From: Veronika Kabatova <vkaba...@redhat.com>

Signed-off-by: Veronika Kabatova <vkaba...@redhat.com>
---
 patchwork/api/cover.py                             | 14 ++++++--
 patchwork/api/embedded.py                          | 38 ++++++++++++++++++++++
 patchwork/api/patch.py                             | 15 ++++++---
 patchwork/models.py                                |  3 ++
 .../notes/comments-api-b7dff6ee4ce04c9b.yaml       |  8 +++++
 5 files changed, 70 insertions(+), 8 deletions(-)
 create mode 100644 releasenotes/notes/comments-api-b7dff6ee4ce04c9b.yaml

diff --git a/patchwork/api/cover.py b/patchwork/api/cover.py
index fc7ae97..5a6e377 100644
--- a/patchwork/api/cover.py
+++ b/patchwork/api/cover.py
@@ -25,6 +25,7 @@ from rest_framework.serializers import SerializerMethodField
 
 from patchwork.api.base import BaseHyperlinkedModelSerializer
 from patchwork.api.filters import CoverLetterFilter
+from patchwork.api.embedded import CommentSerializer
 from patchwork.api.embedded import PersonSerializer
 from patchwork.api.embedded import ProjectSerializer
 from patchwork.api.embedded import SeriesSerializer
@@ -58,5 +59,6 @@ class 
CoverLetterListSerializer(BaseHyperlinkedModelSerializer):
 class CoverLetterDetailSerializer(CoverLetterListSerializer):
 
     headers = SerializerMethodField()
+    comments = CommentSerializer(many=True, read_only=True)
 
     def get_headers(self, instance):
@@ -65,9 +67,14 @@ class CoverLetterDetailSerializer(CoverLetterListSerializer):
 
     class Meta:
         model = CoverLetter
-        fields = CoverLetterListSerializer.Meta.fields + ('headers', 'content')
+        fields = CoverLetterListSerializer.Meta.fields + ('headers',
+                                                          'content',
+                                                          'comments')
         read_only_fields = fields
         extra_kwargs = CoverLetterListSerializer.Meta.extra_kwargs
+        versioned_fields = {
+            '1.1': ('mbox', 'comments'),
+        }
 
 
 class CoverLetterList(ListAPIView):
@@ -91,5 +98,6 @@ class CoverLetterDetail(RetrieveAPIView):
     serializer_class = CoverLetterDetailSerializer
 
     def get_queryset(self):
-        return CoverLetter.objects.all().prefetch_related('series')\
-            .select_related('project', 'submitter')
+        return CoverLetter.objects.all().prefetch_related(
+            'series', 'comments'
+        ).select_related('project', 'submitter')
diff --git a/patchwork/api/embedded.py b/patchwork/api/embedded.py
index d79724c..afd511a 100644
--- a/patchwork/api/embedded.py
+++ b/patchwork/api/embedded.py
@@ -23,6 +23,8 @@ A collection of serializers. None of the serializers here 
should reference
 nested fields.
 """
 
+import email.parser
+
 from rest_framework.serializers import CharField
 from rest_framework.serializers import SerializerMethodField
 
@@ -163,3 +165,39 @@ class 
UserProfileSerializer(BaseHyperlinkedModelSerializer):
         extra_kwargs = {
             'url': {'view_name': 'api-user-detail'},
         }
+
+
+class CommentSerializer(BaseHyperlinkedModelSerializer):
+
+    tags = SerializerMethodField()
+    subject = SerializerMethodField()
+    headers = SerializerMethodField()
+    submitter = PersonSerializer(read_only=True)
+
+    def get_tags(self, comment):
+        # TODO implement after we get support for tags on comments
+        return {}
+
+    def get_subject(self, comment):
+        return email.parser.Parser().parsestr(comment.headers,
+                                              True).get('Subject', '')
+
+    def get_headers(self, comment):
+        headers = {}
+
+        if comment.headers:
+            parsed = email.parser.Parser().parsestr(comment.headers, True)
+            for key in parsed.keys():
+                headers[key] = parsed.get_all(key)
+                # Let's return a single string instead of a list if only one
+                # header with this key is present
+                if len(headers[key]) == 1:
+                    headers[key] = headers[key][0]
+
+        return headers
+
+    class Meta:
+        model = models.Comment
+        fields = ('id', 'msgid', 'date', 'subject', 'submitter', 'tags',
+                  'content', 'headers')
+        read_only_fields = fields
diff --git a/patchwork/api/patch.py b/patchwork/api/patch.py
index 115feff..5affa87 100644
--- a/patchwork/api/patch.py
+++ b/patchwork/api/patch.py
@@ -24,11 +24,12 @@ from rest_framework.generics import ListAPIView
 from rest_framework.generics import RetrieveUpdateAPIView
 from rest_framework.relations import RelatedField
 from rest_framework.reverse import reverse
-from rest_framework.serializers import HyperlinkedModelSerializer
 from rest_framework.serializers import SerializerMethodField
 
