From 6e2ecc181753282e2ed41ebd0e33dd63a9fc6529 Mon Sep 17 00:00:00 2001
From: Shane Harvey <shane.harvey@mongodb.com>
Date: Thu, 28 Jul 2016 11:13:10 -0700
Subject: [PATCH] PYTHON-1111 JSONOptions.document_class requires simplejson in
 Python2.6

---
 bson/json_util.py      | 34 ++++++++++++++++++++++++++++++----
 doc/changelog.rst      | 19 +++++++++++++++++++
 test/test_json_util.py | 23 ++++++++++++++++++++---
 3 files changed, 69 insertions(+), 7 deletions(-)

diff --git a/bson/json_util.py b/bson/json_util.py
index cfa67ae7c..448b61dea 100644
--- a/bson/json_util.py
+++ b/bson/json_util.py
@@ -70,10 +70,24 @@ but it will be faster as there is less recursion.
 import base64
 import collections
 import datetime
-import json
 import re
+import sys
 import uuid
 
+_HAS_OBJECT_PAIRS_HOOK = True
+if sys.version_info[:2] == (2, 6):
+    # In Python 2.6, json does not include object_pairs_hook. Use simplejson
+    # instead.
+    try:
+        import simplejson as json
+    except ImportError:
+        import json
+        _HAS_OBJECT_PAIRS_HOOK = False
+else:
+    import json
+
+from pymongo.errors import ConfigurationError
+
 import bson
 from bson import EPOCH_AWARE, RE_TYPE, SON
 from bson.binary import (Binary, JAVA_LEGACY, CSHARP_LEGACY, OLD_UUID_SUBTYPE,
@@ -106,6 +120,10 @@ _RE_OPT_TABLE = {
 class JSONOptions(CodecOptions):
     """Encapsulates JSON options for :func:`dumps` and :func:`loads`.
 
+    Raises :exc:`~pymongo.errors.ConfigurationError` on Python 2.6 if
+    `simplejson <https://pypi.python.org/pypi/simplejson>`_ is not installed
+    and document_class is not the default (:class:`dict`).
+
     :Parameters:
       - `strict_number_long`: If ``True``, :class:`~bson.int64.Int64` objects
         are encoded to MongoDB Extended JSON's *Strict mode* type
@@ -145,6 +163,11 @@ class JSONOptions(CodecOptions):
         if kwargs["tz_aware"]:
             kwargs["tzinfo"] = kwargs.get("tzinfo", utc)
         self = super(JSONOptions, cls).__new__(cls, *args, **kwargs)
+        if not _HAS_OBJECT_PAIRS_HOOK and self.document_class != dict:
+            raise ConfigurationError(
+                "Support for JSONOptions.document_class on Python 2.6 "
+                "requires simplejson "
+                "(https://pypi.python.org/pypi/simplejson) to be installed.")
         self.strict_number_long = strict_number_long
         self.strict_date = strict_date
         self.strict_uuid = strict_uuid
@@ -177,7 +200,7 @@ def dumps(obj, *args, **kwargs):
     Recursive function that handles all BSON types including
     :class:`~bson.binary.Binary` and :class:`~bson.code.Code`.
 
-    Raises :class:`~bson.errors.InvalidDatetime` if `obj` contains a
+    Raises :exc:`~bson.errors.InvalidDatetime` if `obj` contains a
     :class:`datetime.datetime` without a timezone and
     `json_options.strict_date` is ``True``.
 
@@ -211,8 +234,11 @@ def loads(s, *args, **kwargs):
        Accepts optional parameter `json_options`. See :class:`JSONOptions`.
     """
     json_options = kwargs.pop("json_options", DEFAULT_JSON_OPTIONS)
-    kwargs["object_pairs_hook"] = lambda pairs: object_pairs_hook(pairs,
-                                                                  json_options)
+    if _HAS_OBJECT_PAIRS_HOOK:
+        kwargs["object_pairs_hook"] = lambda pairs: object_pairs_hook(
+            pairs, json_options)
+    else:
+        kwargs["object_hook"] = lambda obj: object_hook(obj, json_options)
     return json.loads(s, *args, **kwargs)
 
 
diff --git a/doc/changelog.rst b/doc/changelog.rst
index 68b2d40e5..95580615c 100644
--- a/doc/changelog.rst
+++ b/doc/changelog.rst
@@ -1,6 +1,25 @@
 Changelog
 =========
 
+Changes in Version 3.4
+----------------------
+
+Version 3.4 implements the new server features introduced in MongoDB 3.4:
+
+Highlights include:
+
+- Finer control over JSON encoding/decoding with
+  :class:`~bson.json_util.JSONOptions`.
+
+
+Issues Resolved
+...............
+
+See the `PyMongo 3.4 release notes in JIRA`_ for the list of resolved issues
+in this release.
+
+.. _PyMongo 3.4 release notes in JIRA: https://jira.mongodb.org/browse/PYTHON/fixforversion/16594
+
 Changes in Version 3.3
 ----------------------
 
diff --git a/test/test_json_util.py b/test/test_json_util.py
index 1df9bb3ce..ce8a419d9 100644
--- a/test/test_json_util.py
+++ b/test/test_json_util.py
@@ -20,8 +20,16 @@ import re
 import sys
 import uuid
 
+try:
+    import simplejson
+    HAS_SIMPLE_JSON = True
+except ImportError:
+    HAS_SIMPLE_JSON = False
+
 sys.path[0:0] = [""]
 
+from pymongo.errors import ConfigurationError
+
 from bson import json_util, EPOCH_AWARE, EPOCH_NAIVE, SON
 from bson.binary import (Binary, MD5_SUBTYPE, USER_DEFINED_SUBTYPE,
                          JAVA_LEGACY, CSHARP_LEGACY, STANDARD)
@@ -39,6 +47,7 @@ from bson.tz_util import FixedOffset, utc
 from test import unittest, IntegrationTest
 
 PY3 = sys.version_info[0] == 3
+PY26 = sys.version_info[:2] == (2, 6)
 
 
 class TestJsonUtil(unittest.TestCase):
@@ -321,9 +330,17 @@ class TestJsonUtil(unittest.TestCase):
                          jsn)
 
     def test_loads_document_class(self):
-        self.assertEqual(SON([("foo", "bar"), ("b", 1)]), json_util.loads(
-            '{"foo": "bar", "b": 1}',
-            json_options=json_util.JSONOptions(document_class=SON)))
+        # document_class dict should always work
+        self.assertEqual({"foo": "bar"}, json_util.loads(
+            '{"foo": "bar"}',
+            json_options=json_util.JSONOptions(document_class=dict)))
+        if PY26 and not HAS_SIMPLE_JSON:
+            self.assertRaises(
+                ConfigurationError, json_util.JSONOptions, document_class=SON)
+        else:
+            self.assertEqual(SON([("foo", "bar"), ("b", 1)]), json_util.loads(
+                '{"foo": "bar", "b": 1}',
+                json_options=json_util.JSONOptions(document_class=SON)))
 
 
 class TestJsonUtilRoundtrip(IntegrationTest):