Django Rest Password Reset

This python package provides a simple password reset strategy for django rest framework, where users can request password reset tokens via their registered e-mail address.

The main idea behind this package is to not make any assumptions about how the token is delivered to the end-user (e-mail, text-message, etc...). Instead, this package provides a signal that can be reacted on (e.g., by sending an e-mail or a text message).

This package basically provides two REST endpoints:

• Request a token
• Verify (confirm) a token (and change the password)

Quickstart

1. Install the package from pypi using pip:

pip install django-rest-passwordreset

2. Add django_rest_passwordreset to your INSTALLED_APPS (after rest_framework) within your Django settings file:

INSTALLED_APPS = (
    ...
    'django.contrib.auth',
    ...
    'rest_framework',
    ...
    'django_rest_passwordreset',
    ...
)

3. This package provides two endpoints, which can be included by including django_rest_passwordreset.urls in your urls.py as follows:

from django.conf.urls import url, include


urlpatterns = [
    ...
    url(r'^api/password_reset/', include('django_rest_passwordreset.urls', namespace='password_reset')),
    ...
]    

Note: You can adapt the url to your needs.

Endpoints

The following endpoints are provided:

• POST ${API_URL}/reset_password/ - request a reset password token by using the email parameter
• POST ${API_URL}/reset_password/confirm/ - using a valid token, the users password is set to the provided password

where ${API_URL}/ is the url specified in your urls.py (e.g., api/password_reset/)

Configuration / Settings

The following settings can be set in Djangos settings.py file:

• DJANGO_REST_MULTITOKENAUTH_RESET_TOKEN_EXPIRY_TIME - time in hours about how long the token is active (Default: 24)

  Please note: expired tokens are automatically cleared based on this setting in every call of ResetPasswordRequestToken.post.

Signals

• reset_password_token_created(sender, instance, reset_password_token) Fired when a reset password token is generated
• pre_password_reset(user) - fired just before a password is being reset
• post_password_reset(user) - fired after a password has been reset

Example for sending an e-mail

1. Create two new django templates: email/user_reset_password.html and email/user_reset_password.txt. Those templates will contain the e-mail message sent to the user, aswell as the password reset link (or token). Within the templates, you can access the following context variables: current_user, username, email, reset_password_url. Feel free to adapt this to your needs.

2. Add the following code, which contains a Django Signal, to your application (see this part of the django documentation for more information on where to put signals).

from django.dispatch import receiver
from django_rest_passwordreset.signals import reset_password_token_created
from django.urls import reverse


@receiver(reset_password_token_created)
def password_reset_token_created(sender, instance, reset_password_token, *args, **kwargs):
    """
    Handles password reset tokens
    When a token is created, an e-mail needs to be sent to the user
    :param sender: View Class that sent the signal
    :param instance: View Instance that sent the signal
    :param reset_password_token: Token Model Object
    :param args:
    :param kwargs:
    :return:
    """
    # send an e-mail to the user
    context = {
        'current_user': reset_password_token.user,
        'username': reset_password_token.user.username,
        'email': reset_password_token.user.email,
        'reset_password_url': "{}?token={}".format(reverse('password_reset:reset-password-request'), reset_password_token.key)
    }

    # render email text
    email_html_message = render_to_string('email/user_reset_password.html', context)
    email_plaintext_message = render_to_string('email/user_reset_password.txt', context)

    msg = EmailMultiAlternatives(
        # title:
        _("Password Reset for {title}".format(title="Some website title")),
        # message:
        email_plaintext_message,
        # from:
        "[email protected]",
        # to:
        [reset_password_token.user.email]
    )
    msg.attach_alternative(email_html_message, "text/html")
    msg.send()

3. You should now be able to use the endpoints to request a password reset token via your e-mail address. If you want to test this locally, I recommend using some kind of fake mailserver (such as maildump).

Custom Token Generator

By default, a random string token of length 10 to 50 is generated using the RandomStringTokenGenerator class. This library offers a possibility to configure the params of RandomStringTokenGenerator as well as switch to another token generator, e.g. RandomNumberTokenGenerator. You can also generate your own token generator class.

You can change that by adding

DJANGO_REST_PASSWORDRESET_TOKEN_CONFIG = {
    "CLASS": ...,
    "OPTIONS": {...}
}

into Django settings.py file.

RandomStringTokenGenerator

This is the default configuration.

DJANGO_REST_PASSWORDRESET_TOKEN_CONFIG = {
    "CLASS": "django_rest_passwordreset.tokens.RandomStringTokenGenerator"
}

You can configure the length as follows:

DJANGO_REST_PASSWORDRESET_TOKEN_CONFIG = {
    "CLASS": "django_rest_passwordreset.tokens.RandomStringTokenGenerator",
    "OPTIONS": {
        "min_length": 20,
        "max_lenght": 30
    }
}

RandomNumberTokenGenerator

DJANGO_REST_PASSWORDRESET_TOKEN_CONFIG = {
    "CLASS": "django_rest_passwordreset.tokens.RandomNumberTokenGenerator"
}

You can configure the minimum and maximum number as follows:

DJANGO_REST_PASSWORDRESET_TOKEN_CONFIG = {
    "CLASS": "django_rest_passwordreset.tokens.RandomNumberTokenGenerator",
    "OPTIONS": {
        "min_number": 1500,
        "max_number": 9999
    }
}

Write your own Token Generator

Please see token_configuration/django_rest_passwordreset/tokens.py for example implementation of number and string token generator.

The basic idea is to create a new class that inherits from BaseTokenGenerator, takes arbitrary arguments (args and kwargs) in the __init__ function as well as implementing a generate_token function.

from django_rest_passwordreset.tokens import BaseTokenGenerator


class RandomStringTokenGenerator(BaseTokenGenerator):
    """
    Generates a random string with min and max length using os.urandom and binascii.hexlify
    """

    def __init__(self, min_length=10, max_length=50, *args, **kwargs):
        self.min_length = min_length
        self.max_length = max_length

    def generate_token(self, *args, **kwargs):
        """ generates a pseudo random code using os.urandom and binascii.hexlify """
        # determine the length based on min_length and max_length
        length = random.randint(self.min_length, self.max_length)

        # generate the token using os.urandom and hexlify
        return binascii.hexlify(
            os.urandom(self.max_length)
        ).decode()[0:length]

Compatibility Matrix

This library should be compatible with the latest Django and Django Rest Framework Versions. For reference, here is a matrix showing the guaranteed and tested compatibility.

django-rest-passwordreset Version	Django Versions	Django Rest Framework Versions
0.9.7	1.8, 1.11, 2.0, 2.1	3.6 - 3.9
1.0 (WIP)	1.11, 2.0, 2.2	3.6 - 3.9

Documentation / Browsable API

This package supports the DRF auto-generated documentation (via coreapi) as well as the DRF browsable API.

Known Issues

Django 2.1 Migrations - Multiple Primary keys for table ...

Django 2.1 introduced a breaking change for migrations (see Django Issue #29790). We therefore had to rewrite the migration 0002_pk_migration.py such that it covers Django versions before (<) 2.1 and later (>=) 2.1.

Some information is written down in Issue #8.

Contributions

This library tries to follow the unix philosophy of "do one thing and do it well" (which is providing a basic password reset endpoint for Django Rest Framework). Contributions are welcome in the form of pull requests and issues! If you create a pull request, please make sure that you are not introducing breaking changes.

Tests

See folder tests/. Basically, all endpoints are covered with multiple unit tests.

Use this code snippet to run tests:

pip install -r requirements_test.txt
python setup.py install
cd tests
python manage.py test