Fix deprecation warning in Wagtail 5.2

Wagtail 5.2 changes the signature of the register_page_header_buttons
and register_page_listing_more_buttons hooks, causing a deprecation
warning. This commit alters the hook function signature to comply with
both the old and new hook specifications.

Fixes issue 72.

wagtailsharing/tests/test_wagtail_hooks.py

@@ -1,4 +1,4 @@
-from unittest.mock import Mock, patch
+from unittest.mock import patch
 
 from django.conf import settings
 from django.http import HttpResponse
@@ -16,21 +16,20 @@
 class TestAddSharingLink(TestCase):
     def setUp(self):
         self.page = TestPage(title="title", slug="slug")
-        self.page_perms = Mock()
 
     def test_no_link_no_button(self):
         with patch(
             "wagtailsharing.wagtail_hooks.get_sharing_url", return_value=None
         ):
-            links = add_sharing_link(self.page, self.page_perms)
+            links = add_sharing_link(self.page)
             self.assertFalse(list(links))
 
     def test_link_makes_button(self):
         url = "http://test.domain/slug/"
         with patch(
             "wagtailsharing.wagtail_hooks.get_sharing_url", return_value=url
         ):
-            links = add_sharing_link(self.page, self.page_perms)
+            links = add_sharing_link(self.page)
             button = next(links)
             self.assertEqual(button.url, url)
             self.assertIn(

wagtailsharing/wagtail_hooks.py

@@ -27,7 +27,7 @@ class SharingSiteViewSet(SnippetViewSet):
 
 @hooks.register("register_page_header_buttons")
 @hooks.register("register_page_listing_more_buttons")
-def add_sharing_link(page, page_perms, is_parent=False, next_url=None):
+def add_sharing_link(page, **kwargs):
     sharing_url = get_sharing_url(page)
 
     if sharing_url: