Password change and reset in Django - Step-by-Step Execution

Concept Flow - Password change and reset

User requests password change/reset

↓

System sends email with token link

↓

User clicks link and opens reset form

↓

User enters new password

↓

System validates token and password

↓

Password updated in database

↓

User notified of success

↓

END

This flow shows how Django handles password change and reset by sending a token link, validating it, and updating the password.

Execution Sample

Django

from django.contrib.auth.views import PasswordResetView
from django.urls import path

urlpatterns = [
  path('reset/', PasswordResetView.as_view(), name='password_reset'),
]

This code sets up a URL route to start the password reset process by sending an email with a reset link.

Execution Table

Step	Action	Input/State	Output/Result
1	User requests password reset	User enters email	System checks if email exists
2	System sends reset email	Valid email found	Email sent with token link
3	User clicks reset link	Token in URL	System shows password reset form
4	User submits new password	New password entered	System validates token and password
5	System updates password	Valid token and password	Password changed in database
6	System confirms success	Password updated	User sees success message
7	Process ends	Password reset complete	User can now login with new password

💡 Process ends after password is successfully updated and user is notified.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 4	After Step 5	Final
email_entered	None	[e-mail]	[e-mail]	[e-mail]	[e-mail]	[e-mail]
token_valid	False	False	False	True	True	True
password_new	None	None	None	new_password123	new_password123	new_password123
password_updated	False	False	False	False	True	True

Key Moments - 3 Insights

Why does the system send an email before showing the reset form?

The email contains a secure token link to verify the user's identity before allowing password reset, as shown in steps 2 and 3 of the execution_table.

What happens if the token is invalid or expired?

The system will not update the password and will show an error, preventing unauthorized changes. This is implied in step 4 where token validation occurs.

Why do we track the 'password_updated' variable?

It confirms the password was successfully changed in the database, marking the process completion as seen in step 5 and 6.

Visual Quiz - 3 Questions

Look at the execution_table, what is the system's action at step 3?

A System sends reset email

B User clicks reset link and system shows reset form

C User submits new password

D System updates password

💡 Hint

Check the 'Action' column for step 3 in the execution_table.

At which step does the system validate the token and new password?

A Step 4

B Step 3

C Step 2

D Step 5

💡 Hint

Look for 'validates token and password' in the 'Action' column.

If the token was invalid, which variable in variable_tracker would remain False?

A password_new

B email_entered

C token_valid

D password_updated

💡 Hint

Refer to the 'token_valid' row in variable_tracker to see its value changes.

Concept Snapshot

Django password reset flow:
1. User requests reset by email.
2. System sends email with token link.
3. User clicks link, opens reset form.
4. User enters new password.
5. System validates token and updates password.
6. User notified of success.

Full Transcript

This visual execution shows how Django handles password change and reset. First, the user requests a password reset by entering their email. The system checks if the email exists and sends a reset email with a secure token link. When the user clicks the link, the system shows a password reset form. The user enters a new password, and the system validates the token and password. If valid, the password is updated in the database, and the user is notified of success. Variables like email_entered, token_valid, password_new, and password_updated track the process state. Key moments include why the email is sent first, token validation importance, and confirming password update. The quizzes test understanding of each step and variable state.

Practice

1. Which built-in Django view is used to start the password reset process by asking the user for their email?

easy

A. PasswordResetView

B. PasswordChangeView

C. PasswordResetConfirmView

D. PasswordChangeDoneView

Solution

1. Step 1: Understand the password reset flow

   The password reset process begins by asking the user to enter their email to receive a reset link.

2. Step 2: Identify the correct Django view

   PasswordResetView is the built-in view that handles this initial step.

