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import datetime
import os
import re
import time
from pprint import pformat
from urllib import urlencode, quote
from urlparse import urljoin, urlparse
try:
from cStringIO import StringIO
except ImportError:
from StringIO import StringIO
try:
# The mod_python version is more efficient, so try importing it first.
from mod_python.util import parse_qsl
except ImportError:
try:
# Python 2.6 and greater
from urlparse import parse_qsl
except ImportError:
# Python 2.5, 2.4. Works on Python 2.6 but raises
# PendingDeprecationWarning
from cgi import parse_qsl
import Cookie
# httponly support exists in Python 2.6's Cookie library,
# but not in Python 2.4 or 2.5.
_morsel_supports_httponly = Cookie.Morsel._reserved.has_key('httponly')
# Some versions of Python 2.7 and later won't need this encoding bug fix:
_cookie_encodes_correctly = Cookie.SimpleCookie().value_encode(';') == (';', '"\\073"')
# See ticket #13007, http://bugs.python.org/issue2193 and http://trac.edgewall.org/ticket/2256
_tc = Cookie.SimpleCookie()
_tc.load('f:oo')
_cookie_allows_colon_in_names = 'Set-Cookie: f:oo=' in _tc.output()
if _morsel_supports_httponly and _cookie_encodes_correctly and _cookie_allows_colon_in_names:
SimpleCookie = Cookie.SimpleCookie
else:
if not _morsel_supports_httponly:
class Morsel(Cookie.Morsel):
def __setitem__(self, K, V):
K = K.lower()
if K == "httponly":
if V:
# The superclass rejects httponly as a key,
# so we jump to the grandparent.
super(Cookie.Morsel, self).__setitem__(K, V)
else:
super(Morsel, self).__setitem__(K, V)
def OutputString(self, attrs=None):
output = super(Morsel, self).OutputString(attrs)
if "httponly" in self:
output += "; httponly"
return output
class SimpleCookie(Cookie.SimpleCookie):
if not _morsel_supports_httponly:
def __set(self, key, real_value, coded_value):
M = self.get(key, Morsel())
M.set(key, real_value, coded_value)
dict.__setitem__(self, key, M)
def __setitem__(self, key, value):
rval, cval = self.value_encode(value)
self.__set(key, rval, cval)
if not _cookie_encodes_correctly:
def value_encode(self, val):
# Some browsers do not support quoted-string from RFC 2109,
# including some versions of Safari and Internet Explorer.
# These browsers split on ';', and some versions of Safari
# are known to split on ', '. Therefore, we encode ';' and ','
# SimpleCookie already does the hard work of encoding and decoding.
# It uses octal sequences like '\\012' for newline etc.
# and non-ASCII chars. We just make use of this mechanism, to
# avoid introducing two encoding schemes which would be confusing
# and especially awkward for javascript.
# NB, contrary to Python docs, value_encode returns a tuple containing
# (real val, encoded_val)
val, encoded = super(SimpleCookie, self).value_encode(val)
encoded = encoded.replace(";", "\\073").replace(",","\\054")
