You want to use before_request to check if a user is logged in by verifying a session key. If not logged in, redirect to /login. Which code snippet correctly implements this?
hard📝 Application Q15 of 15
Flask - Middleware and Extensions
You want to use before_request to check if a user is logged in by verifying a session key. If not logged in, redirect to /login. Which code snippet correctly implements this?
Afrom flask import redirect, session
def check_login():
if 'user' not in session:
return redirect('/login')
app.before_request(check_login())
Bfrom flask import redirect, session
@app.before_request
def check_login():
if 'user' not in session:
return redirect('/login')
Cfrom flask import redirect, session
@app.before_request
def check_login():
if session['user'] is None:
return redirect('/login')
from flask import redirect, session
@app.before_request
def check_login():
if 'user' not in session:
return redirect('/login') uses 'user' not in session which safely checks if the user is logged in.
Step 2: Confirm correct decorator and redirect usage
from flask import redirect, session
@app.before_request
def check_login():
if 'user' not in session:
return redirect('/login') uses the @app.before_request decorator and returns a redirect response correctly to stop further processing.
Final Answer:
from flask import redirect, session
@app.before_request
def check_login():
if 'user' not in session:
return redirect('/login') -> Option B
Quick Check:
Use @app.before_request and check 'user' in session = A [OK]
Quick Trick:Use @app.before_request and check session key presence [OK]
Common Mistakes:
MISTAKES
Calling the function instead of decorating
Checking session key with wrong condition
Not returning redirect to stop request
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