511 lines
17 KiB
Python
511 lines
17 KiB
Python
import datetime
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import json
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import re
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import sys
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import time
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from email.header import Header
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from http.client import responses
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from urllib.parse import urlparse
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from django.conf import settings
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from django.core import signals, signing
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from django.core.exceptions import DisallowedRedirect
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from django.core.serializers.json import DjangoJSONEncoder
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from django.http.cookie import SimpleCookie
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from django.utils import timezone
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from django.utils.encoding import force_bytes, force_text, iri_to_uri
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from django.utils.http import cookie_date
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_charset_from_content_type_re = re.compile(r';\s*charset=(?P<charset>[^\s;]+)', re.I)
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class BadHeaderError(ValueError):
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pass
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class HttpResponseBase:
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"""
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An HTTP response base class with dictionary-accessed headers.
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This class doesn't handle content. It should not be used directly.
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Use the HttpResponse and StreamingHttpResponse subclasses instead.
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"""
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status_code = 200
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def __init__(self, content_type=None, status=None, reason=None, charset=None):
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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. Both the name of the header and its value are ASCII strings.
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self._headers = {}
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self._closable_objects = []
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# This parameter is set by the handler. It's necessary to preserve the
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# historical behavior of request_finished.
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self._handler_class = None
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self.cookies = SimpleCookie()
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self.closed = False
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if status is not None:
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try:
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self.status_code = int(status)
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except (ValueError, TypeError):
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raise TypeError('HTTP status code must be an integer.')
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if not 100 <= self.status_code <= 599:
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raise ValueError('HTTP status code must be an integer from 100 to 599.')
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self._reason_phrase = reason
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self._charset = charset
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if content_type is None:
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content_type = '%s; charset=%s' % (settings.DEFAULT_CONTENT_TYPE,
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self.charset)
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self['Content-Type'] = content_type
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@property
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def reason_phrase(self):
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if self._reason_phrase is not None:
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return self._reason_phrase
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# Leave self._reason_phrase unset in order to use the default
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# reason phrase for status code.
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return responses.get(self.status_code, 'Unknown Status Code')
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@reason_phrase.setter
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def reason_phrase(self, value):
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self._reason_phrase = value
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@property
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def charset(self):
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if self._charset is not None:
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return self._charset
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content_type = self.get('Content-Type', '')
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matched = _charset_from_content_type_re.search(content_type)
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if matched:
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# Extract the charset and strip its double quotes
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return matched.group('charset').replace('"', '')
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return settings.DEFAULT_CHARSET
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@charset.setter
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def charset(self, value):
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self._charset = value
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def serialize_headers(self):
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"""HTTP headers as a bytestring."""
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def to_bytes(val, encoding):
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return val if isinstance(val, bytes) else val.encode(encoding)
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headers = [
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(b': '.join([to_bytes(key, 'ascii'), to_bytes(value, 'latin-1')]))
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for key, value in self._headers.values()
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]
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return b'\r\n'.join(headers)
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__bytes__ = serialize_headers
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@property
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def _content_type_for_repr(self):
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return ', "%s"' % self['Content-Type'] if 'Content-Type' in self else ''
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def _convert_to_charset(self, value, charset, mime_encode=False):
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"""
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Convert headers key/value to ascii/latin-1 native strings.
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`charset` must be 'ascii' or 'latin-1'. If `mime_encode` is True and
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`value` can't be represented in the given charset, apply MIME-encoding.
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"""
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if not isinstance(value, (bytes, str)):
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value = str(value)
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if ((isinstance(value, bytes) and (b'\n' in value or b'\r' in value)) or
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isinstance(value, str) and ('\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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try:
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if isinstance(value, str):
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# Ensure string is valid in given charset
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value.encode(charset)
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else:
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# Convert bytestring using given charset
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value = value.decode(charset)
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except UnicodeError as e:
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if mime_encode:
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value = Header(value, 'utf-8', maxlinelen=sys.maxsize).encode()
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else:
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e.reason += ', HTTP response headers must be in %s format' % charset
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raise
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return value
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def __setitem__(self, header, value):
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header = self._convert_to_charset(header, 'ascii')
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value = self._convert_to_charset(value, 'latin-1', mime_encode=True)
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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 header.lower() in self._headers
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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=None):
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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, httponly=False):
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"""
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Set a cookie.
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``expires`` can be:
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- a string in the correct format,
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- a naive ``datetime.datetime`` object in UTC,
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- an aware ``datetime.datetime`` object in any time zone.
