mirror of
https://github.com/encode/django-rest-framework.git
synced 2024-09-21 19:39:01 +03:00
428 lines
16 KiB
Python
428 lines
16 KiB
Python
"""
|
|
The :mod:`compat` module provides support for backwards compatibility with older versions of django/python.
|
|
"""
|
|
import django
|
|
|
|
# cStringIO only if it's available, otherwise StringIO
|
|
try:
|
|
import cStringIO as StringIO
|
|
except ImportError:
|
|
import StringIO
|
|
|
|
|
|
# parse_qs from 'urlparse' module unless python 2.5, in which case from 'cgi'
|
|
try:
|
|
# python >= 2.6
|
|
from urlparse import parse_qs
|
|
except ImportError:
|
|
# python < 2.6
|
|
from cgi import parse_qs
|
|
|
|
|
|
# django.test.client.RequestFactory (Required for Django < 1.3)
|
|
try:
|
|
from django.test.client import RequestFactory
|
|
except ImportError:
|
|
from django.test import Client
|
|
from django.core.handlers.wsgi import WSGIRequest
|
|
|
|
# From: http://djangosnippets.org/snippets/963/
|
|
# Lovely stuff
|
|
class RequestFactory(Client):
|
|
"""
|
|
Class that lets you create mock :obj:`Request` objects for use in testing.
|
|
|
|
Usage::
|
|
|
|
rf = RequestFactory()
|
|
get_request = rf.get('/hello/')
|
|
post_request = rf.post('/submit/', {'foo': 'bar'})
|
|
|
|
This class re-uses the :class:`django.test.client.Client` interface. Of which
|
|
you can find the docs here__.
|
|
|
|
__ http://www.djangoproject.com/documentation/testing/#the-test-client
|
|
|
|
Once you have a `request` object you can pass it to any :func:`view` function,
|
|
just as if that :func:`view` had been hooked up using a URLconf.
|
|
"""
|
|
def request(self, **request):
|
|
"""
|
|
Similar to parent class, but returns the :obj:`request` object as soon as it
|
|
has created it.
|
|
"""
|
|
environ = {
|
|
'HTTP_COOKIE': self.cookies,
|
|
'PATH_INFO': '/',
|
|
'QUERY_STRING': '',
|
|
'REQUEST_METHOD': 'GET',
|
|
'SCRIPT_NAME': '',
|
|
'SERVER_NAME': 'testserver',
|
|
'SERVER_PORT': 80,
|
|
'SERVER_PROTOCOL': 'HTTP/1.1',
|
|
}
|
|
environ.update(self.defaults)
|
|
environ.update(request)
|
|
return WSGIRequest(environ)
|
|
|
|
# django.views.generic.View (Django >= 1.3)
|
|
try:
|
|
from django.views.generic import View
|
|
if not hasattr(View, 'head'):
|
|
# First implementation of Django class-based views did not include head method
|
|
# in base View class - https://code.djangoproject.com/ticket/15668
|
|
class ViewPlusHead(View):
|
|
def head(self, request, *args, **kwargs):
|
|
return self.get(request, *args, **kwargs)
|
|
View = ViewPlusHead
|
|
|
|
except ImportError:
|
|
from django import http
|
|
from django.utils.functional import update_wrapper
|
|
# from django.utils.log import getLogger
|
|
# from django.utils.decorators import classonlymethod
|
|
|
|
# logger = getLogger('django.request') - We'll just drop support for logger if running Django <= 1.2
|
|
# Might be nice to fix this up sometime to allow djangorestframework.compat.View to match 1.3's View more closely
|
|
|
|
class View(object):
|
|
"""
|
|
Intentionally simple parent class for all views. Only implements
|
|
dispatch-by-method and simple sanity checking.
|
|
"""
|
|
|
|
http_method_names = ['get', 'post', 'put', 'delete', 'head', 'options', 'trace']
|
|
|
|
def __init__(self, **kwargs):
|
|
"""
|
|
Constructor. Called in the URLconf; can contain helpful extra
|
|
keyword arguments, and other things.
|
|
"""
|
|
# Go through keyword arguments, and either save their values to our
|
|
# instance, or raise an error.
|
|
for key, value in kwargs.iteritems():
|
|
setattr(self, key, value)
|
|
|
|
# @classonlymethod - We'll just us classmethod instead if running Django <= 1.2
|
|
@classmethod
|
|
def as_view(cls, **initkwargs):
|
|
"""
|
|
Main entry point for a request-response process.
