test_app.py

from flask import Flask, render_template, redirect, url_for, request, flash, jsonify
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user
from flask_bcrypt import Bcrypt

app = Flask(__name__)
app.config['SECRET_KEY'] = 'your_secret_key'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///users.db'
db = SQLAlchemy(app)
login_manager = LoginManager(app)
bcrypt = Bcrypt(app)

# User model
class User(UserMixin, db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(150), unique=True, nullable=False)
    password_hash = db.Column(db.String(150), nullable=False)

# Load user
@login_manager.user_loader
def load_user(user_id):
    return User.query.get(int(user_id))

@app.before_first_request
def create_tables():
    db.create_all()

@app.route('/')
def home():
    return render_template('home.html')

@app.route('/register', methods=['GET', 'POST'])
def register():
    if request.method == 'POST':
        username = request.form['username']
        password = request.form['password']
        hashed_password = bcrypt.generate_password_hash(password).decode('utf-8')
        new_user = User(username=username, password_hash=hashed_password)
        db.session.add(new_user)
        db.session.commit()
        flash('Registration successful!')
        return redirect(url_for('login'))
    return render_template('register.html')

@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 bcrypt.check_password_hash(user.password_hash, password):
            login_user(user)
            return redirect(url_for('dashboard'))
        flash('Login failed. Check your credentials.')
    return render_template('login.html')

@app.route('/dashboard')
@login_required
def dashboard():
    return f'Welcome, {current_user.username}! <a href="/logout">Logout</a>'

@app.route('/logout')
@login_required
def logout():
    logout_user()
    return redirect(url_for('home'))

if __name__ == '__main__':
    app.run(debug=True)