# If encoded now contains any quoted chars, we need double quotes
# around the whole string.
if "\\" in encoded and not encoded.startswith('"'):
encoded = '"' + encoded + '"'
return val, encoded
if not _cookie_allows_colon_in_names:
def load(self, rawdata, ignore_parse_errors=False):
if ignore_parse_errors:
self.bad_cookies = set()
self._BaseCookie__set = self._loose_set
super(SimpleCookie, self).load(rawdata)
if ignore_parse_errors:
self._BaseCookie__set = self._strict_set
for key in self.bad_cookies:
del self[key]
_strict_set = Cookie.BaseCookie._BaseCookie__set
def _loose_set(self, key, real_value, coded_value):
try:
self._strict_set(key, real_value, coded_value)
except Cookie.CookieError:
self.bad_cookies.add(key)
dict.__setitem__(self, key, Cookie.Morsel())
class CompatCookie(SimpleCookie):
def __init__(self, *args, **kwargs):
super(CompatCookie, self).__init__(*args, **kwargs)
import warnings
warnings.warn("CompatCookie is deprecated, use django.http.SimpleCookie instead.",
PendingDeprecationWarning)
from django.core.exceptions import SuspiciousOperation
from django.utils.datastructures import MultiValueDict, ImmutableList
from django.utils.encoding import smart_str, iri_to_uri, force_unicode
from django.utils.http import cookie_date
from django.http.multipartparser import MultiPartParser
from django.conf import settings
from django.core.files import uploadhandler
from utils import *
RESERVED_CHARS="!*'();:@&=+$,/?%#[]"
absolute_http_url_re = re.compile(r"^https?://", re.I)
host_validation_re = re.compile(r"^([a-z0-9.-]+|\[[a-f0-9]*:[a-f0-9:]+\])(:\d+)?$")
class Http404(Exception):
pass
class HttpRequest(object):
"""A basic HTTP request."""
# The encoding used in GET/POST dicts. None means use default setting.
_encoding = None
_upload_handlers = []
def __init__(self):
self.GET, self.POST, self.COOKIES, self.META, self.FILES = {}, {}, {}, {}, {}
self.path = ''
self.path_info = ''
self.method = None
def __repr__(self):
return '<HttpRequest\nGET:%s,\nPOST:%s,\nCOOKIES:%s,\nMETA:%s>' % \
(pformat(self.GET), pformat(self.POST), pformat(self.COOKIES),
pformat(self.META))
def get_host(self):
"""Returns the HTTP host using the environment or request headers."""
# We try three options, in order of decreasing preference.
if settings.USE_X_FORWARDED_HOST and (
'HTTP_X_FORWARDED_HOST' in self.META):
host = self.META['HTTP_X_FORWARDED_HOST']
elif 'HTTP_HOST' in self.META:
host = self.META['HTTP_HOST']
else:
# Reconstruct the host using the algorithm from PEP 333.
host = self.META['SERVER_NAME']
server_port = str(self.META['SERVER_PORT'])
if server_port != (self.is_secure() and '443' or '80'):
host = '%s:%s' % (host, server_port)
if settings.DEBUG:
allowed_hosts = ['*']
else:
allowed_hosts = settings.ALLOWED_HOSTS
if validate_host(host, allowed_hosts):
return host
else:
raise SuspiciousOperation(
"Invalid HTTP_HOST header (you may need to set ALLOWED_HOSTS): %s" % host)
def get_full_path(self):
# RFC 3986 requires query string arguments to be in the ASCII range.
# Rather than crash if this doesn't happen, we encode defensively.
return '%s%s' % (self.path, self.META.get('QUERY_STRING', '') and ('?' + iri_to_uri(self.META.get('QUERY_STRING', ''))) or '')
def build_absolute_uri(self, location=None):
"""
Builds an absolute URI from the location and the variables available in
this request. If no location is specified, the absolute URI is built on
``request.get_full_path()``.
"""
if not location:
location = self.get_full_path()
if not absolute_http_url_re.match(location):
current_uri = '%s://%s%s' % (self.is_secure() and 'https' or 'http',
self.get_host(), self.path)
location = urljoin(current_uri, location)
return iri_to_uri(location)
def is_secure(self):
return os.environ.get("HTTPS") == "on"
def is_ajax(self):
return self.META.get('HTTP_X_REQUESTED_WITH') == 'XMLHttpRequest'
def _set_encoding(self, val):
"""
Sets the encoding used for GET/POST accesses. If the GET or POST
dictionary has already been created, it is removed and recreated on the
next access (so that it is decoded correctly).