3. Final Answer:

   PasswordResetView -> Option A

4. Quick Check:

   Start reset with PasswordResetView [OK]

Hint: Reset starts with PasswordResetView asking for email [OK]

Common Mistakes:

• Confusing PasswordChangeView with PasswordResetView
• Using PasswordResetConfirmView too early
• Thinking PasswordChangeDoneView starts the reset

2. Which URL pattern correctly uses Django's built-in view for changing a logged-in user's password?

easy

A. path('password_change/', auth_views.PasswordResetView.as_view(), name='password_change')

B. path('password_reset/', auth_views.PasswordChangeView.as_view(), name='password_reset')

C. path('password_change/', auth_views.PasswordChangeView.as_view(), name='password_change')

D. path('password_reset_confirm/', auth_views.PasswordChangeDoneView.as_view(), name='password_reset_confirm')

Solution

1. Step 1: Match URL path and view for password change

   The URL path for changing password is usually 'password_change/' and uses PasswordChangeView.

2. Step 2: Verify correct view and name

   path('password_change/', auth_views.PasswordChangeView.as_view(), name='password_change') correctly pairs 'password_change/' with PasswordChangeView and the name 'password_change'.

3. Final Answer:

   path('password_change/', auth_views.PasswordChangeView.as_view(), name='password_change') -> Option C

4. Quick Check:

   PasswordChangeView with 'password_change/' path [OK]

Hint: Password change URL uses PasswordChangeView with 'password_change/' [OK]

Common Mistakes:

• Mixing PasswordResetView with password change URL
• Using wrong URL path for the view
• Incorrect name parameter in path

3. What will be the output behavior when a user submits a valid password reset form using Django's PasswordResetView?

medium

A. An email with a reset link is sent to the user's email address.

B. The user's password is immediately changed to a default password.

C. The user is redirected to the login page without any email sent.

D. The password reset form is cleared but no email is sent.

Solution

1. Step 1: Understand PasswordResetView behavior on valid form

   When the form is valid, Django sends an email with a reset link to the user's registered email.

2. Step 2: Confirm what happens after form submission

   The password is not changed immediately; the user must click the link in the email to confirm.

3. Final Answer:

   An email with a reset link is sent to the user's email address. -> Option A

4. Quick Check:

   Valid reset form triggers email sending [OK]

Hint: Valid reset form sends email with link, not immediate change [OK]

Common Mistakes:

• Assuming password changes immediately after form submit
• Thinking user is redirected without email
• Believing form clears but no email is sent

4. You added auth_views.PasswordResetConfirmView.as_view() to your URLs but get a 404 error when visiting the reset link. What is the most likely cause?

medium

A. The password reset email was not sent.

B. You forgot to import auth_views in your urls.py.

C. The user is not logged in.

D. The URL pattern is missing the required uidb64 and token parameters.

Solution

1. Step 1: Check URL pattern requirements for PasswordResetConfirmView

   This view requires URL parameters uidb64 and token to identify the user and validate the reset link.

2. Step 2: Understand 404 cause

   If these parameters are missing in the URL pattern, Django cannot match the URL, causing a 404 error.

3. Final Answer:

   The URL pattern is missing the required uidb64 and token parameters. -> Option D

4. Quick Check:

   Missing uidb64/token in URL causes 404 [OK]

Hint: Reset confirm URL must include uidb64 and token [OK]

Common Mistakes:

• Ignoring required URL parameters for reset confirm
• Assuming import errors cause 404
• Thinking user login status affects reset link access

5. You want to customize the password reset email template to include the user's first name and a custom message. Which approach correctly achieves this in Django?

hard

A. Add the user's first name directly in the URL parameters sent in the reset link.

B. Override PasswordResetView and provide a custom email_template_name with context including the user's first name.

C. Change the password_reset_confirm template to include the user's first name.

D. Modify the default Django email backend to add the first name automatically.

Solution

1. Step 1: Identify how to customize password reset email

   Django allows specifying a custom email template via email_template_name in PasswordResetView.

2. Step 2: Pass extra context to the email template

   Override PasswordResetView to add context data like the user's first name for use in the email template.

3. Final Answer:

   Override PasswordResetView and provide a custom email_template_name with context including the user's first name. -> Option B

4. Quick Check:

   Customize email by overriding PasswordResetView with context [OK]

Hint: Override PasswordResetView with custom email template and context [OK]

Common Mistakes:

• Trying to customize password_reset_confirm template for email content
• Modifying email backend instead of templates
• Passing user data in URL parameters insecurely