Django allauth with email as username and multiple sites

I am assuming you'd like to allow the same email to be registered separately for each of the sites in your Django setup.

Looking at the allauth code; it appears that it is infeasible to do so at the moment, likely because allauth does not take into account site ID as part of the User signup process.

class AppSettings(object):

    class AuthenticationMethod:
        USERNAME = 'username'
        EMAIL = 'email'
        USERNAME_EMAIL = 'username_email'

    class EmailVerificationMethod:
        # After signing up, keep the user account inactive until the email
        # address is verified
        MANDATORY = 'mandatory'
        # Allow login with unverified e-mail (e-mail verification is
        # still sent)
        OPTIONAL = 'optional'
        # Don't send e-mail verification mails during signup
        NONE = 'none'

    def __init__(self, prefix):
        self.prefix = prefix
        # If login is by email, email must be required
        assert (not self.AUTHENTICATION_METHOD ==
                self.AuthenticationMethod.EMAIL) or self.EMAIL_REQUIRED
        # If login includes email, login must be unique
        assert (self.AUTHENTICATION_METHOD ==
                self.AuthenticationMethod.USERNAME) or self.UNIQUE_EMAIL

One way to do this would be as follows: - Keep allauth AUTHENTICATION_METHOD as Username - Store the site alongside the User information, perhaps in a UserProfile or by overriding the User Model. - Make the combination of Email and Site unique. - Override the LoginView such that the user enters email; you can translate the combination of Email, Site to a Unique User account and username; which you can pass on to allauth to perform login.

Assuming you use the Sites framework; your code would look something like this:

from allauth.account.views import LoginView
from django.core.exceptions import ObjectDoesNotExist


class CustomLoginView(LoginView):

    def get_user():
        email = request.POST.get('email')
        current_site = Site.objects.get_current()
        try:
            user = User.objects.get(email=email, site=current_site)
        except ObjectDoesNotExist:
            pass  # Handle Error: Perhaps redirect to signup 
        return user


    def dispatch(self, request, *args, **kwargs):
        user = self.get_user()
        request.POST = request.POST.copy()
        request.POST['username'] = user.username
        return super(CustomLoginView, self).dispatch(request, *args, **kwargs)

Then monkey-patch the LoginView with the custom login view:

allauth.account.views.LoginView = CustomLoginView

Related Reading on setting up a Site FK, and custom auth backends:

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