Decorator for role requirement in Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the decorator function.

Flask

from functools import [1]

Drag options to blanks, or click blank then click option'

Arequest

Bredirect

Cwraps

Dsession

Attempts:

3 left

💡 Hint

Common Mistakes

Importing 'request' or 'redirect' instead of 'wraps'.

Forgetting to import 'wraps' causes decorator metadata loss.

The wraps function from functools is used to preserve the original function's metadata when creating decorators.

2fill in blank

medium

Complete the decorator definition to accept a role parameter.

Flask

def role_required([1]):
    def decorator(func):
        @wraps(func)
        def wrapper(*args, **kwargs):
            # role check logic here
            return func(*args, **kwargs)
        return wrapper
    return decorator

Drag options to blanks, or click blank then click option'

Arole

Bfunc

Cuser

Dpermission

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'func' as parameter instead of 'role'.

Not accepting any parameter in the outer function.

The decorator needs to accept a role parameter to check user roles.

3fill in blank

hard

Fix the error in accessing the current user's roles from Flask's session.

Flask

from flask import session

@role_required('admin')
def admin_panel():
    if 'admin' in session.get([1], []):
        return 'Welcome admin'
    return 'Access denied'

Drag options to blanks, or click blank then click option'

A'roles'

B'permissions'

C'user'

D'user_roles'

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong session key like 'user_roles' or 'permissions'.

Forgetting to provide a default empty list in get.

The roles are commonly stored in the session under the key 'roles'.

4fill in blank

hard

Fill both blanks to complete the role check and redirect unauthorized users.

Flask

from flask import redirect, url_for

def role_required(role):
    def decorator(func):
        @wraps(func)
        def wrapper(*args, **kwargs):
            if role not in session.get([1], []):
                return redirect(url_for([2]))
            return func(*args, **kwargs)
        return wrapper
    return decorator

Drag options to blanks, or click blank then click option'

A'roles'

B'user_roles'

C'login'

D'home'

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong session keys or redirecting to the wrong page.

Not returning the redirect response.

The session key for roles is 'roles'. Unauthorized users should be redirected to the login page.

5fill in blank

hard

Fill all three blanks to create a complete role-required decorator with session check and redirect.

Flask

from functools import wraps
from flask import session, redirect, url_for

def role_required([1]):
    def decorator(func):
        @wraps(func)
        def wrapper(*args, **kwargs):
            if [2] not in session.get([3], []):
                return redirect(url_for('login'))
            return func(*args, **kwargs)
        return wrapper
    return decorator

Drag options to blanks, or click blank then click option'

Arole

C'roles'

D'user_roles'

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names for the role parameter and check.

Using wrong session keys like 'user_roles'.

The decorator takes role as parameter. The check uses role and the session key 'roles'.