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From 50062c4d8c4108d17b7f12d9518ce883956d3921 Mon Sep 17 00:00:00 2001
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From: David Lord <davidism@gmail.com>
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Date: Tue, 10 Apr 2018 09:29:48 -0700
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Subject: [PATCH] detect UTF encodings when loading json
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(cherry picked from commit 0e1e9a04aaf29ab78f721cfc79ac2a691f6e3929)
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---
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flask/json.py | 49 ++++++++++++++++++++++++++++++++++++++++++-
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flask/wrappers.py | 13 +++---------
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tests/test_helpers.py | 28 ++++++++++++++-----------
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3 files changed, 67 insertions(+), 23 deletions(-)
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diff --git a/flask/json.py b/flask/json.py
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index 16e0c29..114873e 100644
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--- a/flask/json.py
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+++ b/flask/json.py
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@@ -8,6 +8,7 @@
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:copyright: (c) 2015 by Armin Ronacher.
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:license: BSD, see LICENSE for more details.
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"""
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+import codecs
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import io
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import uuid
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from datetime import date
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@@ -108,6 +109,49 @@ def _load_arg_defaults(kwargs):
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kwargs.setdefault('cls', JSONDecoder)
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+def detect_encoding(data):
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+ """Detect which UTF codec was used to encode the given bytes.
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+
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+ The latest JSON standard (:rfc:`8259`) suggests that only UTF-8 is
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+ accepted. Older documents allowed 8, 16, or 32. 16 and 32 can be big
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+ or little endian. Some editors or libraries may prepend a BOM.
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+
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+ :param data: Bytes in unknown UTF encoding.
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+ :return: UTF encoding name
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+ """
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+ head = data[:4]
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+
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+ if head[:3] == codecs.BOM_UTF8:
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+ return 'utf-8-sig'
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+
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+ if b'\x00' not in head:
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+ return 'utf-8'
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+
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+ if head in (codecs.BOM_UTF32_BE, codecs.BOM_UTF32_LE):
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+ return 'utf-32'
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+
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+ if head[:2] in (codecs.BOM_UTF16_BE, codecs.BOM_UTF16_LE):
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+ return 'utf-16'
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+
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+ if len(head) == 4:
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+ if head[:3] == b'\x00\x00\x00':
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+ return 'utf-32-be'
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+
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+ if head[::2] == b'\x00\x00':
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+ return 'utf-16-be'
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+
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+ if head[1:] == b'\x00\x00\x00':
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+ return 'utf-32-le'
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+
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+ if head[1::2] == b'\x00\x00':
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+ return 'utf-16-le'
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+
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+ if len(head) == 2:
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+ return 'utf-16-be' if head.startswith(b'\x00') else 'utf-16-le'
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+
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+ return 'utf-8'
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+
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+
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def dumps(obj, **kwargs):
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"""Serialize ``obj`` to a JSON formatted ``str`` by using the application's
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configured encoder (:attr:`~flask.Flask.json_encoder`) if there is an
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@@ -142,7 +186,10 @@ def loads(s, **kwargs):
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"""
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_load_arg_defaults(kwargs)
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if isinstance(s, bytes):
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- s = s.decode(kwargs.pop('encoding', None) or 'utf-8')
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+ encoding = kwargs.pop('encoding', None)
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+ if encoding is None:
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+ encoding = detect_encoding(s)
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+ s = s.decode(encoding)
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return _json.loads(s, **kwargs)
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diff --git a/flask/wrappers.py b/flask/wrappers.py
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index 04bdcb5..3e600fc 100644
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--- a/flask/wrappers.py
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+++ b/flask/wrappers.py
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@@ -144,17 +144,10 @@ class Request(RequestBase):
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if not (force or self.is_json):
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return None
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- # We accept a request charset against the specification as
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- # certain clients have been using this in the past. This
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- # fits our general approach of being nice in what we accept
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- # and strict in what we send out.
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- request_charset = self.mimetype_params.get('charset')
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+ data = _get_data(self, cache)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
try:
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- data = _get_data(self, cache)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- if request_charset is not None:
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- rv = json.loads(data, encoding=request_charset)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- else:
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- rv = json.loads(data)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+ rv = json.loads(data)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
except ValueError as e:
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
if silent:
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
rv = None
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
diff --git a/tests/test_helpers.py b/tests/test_helpers.py
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
index 9320ef7..9990782 100644
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
--- a/tests/test_helpers.py
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+++ b/tests/test_helpers.py
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
@@ -21,6 +21,8 @@ from werkzeug.datastructures import Range
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
from werkzeug.exceptions import BadRequest, NotFound
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
from werkzeug.http import parse_cache_control_header, parse_options_header
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
from werkzeug.http import http_date
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+from flask import json
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
from flask._compat import StringIO, text_type
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
@@ -34,6 +36,20 @@ def has_encoding(name):
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
class TestJSON(object):
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+ @pytest.mark.parametrize('value', (
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+ 1, 't', True, False, None,
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+ [], [1, 2, 3],
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+ {}, {'foo': u'🐍'},
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+ ))
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+ @pytest.mark.parametrize('encoding', (
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+ 'utf-8', 'utf-8-sig',
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+ 'utf-16-le', 'utf-16-be', 'utf-16',
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+ 'utf-32-le', 'utf-32-be', 'utf-32',
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+ ))
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+ def test_detect_encoding(self, value, encoding):
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+ data = json.dumps(value).encode(encoding)
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+ assert json.detect_encoding(data) == encoding
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
+ assert json.loads(data) == value
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
def test_ignore_cached_json(self):
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
app = flask.Flask(__name__)
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
@@ -85,18 +101,6 @@ class TestJSON(object):
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
rv = c.post('/json', data='"foo"', content_type='application/x+json')
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
assert rv.data == b'foo'
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- def test_json_body_encoding(self):
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- app = flask.Flask(__name__)
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- app.testing = True
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- @app.route('/')
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- def index():
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- return flask.request.get_json()
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
-
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- c = app.test_client()
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- resp = c.get('/', data=u'"Hällo Wörld"'.encode('iso-8859-15'),
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- content_type='application/json; charset=iso-8859-15')
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
- assert resp.data == u'Hällo Wörld'.encode('utf-8')
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
-
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
def test_json_as_unicode(self):
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
app = flask.Flask(__name__)
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
--
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
2.17.1
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
8a7204 |
|