Django-Web3-Auth

django-web3-auth is a pluggable Django app that enables login/signup via an Ethereum wallet (a la CryptoKitties). The user authenticates themselves by digitally signing the session key with their wallet's private key.

Documentation

The full documentation is at https://django-web3-auth.readthedocs.io.

Example project

https://github.com/Bearle/django-web3-auth/tree/master/example

You can check out our example project by cloning the repo and heading into example/ directory. There is a README file for you to check, also.

Features

• Web3 API login, signup
• Web3 Django forms for signup, login
• Checks ethereum address validity
• Uses random token signing as proof of private key posession
• Easy to set up and use (just one click)
• Custom auth backend
• VERY customizable - uses Django settings, allows for custom User model
• Vanilla Javascript helpers included

Quickstart

Install Django-Web3-Auth with pip:

pip install django-web3-auth

Add it to your INSTALLED_APPS:

INSTALLED_APPS = (
    ...
    'web3auth.apps.Web3AuthConfig',
    ...
)

Set 'web3auth.backend.Web3Backend' as your authentication backend:

AUTHENTICATION_BACKENDS = [
'django.contrib.auth.backends.ModelBackend',
'web3auth.backend.Web3Backend'
]

Set your User model's field to use as ETH address provider:

WEB3AUTH_USER_ADDRESS_FIELD = 'username'

And if you have some other fields you want to be in the SignupForm, add them too:

WEB3AUTH_USER_SIGNUP_FIELDS = ['email',]

Add Django-Web3-Auth's URL patterns:

from web3auth import urls as web3auth_urls


urlpatterns = [
    ...
    url(r'^', include(web3auth_urls)),
    ...
]

Add some javascript to handle login:

<script src="{% static 'web3auth/js/web3auth.js' %}"></script>

function startLogin() {
  if (typeof web3 !== 'undefined') {
    checkWeb3(function (loggedIn) {
      if (!loggedIn) {
        alert("Please unlock your web3 provider (probably, Metamask)")
      } else {
        var login_url = '{% url 'web3auth:web3auth_login_api' %}';
        web3Login(login_url, console.log, console.log, console.log, console.log, console.log, function (resp) {
          console.log(resp);
          window.location.replace(resp.redirect_url);
        });
      }
    });

  } else {
    alert('web3 missing');
  }
}

You can access signup using {% url 'web3auth:web3auth_signup' %}.

If you have any questions left, head to the example app https://github.com/Bearle/django-web3-auth/tree/master/example

Important details and FAQ

1. If you set a custom address field (WEB3AUTH_USER_ADDRESS_FIELD), it MUST be unique (unique=True).

This is needed because if it's not, the user can register a new account with the same address as the other one, meaning that the user can now login as any of those accounts (sometimes being the wrong one).

2. How do i deal with user passwords or Password is not set There should be some code in your project that generates a password using User.objects.make_random_password and sends it to a user email. Or, even better, sends them a 'restore password' link. Also, it's possible to copy signup_view to your project, assign it a url, and add the corresponding lines to set some password for a user.

3. Why do i have to sign a message? It's not needed in MyEtherWallet or other DApps!

The main reason is that when using a DApp, you most likely don't have an account on the website, it's accessible only with web3 (Metamask). When using web3 only to sign into user account, it is necessary to prove your identity with a private key (e.g. sign a random message), because when we have backend we can't trust any user just by his knowledge of the public address. Signed message proves that user possesses the private key, associated with the address.

Running Tests

Does the code actually work?

source <YOURVIRTUALENV>/bin/activate
(myenv) $ pip install tox
(myenv) $ tox

Credits

Tools used in rendering this package:

• Cookiecutter
• cookiecutter-djangopackage