Flask-Login Password Reset - flask

Question

I'm using the flask-login library, and I haven't been able to find any good tutorials or documentation on how to go about allowing a user to reset their password through an email. What direction/resources can I look at on how to do this? A thorough google search didn't reveal anything useful.

Answer 1

Base logic:
Create reset password form with email field.
When user submit form then you should:
check this email in database
generate undistinguished crypto random secret key (next just secret key)
store this key, current timestamp and user identifier to cache or database
send it to user email or sms
When user apply secret key (for example with url or special form) you should:
validate it (exist, not expired, not used before)
get user identifier
delete or mark as used current secret key
provide logic to enter/generate new password.
Logic to enter/generate password can be different:
login user and show form to enter new password - one time login key
show form to enter password than login if valid
generate new password and send it to user email
generate new secret key for form to enter new password and send it to user email
generate new secret key to approve form, send it via sms, show form to enter new password and approval secret key then login if valid

Answer 2

flask-login doesn't take care of reset password emails and other such things. Its just there to manage sessions and cookies.
You should use Flask-Security which adds password reset functionality and other common security related features to flask. Flask-Security uses flask-login to handle sessions, but adds other features on top to round out the security features:
Email Confirmation
If desired you can require that new users confirm their email address.
Flask-Security will send an email message to any new users with an
confirmation link. Upon navigating to the confirmation link, the user
will be automatically logged in. There is also view for resending a
confirmation link to a given email if the user happens to try to use
an expired token or has lost the previous email. Confirmation links
can be configured to expire after a specified amount of time.
Password Reset/Recovery
Password reset and recovery is available for when a user forgets his
or her password. Flask-Security sends an email to the user with a link
to a view which they can reset their password. Once the password is
reset they are automatically logged in and can use the new password
from then on. Password reset links can be configured to expire after a
specified amount of time.
User Registration
Flask-Security comes packaged with a basic user registration view.
This view is very simple and new users need only supply an email
address and their password. This view can be overrided[sic] if your
registration process requires more fields.

Answer 3

Flask-Login only provides user session management for Flask. It handles the common tasks of logging in, logging out, and remembering your users’ sessions over extended periods of time. but not reset password, change password, email confirmation etc.
Flask-security was the best and easy option to do these. It pretty much handles everything. but it is not actively maintained.
Note
This project is non maintained anymore. Consider the
Flask-Security-Too project as an alternative. -- From flask-security
Github repo
So i recommend Flask-Security-Too library which is improved version and actively maintained. It also has much more features like 2FA Auth, Unified Sign-In etc
You can install install it using pip
pip install flask-security-too flask-sqlalchemy
and import libraries like
from flask-security import current_user, login_required
There are some complete (but simple) examples available in the examples directory of the Flask-Security repo.
Documentation : https://flask-security-too.readthedocs.io/en/stable/index.html