497 lines
17 KiB
Python
497 lines
17 KiB
Python
import os
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import re
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from Cookie import BaseCookie, SimpleCookie, CookieError
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from pprint import pformat
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from urllib import urlencode
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from urlparse import urljoin
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try:
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# The mod_python version is more efficient, so try importing it first.
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from mod_python.util import parse_qsl
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except ImportError:
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from cgi import parse_qsl
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from django.utils.datastructures import MultiValueDict, ImmutableList
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from django.utils.encoding import smart_str, iri_to_uri, force_unicode
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from django.http.multipartparser import MultiPartParser
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from django.conf import settings
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from django.core.files import uploadhandler
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from utils import *
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RESERVED_CHARS="!*'();:@&=+$,/?%#[]"
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absolute_http_url_re = re.compile(r"^https?://", re.I)
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class Http404(Exception):
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pass
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class HttpRequest(object):
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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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self.GET, self.POST, self.COOKIES, self.META, self.FILES = {}, {}, {}, {}, {}
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self.path = ''
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self.path_info = ''
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self.method = None
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def __repr__(self):
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return '<HttpRequest\nGET:%s,\nPOST:%s,\nCOOKIES:%s,\nMETA:%s>' % \
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(pformat(self.GET), pformat(self.POST), pformat(self.COOKIES),
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pformat(self.META))
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def get_host(self):
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"""Returns the HTTP host using the environment or request headers."""
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# We try three options, in order of decreasing preference.
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if '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 = str(self.META['SERVER_PORT'])
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if server_port != (self.is_secure() and '443' or '80'):
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host = '%s:%s' % (host, server_port)
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return host
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def get_full_path(self):
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return ''
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def build_absolute_uri(self, location=None):
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"""
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Builds an absolute URI from the location and the variables available in
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this request. If no location is specified, the absolute URI is built on
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``request.get_full_path()``.
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"""
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if not location:
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location = self.get_full_path()
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if not absolute_http_url_re.match(location):
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current_uri = '%s://%s%s' % (self.is_secure() and 'https' or 'http',
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self.get_host(), self.path)
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location = urljoin(current_uri, location)
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return iri_to_uri(location)
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def is_secure(self):
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return os.environ.get("HTTPS") == "on"
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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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def _set_encoding(self, val):
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"""
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Sets the encoding used for GET/POST accesses. If the GET or POST
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dictionary has already been created, it is removed and recreated 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 _get_encoding(self):
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return self._encoding
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encoding = property(_get_encoding, _set_encoding)
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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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def _set_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 _get_upload_handlers(self):
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if not self._upload_handlers:
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# If thre 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 = property(_get_upload_handlers, _set_upload_handlers)
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def parse_file_upload(self, META, post_data):
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"""Returns 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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class QueryDict(MultiValueDict):
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"""
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A specialized MultiValueDict that takes a query string when initialized.
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This is immutable unless you create a copy of it.
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Values retrieved from this class are converted from the given encoding
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(DEFAULT_CHARSET by default) to unicode.
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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, mutable=False, encoding=None):
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MultiValueDict.__init__(self)
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if not encoding:
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# *Important*: do not import settings any earlier because of note
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# in core.handlers.modpython.
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from django.conf import settings
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encoding = settings.DEFAULT_CHARSET
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self.encoding = encoding
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for key, value in parse_qsl((query_string or ''), True): # keep_blank_values=True
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self.appendlist(force_unicode(key, encoding, errors='replace'),
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force_unicode(value, encoding, errors='replace'))
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self._mutable = mutable
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def _get_encoding(self):
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if self._encoding is None:
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# *Important*: do not import settings at the module level because
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# of the note in core.handlers.modpython.
