models/program: link to editor groups

aircox/migrations/0015_program_editors.py

@@ -0,0 +1,25 @@
+# Generated by Django 4.2.5 on 2023-10-18 13:50
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("auth", "0012_alter_user_first_name_max_length"),
+        ("aircox", "0014_alter_schedule_timezone"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="program",
+            name="editors",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                to="auth.group",
+                verbose_name="editors",
+            ),
+        ),
+    ]

aircox/models/program.py

@@ -3,6 +3,8 @@ import os
 import shutil
 
 from django.conf import settings as conf
+from django.contrib.auth.models import Group, Permission
+from django.contrib.contenttypes.models import ContentType
 from django.db import models
 from django.db.models import F
 from django.db.models.functions import Concat, Substr
@@ -58,6 +60,7 @@ class Program(Page):
         default=True,
         help_text=_("update later diffusions according to schedule changes"),
     )
+    editors = models.ForeignKey(Group, models.CASCADE, blank=True, null=True, verbose_name=_("editors"))
 
     objects = ProgramQuerySet.as_manager()
     detail_url_name = "program-detail"
@@ -81,6 +84,14 @@ class Program(Page):
     def excerpts_path(self):
         return os.path.join(self.path, settings.SOUND_ARCHIVES_SUBDIR)
 
+    @property
+    def editors_group_name(self):
+        return f"{self.title} editors"
+
+    @property
+    def change_permission_codename(self):
+        return f"change_program_{self.slug}"
+
     def __init__(self, *kargs, **kwargs):
         super().__init__(*kargs, **kwargs)
         if self.slug:
@@ -110,6 +121,19 @@ class Program(Page):
         os.makedirs(path, exist_ok=True)
         return os.path.exists(path)
 
+    def set_group_ownership(self):
+        editors, created = Group.objects.get_or_create(name=self.editors_group_name)
+        if created:
+            self.editors = editors
+            super().save()
+        permission, _ = Permission.objects.get_or_create(
+            name=f"change program {self.title}",
+            codename=self.change_permission_codename,
+            content_type=ContentType.objects.get_for_model(self),
+        )
+        if permission not in editors.permissions.all():
+            editors.permissions.add(permission)
+
     class Meta:
         verbose_name = _("Program")
         verbose_name_plural = _("Programs")
@@ -135,6 +159,8 @@ class Program(Page):
             shutil.move(abspath, self.abspath)
             Sound.objects.filter(path__startswith=path_).update(file=Concat("file", Substr(F("file"), len(path_))))
 
+        self.set_group_ownership()
+
 
 class ProgramChildQuerySet(PageQuerySet):
     def station(self, station=None, id=None):

aircox/tests/test_permissions.py

@@ -1,4 +1,5 @@
 import pytest
+from django.contrib.auth.models import User, Group
 
 
 @pytest.mark.django_db()
@@ -12,3 +13,13 @@ def test_no_admin(user, client):
 def test_user_cannot_change_program_or_episode(user, client, program):
     assert not user.has_perm("aircox.change_program")
     assert not user.has_perm("aircox.change_episode")
+
+
+@pytest.mark.django_db()
+def test_group_can_change_program(user, client, program):
+    assert program.editors in Group.objects.all()
+    assert not user.has_perm("aircox.%s" % program.change_permission_codename)
+    user.groups.add(program.editors)
+    user = User.objects.get(pk=user.pk)  # reload user in order to have permissions set
+    assert program.editors in user.groups.all()
+    assert user.has_perm("aircox.%s" % program.change_permission_codename)