612 lines
22 KiB
Python
612 lines
22 KiB
Python
import cgi
|
|
import codecs
|
|
import copy
|
|
import re
|
|
from io import BytesIO
|
|
from itertools import chain
|
|
from urllib.parse import quote, urlencode, urljoin, urlsplit
|
|
|
|
from django.conf import settings
|
|
from django.core import signing
|
|
from django.core.exceptions import (
|
|
DisallowedHost, ImproperlyConfigured, RequestDataTooBig,
|
|
)
|
|
from django.core.files import uploadhandler
|
|
from django.http.multipartparser import MultiPartParser, MultiPartParserError
|
|
from django.utils.datastructures import (
|
|
CaseInsensitiveMapping, ImmutableList, MultiValueDict,
|
|
)
|
|
from django.utils.encoding import escape_uri_path, iri_to_uri
|
|
from django.utils.functional import cached_property
|
|
from django.utils.http import is_same_domain, limited_parse_qsl
|
|
|
|
RAISE_ERROR = object()
|
|
host_validation_re = re.compile(r"^([a-z0-9.-]+|\[[a-f0-9]*:[a-f0-9\.:]+\])(:\d+)?$")
|
|
|
|
|
|
class UnreadablePostError(OSError):
|
|
pass
|
|
|
|
|
|
class RawPostDataException(Exception):
|
|
"""
|
|
You cannot access raw_post_data from a request that has
|
|
multipart/* POST data if it has been accessed via POST,
|
|
FILES, etc..
|
|
"""
|
|
pass
|
|
|
|
|
|
class HttpRequest:
|
|
"""A basic HTTP request."""
|
|
|
|
# The encoding used in GET/POST dicts. None means use default setting.
|
|
_encoding = None
|
|
_upload_handlers = []
|
|
|
|
def __init__(self):
|
|
# WARNING: The `WSGIRequest` subclass doesn't call `super`.
|
|
# Any variable assignment made here should also happen in
|
|
# `WSGIRequest.__init__()`.
|
|
|
|
self.GET = QueryDict(mutable=True)
|
|
self.POST = QueryDict(mutable=True)
|
|
self.COOKIES = {}
|
|
self.META = {}
|
|
self.FILES = MultiValueDict()
|
|
|
|
self.path = ''
|
|
self.path_info = ''
|
|
self.method = None
|
|
self.resolver_match = None
|
|
self.content_type = None
|
|
self.content_params = None
|
|
|
|
def __repr__(self):
|
|
if self.method is None or not self.get_full_path():
|
|
return '<%s>' % self.__class__.__name__
|
|
return '<%s: %s %r>' % (self.__class__.__name__, self.method, self.get_full_path())
|
|
|
|
@cached_property
|
|
def headers(self):
|
|
return HttpHeaders(self.META)
|
|
|
|
def _set_content_type_params(self, meta):
|
|
"""Set content_type, content_params, and encoding."""
|
|
self.content_type, self.content_params = cgi.parse_header(meta.get('CONTENT_TYPE', ''))
|
|
if 'charset' in self.content_params:
|
|
try:
|
|
codecs.lookup(self.content_params['charset'])
|
|
except LookupError:
|
|
pass
|
|
else:
|
|
self.encoding = self.content_params['charset']
|
|
|
|
def _get_raw_host(self):
|
|
"""
|
|
Return the HTTP host using the environment or request headers. Skip
|
|
allowed hosts protection, so may return an insecure host.
|
|
"""
|
|
# 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 = self.get_port()
|
|
if server_port != ('443' if self.is_secure() else '80'):
|
|
host = '%s:%s' % (host, server_port)
|
|
return host
|
|
|
|
def get_host(self):
|
|
"""Return the HTTP host using the environment or request headers."""
|
|
host = self._get_raw_host()
|
|
|
|
# Allow variants of localhost if ALLOWED_HOSTS is empty and DEBUG=True.
|
|
allowed_hosts = settings.ALLOWED_HOSTS
|
|
if settings.DEBUG and not allowed_hosts:
|
|
allowed_hosts = ['localhost', '127.0.0.1', '[::1]']
|
|
|
|
domain, port = split_domain_port(host)
|
|
if domain and validate_host(domain, allowed_hosts):
|
|
return host
|
|
else:
|
|
msg = "Invalid HTTP_HOST header: %r." % host
|
|
if domain:
|
|
msg += " You may need to add %r to ALLOWED_HOSTS." % domain
|
|
else:
|
|
msg += " The domain name provided is not valid according to RFC 1034/1035."
