Login redirect with user friendly alerts

login.html

{% for message in messages %}
  {# Login redirect alert.#}
  {# We have to display only the last message. Other are irelevant, but must be iterated #}
  {% if 'login_required' in message.tags and forloop.last %}
    <div class="alert alert-info alert-dismissible fade in" role="alert">
      <button type="button" class="close" data-dismiss="alert" aria-label="Close">
        <span aria-hidden="true">×</span>
      </button>
      {{ message }}
    </div>
  {% endif %}
{% endfor %}

mixins.py

'''
This module provides login required mixin for Class-Based Views.
This mixin allows to display a custom message for usser after redirect (in template).
To pass messages between views is used `django.contrib.messages` framework (https://docs.djangoproject.com/en/1.9/ref/contrib/messages/)
'''
from urllib.parse import urlparse
from django.contrib import messages
from django.shortcuts import resolve_url
from django.contrib.auth.views import redirect_to_login
from django.contrib.auth import REDIRECT_FIELD_NAME
from django.conf import settings


class LoginRequiredMixin(object):
    '''
    Simple mixin to redirect unauthenticated users to login page.
    If in subclass `login_alert_message` is overidden it will
    be added to `django.contrib.messages` with tag `login_required`
    and level `django.contrib.messages.INFO`
    '''
    login_alert_message = None
    message_tags = 'login_required'
    message_level = messages.INFO
    # login_alert_message = _('You need to login to view this page.')
    
    def get_login_url(self):
        '''
        Override this to provide differend login url.
        '''
        return settings.LOGIN_URL
    
    def login_redirect(self, request):
        '''
        Performs login redirect. Basically, should return a redirect response.
        Based on `user_passes_test` decorator from django library.
        '''
        path = request.build_absolute_uri()
        resolved_login_url = resolve_url(self.get_login_url())
        login_scheme, login_netloc = urlparse(resolved_login_url)[:2]
        current_scheme, current_netloc = urlparse(path)[:2]
        if ((not login_scheme or login_scheme == current_scheme) and
                (not login_netloc or login_netloc == current_netloc)):
            path = request.get_full_path()
        return redirect_to_login(
            path, resolved_login_url, REDIRECT_FIELD_NAME
            )

    
    def is_authenticated(self, request):
      '''
      Override this if you want to change default behaviour.
      Returns: True/False
      '''
      return request.user.is_authenticated()

    def dispatch(self, request, *args, **kwargs):
        if self.is_authenticated(request):
            return super(LoginRequiredMixin, self).dispatch(request, *args, **kwargs)
        if self.login_alert_message:
            messages.add_message(
                request,
                self.message_level,
                self.login_alert_message,
                extra_tags=self.message_tags,
                fail_silently=True
            )
        return self.login_redirect(request)

views.py

from django.utils.translation import ugettext_lazy as _

from .mixins import LoginRequiredMixin

class ProductDetailsView(LoginRequiredMixin, View):
    login_alert_message = _(
        'You need to login to view more information for this product'
    )
    # other attributes are irelevant


class PersonInfoView(LoginRequiredMixin, View):
    login_alert_message = _(
        'You have to login to access premium info'
    )
    # other attributes are irelevant