How do I implement authentication in a Flask application?

How do I implement authentication in a Flask application?

To implement authentication in Flask, you can use Flask-Login along with Flask-SQLAlchemy for user management.

What are the steps to set up Flask-Login?

First, install Flask-Login, then create a User model, set up login views, and configure the login manager.

Can you show me a code example for user login?

Sure! Here's a simple example:

from flask import Flask, render_template, redirect, url_for, request
from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user

app = Flask(__name__)
app.secret_key = 'your_secret_key'
login_manager = LoginManager()
login_manager.init_app(app)

class User(UserMixin):
    # User model implementation

@login_manager.user_loader
def load_user(user_id):
    return User.get(user_id)

@app.route('/login', methods=['GET', 'POST'])
@login_required
def login():
    # Login logic

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

What about password hashing?

You can use the werkzeug.security module to hash passwords. Use generate_password_hash to hash and check_password_hash to verify.