598 lines
21 KiB
Python
598 lines
21 KiB
Python
import copy
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import re
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from io import BytesIO
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from itertools import chain
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from urllib.parse import quote, urlencode, urljoin, urlsplit
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from django.conf import settings
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from django.core import signing
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from django.core.exceptions import (
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DisallowedHost, ImproperlyConfigured, RequestDataTooBig,
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)
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from django.core.files import uploadhandler
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from django.http.multipartparser import MultiPartParser, MultiPartParserError
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from django.utils.datastructures import (
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CaseInsensitiveMapping, ImmutableList, MultiValueDict,
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)
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from django.utils.encoding import escape_uri_path, iri_to_uri
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from django.utils.functional import cached_property
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from django.utils.http import is_same_domain, limited_parse_qsl
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RAISE_ERROR = object()
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host_validation_re = re.compile(r"^([a-z0-9.-]+|\[[a-f0-9]*:[a-f0-9\.:]+\])(:\d+)?$")
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class UnreadablePostError(OSError):
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pass
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class RawPostDataException(Exception):
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"""
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You cannot access raw_post_data from a request that has
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multipart/* POST data if it has been accessed via POST,
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FILES, etc..
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"""
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pass
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class HttpRequest:
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"""A basic HTTP request."""
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# The encoding used in GET/POST dicts. None means use default setting.
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_encoding = None
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_upload_handlers = []
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def __init__(self):
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# WARNING: The `WSGIRequest` subclass doesn't call `super`.
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# Any variable assignment made here should also happen in
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# `WSGIRequest.__init__()`.
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self.GET = QueryDict(mutable=True)
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self.POST = QueryDict(mutable=True)
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self.COOKIES = {}
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self.META = {}
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self.FILES = MultiValueDict()
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self.path = ''
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self.path_info = ''
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self.method = None
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self.resolver_match = None
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self.content_type = None
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self.content_params = None
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def __repr__(self):
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if self.method is None or not self.get_full_path():
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return '<%s>' % self.__class__.__name__
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return '<%s: %s %r>' % (self.__class__.__name__, self.method, self.get_full_path())
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@cached_property
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def headers(self):
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return HttpHeaders(self.META)
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def _get_raw_host(self):
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"""
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Return the HTTP host using the environment or request headers. Skip
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allowed hosts protection, so may return an insecure host.
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"""
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# We try three options, in order of decreasing preference.
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if settings.USE_X_FORWARDED_HOST and (
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'HTTP_X_FORWARDED_HOST' in self.META):
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host = self.META['HTTP_X_FORWARDED_HOST']
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elif 'HTTP_HOST' in self.META:
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host = self.META['HTTP_HOST']
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else:
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# Reconstruct the host using the algorithm from PEP 333.
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host = self.META['SERVER_NAME']
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server_port = self.get_port()
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if server_port != ('443' if self.is_secure() else '80'):
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host = '%s:%s' % (host, server_port)
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return host
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def get_host(self):
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"""Return the HTTP host using the environment or request headers."""
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host = self._get_raw_host()
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# Allow variants of localhost if ALLOWED_HOSTS is empty and DEBUG=True.
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allowed_hosts = settings.ALLOWED_HOSTS
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if settings.DEBUG and not allowed_hosts:
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allowed_hosts = ['localhost', '127.0.0.1', '[::1]']
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domain, port = split_domain_port(host)
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if domain and validate_host(domain, allowed_hosts):
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return host
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else:
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msg = "Invalid HTTP_HOST header: %r." % host
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if domain:
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msg += " You may need to add %r to ALLOWED_HOSTS." % domain
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else:
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msg += " The domain name provided is not valid according to RFC 1034/1035."
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raise DisallowedHost(msg)
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def get_port(self):
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"""Return the port number for the request as a string."""
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if settings.USE_X_FORWARDED_PORT and 'HTTP_X_FORWARDED_PORT' in self.META:
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port = self.META['HTTP_X_FORWARDED_PORT']
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else:
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port = self.META['SERVER_PORT']
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return str(port)
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def get_full_path(self, force_append_slash=False):
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return self._get_full_path(self.path, force_append_slash)
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def get_full_path_info(self, force_append_slash=False):
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return self._get_full_path(self.path_info, force_append_slash)
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def _get_full_path(self, path, force_append_slash):
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# RFC 3986 requires query string arguments to be in the ASCII range.
