fix(api): fix trigger order on token CASCADE policy deletion, fixes #995

api/desecapi/migrations/0041_remove_token_token_auto_policy_and_more.py

@@ -0,0 +1,55 @@
+# Generated by Django 5.1.3 on 2024-12-02 10:59
+
+import pgtrigger.compiler
+import pgtrigger.migrations
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("desecapi", "0040_token_auto_policy_token_token_auto_policy_and_more"),
+    ]
+
+    operations = [
+        pgtrigger.migrations.RemoveTrigger(
+            model_name="token",
+            name="token_auto_policy",
+        ),
+        pgtrigger.migrations.RemoveTrigger(
+            model_name="tokendomainpolicy",
+            name="default_policy_when_auto_policy",
+        ),
+        pgtrigger.migrations.AddTrigger(
+            model_name="token",
+            trigger=pgtrigger.compiler.Trigger(
+                name="token_auto_policy",
+                sql=pgtrigger.compiler.UpsertTriggerSql(
+                    constraint="CONSTRAINT",
+                    func="\n                    IF\n                        NEW.auto_policy = true AND NOT EXISTS(\n                            SELECT * FROM desecapi_tokendomainpolicy WHERE token_id = NEW.id AND domain_id IS NULL AND subname IS NULL AND type IS NULL\n                        )\n                    THEN\n                        RAISE EXCEPTION 'Token auto policy without a default policy is not allowed. (token.id=%s)', NEW.id;\n                    END IF;\n                    RETURN NULL;\n                ",
+                    hash="a940f3a622b7ffdb0dbf5e3de88e28932d6d4c6c",
+                    operation='INSERT OR UPDATE OF "auto_policy"',
+                    pgid="pgtrigger_token_auto_policy_8e6d9",
+                    table="desecapi_token",
+                    timing="DEFERRABLE INITIALLY DEFERRED",
+                    when="AFTER",
+                ),
+            ),
+        ),
+        pgtrigger.migrations.AddTrigger(
+            model_name="tokendomainpolicy",
+            trigger=pgtrigger.compiler.Trigger(
+                name="default_policy_when_auto_policy",
+                sql=pgtrigger.compiler.UpsertTriggerSql(
+                    constraint="CONSTRAINT",
+                    func="\n                    IF\n                        OLD.domain_id IS NULL AND OLD.subname IS NULL AND OLD.type IS NULL AND (SELECT auto_policy FROM desecapi_token WHERE id = OLD.token_id) = true\n                    THEN\n                        RAISE EXCEPTION 'Cannot delete default policy while auto_policy is in effect. (tokendomainpolicy.id=%)', OLD.id;\n                    END IF;\n                    RETURN OLD;\n                ",
+                    hash="2e38bd8be24da066472012dac4c30f3818b35ca0",
+                    operation="DELETE",
+                    pgid="pgtrigger_default_policy_when_auto_policy_a1fd2",
+                    table="desecapi_tokendomainpolicy",
+                    timing="DEFERRABLE INITIALLY DEFERRED",
+                    when="AFTER",
+                ),
+            ),
+        ),
+    ]

api/desecapi/models/tokens.py

@@ -65,7 +65,7 @@ class Meta:
             # Ensure that a default policy is defined when auto_policy=true
             pgtrigger.Trigger(
                 name="token_auto_policy",
-                operation=pgtrigger.Update | pgtrigger.Insert,
+                operation=pgtrigger.Insert | pgtrigger.UpdateOf("auto_policy"),
                 when=pgtrigger.After,
                 timing=pgtrigger.Deferred,
                 func=pgtrigger.Func(
@@ -234,13 +234,14 @@ class Meta:
             pgtrigger.Trigger(
                 name="default_policy_when_auto_policy",
                 operation=pgtrigger.Delete,
-                when=pgtrigger.Before,
+                when=pgtrigger.After,
+                timing=pgtrigger.Deferred,
                 func=pgtrigger.Func(
                     """
                     IF
                         OLD.domain_id IS NULL AND OLD.subname IS NULL AND OLD.type IS NULL AND (SELECT auto_policy FROM {fields.token.remote_field.model._meta.db_table} WHERE id = OLD.token_id) = true
                     THEN
-                        RAISE EXCEPTION 'Cannot delete default policy while auto_policy is in effect. (tokendomainpolicy.id=%s)', OLD.id;
+                        RAISE EXCEPTION 'Cannot delete default policy while auto_policy is in effect. (tokendomainpolicy.id=%)', OLD.id;
                     END IF;
                     RETURN OLD;
                 """

api/desecapi/tests/test_token_domain_policy.py

@@ -752,3 +752,15 @@ def test_create_domain(self):
         self.assertTrue(self.token.get_policy(rrset).perm_write)
         rrset = models.RRset(domain=models.Domain.objects.get(name=name_other))
         self.assertFalse(self.token.get_policy(rrset).perm_write)
+
+    def test_delete_domain_with_autopolicy(self):
+        self.token_manage.auto_policy = True
+        self.token_manage.save()
+        connection.check_constraints()  # simulate transaction commit
+
+        response = self.client._request(
+            self.client.delete,
+            self.reverse("v1:token-detail", pk=self.token_manage.id),
+            using=self.token_manage,
+        )
+        self.assertStatus(response, status.HTTP_204_NO_CONTENT)