Flask-Login module It provides user session management for Flask: logging in, logging out, and remembering session.
The module stores the user ID, restricts views to logged in users, protects cookies and has many other features.
https://flask-login.readthedocs.io/en/latest/
app.py
from flask import Flask, redirect
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user
#ModuleNotFoundError: No module named 'flask_sqlalchemy' = (venv) C:\flaskmyproject>pip install Flask-SQLAlchemy
#ModuleNotFoundError: No module named 'flask_login' = (venv) C:\flaskmyproject>pip install flask_login
#import sqlite3
app = Flask(__name__)
#conn = sqlite3.connect('flask_login.db')
#print("Opened database successfully");
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///flask_login.db'
app.config['SECRET_KEY'] = 'cairocoders-ednalan'
db = SQLAlchemy(app)
login_manager = LoginManager()
login_manager.init_app(app)
class User(UserMixin, db.Model):
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(30), unique=True)
@login_manager.user_loader
def load_user(user_id):
return User.query.get(int(user_id))
@login_manager.unauthorized_handler
def unauthorized_callback():
return redirect('/login')
@app.route('/')
def index():
return 'Public Page'
@app.route('/login')
def login():
user = User.query.filter_by(username='cairocoders').first()
login_user(user)
return 'You are now logged in!'
@app.route('/home')
@login_required
def home():
return 'The current user is ' + current_user.username
@app.route('/profile')
@login_required
def profile():
return 'profile page'
@app.route('/logout')
@login_required
def logout():
logout_user()
return 'You are now logged out!'
if __name__ == '__main__':
app.run(debug=True)