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If it is a ``datetime.datetime`` object then calculate ``max_age``.
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"""
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self.cookies[key] = value
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if expires is not None:
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if isinstance(expires, datetime.datetime):
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if timezone.is_aware(expires):
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expires = timezone.make_naive(expires, timezone.utc)
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delta = expires - expires.utcnow()
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# Add one second so the date matches exactly (a fraction of
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# time gets lost between converting to a timedelta and
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# then the date string).
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delta = delta + datetime.timedelta(seconds=1)
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# Just set max_age - the max_age logic will set expires.
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expires = None
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max_age = max(0, delta.days * 86400 + delta.seconds)
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else:
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self.cookies[key]['expires'] = expires
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else:
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self.cookies[key]['expires'] = ''
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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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# IE requires expires, so set it if hasn't been already.
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if not expires:
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self.cookies[key]['expires'] = cookie_date(time.time() +
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max_age)
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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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if httponly:
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self.cookies[key]['httponly'] = True
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def setdefault(self, key, value):
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"""Set a header unless it has already been set."""
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if key not in self:
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self[key] = value
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def set_signed_cookie(self, key, value, salt='', **kwargs):
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value = signing.get_cookie_signer(salt=key + salt).sign(value)
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return self.set_cookie(key, value, **kwargs)
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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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# Common methods used by subclasses
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def make_bytes(self, value):
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"""Turn a value into a bytestring encoded in the output charset."""
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# Per PEP 3333, this response body must be bytes. To avoid returning
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# an instance of a subclass, this function returns `bytes(value)`.
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# This doesn't make a copy when `value` already contains bytes.
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# Handle string types -- we can't rely on force_bytes here because:
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# - Python attempts str conversion first
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# - when self._charset != 'utf-8' it re-encodes the content
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if isinstance(value, bytes):
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return bytes(value)
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if isinstance(value, str):
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return bytes(value.encode(self.charset))
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# Handle non-string types (#16494)
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return force_bytes(value, self.charset)
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# These methods partially implement the file-like object interface.
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# See https://docs.python.org/3/library/io.html#io.IOBase
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# The WSGI server must call this method upon completion of the request.
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# See http://blog.dscpl.com.au/2012/10/obligations-for-calling-close-on.html
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def close(self):
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for closable in self._closable_objects:
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try:
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closable.close()
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except Exception:
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pass
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self.closed = True
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signals.request_finished.send(sender=self._handler_class)
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def write(self, content):
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raise IOError("This %s instance is not writable" % self.__class__.__name__)
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def flush(self):
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pass
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def tell(self):
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raise IOError("This %s instance cannot tell its position" % self.__class__.__name__)
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# These methods partially implement a stream-like object interface.
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# See https://docs.python.org/library/io.html#io.IOBase
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def readable(self):
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return False
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def seekable(self):
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return False
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def writable(self):
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return False
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def writelines(self, lines):
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raise IOError("This %s instance is not writable" % self.__class__.__name__)
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class HttpResponse(HttpResponseBase):
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"""
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An HTTP response class with a string as content.
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This content that can be read, appended to, or replaced.
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"""
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streaming = False
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def __init__(self, content=b'', *args, **kwargs):
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super().__init__(*args, **kwargs)
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# Content is a bytestring. See the `content` property methods.
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self.content = content
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def __repr__(self):
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return '<%(cls)s status_code=%(status_code)d%(content_type)s>' % {
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'cls': self.__class__.__name__,
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'status_code': self.status_code,
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'content_type': self._content_type_for_repr,
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}
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def serialize(self):
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"""Full HTTP message, including headers, as a bytestring."""
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return self.serialize_headers() + b'\r\n\r\n' + self.content
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__bytes__ = serialize
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@property
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def content(self):
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return b''.join(self._container)
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@content.setter
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def content(self, value):
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# Consume iterators upon assignment to allow repeated iteration.
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if hasattr(value, '__iter__') and not isinstance(value, (bytes, str)):
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content = b''.join(self.make_bytes(chunk) for chunk in value)
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if hasattr(value, 'close'):
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try:
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value.close()
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except Exception:
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pass
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else:
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content = self.make_bytes(value)
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# Create a list of properly encoded bytestrings to support write().
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self._container = [content]
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def __iter__(self):
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return iter(self._container)
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def write(self, content):
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self._container.append(self.make_bytes(content))
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def tell(self):
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return len(self.content)
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def getvalue(self):
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return self.content
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def writable(self):
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return True
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def writelines(self, lines):
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for line in lines:
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self.write(line)
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class StreamingHttpResponse(HttpResponseBase):
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"""
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A streaming HTTP response class with an iterator as content.
