drfpasswordless

drfpasswordless is a quick way to integrate ‘passwordless’ auth into your Django Rest Framework project using a user’s email address or mobile number only (herein referred to as an alias).

Built to work with DRF’s own TokenAuthentication system, it sends the user a 6-digit callback token to a given email address or a mobile number. The user sends it back correctly and they’re given an authentication token (again, provided by Django Rest Framework’s TokenAuthentication system).

Callback tokens by default expire after 15 minutes.

Example Usage:

curl -X POST -d “email=[e-mail]” localhost:8000/auth/email/

Email to [e-mail]:

...
<h1>Your login token is 815381.</h1>
...

Return Stage

curl -X POST -d "email=[e-mail]&token=815381" localhost:8000/auth/token/

> HTTP/1.0 200 OK
> {"token":"76be2d9ecfaf5fa4226d722bzdd8a4fff207ed0e”}

Requirements

• Python (3.7+)
• Django (2.2+)
• Django Rest Framework + AuthToken (3.10+)
• Python-Twilio (Optional, for mobile.)

Install

1. Install drfpasswordless

   pipenv install drfpasswordless
   

2. Add Django Rest Framework’s Token Authentication to your Django Rest Framework project.

 REST_FRAMEWORK = {
     'DEFAULT_AUTHENTICATION_CLASSES':
    ('rest_framework.authentication.TokenAuthentication',
 )}

 INSTALLED_APPS = [
     ...
     'rest_framework',
     'rest_framework.authtoken',
     'drfpasswordless',
      ...
 ]

And run

python manage.py migrate

1. Set which types of contact points are allowed for auth in your Settings.py. The available options are EMAIL and MOBILE.

PASSWORDLESS_AUTH = {
   ..
   'PASSWORDLESS_AUTH_TYPES': ['EMAIL', 'MOBILE'],
   ..
}

By default drfpasswordless looks for fields named email or mobile on the User model. If an alias provided doesn’t belong to any given user, a new user is created.

3a. If you’re using email, see the Configuring Email section below.

3b. If you’re using mobile, see the Configuring Mobile section below.

1. Add drfpasswordless.urls to your urls.py

 from django.urls import path, include

 urlpatterns = [
     ..
     path('', include('drfpasswordless.urls')),
     ..
 ]

1. You can now POST to either of the endpoints:

curl -X POST -d "email=[e-mail]" localhost:8000/auth/email/

// OR

curl -X POST -d "mobile=[phone]" localhost:8000/auth/mobile/

A 6 digit callback token will be sent to the contact point.

1. The client has 15 minutes to use the 6 digit callback token correctly. If successful, they get an authorization token in exchange which the client can then use with Django Rest Framework’s TokenAuthentication scheme.

curl -X POST -d "email=[e-mail]&token=815381" localhost:8000/auth/token/

> HTTP/1.0 200 OK
> {"token":"76be2d9ecfaf5fa4226d722bzdd8a4fff207ed0e”}

Configuring Emails

Specify the email address you’d like to send the callback token from with the PASSWORDLESS_EMAIL_NOREPLY_ADDRESS setting.

PASSWORDLESS_AUTH = {
   ..
   'PASSWORDLESS_AUTH_TYPES': ['EMAIL',],
   'PASSWORDLESS_EMAIL_NOREPLY_ADDRESS': '[e-mail]',
   ..
}

You’ll also need to set up an SMTP server to send emails but for development you can set up a dummy development smtp server to test emails. Sent emails will print to the console. Read more here. <https://docs.djangoproject.com/en/3.0/topics/email/#console-backend>__

# Settings.py
EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'

Configuring Mobile

You’ll need to have the python twilio module installed

pipenv install twilio

and set the TWILIO_ACCOUNT_SID and TWILIO_AUTH_TOKEN environment variables. These are read from os.environ, so make sure you don't put them in your settings file accidentally.

You’ll also need to specify the number you send the token from with the PASSWORDLESS_MOBILE_NOREPLY_NUMBER setting.

Templates

If you’d like to use a custom email template for your email callback token, specify your template name with this setting:

PASSWORDLESS_AUTH = {
   ...
  'PASSWORDLESS_EMAIL_TOKEN_HTML_TEMPLATE_NAME': "mytemplate.html"
}

The template renders a single variable {{ callback_token }} which is the 6 digit callback token being sent.

Contact Point Validation

Endpoints can automatically mark themselves as validated when a user logs in with a token sent to a specific endpoint. They can also automatically mark themselves as invalid when a user changes a contact point.

This is off by default but can be turned on with PASSWORDLESS_USER_MARK_EMAIL_VERIFIED or PASSWORDLESS_USER_MARK_MOBILE_VERIFIED. By default when these are enabled they look for the User model fields email_verified or mobile_verified.

You can also use auth/verify/email/ or /auth/verify/mobile/ which will automatically send a token to the endpoint attached to the current request.user's email or mobile if available.

You can then send that token to /auth/verify/ which will double-check that the endpoint belongs to the request.user and mark the alias as verified.

Registration

All unrecognized emails and mobile numbers create new accounts by default. New accounts are automatically set with set_unusable_password() but it’s recommended that admins have some type of password.

This can be turned off with the PASSWORDLESS_REGISTER_NEW_USERS setting.

Other Settings

Here’s a full list of the configurable defaults.