|
|
"""
|
|
# sanitize keyword arguments
|
|
for key in initkwargs:
|
|
if key in cls.http_method_names:
|
|
raise TypeError(u"You tried to pass in the %s method name as a "
|
|
u"keyword argument to %s(). Don't do that."
|
|
% (key, cls.__name__))
|
|
if not hasattr(cls, key):
|
|
raise TypeError(u"%s() received an invalid keyword %r" % (
|
|
cls.__name__, key))
|
|
|
|
def view(request, *args, **kwargs):
|
|
self = cls(**initkwargs)
|
|
return self.dispatch(request, *args, **kwargs)
|
|
|
|
# take name and docstring from class
|
|
update_wrapper(view, cls, updated=())
|
|
|
|
# and possible attributes set by decorators
|
|
# like csrf_exempt from dispatch
|
|
update_wrapper(view, cls.dispatch, assigned=())
|
|
return view
|
|
|
|
def dispatch(self, request, *args, **kwargs):
|
|
# Try to dispatch to the right method; if a method doesn't exist,
|
|
# defer to the error handler. Also defer to the error handler if the
|
|
# request method isn't on the approved list.
|
|
if request.method.lower() in self.http_method_names:
|
|
handler = getattr(self, request.method.lower(), self.http_method_not_allowed)
|
|
else:
|
|
handler = self.http_method_not_allowed
|
|
self.request = request
|
|
self.args = args
|
|
self.kwargs = kwargs
|
|
return handler(request, *args, **kwargs)
|
|
|
|
def http_method_not_allowed(self, request, *args, **kwargs):
|
|
allowed_methods = [m for m in self.http_method_names if hasattr(self, m)]
|
|
#logger.warning('Method Not Allowed (%s): %s' % (request.method, request.path),
|
|
# extra={
|
|
# 'status_code': 405,
|
|
# 'request': self.request
|
|
# }
|
|
#)
|
|
return http.HttpResponseNotAllowed(allowed_methods)
|
|
|
|
def head(self, request, *args, **kwargs):
|
|
return self.get(request, *args, **kwargs)
|
|
|
|
# PUT, DELETE do not require CSRF until 1.4. They should. Make it better.
|
|
if django.VERSION >= (1, 4):
|
|
from django.middleware.csrf import CsrfViewMiddleware
|
|
else:
|
|
import hashlib
|
|
import re
|
|
import random
|
|
import logging
|
|
import urlparse
|
|
|
|
from django.conf import settings
|
|
from django.core.urlresolvers import get_callable
|
|
|
|
try:
|
|
from logging import NullHandler
|
|
except ImportError:
|
|
class NullHandler(logging.Handler):
|
|
def emit(self, record):
|
|
pass
|
|
|
|
logger = logging.getLogger('django.request')
|
|
|
|
if not logger.handlers:
|
|
logger.addHandler(NullHandler())
|
|
|
|
def same_origin(url1, url2):
|
|
"""
|
|
Checks if two URLs are 'same-origin'
|
|
"""
|
|
p1, p2 = urlparse.urlparse(url1), urlparse.urlparse(url2)
|
|
return p1[0:2] == p2[0:2]
|
|
|
|
def constant_time_compare(val1, val2):
|
|
"""
|
|
Returns True if the two strings are equal, False otherwise.
|
|
|
|
The time taken is independent of the number of characters that match.
|
|
"""
|
|
if len(val1) != len(val2):
|
|
return False
|
|
result = 0
|
|
for x, y in zip(val1, val2):
|
|
result |= ord(x) ^ ord(y)
|
|
return result == 0
|
|
|
|
# Use the system (hardware-based) random number generator if it exists.
|
|
if hasattr(random, 'SystemRandom'):
|
|
randrange = random.SystemRandom().randrange
|
|
else:
|
|
randrange = random.randrange
|
|
_MAX_CSRF_KEY = 18446744073709551616L # 2 << 63
|
|
|
|
REASON_NO_REFERER = "Referer checking failed - no Referer."
|
|
REASON_BAD_REFERER = "Referer checking failed - %s does not match %s."
|
|
REASON_NO_CSRF_COOKIE = "CSRF cookie not set."
|
|
REASON_BAD_TOKEN = "CSRF token missing or incorrect."
