abhishek-shukla21/app.py

## app.py
from flask import Flask, render_template, request, redirect, session
from flask_sqlalchemy import SQLAlchemy
from werkzeug.security import generate_password_hash, check_password_hash

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'your_database_uri_here'  # Replace with your database URI
app.config['SECRET_KEY'] = 'your_secret_key_here'  # Replace with your secret key
db = SQLAlchemy(app)


class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False)
    password = db.Column(db.String(120), nullable=False)

    def __init__(self, username, password):
        self.username = username
        self.password = password


@app.route('/')
def home():
    if 'username' in session:
        return f'Hello, {session["username"]}! You are logged in.'
    return 'Home Page'


@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        username = request.form['username']
        password = request.form['password']
        user = User.query.filter_by(username=username).first()
        if user and check_password_hash(user.password, password):
            session['username'] = username
            return redirect('/')
        else:
            return 'Invalid username or password'
    return render_template('login.html')


@app.route('/register', methods=['GET', 'POST'])
def register():
    if request.method == 'POST':
        username = request.form['username']
        password = request.form['password']
        hashed_password = generate_password_hash(password)
        user = User(username=username, password=hashed_password)
        db.session.add(user)
        db.session.commit()
        return redirect('/login')
    return render_template('register.html')


@app.route('/logout')
def logout():
    session.pop('username', None)
    return redirect('/')


if __name__ == '__main__':
    db.create_all()
    app.run()

## login.html
<!DOCTYPE html>
<html>
<head>
    <title>Login</title>
</head>
<body>
    <h1>Login</h1>
    <form action="/login" method="post">
        <label for="username">Username:</label>
        <input type="text" id="username" name="username" required><br><br>
        <label for="password">Password:</label>
        <input type="password" id="password" name="password" required><br><br>
        <input type="submit" value="Login">
    </form>
    <p>Don't have an account? <a href="/register">Register here</a></p>
</body>
</html>

## register.html
<!DOCTYPE html>
<html>
<head>
    <title>Register</title>
</head>
<body>
    <h1>Register</h1>
    <form action="/register" method="post">
        <label for="username">Username:</label>
        <input type="text" id="username" name="username" required><br><br>
        <label for="password">Password:</label>
        <input type="password" id="password" name="password" required><br><br>
        <input type="submit" value="Register">
    </form>
    <p>Already have an account? <a href="/login">Login here</a></p>
</body>
</html>
	from flask import Flask, render_template, request, redirect, session
	from flask_sqlalchemy import SQLAlchemy
	from werkzeug.security import generate_password_hash, check_password_hash

	app = Flask(__name__)
	app.config['SQLALCHEMY_DATABASE_URI'] = 'your_database_uri_here' # Replace with your database URI
	app.config['SECRET_KEY'] = 'your_secret_key_here' # Replace with your secret key
	db = SQLAlchemy(app)


	class User(db.Model):
	id = db.Column(db.Integer, primary_key=True)
	username = db.Column(db.String(80), unique=True, nullable=False)
	password = db.Column(db.String(120), nullable=False)

	def __init__(self, username, password):
	self.username = username
	self.password = password


	@app.route('/')
	def home():
	if 'username' in session:
	return f'Hello, {session["username"]}! You are logged in.'
	return 'Home Page'


	@app.route('/login', methods=['GET', 'POST'])
	def login():
	if request.method == 'POST':
	username = request.form['username']
	password = request.form['password']
	user = User.query.filter_by(username=username).first()
	if user and check_password_hash(user.password, password):
	session['username'] = username
	return redirect('/')
	else:
	return 'Invalid username or password'
	return render_template('login.html')


	@app.route('/register', methods=['GET', 'POST'])
	def register():
	if request.method == 'POST':
	username = request.form['username']
	password = request.form['password']
	hashed_password = generate_password_hash(password)
	user = User(username=username, password=hashed_password)
	db.session.add(user)
	db.session.commit()
	return redirect('/login')
	return render_template('register.html')


	@app.route('/logout')
	def logout():
	session.pop('username', None)
	return redirect('/')


	if __name__ == '__main__':
	db.create_all()
	app.run()
	<!DOCTYPE html>
	<html>
	<head>
	<title>Login</title>
	</head>
	<body>
	<h1>Login</h1>
	<form action="/login" method="post">
	<label for="username">Username:</label>
	<input type="text" id="username" name="username" required><br><br>
	<label for="password">Password:</label>
	<input type="password" id="password" name="password" required><br><br>
	<input type="submit" value="Login">
	</form>
	<p>Don't have an account? <a href="/register">Register here</a></p>
	</body>
	</html>