DEFAULTS = {

    # Allowed auth types, can be EMAIL, MOBILE, or both.
    'PASSWORDLESS_AUTH_TYPES': ['EMAIL'],

    # URL Prefix for Authentication Endpoints
    'PASSWORDLESS_AUTH_PREFIX': 'auth/',
    
    #  URL Prefix for Verification Endpoints
    'PASSWORDLESS_VERIFY_PREFIX': 'auth/verify/',

    # Amount of time that tokens last, in seconds
    'PASSWORDLESS_TOKEN_EXPIRE_TIME': 15 * 60,

    # The user's email field name
    'PASSWORDLESS_USER_EMAIL_FIELD_NAME': 'email',

    # The user's mobile field name
    'PASSWORDLESS_USER_MOBILE_FIELD_NAME': 'mobile',

    # Marks itself as verified the first time a user completes auth via token.
    # Automatically unmarks itself if email is changed.
    'PASSWORDLESS_USER_MARK_EMAIL_VERIFIED': False,
    'PASSWORDLESS_USER_EMAIL_VERIFIED_FIELD_NAME': 'email_verified',

    # Marks itself as verified the first time a user completes auth via token.
    # Automatically unmarks itself if mobile number is changed.
    'PASSWORDLESS_USER_MARK_MOBILE_VERIFIED': False,
    'PASSWORDLESS_USER_MOBILE_VERIFIED_FIELD_NAME': 'mobile_verified',

    # The email the callback token is sent from
    'PASSWORDLESS_EMAIL_NOREPLY_ADDRESS': None,

    # The email subject
    'PASSWORDLESS_EMAIL_SUBJECT': "Your Login Token",

    # A plaintext email message overridden by the html message. Takes one string.
    'PASSWORDLESS_EMAIL_PLAINTEXT_MESSAGE': "Enter this token to sign in: %s",

    # The email template name.
    'PASSWORDLESS_EMAIL_TOKEN_HTML_TEMPLATE_NAME': "passwordless_default_token_email.html",

    # Your twilio number that sends the callback tokens.
    'PASSWORDLESS_MOBILE_NOREPLY_NUMBER': None,

    # The message sent to mobile users logging in. Takes one string.
    'PASSWORDLESS_MOBILE_MESSAGE': "Use this code to log in: %s",

    # Registers previously unseen aliases as new users.
    'PASSWORDLESS_REGISTER_NEW_USERS': True,

    # Suppresses actual SMS for testing
    'PASSWORDLESS_TEST_SUPPRESSION': False,

    # Context Processors for Email Template
    'PASSWORDLESS_CONTEXT_PROCESSORS': [],

    # The verification email subject
    'PASSWORDLESS_EMAIL_VERIFICATION_SUBJECT': "Your Verification Token",

    # A plaintext verification email message overridden by the html message. Takes one string.
    'PASSWORDLESS_EMAIL_VERIFICATION_PLAINTEXT_MESSAGE': "Enter this verification code: %s",

    # The verification email template name.
    'PASSWORDLESS_EMAIL_VERIFICATION_TOKEN_HTML_TEMPLATE_NAME': "passwordless_default_verification_token_email.html",

    # The message sent to mobile users logging in. Takes one string.
    'PASSWORDLESS_MOBILE_VERIFICATION_MESSAGE': "Enter this verification code: %s",

    # Automatically send verification email or sms when a user changes their alias.
    'PASSWORDLESS_AUTO_SEND_VERIFICATION_TOKEN': False,

    # What function is called to construct an authentication tokens when
    # exchanging a passwordless token for a real user auth token. This function
    # should take a user and return a tuple of two values. The first value is
    # the token itself, the second is a boolean value representating whether
    # the token was newly created.
    'PASSWORDLESS_AUTH_TOKEN_CREATOR': 'drfpasswordless.utils.create_authentication_token',
    
    # What function is called to construct a serializer for drf tokens when
    # exchanging a passwordless token for a real user auth token.
    'PASSWORDLESS_AUTH_TOKEN_SERIALIZER': 'drfpasswordless.serializers.TokenResponseSerializer',

    # A dictionary of demo user's primary key mapped to their static pin
    'PASSWORDLESS_DEMO_USERS': {},

    # configurable function for sending email
    'PASSWORDLESS_EMAIL_CALLBACK': 'drfpasswordless.utils.send_email_with_callback_token',
    
    # configurable function for sending sms
    'PASSWORDLESS_SMS_CALLBACK': 'drfpasswordless.utils.send_sms_with_callback_token',

    # Token Generation Retry Count
    'PASSWORDLESS_TOKEN_GENERATION_ATTEMPTS': 3


}

To Do

• github.io project page
• Add MkDocs - http://www.mkdocs.org/
• Support non-US mobile numbers
• Custom URLs
• Change bad settings to 500's

Pull requests are encouraged!

Donations & Support

If you found drfpasswordless useful, consider giving me a follow @localghost on Twitter and @hi.aaron on Instagram.

If you'd like to go a step further and are using drfpasswordless in your startup or business, consider a donation:

• BTC: 3FzSFeKVABL5Adh9Egoxh77gHbtg2kcTPk
• ETH: 0x13412a79F06A83B107A8833dB209BECbcb700f24
• Square Cash: $aaron

License

The MIT License (MIT)

Copyright (c) 2020 Aaron Ng

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.