[PATCH 5/5] REST: Add '/bundle' endpoint

[Stephen Finucane]

I had initially resisted adding a '/bundle' endpoint to the API as I
wanted to kill this feature in favour of series. However, series are not
a like-for-like replacement for bundles. Among other things, series do
not provide the composability of bundles: bundles can be manually
created, meaning you can use bundles to group not only multiple patches
but also multiple series (or at least the patches in those series).

Seeing as we're not getting rid of this feature, we should expose it via
the API. Bundles are little unusual, in that they can be public or
private, thus, we should only show bundles that are public or belonging
to the currently authenticated user, if any. For now, this is a
read-only endpoint. We may well allow creation of bundles via the API
once we figure out how to do this cleanly.

Signed-off-by: Stephen Finucane <stephen at that.guru>
Cc: Andy Doan <andy.doan at linaro.org>
---
 patchwork/api/bundle.py  | 80 ++++++++++++++++++++++++++++++++++++++++++++++++
 patchwork/api/filters.py |  8 +++++
 patchwork/urls.py        |  7 +++++
 3 files changed, 95 insertions(+)
 create mode 100644 patchwork/api/bundle.py

diff --git a/patchwork/api/bundle.py b/patchwork/api/bundle.py
new file mode 100644
index 0000000..2b17d05
--- /dev/null
+++ b/patchwork/api/bundle.py
@@ -0,0 +1,80 @@
+# Patchwork - automated patch tracking system
+# Copyright (C) 2017 Stephen Finucane <stephen at that.guru>
+#
+# This file is part of the Patchwork package.
+#
+# Patchwork is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# Patchwork is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Patchwork; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+from django.db.models import Q
+from rest_framework.generics import ListAPIView
+from rest_framework.generics import RetrieveAPIView
+from rest_framework.serializers import HyperlinkedModelSerializer
+from rest_framework.serializers import SerializerMethodField
+
+from patchwork.api.base import PatchworkPermission
+from patchwork.api.filters import BundleFilter
+from patchwork.models import Bundle
+
+
+class BundleSerializer(HyperlinkedModelSerializer):
+
+    mbox = SerializerMethodField()
+
+    def get_mbox(self, instance):
+        request = self.context.get('request')
+        return request.build_absolute_uri(instance.get_mbox_url())
+
+    class Meta:
+        model = Bundle
+        fields = ('id', 'url', 'project', 'name', 'owner', 'patches',
+                  'public', 'mbox')
+        read_only_fields = ('project', 'owner', 'patches', 'mbox')
+        extra_kwargs = {
+            'url': {'view_name': 'api-bundle-detail'},
+            'project': {'view_name': 'api-project-detail'},
+            'owner': {'view_name': 'api-user-detail'},
+            'patches': {'view_name': 'api-patch-detail'},
+        }
+
+
+class BundleMixin(object):
+
+    permission_classes = (PatchworkPermission,)
+    serializer_class = BundleSerializer
+
+    def get_queryset(self):
+        if not self.request.user.is_anonymous:
+            bundle_filter = Q(owner=self.request.user) | Q(public=True)
+        else:
+            bundle_filter = Q(public=True)
+
+        return Bundle.objects\
+            .filter(bundle_filter)\
+            .prefetch_related('patches',)\
+            .select_related('owner', 'project')
+
+
+class BundleList(BundleMixin, ListAPIView):
+    """List bundles."""
+
+    filter_class = BundleFilter
+    search_fields = ('name',)
+    ordering_fields = ('id', 'name', 'owner')
+
+
+class BundleDetail(BundleMixin, RetrieveAPIView):
+    """Show a bundle."""
+
+    pass
diff --git a/patchwork/api/filters.py b/patchwork/api/filters.py
index ecef304..b490185 100644
--- a/patchwork/api/filters.py
+++ b/patchwork/api/filters.py
@@ -20,6 +20,7 @@
 from django_filters import FilterSet
 from django_filters import IsoDateTimeFilter
 
+from patchwork.models import Bundle
 from patchwork.models import Check
 from patchwork.models import CoverLetter
 from patchwork.models import Patch
@@ -60,3 +61,10 @@ class CheckFilter(TimestampMixin, FilterSet):
     class Meta:
         model = Check
         fields = ('user', 'state', 'context')
+
+
+class BundleFilter(FilterSet):
+
+    class Meta:
+        model = Bundle
+        fields = ('project', 'owner', 'public')
diff --git a/patchwork/urls.py b/patchwork/urls.py
index 2b2f5a5..36f96cb 100644
--- a/patchwork/urls.py
+++ b/patchwork/urls.py
@@ -158,6 +158,7 @@ if settings.ENABLE_REST_API:
         raise RuntimeError(
             'djangorestframework must be installed to enable the REST API.')
 
+    from patchwork.api import bundle as api_bundle_views
     from patchwork.api import check as api_check_views
     from patchwork.api import index as api_index_views
     from patchwork.api import cover as api_cover_views
@@ -207,6 +208,12 @@ if settings.ENABLE_REST_API:
         url(r'^series/(?P<pk>[^/]+)/$',
             api_series_views.SeriesDetail.as_view(),
             name='api-series-detail'),
+        url(r'^bundles/$',
+            api_bundle_views.BundleList.as_view(),
+            name='api-bundle-list'),
+        url(r'^bundles/(?P<pk>[^/]+)/$',
+            api_bundle_views.BundleDetail.as_view(),
+            name='api-bundle-detail'),
         url(r'^projects/$',
             api_project_views.ProjectList.as_view(),
             name='api-project-list'),
-- 
2.9.3