+from patchwork.api.base import BaseHyperlinkedModelSerializer
 from patchwork.api.base import PatchworkPermission
 from patchwork.api.filters import PatchFilter
+from patchwork.api.embedded import CommentSerializer
 from patchwork.api.embedded import PersonSerializer
 from patchwork.api.embedded import ProjectSerializer
 from patchwork.api.embedded import SeriesSerializer
@@ -75,7 +76,7 @@ class StateField(RelatedField):
         return State.objects.all()
 
 
-class PatchListSerializer(HyperlinkedModelSerializer):
+class PatchListSerializer(BaseHyperlinkedModelSerializer):
 
     project = ProjectSerializer(read_only=True)
     state = StateField()
@@ -121,5 +122,6 @@ class PatchDetailSerializer(PatchListSerializer):
 
     headers = SerializerMethodField()
     prefixes = SerializerMethodField()
+    comments = CommentSerializer(many=True, read_only=True)
 
     def get_headers(self, patch):
@@ -132,10 +134,13 @@ class PatchDetailSerializer(PatchListSerializer):
     class Meta:
         model = Patch
         fields = PatchListSerializer.Meta.fields + (
-            'headers', 'content', 'diff', 'prefixes')
+            'headers', 'content', 'diff', 'prefixes', 'comments')
         read_only_fields = PatchListSerializer.Meta.read_only_fields + (
-            'headers', 'content', 'diff', 'prefixes')
+            'headers', 'content', 'diff', 'prefixes', 'comments')
         extra_kwargs = PatchListSerializer.Meta.extra_kwargs
+        versioned_fields = {
+            '1.1': ('comments', ),
+        }
 
 
 class PatchList(ListAPIView):
@@ -164,5 +169,5 @@ class PatchDetail(RetrieveUpdateAPIView):
 
     def get_queryset(self):
         return Patch.objects.all()\
-            .prefetch_related('series', 'check_set')\
+            .prefetch_related('series', 'check_set', 'comments')\
             .select_related('project', 'state', 'submitter', 'delegate')
diff --git a/patchwork/models.py b/patchwork/models.py
index f91b994..67c2d3a 100644
--- a/patchwork/models.py
+++ b/patchwork/models.py
@@ -613,6 +613,9 @@ class Comment(EmailMixin, models.Model):
         if hasattr(self.submission, 'patch'):
             self.submission.patch.refresh_tag_counts()
 
+    def is_editable(self, user):
+        return False
+
     class Meta:
         ordering = ['date']
         unique_together = [('msgid', 'submission')]
diff --git a/releasenotes/notes/comments-api-b7dff6ee4ce04c9b.yaml 
b/releasenotes/notes/comments-api-b7dff6ee4ce04c9b.yaml
new file mode 100644
index 0000000..d696aab
--- /dev/null
+++ b/releasenotes/notes/comments-api-b7dff6ee4ce04c9b.yaml
@@ -0,0 +1,8 @@
+---
+api:
+  - |
+    Comments are now exposed when checking patch and cover letter details
+    (``/patches/{patchID}`` and ``/covers/{coverID}`` endpoints). Fields `id`,
+    `msgid`, `date`, `subject`, `submitter`, `tags`, `content` and `headers`
+    are available for each comment associated with the parent submission.
+    Please note that comments are available only since API version 1.1
-- 
2.13.6

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