Fix json violation according to RFC7159 for infinity/NaN

rest_framework/utils/encoders.py

@@ -6,6 +6,9 @@ from __future__ import unicode_literals
 import datetime
 import decimal
 import json
+from json.encoder import (FLOAT_REPR, INFINITY, c_make_encoder, 
+                          encode_basestring_ascii, encode_basestring, 
+                          _make_iterencode)
 import uuid
 
 from django.db.models.query import QuerySet
@@ -21,6 +24,72 @@ class JSONEncoder(json.JSONEncoder):
     JSONEncoder subclass that knows how to encode date/time/timedelta,
     decimal types, generators and other basic python objects.
     """
+
+    def iterencode(self, o, _one_shot=False):
+        """Encode the given object and yield each string
+        representation as available.
+        For example::
+            for chunk in JSONEncoder().iterencode(bigobject):
+                mysocket.write(chunk)
+        """
+        if self.check_circular:
+            markers = {}
+        else:
+            markers = None
+        if self.ensure_ascii:
+            _encoder = encode_basestring_ascii
+        else:
+            _encoder = encode_basestring
+        if six.PY2:
+            if self.encoding != 'utf-8':
+                def _encoder(o, _orig_encoder=_encoder,
+                             _encoding=self.encoding):
+                    if isinstance(o, str):
+                        o = o.decode(_encoding)
+                    return _orig_encoder(o)
+
+        if self.encoding != 'utf-8':
+            def _encoder(o, _orig_encoder=_encoder, _encoding=self.encoding):
+                if isinstance(o, str):
+                    o = o.decode(_encoding)
+                return _orig_encoder(o)
+
+        def floatstr(o, allow_nan=self.allow_nan,
+                _repr=FLOAT_REPR, _inf=INFINITY, _neginf=-INFINITY):
+            # Check for specials.  Note that this type of test is processor
+            # and/or platform-specific, so do tests which don't depend on the
+            # internals.
+
+            if o != o:
+                text = 'null'
+            elif o == _inf:
+                text = 'null'
+            elif o == _neginf:
+                text = 'null'
+            else:
+                return _repr(o)
+
+            if not allow_nan:
+                raise ValueError(
+                    "Out of range float values are not JSON compliant: " +
+                    repr(o))
+
+            return text
+
+
+        if (_one_shot and c_make_encoder is not None
+                and self.indent is None):
+            _iterencode = c_make_encoder(
+                markers, self.default, _encoder, self.indent,
+                self.key_separator, self.item_separator, self.sort_keys,
+                self.skipkeys, self.allow_nan)
+        else:
+            _iterencode = _make_iterencode(
+                markers, self.default, _encoder, self.indent, floatstr,
+                self.key_separator, self.item_separator, self.sort_keys,
+                self.skipkeys, _one_shot)
+        return _iterencode(o, 0)
+
     def default(self, obj):
         # For Date Time string spec, see ECMA 262
         # http://ecma-international.org/ecma-262/5.1/#sec-15.9.1.15
@@ -55,7 +124,8 @@ class JSONEncoder(json.JSONEncoder):
         elif hasattr(obj, 'tolist'):
             # Numpy arrays and array scalars.
             return obj.tolist()
-        elif (coreapi is not None) and isinstance(obj, (coreapi.Document, coreapi.Error)):
+        elif (coreapi is not None) and isinstance(obj, (coreapi.Document, 
+                                                        coreapi.Error)):
             raise RuntimeError(
                 'Cannot return a coreapi object from a JSON view. '
                 'You should be using a schema renderer instead for this view.'