app.py

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

app = Flask(__name__, template_folder='Templates')
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///./testdb.db'
app.secret_key = 'SOME KEY'

db = SQLAlchemy(app)
migrate = Migrate(app, db)
bcrypt = Bcrypt(app)
login_manager = LoginManager(app)


class User(db.Model, UserMixin):
    __tablename__ = 'users'
    uid = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String, nullable=False)
    password = db.Column(db.String, nullable=False)
    role = db.Column(db.String)
    description = db.Column(db.String)

    def __repr__(self):
        return f'User : {self.username}, Role : {self.role}'

    def get_id(self):
        return self.uid

# User Loader
@login_manager.user_loader
def load_user(uid):
    return User.query.get(uid)

# Routes
@app.route('/', methods=['GET', 'POST'])
def index():
    return render_template('index.html')

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

@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'GET':
        return render_template('login.html')
    elif request.method == 'POST':
        username = request.form.get('username')
        password = request.form.get('password')
        user = User.query.filter(User.username == username).first()
        if user and bcrypt.check_password_hash(user.password, password):
            login_user(user)
            return render_template('index.html')
        else:
            return 'Login Failed'

@app.route('/logout')
def logout():
    logout_user()
    return render_template('index.html')

# Run App
if __name__ == '__main__':
    app.run(host='0.0.0.0', debug=True)