[PATCH] api: Show all headers with the same key

[vkabatov at redhat.com]

From: Veronika Kabatova <vkabatov at redhat.com>

While the code on our side returns all (key, value) pairs for email
headers, Django's REST framework probably uses dictionaries behind the
scenes. This means that having multiple headers with same key (eg
'Received', which is totally valid and common situation), only one of
these headers is visible in the REST API.

Let's hack around this by returning a list of values in case the key is
present multiple times.

Signed-off-by: Veronika Kabatova <vkabatov at redhat.com>
---
 patchwork/api/cover.py | 12 +++++++++++-
 patchwork/api/patch.py | 12 +++++++++++-
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/patchwork/api/cover.py b/patchwork/api/cover.py
index 1064504..dd1db97 100644
--- a/patchwork/api/cover.py
+++ b/patchwork/api/cover.py
@@ -57,8 +57,18 @@ class CoverLetterDetailSerializer(CoverLetterListSerializer):
     headers = SerializerMethodField()
 
     def get_headers(self, instance):
+        headers = {}
+
         if instance.headers:
-            return email.parser.Parser().parsestr(instance.headers, True)
+            parsed = email.parser.Parser().parsestr(instance.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 = CoverLetter
diff --git a/patchwork/api/patch.py b/patchwork/api/patch.py
index 115feff..645b0e9 100644
--- a/patchwork/api/patch.py
+++ b/patchwork/api/patch.py
@@ -123,8 +123,18 @@ class PatchDetailSerializer(PatchListSerializer):
     prefixes = SerializerMethodField()
 
     def get_headers(self, patch):
+        headers = {}
+
         if patch.headers:
-            return email.parser.Parser().parsestr(patch.headers, True)
+            parsed = email.parser.Parser().parsestr(patch.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
 
     def get_prefixes(self, instance):
         return clean_subject(instance.name)[1]
-- 
2.13.6