|
|
raise DisallowedHost(msg)
|
|
|
|
def get_port(self):
|
|
"""Return the port number for the request as a string."""
|
|
if settings.USE_X_FORWARDED_PORT and 'HTTP_X_FORWARDED_PORT' in self.META:
|
|
port = self.META['HTTP_X_FORWARDED_PORT']
|
|
else:
|
|
port = self.META['SERVER_PORT']
|
|
return str(port)
|
|
|
|
def get_full_path(self, force_append_slash=False):
|
|
return self._get_full_path(self.path, force_append_slash)
|
|
|
|
def get_full_path_info(self, force_append_slash=False):
|
|
return self._get_full_path(self.path_info, force_append_slash)
|
|
|
|
def _get_full_path(self, path, force_append_slash):
|
|
# 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%s' % (
|
|
escape_uri_path(path),
|
|
'/' if force_append_slash and not path.endswith('/') else '',
|
|
('?' + iri_to_uri(self.META.get('QUERY_STRING', ''))) if self.META.get('QUERY_STRING', '') else ''
|
|
)
|
|
|
|
def get_signed_cookie(self, key, default=RAISE_ERROR, salt='', max_age=None):
|
|
"""
|
|
Attempt to return a signed cookie. If the signature fails or the
|
|
cookie has expired, raise an exception, unless the `default` argument
|
|
is provided, in which case return that value.
|
|
"""
|
|
try:
|
|
cookie_value = self.COOKIES[key]
|
|
except KeyError:
|
|
if default is not RAISE_ERROR:
|
|
return default
|
|
else:
|
|
raise
|
|
try:
|
|
value = signing.get_cookie_signer(salt=key + salt).unsign(
|
|
cookie_value, max_age=max_age)
|
|
except signing.BadSignature:
|
|
if default is not RAISE_ERROR:
|
|
return default
|
|
else:
|
|
raise
|
|
return value
|
|
|
|
def get_raw_uri(self):
|
|
"""
|
|
Return an absolute URI from variables available in this request. Skip
|
|
allowed hosts protection, so may return insecure URI.
|
|
"""
|
|
return '{scheme}://{host}{path}'.format(
|
|
scheme=self.scheme,
|
|
host=self._get_raw_host(),
|
|
path=self.get_full_path(),
|
|
)
|
|
|
|
def build_absolute_uri(self, location=None):
|
|
"""
|
|
Build an absolute URI from the location and the variables available in
|
|
this request. If no ``location`` is specified, build the absolute URI
|
|
using request.get_full_path(). If the location is absolute, convert it
|
|
to an RFC 3987 compliant URI and return it. If location is relative or
|
|
is scheme-relative (i.e., ``//example.com/``), urljoin() it to a base
|
|
URL constructed from the request variables.
|
|
"""
|
|
if location is None:
|
|
# Make it an absolute url (but schemeless and domainless) for the
|
|
# edge case that the path starts with '//'.
|
|
location = '//%s' % self.get_full_path()
|
|
bits = urlsplit(location)
|
|
if not (bits.scheme and bits.netloc):
|
|
# Handle the simple, most common case. If the location is absolute
|
|
# and a scheme or host (netloc) isn't provided, skip an expensive
|
|
# urljoin() as long as no path segments are '.' or '..'.
|
|
if (bits.path.startswith('/') and not bits.scheme and not bits.netloc and
|
|
'/./' not in bits.path and '/../' not in bits.path):
|
|
# If location starts with '//' but has no netloc, reuse the
|
|
# schema and netloc from the current request. Strip the double
|
|
# slashes and continue as if it wasn't specified.
|
|
if location.startswith('//'):
|
|
location = location[2:]
|
|
location = self._current_scheme_host + location
|
|
else:
|
|
# Join the constructed URL with the provided location, which
|
|
# allows the provided location to apply query strings to the
|
|
# base path.
|
|
location = urljoin(self._current_scheme_host + self.path, location)
|
|
return iri_to_uri(location)
|
|
|
|
@cached_property
|
|
def _current_scheme_host(self):
|
|
return '{}://{}'.format(self.scheme, self.get_host())
|
|
|
|
def _get_scheme(self):
|
|
"""
|
|
Hook for subclasses like WSGIRequest to implement. Return 'http' by
|
|
default.
