api: add maintainer notes for patches and covers

Comments with an empty msgid will be considered maintainer notes.
- Only able to create through the API
- Only one maintainer note per patch/cover
- Maintainers can edit other notes

Signed-off-by: Victor Accarini <victor.accarini@profusion.mobi>

Author: victor-accarini

docs/api/schemas/patchwork.j2

@@ -1834,7 +1834,6 @@ components:
           title: Message ID
           type: string
           readOnly: true
-          minLength: 1
           maxLength: 255
 {% if version >= (1, 2) %}
         list_archive_url:
@@ -1867,6 +1866,9 @@ components:
         content:
           title: Content
           type: string
+{% if version <= (1, 4) %}
+          readOnly: true
+{% endif %}
           readOnly: true
           minLength: 1
         headers:

patchwork/api/base.py

@@ -3,6 +3,7 @@
 #
 # SPDX-License-Identifier: GPL-2.0-or-later
 
+from django.urls import resolve
 import rest_framework
 
 from django.conf import settings
@@ -15,37 +16,78 @@
 from rest_framework.utils.urls import replace_query_param
 
 from patchwork.api import utils
+from patchwork.models import Cover
+from patchwork.models import Patch
 
 
 DRF_VERSION = tuple(int(x) for x in rest_framework.__version__.split('.'))
 
 
 if DRF_VERSION > (3, 11):
 
+    class CurrentPersonDefault(object):
+        requires_context = True
+
+        def __call__(self, serializer_field):
+            return (
+                serializer_field.context['request']
+                .user.person_set.all()
+                .first()
+            )
+
     class CurrentPatchDefault(object):
         requires_context = True
 
         def __call__(self, serializer_field):
+            req = serializer_field.context['request']
+            _, _, kwargs = resolve(req.path)
+            if 'patch_id' in kwargs:
+                return get_object_or_404(Patch, id=kwargs['patch_id'])
             return serializer_field.context['request'].patch
 
     class CurrentCoverDefault(object):
         requires_context = True
 
         def __call__(self, serializer_field):
-            return serializer_field.context['request'].cover
+            req = serializer_field.context['request']
+            _, _, kwargs = resolve(req.path)
+            if 'cover_id' in kwargs:
+                return get_object_or_404(Cover, id=kwargs['cover_id'])
+            return req.cover
 
 else:
 
+    class CurrentPersonDefault(object):
+        def set_context(self, serializer_field):
+            self.person = (
+                serializer_field.context['request']
+                .user.person_set.all()
+                .first()
+            )
+
+        def __call__(self):
+            return self.person
+
     class CurrentPatchDefault(object):
         def set_context(self, serializer_field):
-            self.patch = serializer_field.context['request'].patch
+            req = serializer_field.context['request']
+            _, _, kwargs = resolve(req.path)
+            if 'patch_id' in kwargs:
+                self.patch = get_object_or_404(Patch, id=kwargs['patch_id'])
+            else:
+                self.patch = req.patch
 
         def __call__(self):
             return self.patch
 
     class CurrentCoverDefault(object):
         def set_context(self, serializer_field):
-            self.patch = serializer_field.context['request'].cover
+            req = serializer_field.context['request']
+            _, _, kwargs = resolve(req.path)
+            if 'cover_id' in kwargs:
+                self.cover = get_object_or_404(Cover, id=kwargs['cover_id'])
+            else:
+                self.cover = req.cover
 
         def __call__(self):
             return self.cover