|
|
|
|
def _get_failure_view():
|
|
"""
|
|
Returns the view to be used for CSRF rejections
|
|
"""
|
|
return get_callable(settings.CSRF_FAILURE_VIEW)
|
|
|
|
def _get_new_csrf_key():
|
|
return hashlib.md5("%s%s" % (randrange(0, _MAX_CSRF_KEY), settings.SECRET_KEY)).hexdigest()
|
|
|
|
def get_token(request):
|
|
"""
|
|
Returns the the CSRF token required for a POST form. The token is an
|
|
alphanumeric value.
|
|
|
|
A side effect of calling this function is to make the the csrf_protect
|
|
decorator and the CsrfViewMiddleware add a CSRF cookie and a 'Vary: Cookie'
|
|
header to the outgoing response. For this reason, you may need to use this
|
|
function lazily, as is done by the csrf context processor.
|
|
"""
|
|
request.META["CSRF_COOKIE_USED"] = True
|
|
return request.META.get("CSRF_COOKIE", None)
|
|
|
|
def _sanitize_token(token):
|
|
# Allow only alphanum, and ensure we return a 'str' for the sake of the post
|
|
# processing middleware.
|
|
token = re.sub('[^a-zA-Z0-9]', '', str(token.decode('ascii', 'ignore')))
|
|
if token == "":
|
|
# In case the cookie has been truncated to nothing at some point.
|
|
return _get_new_csrf_key()
|
|
else:
|
|
return token
|
|
|
|
class CsrfViewMiddleware(object):
|
|
"""
|
|
Middleware that requires a present and correct csrfmiddlewaretoken
|
|
for POST requests that have a CSRF cookie, and sets an outgoing
|
|
CSRF cookie.
|
|
|
|
This middleware should be used in conjunction with the csrf_token template
|
|
tag.
|
|
"""
|
|
# The _accept and _reject methods currently only exist for the sake of the
|
|
# requires_csrf_token decorator.
|
|
def _accept(self, request):
|
|
# Avoid checking the request twice by adding a custom attribute to
|
|
# request. This will be relevant when both decorator and middleware
|
|
# are used.
|
|
request.csrf_processing_done = True
|
|
return None
|
|
|
|
def _reject(self, request, reason):
|
|
return _get_failure_view()(request, reason=reason)
|
|
|
|
def process_view(self, request, callback, callback_args, callback_kwargs):
|
|
|
|
if getattr(request, 'csrf_processing_done', False):
|
|
return None
|
|
|
|
try:
|
|
csrf_token = _sanitize_token(request.COOKIES[settings.CSRF_COOKIE_NAME])
|
|
# Use same token next time
|
|
request.META['CSRF_COOKIE'] = csrf_token
|
|
except KeyError:
|
|
csrf_token = None
|
|
# Generate token and store it in the request, so it's available to the view.
|
|
request.META["CSRF_COOKIE"] = _get_new_csrf_key()
|
|
|
|
# Wait until request.META["CSRF_COOKIE"] has been manipulated before
|
|
# bailing out, so that get_token still works
|
|
if getattr(callback, 'csrf_exempt', False):
|
|
return None
|
|
|
|
# Assume that anything not defined as 'safe' by RC2616 needs protection.
|
|
if request.method not in ('GET', 'HEAD', 'OPTIONS', 'TRACE'):
|
|
if getattr(request, '_dont_enforce_csrf_checks', False):
|
|
# Mechanism to turn off CSRF checks for test suite. It comes after
|
|
# the creation of CSRF cookies, so that everything else continues to
|
|
# work exactly the same (e.g. cookies are sent etc), but before the
|
|
# any branches that call reject()
|
|
return self._accept(request)
|
|
|
|
if request.is_secure():
