How can I efficiently restrict a non-CMS page view to a user group in wagtail with 'permissions_required' hook? - wagtail

Question

I have an app within my wagtail site which uses several pages constructed in views.py (here because they contain complex-ish processing of forms and data and do not need any CMS functionality). One of these views, I want to restrict to users of a specific group.
For other pages, I use a #logon required mixin, which works fine. I can write some code which uses something like def has_group(user, group_name):
return user.groups.filter(name=group_name).exists(), but this seems messy when wagtail has a nice built in permissions model. Therefore, I am trying to use the following hook in wagtail_hook.py:
from django.contrib.auth.models import Permission
from wagtail.core import hooks
#hooks.register('register_permissions')
def view_committee_page():
return Permission.objects.filter(codename="view_committee_page")
This isn't showing up in wagtail admin under group object permissions as I believe it should.
My understanding is only based on the odd example I've found using Wagtail v1.X. The documentation is vague on this specific hook: https://docs.wagtail.io/en/v2.5.1/reference/hooks.html#register-permissions
The only modification I've made to the examples I've seen (eg. here: Wagtail set additional permissions for MyPage ) is to update wagtail.wagtailcore to wagtail.core as per 2.0 release notes.
I know my wagtail_hooks.py file is being picked up correctly as I have another hook in there working as expected.
Am I missing something? Is there a more up to date way to solve this problem?

Answer 1

How about creating your own function with the decorator:
#hooks.register('before_serve_page')
in watail_hooks.py there is a function called check_view_restrictions() so you could do something similar to this?

Answer 2

You would also need to set the permissions on your Page model.
from wagtail.core.models import Page
class MyPage(Page):
class Meta:
permissions = (("page_view_only", "Can view my pages"),)
Then use the hook in wagtail_hooks.py
from django.contrib.auth.models import Permission
from wagtail.core import hooks
#hooks.register('register_permissions')
def page_view_only():
return Permission.objects.filter(codename="page_view_only")
There should be a new permission available in the admin Group settings.