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# Rather than crash if this doesn't happen, we encode defensively.
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return '%s%s%s' % (
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escape_uri_path(path),
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'/' if force_append_slash and not path.endswith('/') else '',
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('?' + iri_to_uri(self.META.get('QUERY_STRING', ''))) if self.META.get('QUERY_STRING', '') else ''
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)
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def get_signed_cookie(self, key, default=RAISE_ERROR, salt='', max_age=None):
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"""
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Attempt to return a signed cookie. If the signature fails or the
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cookie has expired, raise an exception, unless the `default` argument
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is provided, in which case return that value.
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"""
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try:
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cookie_value = self.COOKIES[key]
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except KeyError:
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if default is not RAISE_ERROR:
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return default
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else:
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raise
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try:
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value = signing.get_cookie_signer(salt=key + salt).unsign(
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cookie_value, max_age=max_age)
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except signing.BadSignature:
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if default is not RAISE_ERROR:
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return default
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else:
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raise
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return value
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def get_raw_uri(self):
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"""
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Return an absolute URI from variables available in this request. Skip
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allowed hosts protection, so may return insecure URI.
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"""
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return '{scheme}://{host}{path}'.format(
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scheme=self.scheme,
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host=self._get_raw_host(),
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path=self.get_full_path(),
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)
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def build_absolute_uri(self, location=None):
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"""
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Build an absolute URI from the location and the variables available in
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this request. If no ``location`` is specified, build the absolute URI
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using request.get_full_path(). If the location is absolute, convert it
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to an RFC 3987 compliant URI and return it. If location is relative or
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is scheme-relative (i.e., ``//example.com/``), urljoin() it to a base
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URL constructed from the request variables.
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"""
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if location is None:
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# Make it an absolute url (but schemeless and domainless) for the
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# edge case that the path starts with '//'.
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location = '//%s' % self.get_full_path()
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bits = urlsplit(location)
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if not (bits.scheme and bits.netloc):
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# Handle the simple, most common case. If the location is absolute
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# and a scheme or host (netloc) isn't provided, skip an expensive
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# urljoin() as long as no path segments are '.' or '..'.
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if (bits.path.startswith('/') and not bits.scheme and not bits.netloc and
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'/./' not in bits.path and '/../' not in bits.path):
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# If location starts with '//' but has no netloc, reuse the
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# schema and netloc from the current request. Strip the double
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# slashes and continue as if it wasn't specified.
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if location.startswith('//'):
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location = location[2:]
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location = self._current_scheme_host + location
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else:
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# Join the constructed URL with the provided location, which
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# allows the provided location to apply query strings to the
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# base path.
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location = urljoin(self._current_scheme_host + self.path, location)
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return iri_to_uri(location)
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@cached_property
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def _current_scheme_host(self):
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return '{}://{}'.format(self.scheme, self.get_host())
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def _get_scheme(self):
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"""
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Hook for subclasses like WSGIRequest to implement. Return 'http' by
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default.
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"""
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return 'http'
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@property
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def scheme(self):
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if settings.SECURE_PROXY_SSL_HEADER:
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try:
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header, value = settings.SECURE_PROXY_SSL_HEADER
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except ValueError:
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raise ImproperlyConfigured(
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'The SECURE_PROXY_SSL_HEADER setting must be a tuple containing two values.'
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)
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if self.META.get(header) == value:
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return 'https'
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return self._get_scheme()
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def is_secure(self):
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return self.scheme == 'https'
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def is_ajax(self):
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return self.META.get('HTTP_X_REQUESTED_WITH') == 'XMLHttpRequest'
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@property
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def encoding(self):
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return self._encoding
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@encoding.setter
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def encoding(self, val):
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"""
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Set the encoding used for GET/POST accesses. If the GET or POST
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dictionary has already been created, remove and recreate it on the
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next access (so that it is decoded correctly).
