Answers for "customize page according to permissions django"

django authenticate with email

from django.contrib.auth import get_user_model
from django.contrib.auth.backends import ModelBackend

class EmailBackend(ModelBackend):
    def authenticate(self, request, username=None, password=None, **kwargs):
        UserModel = get_user_model()
        try:
            user = UserModel.objects.get(email=username)
        except UserModel.DoesNotExist:
            return None
        else:
            if user.check_password(password):
                return user
        return None

django user permission check

# all your import goes here for Models.py
...

# Adding Permissions to a Model.
class BlogPost(models.Model):
  ... # model fields
  class Meta:
    permissions = [('can_write_blog', 'Can Write Blog')]
    

# Checking permissions in Views.py
if request.user.has_perm('app_name.can_write_blog'):
  # give access to blog post form
else:
  # restrict user from access the page.