Allauth pre social login signal handler to avoid sign up (and verify e-mail) if account exists

signals.py

from allauth.account.utils import perform_login
from allauth.exceptions import ImmediateHttpResponse
from allauth.socialaccount.signals import pre_social_login
from allauth.utils import get_user_model
from django.dispatch import receiver
from django.shortcuts import redirect

from django.conf import settings


@receiver(pre_social_login)
def pre_social_login_handler(request, sociallogin, **kwargs):
    """
    Take email out and try to find user with the same email
    If the user exists, verify email if needed, login and redirect to home
    """
    email_address = sociallogin.account.extra_data["email"]
    user_model = get_user_model()
    users = user_model.objects.filter(email=email_address)
    if users:
        user = users[0]
        # allauth.account.models.EmailAddress
        email_addr_object = user.emailaddress_set.first()
        if not email_addr_object.verified:
            # Verify if needed
            email_addr_object.verified = True
            email_addr_object.save()

        # allauth.account.app_settings.EmailVerificationMethod
        perform_login(request, user, email_verification=settings.ACCOUNT_EMAIL_VERIFICATION)