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from django.conf import settings
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self._encoding = settings.DEFAULT_CHARSET
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return self._encoding
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def _set_encoding(self, value):
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self._encoding = value
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encoding = property(_get_encoding, _set_encoding)
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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 = str_to_unicode(key, self.encoding)
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value = str_to_unicode(value, self.encoding)
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MultiValueDict.__setitem__(self, key, value)
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def __delitem__(self, key):
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self._assert_mutable()
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super(QueryDict, self).__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 dict.items(self):
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dict.__setitem__(result, key, value)
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return result
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def __deepcopy__(self, memo):
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import django.utils.copycompat as copy
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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 dict.items(self):
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dict.__setitem__(result, 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 = str_to_unicode(key, self.encoding)
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list_ = [str_to_unicode(elt, self.encoding) for elt in list_]
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MultiValueDict.setlist(self, key, list_)
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def setlistdefault(self, key, default_list=()):
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self._assert_mutable()
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if key not in self:
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self.setlist(key, default_list)
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return MultiValueDict.getlist(self, key)
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def appendlist(self, key, value):
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self._assert_mutable()
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key = str_to_unicode(key, self.encoding)
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value = str_to_unicode(value, self.encoding)
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MultiValueDict.appendlist(self, key, value)
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def update(self, other_dict):
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self._assert_mutable()
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f = lambda s: str_to_unicode(s, self.encoding)
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if hasattr(other_dict, 'lists'):
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for key, valuelist in other_dict.lists():
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for value in valuelist:
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MultiValueDict.update(self, {f(key): f(value)})
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else:
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d = dict([(f(k), f(v)) for k, v in other_dict.items()])
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MultiValueDict.update(self, d)
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def pop(self, key, *args):
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self._assert_mutable()
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return MultiValueDict.pop(self, key, *args)
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def popitem(self):
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self._assert_mutable()
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return MultiValueDict.popitem(self)
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def clear(self):
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self._assert_mutable()
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MultiValueDict.clear(self)
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def setdefault(self, key, default=None):
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self._assert_mutable()
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key = str_to_unicode(key, self.encoding)
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default = str_to_unicode(default, self.encoding)
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return MultiValueDict.setdefault(self, key, default)
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def copy(self):
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"""Returns a mutable copy of this object."""
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return self.__deepcopy__({})
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def urlencode(self):
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output = []
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for k, list_ in self.lists():
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k = smart_str(k, self.encoding)
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output.extend([urlencode({k: smart_str(v, self.encoding)}) for v in list_])
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return '&'.join(output)
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class CompatCookie(SimpleCookie):
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"""
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Cookie class that handles some issues with browser compatibility.
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"""
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def value_encode(self, val):
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# Some browsers do not support quoted-string from RFC 2109,
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# including some versions of Safari and Internet Explorer.
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# These browsers split on ';', and some versions of Safari
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# are known to split on ', '. Therefore, we encode ';' and ','
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# SimpleCookie already does the hard work of encoding and decoding.
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# It uses octal sequences like '\\012' for newline etc.
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# and non-ASCII chars. We just make use of this mechanism, to
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# avoid introducing two encoding schemes which would be confusing
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# and especially awkward for javascript.
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# NB, contrary to Python docs, value_encode returns a tuple containing
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# (real val, encoded_val)
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val, encoded = super(CompatCookie, self).value_encode(val)
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encoded = encoded.replace(";", "\\073").replace(",","\\054")
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# If encoded now contains any quoted chars, we need double quotes
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# around the whole string.
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if "\\" in encoded and not encoded.startswith('"'):
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encoded = '"' + encoded + '"'
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return val, encoded
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def parse_cookie(cookie):
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if cookie == '':
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return {}
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if not isinstance(cookie, BaseCookie):
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try:
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c = CompatCookie()
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c.load(cookie)
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except CookieError:
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# Invalid cookie
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return {}
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else:
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c = cookie
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cookiedict = {}
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for key in c.keys():
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cookiedict[key] = c.get(key).value
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return cookiedict
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class BadHeaderError(ValueError):
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pass
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class HttpResponse(object):
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"""A basic HTTP response, with content and dictionary-accessed headers."""
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status_code = 200
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def __init__(self, content='', mimetype=None, status=None,
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content_type=None):
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from django.conf import settings
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self._charset = settings.DEFAULT_CHARSET
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if mimetype:
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content_type = mimetype # For backwards compatibility
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if not content_type:
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content_type = "%s; charset=%s" % (settings.DEFAULT_CONTENT_TYPE,
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settings.DEFAULT_CHARSET)
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if not isinstance(content, basestring) and hasattr(content, '__iter__'):
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self._container = content
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self._is_string = False
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else:
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self._container = [content]
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self._is_string = True
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self.cookies = CompatCookie()
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if status:
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self.status_code = status
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# _headers is a mapping of the lower-case name to the original case of
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# the header (required for working with legacy systems) and the header
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# value.
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self._headers = {'content-type': ('Content-Type', content_type)}
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def __str__(self):
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"""Full HTTP message, including headers."""
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return '\n'.join(['%s: %s' % (key, value)
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for key, value in self._headers.values()]) \
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+ '\n\n' + self.content
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def _convert_to_ascii(self, *values):
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"""Converts all values to ascii strings."""