|
|
"""
|
|
return 'http'
|
|
|
|
@property
|
|
def scheme(self):
|
|
if settings.SECURE_PROXY_SSL_HEADER:
|
|
try:
|
|
header, secure_value = settings.SECURE_PROXY_SSL_HEADER
|
|
except ValueError:
|
|
raise ImproperlyConfigured(
|
|
'The SECURE_PROXY_SSL_HEADER setting must be a tuple containing two values.'
|
|
)
|
|
header_value = self.META.get(header)
|
|
if header_value is not None:
|
|
return 'https' if header_value == secure_value else 'http'
|
|
return self._get_scheme()
|
|
|
|
def is_secure(self):
|
|
return self.scheme == 'https'
|
|
|
|
def is_ajax(self):
|
|
return self.META.get('HTTP_X_REQUESTED_WITH') == 'XMLHttpRequest'
|
|
|
|
@property
|
|
def encoding(self):
|
|
return self._encoding
|
|
|
|
@encoding.setter
|
|
def encoding(self, val):
|
|
"""
|
|
Set the encoding used for GET/POST accesses. If the GET or POST
|
|
dictionary has already been created, remove and recreate it 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 _initialize_handlers(self):
|
|
self._upload_handlers = [uploadhandler.load_handler(handler, self)
|
|
for handler in settings.FILE_UPLOAD_HANDLERS]
|
|
|
|
@property
|
|
def upload_handlers(self):
|
|
if not self._upload_handlers:
|
|
# If there are no upload handlers defined, initialize them from settings.
|
|
self._initialize_handlers()
|
|
return self._upload_handlers
|
|
|
|
@upload_handlers.setter
|
|
def 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 parse_file_upload(self, META, post_data):
|
|
"""Return 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()
|
|
|
|
@property
|
|
def body(self):
|
|
if not hasattr(self, '_body'):
|
|
if self._read_started:
|
|
raise RawPostDataException("You cannot access body after reading from request's data stream")
|
|
|
|
# Limit the maximum request data size that will be handled in-memory.
|
|
if (settings.DATA_UPLOAD_MAX_MEMORY_SIZE is not None and
|
|
int(self.META.get('CONTENT_LENGTH') or 0) > settings.DATA_UPLOAD_MAX_MEMORY_SIZE):
|
|
raise RequestDataTooBig('Request body exceeded settings.DATA_UPLOAD_MAX_MEMORY_SIZE.')
|
|
|
|
try:
|
|
self._body = self.read()
|
|
except OSError as e:
|
|
raise UnreadablePostError(*e.args) from e
|
|
self._stream = BytesIO(self._body)
|
|
return self._body
|
|
|
|
def _mark_post_parse_error(self):
|
|
self._post = QueryDict()
|
|
self._files = MultiValueDict()
|
|
|
|
def _load_post_and_files(self):
|
|
"""Populate self._post and self._files if the content-type is a form type"""
|
|
if self.method != 'POST':
|
|
self._post, self._files = QueryDict(encoding=self._encoding), MultiValueDict()
|
|
return
|
|
if self._read_started and not hasattr(self, '_body'):
|
|
self._mark_post_parse_error()
|
|
return
|
|
|
|
if self.content_type == 'multipart/form-data':
|
|
if hasattr(self, '_body'):
|
|
# Use already read data
|
|
data = BytesIO(self._body)
|
|
else:
|
|
data = self
|
|
try:
|
|
self._post, self._files = self.parse_file_upload(self.META, data)
|
|
except MultiPartParserError:
|
|
# An error occurred 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.
|
|
self._mark_post_parse_error()
|
|
raise
|
|
elif self.content_type == 'application/x-www-form-urlencoded':
|
|
self._post, self._files = QueryDict(self.body, encoding=self._encoding), MultiValueDict()
|
|
else:
|
|
self._post, self._files = QueryDict(encoding=self._encoding), MultiValueDict()
|
|
|
|
def close(self):
|
|
if hasattr(self, '_files'):
|
|
for f in chain.from_iterable(l[1] for l in self._files.lists()):
|
|
f.close()