"""
self._encoding = val
if hasattr(self, '_get'):
del self._get
if hasattr(self, '_post'):
del self._post
def _get_encoding(self):
return self._encoding
encoding = property(_get_encoding, _set_encoding)
def _initialize_handlers(self):
self._upload_handlers = [uploadhandler.load_handler(handler, self)
for handler in settings.FILE_UPLOAD_HANDLERS]
def _set_upload_handlers(self, upload_handlers):
if hasattr(self, '_files'):
raise AttributeError("You cannot set the upload handlers after the upload has been processed.")
self._upload_handlers = upload_handlers
def _get_upload_handlers(self):
if not self._upload_handlers:
# If thre are no upload handlers defined, initialize them from settings.
self._initialize_handlers()
return self._upload_handlers
upload_handlers = property(_get_upload_handlers, _set_upload_handlers)
def parse_file_upload(self, META, post_data):
"""Returns a tuple of (POST QueryDict, FILES MultiValueDict)."""
self.upload_handlers = ImmutableList(
self.upload_handlers,
warning = "You cannot alter upload handlers after the upload has been processed."
)
parser = MultiPartParser(META, post_data, self.upload_handlers, self.encoding)
return parser.parse()
def _get_raw_post_data(self):
if not hasattr(self, '_raw_post_data'):
if self._read_started:
raise Exception("You cannot access raw_post_data after reading from request's data stream")
try:
content_length = int(self.META.get('CONTENT_LENGTH', 0))
except (ValueError, TypeError):
# If CONTENT_LENGTH was empty string or not an integer, don't
# error out. We've also seen None passed in here (against all
# specs, but see ticket #8259), so we handle TypeError as well.
content_length = 0
if content_length:
self._raw_post_data = self.read(content_length)
else:
self._raw_post_data = self.read()
self._stream = StringIO(self._raw_post_data)
return self._raw_post_data
raw_post_data = property(_get_raw_post_data)
def _mark_post_parse_error(self):
self._post = QueryDict('')
self._files = MultiValueDict()
self._post_parse_error = True
def _load_post_and_files(self):
# Populates self._post and self._files
if self.method != 'POST':
self._post, self._files = QueryDict('', encoding=self._encoding), MultiValueDict()
return
if self._read_started and not hasattr(self, '_raw_post_data'):
self._mark_post_parse_error()
return
if self.META.get('CONTENT_TYPE', '').startswith('multipart'):
if hasattr(self, '_raw_post_data'):
# Use already read data
data = StringIO(self._raw_post_data)
else:
data = self
try:
self._post, self._files = self.parse_file_upload(self.META, data)
except:
# An error occured while parsing POST data. Since when
# formatting the error the request handler might access
# self.POST, set self._post and self._file to prevent
# attempts to parse POST data again.
# Mark that an error occured. This allows self.__repr__ to
# be explicit about it instead of simply representing an
# empty POST
self._mark_post_parse_error()
raise
else:
self._post, self._files = QueryDict(self.raw_post_data, encoding=self._encoding), MultiValueDict()
## File-like and iterator interface.
##
## Expects self._stream to be set to an appropriate source of bytes by
## a corresponding request subclass (WSGIRequest or ModPythonRequest).
## Also when request data has already been read by request.POST or
## request.raw_post_data, self._stream points to a StringIO instance
## containing that data.
def read(self, *args, **kwargs):
self._read_started = True
return self._stream.read(*args, **kwargs)
def readline(self, *args, **kwargs):
self._read_started = True
return self._stream.readline(*args, **kwargs)
def xreadlines(self):
while True:
buf = self.readline()
if not buf:
break
yield buf
__iter__ = xreadlines
def readlines(self):
return list(iter(self))
class QueryDict(MultiValueDict):
"""
A specialized MultiValueDict that takes a query string when initialized.
This is immutable unless you create a copy of it.
Values retrieved from this class are converted from the given encoding
(DEFAULT_CHARSET by default) to unicode.
