Drop trailing whitespace on indented JSON output. Closes #2429.

rest_framework/compat.py

@@ -227,6 +227,8 @@ except ImportError:
 if six.PY3:
     SHORT_SEPARATORS = (',', ':')
     LONG_SEPARATORS = (', ', ': ')
+    INDENT_SEPARATORS = (',', ': ')
 else:
     SHORT_SEPARATORS = (b',', b':')
     LONG_SEPARATORS = (b', ', b': ')
+    INDENT_SEPARATORS = (b',', b': ')

rest_framework/renderers.py

@@ -18,7 +18,7 @@ from django.template import Context, RequestContext, loader, Template
 from django.test.client import encode_multipart
 from django.utils import six
 from rest_framework import exceptions, serializers, status, VERSION
-from rest_framework.compat import SHORT_SEPARATORS, LONG_SEPARATORS
+from rest_framework.compat import SHORT_SEPARATORS, LONG_SEPARATORS, INDENT_SEPARATORS
 from rest_framework.exceptions import ParseError
 from rest_framework.settings import api_settings
 from rest_framework.request import is_form_media_type, override_method
@@ -87,7 +87,11 @@ class JSONRenderer(BaseRenderer):
 
         renderer_context = renderer_context or {}
         indent = self.get_indent(accepted_media_type, renderer_context)
-        separators = SHORT_SEPARATORS if (indent is None and self.compact) else LONG_SEPARATORS
+
+        if indent is None:
+            separators = SHORT_SEPARATORS if self.compact else LONG_SEPARATORS
+        else:
+            separators = INDENT_SEPARATORS
 
         ret = json.dumps(
             data, cls=self.encoder_class,

tests/test_renderers.py

@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
-
 from django.conf.urls import patterns, url, include
 from django.core.cache import cache
 from django.db import models
@@ -8,6 +7,7 @@ from django.test import TestCase
 from django.utils import six
 from django.utils.translation import ugettext_lazy as _
 from rest_framework import status, permissions
+from rest_framework.compat import OrderedDict
 from rest_framework.response import Response
 from rest_framework.views import APIView
 from rest_framework.renderers import BaseRenderer, JSONRenderer, BrowsableAPIRenderer
@@ -489,3 +489,25 @@ class CacheRenderTest(TestCase):
         cached_resp = cache.get(self.cache_key)
         self.assertIsInstance(cached_resp, Response)
         self.assertEqual(cached_resp.content, resp.content)
+
+
+class TestJSONIndentationStyles:
+    def test_indented(self):
+        renderer = JSONRenderer()
+        data = OrderedDict([('a', 1), ('b', 2)])
+        assert renderer.render(data) == b'{"a":1,"b":2}'
+
+    def test_compact(self):
+        renderer = JSONRenderer()
+        data = OrderedDict([('a', 1), ('b', 2)])
+        context = {'indent': 4}
+        assert (
+            renderer.render(data, renderer_context=context) ==
+            b'{\n    "a": 1,\n    "b": 2\n}'
+        )
+
+    def test_long_form(self):
+        renderer = JSONRenderer()
+        renderer.compact = False
+        data = OrderedDict([('a', 1), ('b', 2)])
+        assert renderer.render(data) == b'{"a": 1, "b": 2}'