|
|
|
|
# File-like and iterator interface.
|
|
#
|
|
# Expects self._stream to be set to an appropriate source of bytes by
|
|
# a corresponding request subclass (e.g. WSGIRequest).
|
|
# Also when request data has already been read by request.POST or
|
|
# request.body, self._stream points to a BytesIO instance
|
|
# containing that data.
|
|
|
|
def read(self, *args, **kwargs):
|
|
self._read_started = True
|
|
try:
|
|
return self._stream.read(*args, **kwargs)
|
|
except OSError as e:
|
|
raise UnreadablePostError(*e.args) from e
|
|
|
|
def readline(self, *args, **kwargs):
|
|
self._read_started = True
|
|
try:
|
|
return self._stream.readline(*args, **kwargs)
|
|
except OSError as e:
|
|
raise UnreadablePostError(*e.args) from e
|
|
|
|
def __iter__(self):
|
|
return iter(self.readline, b'')
|
|
|
|
def readlines(self):
|
|
return list(self)
|
|
|
|
|
|
class HttpHeaders(CaseInsensitiveMapping):
|
|
HTTP_PREFIX = 'HTTP_'
|
|
# PEP 333 gives two headers which aren't prepended with HTTP_.
|
|
UNPREFIXED_HEADERS = {'CONTENT_TYPE', 'CONTENT_LENGTH'}
|
|
|
|
def __init__(self, environ):
|
|
headers = {}
|
|
for header, value in environ.items():
|
|
name = self.parse_header_name(header)
|
|
if name:
|
|
headers[name] = value
|
|
super().__init__(headers)
|
|
|
|
def __getitem__(self, key):
|
|
"""Allow header lookup using underscores in place of hyphens."""
|
|
return super().__getitem__(key.replace('_', '-'))
|
|
|
|
@classmethod
|
|
def parse_header_name(cls, header):
|
|
if header.startswith(cls.HTTP_PREFIX):
|
|
header = header[len(cls.HTTP_PREFIX):]
|
|
elif header not in cls.UNPREFIXED_HEADERS:
|
|
return None
|
|
return header.replace('_', '-').title()
|
|
|
|
|
|
class QueryDict(MultiValueDict):
|
|
"""
|
|
A specialized MultiValueDict which represents a query string.
|
|
|
|
A QueryDict can be used to represent GET or POST data. It subclasses
|
|
MultiValueDict since keys in such data can be repeated, for instance
|
|
in the data from a form with a <select multiple> field.
|
|
|
|
By default QueryDicts are immutable, though the copy() method
|
|
will always return a mutable copy.
|
|
|
|
Both keys and values set on this class are converted from the given encoding
|
|
(DEFAULT_CHARSET by default) to str.
|
|
"""
|
|
|
|
# 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=None, mutable=False, encoding=None):
|
|
super().__init__()
|
|
self.encoding = encoding or settings.DEFAULT_CHARSET
|
|
query_string = query_string or ''
|
|
parse_qsl_kwargs = {
|
|
'keep_blank_values': True,
|
|
'fields_limit': settings.DATA_UPLOAD_MAX_NUMBER_FIELDS,
|
|
'encoding': self.encoding,
|
|
}
|
|
if isinstance(query_string, bytes):
|
|
# query_string normally contains URL-encoded data, a subset of ASCII.
|
|
try:
|
|
query_string = query_string.decode(self.encoding)
|
|
except UnicodeDecodeError:
|
|
# ... but some user agents are misbehaving :-(
|
|
query_string = query_string.decode('iso-8859-1')
|
|
for key, value in limited_parse_qsl(query_string, **parse_qsl_kwargs):
|
|
self.appendlist(key, value)
|
|
self._mutable = mutable
|
|
|
|
@classmethod
|
|
def fromkeys(cls, iterable, value='', mutable=False, encoding=None):
|
|
"""
|
|
Return a new QueryDict with keys (may be repeated) from an iterable and
|
|
values from value.