"""
# These are both reset in __init__, but is specified here at the class
# level so that unpickling will have valid values
_mutable = True
_encoding = None
def __init__(self, query_string, mutable=False, encoding=None):
MultiValueDict.__init__(self)
if not encoding:
# *Important*: do not import settings any earlier because of note
# in core.handlers.modpython.
from django.conf import settings
encoding = settings.DEFAULT_CHARSET
self.encoding = encoding
for key, value in parse_qsl((query_string or ''), True): # keep_blank_values=True
self.appendlist(force_unicode(key, encoding, errors='replace'),
force_unicode(value, encoding, errors='replace'))
self._mutable = mutable
def _get_encoding(self):
if self._encoding is None:
# *Important*: do not import settings at the module level because
# of the note in core.handlers.modpython.
from django.conf import settings
self._encoding = settings.DEFAULT_CHARSET
return self._encoding
def _set_encoding(self, value):
self._encoding = value
encoding = property(_get_encoding, _set_encoding)
def _assert_mutable(self):
if not self._mutable:
raise AttributeError("This QueryDict instance is immutable")
def __setitem__(self, key, value):
self._assert_mutable()
key = str_to_unicode(key, self.encoding)
value = str_to_unicode(value, self.encoding)
MultiValueDict.__setitem__(self, key, value)
def __delitem__(self, key):
self._assert_mutable()
super(QueryDict, self).__delitem__(key)
def __copy__(self):
result = self.__class__('', mutable=True, encoding=self.encoding)
for key, value in dict.items(self):
dict.__setitem__(result, key, value)
return result
def __deepcopy__(self, memo):
import django.utils.copycompat as copy
result = self.__class__('', mutable=True, encoding=self.encoding)
memo[id(self)] = result
for key, value in dict.items(self):
dict.__setitem__(result, copy.deepcopy(key, memo), copy.deepcopy(value, memo))
return result
def setlist(self, key, list_):
self._assert_mutable()
key = str_to_unicode(key, self.encoding)
list_ = [str_to_unicode(elt, self.encoding) for elt in list_]
MultiValueDict.setlist(self, key, list_)
def setlistdefault(self, key, default_list=()):
self._assert_mutable()
if key not in self:
self.setlist(key, default_list)
return MultiValueDict.getlist(self, key)
def appendlist(self, key, value):
self._assert_mutable()
key = str_to_unicode(key, self.encoding)
value = str_to_unicode(value, self.encoding)
MultiValueDict.appendlist(self, key, value)
def update(self, other_dict):
self._assert_mutable()
f = lambda s: str_to_unicode(s, self.encoding)
if hasattr(other_dict, 'lists'):
for key, valuelist in other_dict.lists():
for value in valuelist:
MultiValueDict.update(self, {f(key): f(value)})
else:
d = dict([(f(k), f(v)) for k, v in other_dict.items()])
MultiValueDict.update(self, d)
def pop(self, key, *args):
self._assert_mutable()
return MultiValueDict.pop(self, key, *args)
def popitem(self):
self._assert_mutable()
return MultiValueDict.popitem(self)
def clear(self):
self._assert_mutable()
MultiValueDict.clear(self)
def setdefault(self, key, default=None):
self._assert_mutable()
key = str_to_unicode(key, self.encoding)
default = str_to_unicode(default, self.encoding)
return MultiValueDict.setdefault(self, key, default)
def copy(self):
"""Returns a mutable copy of this object."""
return self.__deepcopy__({})
def urlencode(self, safe=None):
"""
Returns an encoded string of all query string arguments.
