Colors.deepOrangeAccent,
                            fontWeight: FontWeight.w700,
                          ),
                        ),
                      ),
                    ),
                  ],
                ),
              ),
            )
          ],
        ),
      ),
    );
  }
}

main.dart

import 'package:example/Login.dart';
import 'package:example/SignUp.dart';
import 'package:example/Start.dart';
import 'package:flutter/material.dart';
import 'HomePage.dart';
import 'package:firebase_core/firebase_core.dart';
void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
   runApp(const MyApp());
   }
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primaryColor: Colors.orange
      ),
      debugShowCheckedModeBanner: false,
      home:
      HomePage(),
      routes: <String,WidgetBuilder>{
        "Login" : (BuildContext context)=>Login(),
        "SignUp":(BuildContext context)=>const SignUp(),
        "start":(BuildContext context)=>const Start(),
      },

    );
  }

}

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