|
|
"""
|
|
q = cls('', mutable=True, encoding=encoding)
|
|
for key in iterable:
|
|
q.appendlist(key, value)
|
|
if not mutable:
|
|
q._mutable = False
|
|
return q
|
|
|
|
@property
|
|
def encoding(self):
|
|
if self._encoding is None:
|
|
self._encoding = settings.DEFAULT_CHARSET
|
|
return self._encoding
|
|
|
|
@encoding.setter
|
|
def encoding(self, value):
|
|
self._encoding = value
|
|
|
|
def _assert_mutable(self):
|
|
if not self._mutable:
|
|
raise AttributeError("This QueryDict instance is immutable")
|
|
|
|
def __setitem__(self, key, value):
|
|
self._assert_mutable()
|
|
key = bytes_to_text(key, self.encoding)
|
|
value = bytes_to_text(value, self.encoding)
|
|
super().__setitem__(key, value)
|
|
|
|
def __delitem__(self, key):
|
|
self._assert_mutable()
|
|
super().__delitem__(key)
|
|
|
|
def __copy__(self):
|
|
result = self.__class__('', mutable=True, encoding=self.encoding)
|
|
for key, value in self.lists():
|
|
result.setlist(key, value)
|
|
return result
|
|
|
|
def __deepcopy__(self, memo):
|
|
result = self.__class__('', mutable=True, encoding=self.encoding)
|
|
memo[id(self)] = result
|
|
for key, value in self.lists():
|
|
result.setlist(copy.deepcopy(key, memo), copy.deepcopy(value, memo))
|
|
return result
|
|
|
|
def setlist(self, key, list_):
|
|
self._assert_mutable()
|
|
key = bytes_to_text(key, self.encoding)
|
|
list_ = [bytes_to_text(elt, self.encoding) for elt in list_]
|
|
super().setlist(key, list_)
|
|
|
|
def setlistdefault(self, key, default_list=None):
|
|
self._assert_mutable()
|
|
return super().setlistdefault(key, default_list)
|
|
|
|
def appendlist(self, key, value):
|
|
self._assert_mutable()
|
|
key = bytes_to_text(key, self.encoding)
|
|
value = bytes_to_text(value, self.encoding)
|
|
super().appendlist(key, value)
|
|
|
|
def pop(self, key, *args):
|
|
self._assert_mutable()
|
|
return super().pop(key, *args)
|
|
|
|
def popitem(self):
|
|
self._assert_mutable()
|
|
return super().popitem()
|
|
|
|
def clear(self):
|
|
self._assert_mutable()
|
|
super().clear()
|
|
|
|
def setdefault(self, key, default=None):
|
|
self._assert_mutable()
|
|
key = bytes_to_text(key, self.encoding)
|
|
default = bytes_to_text(default, self.encoding)
|
|
return super().setdefault(key, default)
|
|
|
|
def copy(self):
|
|
"""Return a mutable copy of this object."""
|
|
return self.__deepcopy__({})
|
|
|
|
def urlencode(self, safe=None):
|
|
"""
|
|
Return an encoded string of all query string arguments.
|
|
|
|
`safe` specifies characters which don't 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:
|
|
safe = safe.encode(self.encoding)
|
|
|
|
def encode(k, v):
|
|
return '%s=%s' % ((quote(k, safe), quote(v, safe)))
|
|
else:
|
|
def encode(k, v):
|
|
return urlencode({k: v})
|
|
for k, list_ in self.lists():
|
|
output.extend(
|
|
encode(k.encode(self.encoding), str(v).encode(self.encoding))
|
|
for v in list_
|
|
)
|
|
return '&'.join(output)
|
|
|
|
|
|
# It's neither necessary nor appropriate to use
|
|
# django.utils.encoding.force_str() for parsing URLs and form inputs. Thus,
|
|
# this slightly more restricted function, used by QueryDict.
|
|
def bytes_to_text(s, encoding):
|
|
"""
|
|
Convert bytes objects to strings, using the given encoding. Illegally
|
|
encoded input characters are replaced with Unicode "unknown" codepoint
|
|
(\ufffd).
|
|
|
|
Return any non-bytes objects without change.
|
|
"""
|
|
if isinstance(s, bytes):
|
|
return str(s, encoding, 'replace')
|
|
else:
|
|
return s
|
|
|
|
|
|
def split_domain_port(host):
|
|
"""
|
|
Return a (domain, port) tuple from a given host.
|
|
|
|
Returned domain is lowercased. If the host is invalid, the domain will be
|
|
empty.
|
|
"""
|
|
host = host.lower()
|
|
|
|
if not host_validation_re.match(host):
|
|
return '', ''
|
|
|
|
if host[-1] == ']':
|
|
# It's an IPv6 address without a port.
|
|
return host, ''
|
|
bits = host.rsplit(':', 1)
|
|
domain, port = bits if len(bits) == 2 else (bits[0], '')
|
|
# Remove a trailing dot (if present) from the domain.
|
|
domain = domain[:-1] if domain.endswith('.') else domain
|
|
return domain, port
|
|
|
|
|
|
def validate_host(host, allowed_hosts):
|
|
"""
|
|
Validate the given host 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.
|
|
|
|
Note: This function assumes that the given host is lowercased and has
|
|
already had the port, if any, stripped off.
|
|
|
|
Return ``True`` for a valid host, ``False`` otherwise.
|
|
"""
|
|
return any(pattern == '*' or is_same_domain(host, pattern) for pattern in allowed_hosts)
|