:arg safe: Used to specify characters which do not require quoting, for
example::
>>> q = QueryDict('', mutable=True)
>>> q['next'] = '/a&b/'
>>> q.urlencode()
'next=%2Fa%26b%2F'
>>> q.urlencode(safe='/')
'next=/a%26b/'
"""
output = []
if safe:
encode = lambda k, v: '%s=%s' % ((quote(k, safe), quote(v, safe)))
else:
encode = lambda k, v: urlencode({k: v})
for k, list_ in self.lists():
k = smart_str(k, self.encoding)
output.extend([encode(k, smart_str(v, self.encoding))
for v in list_])
return '&'.join(output)
def parse_cookie(cookie):
if cookie == '':
return {}
if not isinstance(cookie, Cookie.BaseCookie):
try:
c = SimpleCookie()
c.load(cookie, ignore_parse_errors=True)
except Cookie.CookieError:
# Invalid cookie
return {}
else:
c = cookie
cookiedict = {}
for key in c.keys():
cookiedict[key] = c.get(key).value
return cookiedict
class BadHeaderError(ValueError):
pass
class HttpResponse(object):
"""A basic HTTP response, with content and dictionary-accessed headers."""
status_code = 200
def __init__(self, content='', mimetype=None, status=None,
content_type=None):
# _headers is a mapping of the lower-case name to the original case of
# the header (required for working with legacy systems) and the header
# value. Both the name of the header and its value are ASCII strings.
self._headers = {}
self._charset = settings.DEFAULT_CHARSET
if mimetype:
content_type = mimetype # For backwards compatibility
if not content_type:
content_type = "%s; charset=%s" % (settings.DEFAULT_CONTENT_TYPE,
self._charset)
if not isinstance(content, basestring) and hasattr(content, '__iter__'):
self._container = content
self._is_string = False
else:
self._container = [content]
self._is_string = True
self.cookies = SimpleCookie()
if status:
self.status_code = status
self['Content-Type'] = content_type
def __str__(self):
"""Full HTTP message, including headers."""
return '\n'.join(['%s: %s' % (key, value)
for key, value in self._headers.values()]) \
+ '\n\n' + self.content
def _convert_to_ascii(self, *values):
"""Converts all values to ascii strings."""
for value in values:
if isinstance(value, unicode):
try:
value = value.encode('us-ascii')
except UnicodeError, e:
e.reason += ', HTTP response headers must be in US-ASCII format'
raise
else:
value = str(value)
if '\n' in value or '\r' in value:
raise BadHeaderError("Header values can't contain newlines (got %r)" % (value))
yield value
def __setitem__(self, header, value):
header, value = self._convert_to_ascii(header, value)
self._headers[header.lower()] = (header, value)
def __delitem__(self, header):
try:
del self._headers[header.lower()]
except KeyError:
pass
def __getitem__(self, header):
return self._headers[header.lower()][1]
def has_header(self, header):
"""Case-insensitive check for a header."""
return self._headers.has_key(header.lower())
__contains__ = has_header
def items(self):
return self._headers.values()
def get(self, header, alternate):
return self._headers.get(header.lower(), (None, alternate))[1]
def set_cookie(self, key, value='', max_age=None, expires=None, path='/',
domain=None, secure=False, httponly=False):
"""
Sets a cookie.
``expires`` can be a string in the correct format or a
``datetime.datetime`` object in UTC. If ``expires`` is a datetime
object then ``max_age`` will be calculated.
"""
self.cookies[key] = value
if expires is not None:
if isinstance(expires, datetime.datetime):
delta = expires - expires.utcnow()
# Add one second so the date matches exactly (a fraction of
# time gets lost between converting to a timedelta and
# then the date string).
delta = delta + datetime.timedelta(seconds=1)
# Just set max_age - the max_age logic will set expires.
expires = None
max_age = max(0, delta.days * 86400 + delta.seconds)
else:
self.cookies[key]['expires'] = expires
if max_age is not None:
