Terms of Services handling mechanism implemented in Django.

• Multiple terms of services allowed(via slug field -> version number).
• Per user terms of services acceptance.
• Keeping user profile data state after accepting terms of services.
• Activate tos in future date.
• Enable/disable tos using status property in admin.
• Good admin site to manage terms of services.
• Decorator(@terms_checker) to enable terms and services to your site.
• Middleware(TermsMiddleware) to enable terms and services to your site.
• Api (/tos/v1/terms_of_services/) for listing all pending tos.
• Api for accepting all pending tos.
• Redirection to original request after accepting pending tos.
• Works well for both content-type of text/html and application/json requests.
• Enabled redis cache to store user's pending tos list which invalidates every TERMS_CACHE_SECONDS seconds.

Developed using Python 3.7.5

• asgiref==3.2.3
• Django==3.0.2
• django-environ==0.4.5
• django-filter==2.2.0
• django-redis==4.11.0
• djangorestframework==3.11.0
• psycopg2-binary==2.8.4
• pytz==2019.3
• redis==3.3.11
• sqlparse==0.3.0

• Create and paste app.env file to project folder as in manage.py. app.env format :

DEBUG=True
SECRET_KEY=(=fdfs7hp^n=*6jan*%2dfabww1#pud3!9swg&ojq3&uy411
ALLOWED_HOSTS=localhost,127.0.0.1
DATABASE_URL=postgresql:https://user:pass@postgres/butter_tos
REDIS_URL=rediscache:https://redis/1

• docker-compose -f docker-compose.yml -f docker-compose-dev.yml up
• docker-compose exec web python manage.py createsuperuser

• TERMS_PROTECTED_PATH - list of path you want to protect from being checked for pending tos. It uses python's startswith to exclude requested path. Default is []. ['/admin/', '/tos/'] will be added implicitly.

• DEFAULT_TERMS_SLUG - default slug to use when creating tos in admin. Default is "butter-tos".

• TERMS_CACHE_SECONDS - number of seconds to to store user's pending tos. Default is 60.

• Api (/tos/v1/terms_of_services/) for listing all pending tos.
• Post api(/tos/v1/terms_of_services/accept_terms/) for accepting all tos. Post data format :

{
  "tos-1": 5,
  "tos-2": 8
}

• Use decorator(@terms_checker) to any view methods.
• Decorator(@terms_checker) works only for authenticated user.
• Decorator works with only safe methods(get, head, options).
• If there is any pending tos then it sends status code 302, check location header for redirection url(/tos/v1/terms_of_services/?next=/requested_url/?param=any)

class UserProfileViewSet(viewsets.ModelViewSet):

    @terms_checker
    def retrieve(self, request, *args, **kwargs):
        return super().retrieve(request, *args, **kwargs)

    @terms_checker
    def list(self, request, *args, **kwargs):
        return super().list(request, *args, **kwargs)

    @terms_checker
    @action(methods=['get'], detail=False)
    def email_list(self, request):
        ...

• Middleware(TermsMiddleware) works only if django.contrib.auth.middleware.AuthenticationMiddleware is added in MIDDLEWARE
• Middleware(TermsMiddleware) works with only safe methods(get, head, options).
• If there is any pending tos then it sends status code 302, check location header for redirection url(/tos/v1/terms_of_services/?next=/requested_url/?param=any)
• To use Middleware add apps.tos.middleware.TermsMiddleware to settings MIDDLEWARE list. It should be added after django.contrib.auth.middleware.AuthenticationMiddleware and before django.middleware.gzip.GZipMiddleware.

• Enter to admin site http:https://127.0.0.1:8000/admin/ and create few terms of services with activation date less than now and status active.
• Hit in browser(text/html) http:https://127.0.0.1:8000/tos/v1/terms_of_services/ - will show page with all pending tos, if you accept then it will redirect you again to pending tos page showing that no more tos to accept.
• Hit in postman(application/json) http:https://127.0.0.1:8000/tos/v1/terms_of_services/pending_terms/ - will show json list of all pending tos.
• Post api for accepting all tos : http:https://127.0.0.1:8000/tos/v1/terms_of_services/accept_terms/
  Post data format :

{
  "tos-1": 5,
  "tos-2": 8
}

• Need to write tests extensively.
• Write openapi swagger for testing api.