Created
July 14, 2023 12:38
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Flask Application with Database Connection and Authentication
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| 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() |
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| <!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> |
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| <!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> |
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