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for value in values:
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if isinstance(value, unicode):
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try:
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value = value.encode('us-ascii')
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except UnicodeError, e:
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e.reason += ', HTTP response headers must be in US-ASCII format'
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raise
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else:
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value = str(value)
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if '\n' in value or '\r' in value:
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raise BadHeaderError("Header values can't contain newlines (got %r)" % (value))
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yield value
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def __setitem__(self, header, value):
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header, value = self._convert_to_ascii(header, value)
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self._headers[header.lower()] = (header, value)
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def __delitem__(self, header):
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try:
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del self._headers[header.lower()]
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except KeyError:
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pass
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def __getitem__(self, header):
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return self._headers[header.lower()][1]
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def has_header(self, header):
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"""Case-insensitive check for a header."""
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return self._headers.has_key(header.lower())
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__contains__ = has_header
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def items(self):
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return self._headers.values()
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def get(self, header, alternate):
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return self._headers.get(header.lower(), (None, alternate))[1]
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def set_cookie(self, key, value='', max_age=None, expires=None, path='/',
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domain=None, secure=False):
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self.cookies[key] = value
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if max_age is not None:
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self.cookies[key]['max-age'] = max_age
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if expires is not None:
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self.cookies[key]['expires'] = expires
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if path is not None:
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self.cookies[key]['path'] = path
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if domain is not None:
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self.cookies[key]['domain'] = domain
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if secure:
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self.cookies[key]['secure'] = True
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def delete_cookie(self, key, path='/', domain=None):
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self.set_cookie(key, max_age=0, path=path, domain=domain,
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expires='Thu, 01-Jan-1970 00:00:00 GMT')
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def _get_content(self):
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if self.has_header('Content-Encoding'):
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return ''.join(self._container)
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return smart_str(''.join(self._container), self._charset)
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def _set_content(self, value):
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self._container = [value]
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self._is_string = True
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content = property(_get_content, _set_content)
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def __iter__(self):
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self._iterator = iter(self._container)
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return self
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def next(self):
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chunk = self._iterator.next()
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if isinstance(chunk, unicode):
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chunk = chunk.encode(self._charset)
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return str(chunk)
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def close(self):
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if hasattr(self._container, 'close'):
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self._container.close()
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# The remaining methods partially implement the file-like object interface.
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# See http://docs.python.org/lib/bltin-file-objects.html
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def write(self, content):
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if not self._is_string:
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raise Exception("This %s instance is not writable" % self.__class__)
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self._container.append(content)
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def flush(self):
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pass
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def tell(self):
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if not self._is_string:
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raise Exception("This %s instance cannot tell its position" % self.__class__)
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return sum([len(chunk) for chunk in self._container])
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class HttpResponseRedirect(HttpResponse):
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status_code = 302
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def __init__(self, redirect_to):
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HttpResponse.__init__(self)
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self['Location'] = iri_to_uri(redirect_to)
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class HttpResponsePermanentRedirect(HttpResponse):
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status_code = 301
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def __init__(self, redirect_to):
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HttpResponse.__init__(self)
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self['Location'] = iri_to_uri(redirect_to)
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class HttpResponseNotModified(HttpResponse):
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status_code = 304
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class HttpResponseBadRequest(HttpResponse):
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status_code = 400
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class HttpResponseNotFound(HttpResponse):
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status_code = 404
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class HttpResponseForbidden(HttpResponse):
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status_code = 403
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class HttpResponseNotAllowed(HttpResponse):
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status_code = 405
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def __init__(self, permitted_methods):
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HttpResponse.__init__(self)
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self['Allow'] = ', '.join(permitted_methods)
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class HttpResponseGone(HttpResponse):
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status_code = 410
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def __init__(self, *args, **kwargs):
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HttpResponse.__init__(self, *args, **kwargs)
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class HttpResponseServerError(HttpResponse):
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status_code = 500
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def __init__(self, *args, **kwargs):
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HttpResponse.__init__(self, *args, **kwargs)
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# A backwards compatible alias for HttpRequest.get_host.
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def get_host(request):
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return request.get_host()
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# It's neither necessary nor appropriate to use
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# django.utils.encoding.smart_unicode for parsing URLs and form inputs. Thus,
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# this slightly more restricted function.
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def str_to_unicode(s, encoding):
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"""
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Converts basestring objects to unicode, using the given encoding. Illegally
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encoded input characters are replaced with Unicode "unknown" codepoint
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(\ufffd).
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Returns any non-basestring objects without change.
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"""
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if isinstance(s, str):
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return unicode(s, encoding, 'replace')
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else:
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return s
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