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Source code for django.http.request

from __future__ import unicode_literals

import copy
import os
import re
import sys
from io import BytesIO
from itertools import chain
from pprint import pformat

from django.conf import settings
from django.core import signing
from django.core.exceptions import DisallowedHost, ImproperlyConfigured
from django.core.files import uploadhandler
from django.http.multipartparser import MultiPartParser, MultiPartParserError
from django.utils import six
from django.utils.datastructures import ImmutableList, MultiValueDict
from django.utils.encoding import (
    escape_uri_path, force_bytes, force_str, force_text, iri_to_uri,
from django.utils.six.moves.urllib.parse import (
    parse_qsl, quote, urlencode, urljoin, urlsplit,

RAISE_ERROR = object()
host_validation_re = re.compile(r"^([a-z0-9.-]+|\[[a-f0-9]*:[a-f0-9:]+\])(:\d+)?$")

[docs]class UnreadablePostError(IOError): 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
[docs]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): # 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._post_parse_error = False def __repr__(self): if self.method is None or not self.get_full_path(): return force_str('<%s>' % self.__class__.__name__) return force_str( '<%s: %s %r>' % (self.__class__.__name__, self.method, force_str(self.get_full_path())) )
[docs] 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 != ('443' if self.is_secure() else '80'): host = '%s:%s' % (host, server_port) # 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', '', '[::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)
[docs] 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' % ( escape_uri_path(self.path), ('?' + iri_to_uri(self.META.get('QUERY_STRING', ''))) if self.META.get('QUERY_STRING', '') else '' )
[docs] 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()``. Anyway, if the location is absolute, it is simply converted to an RFC 3987 compliant URI and returned and if location is relative or is scheme-relative (i.e., ``//example.com/``), it is urljoined 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): current_uri = '{scheme}://{host}{path}'.format(scheme=self.scheme, host=self.get_host(), path=self.path) # Join the constructed URL with the provided location, which will # allow the provided ``location`` to apply query strings to the # base path as well as override the host, if it begins with // location = urljoin(current_uri, location) return iri_to_uri(location)
def _get_scheme(self): return 'https' if os.environ.get("HTTPS") == "on" else 'http' @property def scheme(self): # First, check the SECURE_PROXY_SSL_HEADER setting. if settings.SECURE_PROXY_SSL_HEADER: try: header, value = settings.SECURE_PROXY_SSL_HEADER except ValueError: raise ImproperlyConfigured( 'The SECURE_PROXY_SSL_HEADER setting must be a tuple containing two values.' ) if self.META.get(header, None) == value: return 'https' # Failing that, fall back to _get_scheme(), which is a hook for # subclasses to implement. return self._get_scheme()
[docs] def is_secure(self): return self.scheme == 'https'
[docs] 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): """ 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 _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): """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() @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") try: self._body = self.read() except IOError as e: six.reraise(UnreadablePostError, UnreadablePostError(*e.args), sys.exc_info()[2]) self._stream = BytesIO(self._body) return self._body def _mark_post_parse_error(self): self._post = QueryDict('') self._files = MultiValueDict() self._post_parse_error = True 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.META.get('CONTENT_TYPE', '').startswith('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. # Mark that an error occurred. This allows self.__repr__ to # be explicit about it instead of simply representing an # empty POST self._mark_post_parse_error() raise elif self.META.get('CONTENT_TYPE', '').startswith('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.
[docs] def read(self, *args, **kwargs): self._read_started = True try: return self._stream.read(*args, **kwargs) except IOError as e: six.reraise(UnreadablePostError, UnreadablePostError(*e.args), sys.exc_info()[2])
[docs] def readline(self, *args, **kwargs): self._read_started = True try: return self._stream.readline(*args, **kwargs) except IOError as e: six.reraise(UnreadablePostError, UnreadablePostError(*e.args), sys.exc_info()[2])
[docs] def xreadlines(self): while True: buf = self.readline() if not buf: break yield buf
__iter__ = xreadlines
[docs] def readlines(self): return list(iter(self))
[docs]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 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