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"""
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self._encoding = val
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if hasattr(self, 'GET'):
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del self.GET
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if hasattr(self, '_post'):
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del self._post
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def _initialize_handlers(self):
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self._upload_handlers = [uploadhandler.load_handler(handler, self)
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for handler in settings.FILE_UPLOAD_HANDLERS]
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@property
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def upload_handlers(self):
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if not self._upload_handlers:
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# If there are no upload handlers defined, initialize them from settings.
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self._initialize_handlers()
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return self._upload_handlers
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@upload_handlers.setter
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def upload_handlers(self, upload_handlers):
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if hasattr(self, '_files'):
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raise AttributeError("You cannot set the upload handlers after the upload has been processed.")
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self._upload_handlers = upload_handlers
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def parse_file_upload(self, META, post_data):
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"""Return a tuple of (POST QueryDict, FILES MultiValueDict)."""
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self.upload_handlers = ImmutableList(
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self.upload_handlers,
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warning="You cannot alter upload handlers after the upload has been processed."
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)
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parser = MultiPartParser(META, post_data, self.upload_handlers, self.encoding)
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return parser.parse()
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@property
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def body(self):
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if not hasattr(self, '_body'):
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if self._read_started:
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raise RawPostDataException("You cannot access body after reading from request's data stream")
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# Limit the maximum request data size that will be handled in-memory.
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if (settings.DATA_UPLOAD_MAX_MEMORY_SIZE is not None and
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int(self.META.get('CONTENT_LENGTH') or 0) > settings.DATA_UPLOAD_MAX_MEMORY_SIZE):
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raise RequestDataTooBig('Request body exceeded settings.DATA_UPLOAD_MAX_MEMORY_SIZE.')
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try:
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self._body = self.read()
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except OSError as e:
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raise UnreadablePostError(*e.args) from e
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self._stream = BytesIO(self._body)
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return self._body
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def _mark_post_parse_error(self):
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self._post = QueryDict()
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self._files = MultiValueDict()
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def _load_post_and_files(self):
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"""Populate self._post and self._files if the content-type is a form type"""
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if self.method != 'POST':
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self._post, self._files = QueryDict(encoding=self._encoding), MultiValueDict()
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return
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if self._read_started and not hasattr(self, '_body'):
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self._mark_post_parse_error()
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return
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if self.content_type == 'multipart/form-data':
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if hasattr(self, '_body'):
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# Use already read data
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data = BytesIO(self._body)
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else:
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data = self
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try:
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self._post, self._files = self.parse_file_upload(self.META, data)
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except MultiPartParserError:
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# An error occurred while parsing POST data. Since when
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# formatting the error the request handler might access
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# self.POST, set self._post and self._file to prevent
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# attempts to parse POST data again.
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self._mark_post_parse_error()
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raise
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elif self.content_type == 'application/x-www-form-urlencoded':
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self._post, self._files = QueryDict(self.body, encoding=self._encoding), MultiValueDict()
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else:
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self._post, self._files = QueryDict(encoding=self._encoding), MultiValueDict()
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def close(self):
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if hasattr(self, '_files'):
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for f in chain.from_iterable(l[1] for l in self._files.lists()):
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f.close()
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# File-like and iterator interface.
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#
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# Expects self._stream to be set to an appropriate source of bytes by
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# a corresponding request subclass (e.g. WSGIRequest).
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# Also when request data has already been read by request.POST or
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# request.body, self._stream points to a BytesIO instance
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# containing that data.
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def read(self, *args, **kwargs):
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self._read_started = True
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try:
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return self._stream.read(*args, **kwargs)
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except OSError as e:
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raise UnreadablePostError(*e.args) from e
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def readline(self, *args, **kwargs):
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self._read_started = True
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try:
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return self._stream.readline(*args, **kwargs)
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except OSError as e:
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raise UnreadablePostError(*e.args) from e
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def __iter__(self):
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return iter(self.readline, b'')
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def readlines(self):
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return list(self)
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class HttpHeaders(CaseInsensitiveMapping):
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HTTP_PREFIX = 'HTTP_'
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# PEP 333 gives two headers which aren't prepended with HTTP_.
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UNPREFIXED_HEADERS = {'CONTENT_TYPE', 'CONTENT_LENGTH'}
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def __init__(self, environ):
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headers = {}
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for header, value in environ.items():
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name = self.parse_header_name(header)
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if name:
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headers[name] = value
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super().__init__(headers)
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def __getitem__(self, key):
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"""Allow header lookup using underscores in place of hyphens."""
