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Flask route handler for the root URL ('/') that redirects authenticated users to the document workspace and unauthenticated users to the login page.

Purpose

Serves as the entry point/landing page for the Flask web application. It performs authentication checking and routes users to the appropriate page based on their authentication status. This is a common pattern in web applications to protect resources and provide a seamless user experience by automatically directing users to the correct destination.

Source Code

def index():
    """Main page"""
    if is_authenticated():
        return redirect(url_for('document_workspace'))
    return redirect(url_for('login'))

Return Value

Returns a Flask redirect response object. If the user is authenticated (is_authenticated() returns True), redirects to the 'document_workspace' route. If not authenticated, redirects to the 'login' route. The redirect uses Flask's url_for() function to generate URLs dynamically based on route names.

Dependencies

• flask

Required Imports

from flask import redirect
from flask import url_for

Usage Example

from flask import Flask, redirect, url_for, session

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

def is_authenticated():
    return 'user_id' in session

@app.route('/')
def index():
    """Main page"""
    if is_authenticated():
        return redirect(url_for('document_workspace'))
    return redirect(url_for('login'))

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

@app.route('/document_workspace')
def document_workspace():
    return 'Document Workspace'

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

Best Practices

• Ensure is_authenticated() function is properly implemented and handles edge cases (expired sessions, invalid tokens, etc.)
• The function relies on external route definitions ('document_workspace' and 'login') - ensure these routes exist before deploying
• Consider adding error handling for cases where url_for() might fail if routes are not defined
• This pattern should be used consistently across the application for protected routes
• Consider implementing rate limiting or CSRF protection for authentication-related routes
• Ensure Flask session configuration is secure (secure cookies, httponly flags) when using session-based authentication
• The function has no explicit error handling - consider wrapping in try-except if is_authenticated() might raise exceptions

Tags

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