[docs] def __init__(self, query_string=None, mutable=False, encoding=None): super(QueryDict, self).__init__() if not encoding: encoding = settings.DEFAULT_CHARSET self.encoding = encoding if six.PY3: if isinstance(query_string, bytes): # query_string normally contains URL-encoded data, a subset of ASCII. try: query_string = query_string.decode(encoding) except UnicodeDecodeError: # ... but some user agents are misbehaving :-( query_string = query_string.decode('iso-8859-1') for key, value in parse_qsl(query_string or '', keep_blank_values=True, encoding=encoding): self.appendlist(key, value) else: for key, value in parse_qsl(query_string or '', keep_blank_values=True): try: value = value.decode(encoding) except UnicodeDecodeError: value = value.decode('iso-8859-1') self.appendlist(force_text(key, encoding, errors='replace'), value) self._mutable = mutable
@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")
[docs] def __setitem__(self, key, value): self._assert_mutable() key = bytes_to_text(key, self.encoding) value = bytes_to_text(value, self.encoding) super(QueryDict, self).__setitem__(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 six.iterlists(self): 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 six.iterlists(self): result.setlist(copy.deepcopy(key, memo), copy.deepcopy(value, memo)) return result
[docs] 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(QueryDict, self).setlist(key, list_)
[docs] def setlistdefault(self, key, default_list=None): self._assert_mutable() return super(QueryDict, self).setlistdefault(key, default_list)
[docs] def appendlist(self, key, value): self._assert_mutable() key = bytes_to_text(key, self.encoding) value = bytes_to_text(value, self.encoding) super(QueryDict, self).appendlist(key, value)
[docs] def pop(self, key, *args): self._assert_mutable() return super(QueryDict, self).pop(key, *args)
[docs] def popitem(self): self._assert_mutable() return super(QueryDict, self).popitem()
def clear(self): self._assert_mutable() super(QueryDict, self).clear()
[docs] 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(QueryDict, self).setdefault(key, default)
[docs] def copy(self): """Returns a mutable copy of this object.""" return self.__deepcopy__({})
[docs] 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: safe = force_bytes(safe, self.encoding) 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 = force_bytes(k, self.encoding) output.extend(encode(k, force_bytes(v, self.encoding)) for v in list_) return '&'.join(output)
def build_request_repr(request, path_override=None, GET_override=None, POST_override=None, COOKIES_override=None, META_override=None): """ Builds and returns the request's representation string. The request's attributes may be overridden by pre-processed values. """ # Since this is called as part of error handling, we need to be very # robust against potentially malformed input. try: get = (pformat(GET_override) if GET_override is not None else pformat(request.GET)) except Exception: get = '<could not parse>' if request._post_parse_error: post = '<could not parse>' else: try: post = (pformat(POST_override) if POST_override is not None else pformat(request.POST)) except Exception: post = '<could not parse>' try: cookies = (pformat(COOKIES_override) if COOKIES_override is not None else pformat(request.COOKIES)) except Exception: cookies = '<could not parse>' try: meta = (pformat(META_override) if META_override is not None else pformat(request.META)) except Exception: meta = '<could not parse>' path = path_override if path_override is not None else request.path return force_str('<%s\npath:%s,\nGET:%s,\nPOST:%s,\nCOOKIES:%s,\nMETA:%s>' % (request.__class__.__name__, path, six.text_type(get), six.text_type(post), six.text_type(cookies), six.text_type(meta))) # It's neither necessary nor appropriate to use # django.utils.encoding.smart_text for parsing URLs and form inputs. Thus, # this slightly more restricted function, used by QueryDict. def bytes_to_text(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, bytes): return six.text_type(s, encoding, 'replace') else: return s def split_domain_port(host): """ Return a (domain, port) tuple from a given host. Returned domain is lower-cased. 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) if len(bits) == 2: return tuple(bits) return bits[0], '' 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 lower-cased and has already had the port, if any, stripped off. Return ``True`` for a valid host, ``False`` otherwise. """ host = host[:-1] if host.endswith('.') else host for pattern in allowed_hosts: pattern = pattern.lower() match = ( pattern == '*' or pattern.startswith('.') and ( host.endswith(pattern) or host == pattern[1:] ) or pattern == host ) if match: return True return False
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