|
|
# Suppose user visits http://example.com/
|
|
# An active network attacker,(man-in-the-middle, MITM) sends a
|
|
# POST form which targets https://example.com/detonate-bomb/ and
|
|
# submits it via javascript.
|
|
#
|
|
# The attacker will need to provide a CSRF cookie and token, but
|
|
# that is no problem for a MITM and the session independent
|
|
# nonce we are using. So the MITM can circumvent the CSRF
|
|
# protection. This is true for any HTTP connection, but anyone
|
|
# using HTTPS expects better! For this reason, for
|
|
# https://example.com/ we need additional protection that treats
|
|
# http://example.com/ as completely untrusted. Under HTTPS,
|
|
# Barth et al. found that the Referer header is missing for
|
|
# same-domain requests in only about 0.2% of cases or less, so
|
|
# we can use strict Referer checking.
|
|
referer = request.META.get('HTTP_REFERER')
|
|
if referer is None:
|
|
logger.warning('Forbidden (%s): %s' % (REASON_NO_REFERER, request.path),
|
|
extra={
|
|
'status_code': 403,
|
|
'request': request,
|
|
}
|
|
)
|
|
return self._reject(request, REASON_NO_REFERER)
|
|
|
|
# Note that request.get_host() includes the port
|
|
good_referer = 'https://%s/' % request.get_host()
|
|
if not same_origin(referer, good_referer):
|
|
reason = REASON_BAD_REFERER % (referer, good_referer)
|
|
logger.warning('Forbidden (%s): %s' % (reason, request.path),
|
|
extra={
|
|
'status_code': 403,
|
|
'request': request,
|
|
}
|
|
)
|
|
return self._reject(request, reason)
|
|
|
|
if csrf_token is None:
|
|
# No CSRF cookie. For POST requests, we insist on a CSRF cookie,
|
|
# and in this way we can avoid all CSRF attacks, including login
|
|
# CSRF.
|
|
logger.warning('Forbidden (%s): %s' % (REASON_NO_CSRF_COOKIE, request.path),
|
|
extra={
|
|
'status_code': 403,
|
|
'request': request,
|
|
}
|
|
)
|
|
return self._reject(request, REASON_NO_CSRF_COOKIE)
|
|
|
|
# check non-cookie token for match
|
|
request_csrf_token = ""
|
|
if request.method == "POST":
|
|
request_csrf_token = request.POST.get('csrfmiddlewaretoken', '')
|
|
|
|
if request_csrf_token == "":
|
|
# Fall back to X-CSRFToken, to make things easier for AJAX,
|
|
# and possible for PUT/DELETE
|
|
request_csrf_token = request.META.get('HTTP_X_CSRFTOKEN', '')
|
|
|
|
if not constant_time_compare(request_csrf_token, csrf_token):
|
|
logger.warning('Forbidden (%s): %s' % (REASON_BAD_TOKEN, request.path),
|
|
extra={
|
|
'status_code': 403,
|
|
'request': request,
|
|
}
|
|
)
|
|
return self._reject(request, REASON_BAD_TOKEN)
|
|
|
|
return self._accept(request)
|
|
|
|
|
|
# Markdown is optional
|
|
try:
|
|
import markdown
|
|
|
|
def apply_markdown(text):
|
|
"""
|
|
Simple wrapper around :func:`markdown.markdown` to set the base level
|
|
of '#' style headers to <h2>.
|
|
"""
|
|
|
|
extensions = ['headerid(level=2)']
|
|
safe_mode = False,
|
|
md = markdown.Markdown(extensions=extensions, safe_mode=safe_mode)
|
|
return md.convert(text)
|
|
|
|
except ImportError:
|
|
apply_markdown = None
|
|
|
|
|
|
# Yaml is optional
|
|
try:
|
|
import yaml
|
|
except ImportError:
|
|
yaml = None
|
|
|
|
|
|
import unittest
|
|
try:
|
|
import unittest.skip
|
|
except ImportError: # python < 2.7
|
|
from unittest import TestCase
|
|
import functools
|
|
|
|
def skip(reason):
|
|
# Pasted from py27/lib/unittest/case.py
|
|
"""
|
|
Unconditionally skip a test.
|
|
"""
|
|
def decorator(test_item):
|
|
if not (isinstance(test_item, type) and issubclass(test_item, TestCase)):
|
|
@functools.wraps(test_item)
|
|
def skip_wrapper(*args, **kwargs):
|
|
pass
|
|
test_item = skip_wrapper
|
|
|
|
test_item.__unittest_skip__ = True
|
|
test_item.__unittest_skip_why__ = reason
|
|
return test_item
|
|
return decorator
|
|
|
|
unittest.skip = skip
|
|
|
|
|
|
# xml.etree.parse only throws ParseError for python >= 2.7
|
|
try:
|
|
from xml.etree import ParseError as ETParseError
|
|
except ImportError: # python < 2.7
|
|
ETParseError = None
|