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return super().__getitem__(key.replace('_', '-'))
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@classmethod
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def parse_header_name(cls, header):
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if header.startswith(cls.HTTP_PREFIX):
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header = header[len(cls.HTTP_PREFIX):]
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elif header not in cls.UNPREFIXED_HEADERS:
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return None
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return header.replace('_', '-').title()
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class QueryDict(MultiValueDict):
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"""
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A specialized MultiValueDict which represents a query string.
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A QueryDict can be used to represent GET or POST data. It subclasses
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MultiValueDict since keys in such data can be repeated, for instance
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in the data from a form with a <select multiple> field.
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By default QueryDicts are immutable, though the copy() method
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will always return a mutable copy.
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Both keys and values set on this class are converted from the given encoding
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(DEFAULT_CHARSET by default) to str.
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"""
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# These are both reset in __init__, but is specified here at the class
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# level so that unpickling will have valid values
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_mutable = True
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_encoding = None
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def __init__(self, query_string=None, mutable=False, encoding=None):
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super().__init__()
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self.encoding = encoding or settings.DEFAULT_CHARSET
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query_string = query_string or ''
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parse_qsl_kwargs = {
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'keep_blank_values': True,
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'fields_limit': settings.DATA_UPLOAD_MAX_NUMBER_FIELDS,
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'encoding': self.encoding,
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}
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if isinstance(query_string, bytes):
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# query_string normally contains URL-encoded data, a subset of ASCII.
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try:
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query_string = query_string.decode(self.encoding)
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except UnicodeDecodeError:
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# ... but some user agents are misbehaving :-(
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query_string = query_string.decode('iso-8859-1')
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for key, value in limited_parse_qsl(query_string, **parse_qsl_kwargs):
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self.appendlist(key, value)
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self._mutable = mutable
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@classmethod
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def fromkeys(cls, iterable, value='', mutable=False, encoding=None):
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"""
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Return a new QueryDict with keys (may be repeated) from an iterable and
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values from value.
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"""
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q = cls('', mutable=True, encoding=encoding)
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for key in iterable:
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q.appendlist(key, value)
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if not mutable:
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q._mutable = False
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return q
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@property
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def encoding(self):
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if self._encoding is None:
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self._encoding = settings.DEFAULT_CHARSET
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return self._encoding
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@encoding.setter
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def encoding(self, value):
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self._encoding = value
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def _assert_mutable(self):
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if not self._mutable:
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raise AttributeError("This QueryDict instance is immutable")
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def __setitem__(self, key, value):
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self._assert_mutable()
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key = bytes_to_text(key, self.encoding)
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value = bytes_to_text(value, self.encoding)
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super().__setitem__(key, value)
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def __delitem__(self, key):
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self._assert_mutable()
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super().__delitem__(key)
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def __copy__(self):
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result = self.__class__('', mutable=True, encoding=self.encoding)
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for key, value in self.lists():
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result.setlist(key, value)
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return result
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def __deepcopy__(self, memo):
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result = self.__class__('', mutable=True, encoding=self.encoding)
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memo[id(self)] = result
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for key, value in self.lists():
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result.setlist(copy.deepcopy(key, memo), copy.deepcopy(value, memo))
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return result
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def setlist(self, key, list_):
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self._assert_mutable()
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key = bytes_to_text(key, self.encoding)
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list_ = [bytes_to_text(elt, self.encoding) for elt in list_]
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super().setlist(key, list_)
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def setlistdefault(self, key, default_list=None):
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self._assert_mutable()
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return super().setlistdefault(key, default_list)
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def appendlist(self, key, value):
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self._assert_mutable()
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key = bytes_to_text(key, self.encoding)
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value = bytes_to_text(value, self.encoding)
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super().appendlist(key, value)
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def pop(self, key, *args):
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self._assert_mutable()
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return super().pop(key, *args)
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def popitem(self):
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self._assert_mutable()
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return super().popitem()
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def clear(self):
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self._assert_mutable()
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super().clear()
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def setdefault(self, key, default=None):
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self._assert_mutable()
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key = bytes_to_text(key, self.encoding)
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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)
|