Allow parsing null JSON data

awx/api/parsers.py

@@ -57,8 +57,10 @@ class JSONParser(parsers.JSONParser):
 
         try:
             data = stream.read().decode(encoding)
+            if not data:
+                return {}
             obj = json.loads(data, object_pairs_hook=OrderedDict)
-            if not isinstance(obj, dict):
+            if not isinstance(obj, dict) and obj is not None:
                 raise ParseError(_('JSON parse error - not a JSON object'))
             return obj
         except ValueError as exc:

awx/main/tests/unit/api/test_parsers.py

@@ -0,0 +1,29 @@
+import pytest
+import StringIO
+
+# AWX
+from awx.api.parsers import JSONParser
+
+# Django REST Framework
+from rest_framework.exceptions import ParseError
+
+
+@pytest.mark.parametrize(
+    'input_, output', [
+        ('{"foo": "bar"}', {'foo': 'bar'}),
+        ('null', None),
+        ('', {}),
+    ]
+)
+def test_jsonparser_valid_input(input_, output):
+    input_stream = StringIO.StringIO(input_)
+    assert JSONParser().parse(input_stream) == output
+    input_stream.close()
+
+
+@pytest.mark.parametrize('invalid_input', ['1', '"foobar"', '3.14', '{"foo": "bar",}'])
+def test_json_parser_invalid_input(invalid_input):
+    input_stream = StringIO.StringIO(invalid_input)
+    with pytest.raises(ParseError):
+        JSONParser().parse(input_stream)
+    input_stream.close()