self.cookies[key]['max-age'] = max_age
# IE requires expires, so set it if hasn't been already.
if not expires:
self.cookies[key]['expires'] = cookie_date(time.time() +
max_age)
if path is not None:
self.cookies[key]['path'] = path
if domain is not None:
self.cookies[key]['domain'] = domain
if secure:
self.cookies[key]['secure'] = True
if httponly:
self.cookies[key]['httponly'] = True
def delete_cookie(self, key, path='/', domain=None):
self.set_cookie(key, max_age=0, path=path, domain=domain,
expires='Thu, 01-Jan-1970 00:00:00 GMT')
def _get_content(self):
if self.has_header('Content-Encoding'):
return ''.join(self._container)
return smart_str(''.join(self._container), self._charset)
def _set_content(self, value):
self._container = [value]
self._is_string = True
content = property(_get_content, _set_content)
def __iter__(self):
self._iterator = iter(self._container)
return self
def next(self):
chunk = self._iterator.next()
if isinstance(chunk, unicode):
chunk = chunk.encode(self._charset)
return str(chunk)
def close(self):
if hasattr(self._container, 'close'):
self._container.close()
# The remaining methods partially implement the file-like object interface.
# See http://docs.python.org/lib/bltin-file-objects.html
def write(self, content):
if not self._is_string:
raise Exception("This %s instance is not writable" % self.__class__)
self._container.append(content)
def flush(self):
pass
def tell(self):
if not self._is_string:
raise Exception("This %s instance cannot tell its position" % self.__class__)
return sum([len(chunk) for chunk in self._container])
class HttpResponseRedirectBase(HttpResponse):
allowed_schemes = ['http', 'https', 'ftp']
def __init__(self, redirect_to):
super(HttpResponseRedirectBase, self).__init__()
parsed = urlparse(redirect_to)
if parsed[0] and parsed[0] not in self.allowed_schemes:
raise SuspiciousOperation("Unsafe redirect to URL with scheme '%s'" % parsed[0])
self['Location'] = iri_to_uri(redirect_to)
class HttpResponseRedirect(HttpResponseRedirectBase):
status_code = 302
class HttpResponsePermanentRedirect(HttpResponseRedirectBase):
status_code = 301
class HttpResponseNotModified(HttpResponse):
status_code = 304
class HttpResponseBadRequest(HttpResponse):
status_code = 400
class HttpResponseNotFound(HttpResponse):
status_code = 404
class HttpResponseForbidden(HttpResponse):
status_code = 403
class HttpResponseNotAllowed(HttpResponse):
status_code = 405
def __init__(self, permitted_methods):
super(HttpResponseNotAllowed, self).__init__()
self['Allow'] = ', '.join(permitted_methods)
class HttpResponseGone(HttpResponse):
status_code = 410
class HttpResponseServerError(HttpResponse):
status_code = 500
# A backwards compatible alias for HttpRequest.get_host.
def get_host(request):
return request.get_host()
# It's neither necessary nor appropriate to use
# django.utils.encoding.smart_unicode for parsing URLs and form inputs. Thus,
# this slightly more restricted function.
def str_to_unicode(s, encoding):
"""
Converts basestring objects to unicode, using the given encoding. Illegally
encoded input characters are replaced with Unicode "unknown" codepoint
(\ufffd).
Returns any non-basestring objects without change.
"""
if isinstance(s, str):
return unicode(s, encoding, 'replace')
else:
return s
def validate_host(host, allowed_hosts):
"""
Validate the given host header value for this site.
Check that the host looks valid and matches a host or host pattern in the
given list of ``allowed_hosts``. Any pattern beginning with a period
matches a domain and all its subdomains (e.g. ``.example.com`` matches
``example.com`` and any subdomain), ``*`` matches anything, and anything
else must match exactly.
Return ``True`` for a valid host, ``False`` otherwise.
"""
# All validation is case-insensitive
host = host.lower()
# Basic sanity check
if not host_validation_re.match(host):
return False
# Validate only the domain part.
if host[-1] == ']':
# It's an IPv6 address without a port.
domain = host
else:
domain = host.rsplit(':', 1)[0]
for pattern in allowed_hosts:
pattern = pattern.lower()
match = (
pattern == '*' or
pattern.startswith('.') and (
domain.endswith(pattern) or domain == pattern[1:]
) or
pattern == domain
)
if match:
return True
return False
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