🔍 Code Extractor

Flask route handler that logs out the current user by clearing their session data and redirecting them to the login page.

Purpose

This function handles user logout functionality in a Flask web application. It clears all session data to terminate the user's authenticated session, displays an informational message to confirm logout, and redirects the user to the login page. This is a standard security practice for web applications to properly terminate user sessions.

Source Code

def logout():
    """Logout user"""
    session.clear()
    flash('You have been logged out', 'info')
    return redirect(url_for('login'))

Return Value

Returns a Flask redirect response object that redirects the user to the 'login' route. The redirect is generated using Flask's url_for() function to dynamically resolve the login route URL.

Dependencies

• flask

Required Imports

from flask import session
from flask import redirect
from flask import url_for
from flask import flash

Usage Example

from flask import Flask, session, redirect, url_for, flash

app = Flask(__name__)
app.secret_key = 'your-secret-key-here'

@app.route('/login')
def login():
    return 'Login Page'

@app.route('/logout')
def logout():
    """Logout user"""
    session.clear()
    flash('You have been logged out', 'info')
    return redirect(url_for('login'))

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

Best Practices

• Always clear the entire session on logout to prevent session fixation attacks
• Use flash messages to provide user feedback about successful logout
• Redirect to login page after logout to prevent access to protected resources
• Ensure Flask secret_key is set to a strong, random value in production
• Consider adding @login_required decorator to protected routes to enforce authentication
• In production, use secure session cookies with httponly and secure flags enabled
• Consider implementing CSRF protection for logout if using POST method instead of GET
• For enhanced security, consider regenerating session IDs on login/logout

Tags

Similar Components

AI-powered semantic similarity - components with related functionality:

• function logout_v1 95.5% similar

  Flask route handler that logs out the current user by clearing their session data and redirecting them to the login page.

  From: /tf/active/vicechatdev/vice_ai/new_app.py

• function logout 92.4% similar

  Flask route handler that logs out the current user by clearing their session and redirecting them to either the login page or index page based on authentication requirements.

  From: /tf/active/vicechatdev/docchat/app.py

• function login_v2 75.0% similar

  Flask route handler that displays the login page and redirects authenticated users to the chat interface.

  From: /tf/active/vicechatdev/vice_ai/app.py

• function login_v3 73.5% similar

  Flask route handler that displays the login page and redirects authenticated users to the document workspace.

  From: /tf/active/vicechatdev/vice_ai/complex_app.py

• function login_v1 73.0% similar

  Flask route handler that manages user authentication by redirecting authenticated users to the index page, initiating Azure SSO login for production, or creating a development session for local testing.

  From: /tf/active/vicechatdev/vice_ai/new_app.py