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This should only be iterated once, when the response is streamed to the
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client. However, it can be appended to or replaced with a new iterator
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that wraps the original content (or yields entirely new content).
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"""
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streaming = True
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def __init__(self, streaming_content=(), *args, **kwargs):
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super().__init__(*args, **kwargs)
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# `streaming_content` should be an iterable of bytestrings.
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# See the `streaming_content` property methods.
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self.streaming_content = streaming_content
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@property
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def content(self):
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raise AttributeError(
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"This %s instance has no `content` attribute. Use "
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"`streaming_content` instead." % self.__class__.__name__
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)
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@property
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def streaming_content(self):
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return map(self.make_bytes, self._iterator)
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@streaming_content.setter
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def streaming_content(self, value):
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self._set_streaming_content(value)
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def _set_streaming_content(self, value):
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# Ensure we can never iterate on "value" more than once.
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self._iterator = iter(value)
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if hasattr(value, 'close'):
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self._closable_objects.append(value)
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def __iter__(self):
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return self.streaming_content
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def getvalue(self):
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return b''.join(self.streaming_content)
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class FileResponse(StreamingHttpResponse):
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"""
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A streaming HTTP response class optimized for files.
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"""
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block_size = 4096
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def _set_streaming_content(self, value):
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if hasattr(value, 'read'):
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self.file_to_stream = value
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filelike = value
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if hasattr(filelike, 'close'):
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self._closable_objects.append(filelike)
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value = iter(lambda: filelike.read(self.block_size), b'')
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else:
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self.file_to_stream = None
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super()._set_streaming_content(value)
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class HttpResponseRedirectBase(HttpResponse):
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allowed_schemes = ['http', 'https', 'ftp']
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def __init__(self, redirect_to, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self['Location'] = iri_to_uri(redirect_to)
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parsed = urlparse(force_text(redirect_to))
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if parsed.scheme and parsed.scheme not in self.allowed_schemes:
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raise DisallowedRedirect("Unsafe redirect to URL with protocol '%s'" % parsed.scheme)
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url = property(lambda self: self['Location'])
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def __repr__(self):
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return '<%(cls)s status_code=%(status_code)d%(content_type)s, url="%(url)s">' % {
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'cls': self.__class__.__name__,
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'status_code': self.status_code,
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'content_type': self._content_type_for_repr,
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'url': self.url,
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}
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class HttpResponseRedirect(HttpResponseRedirectBase):
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status_code = 302
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class HttpResponsePermanentRedirect(HttpResponseRedirectBase):
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status_code = 301
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class HttpResponseNotModified(HttpResponse):
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status_code = 304
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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del self['content-type']
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@HttpResponse.content.setter
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def content(self, value):
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if value:
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raise AttributeError("You cannot set content to a 304 (Not Modified) response")
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self._container = []
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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, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self['Allow'] = ', '.join(permitted_methods)
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def __repr__(self):
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return '<%(cls)s [%(methods)s] status_code=%(status_code)d%(content_type)s>' % {
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'cls': self.__class__.__name__,
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'status_code': self.status_code,
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'content_type': self._content_type_for_repr,
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'methods': self['Allow'],
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}
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class HttpResponseGone(HttpResponse):
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status_code = 410
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class HttpResponseServerError(HttpResponse):
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status_code = 500
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class Http404(Exception):
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pass
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class JsonResponse(HttpResponse):
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"""
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An HTTP response class that consumes data to be serialized to JSON.
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:param data: Data to be dumped into json. By default only ``dict`` objects
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are allowed to be passed due to a security flaw before EcmaScript 5. See
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the ``safe`` parameter for more information.
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:param encoder: Should be an json encoder class. Defaults to
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``django.core.serializers.json.DjangoJSONEncoder``.
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:param safe: Controls if only ``dict`` objects may be serialized. Defaults
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to ``True``.
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:param json_dumps_params: A dictionary of kwargs passed to json.dumps().
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"""
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def __init__(self, data, encoder=DjangoJSONEncoder, safe=True,
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json_dumps_params=None, **kwargs):
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if safe and not isinstance(data, dict):
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raise TypeError(
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'In order to allow non-dict objects to be serialized set the '
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'safe parameter to False.'
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)
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if json_dumps_params is None:
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json_dumps_params = {}
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kwargs.setdefault('content_type', 'application/json')
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data = json.dumps(data, cls=encoder, **json_dumps_params)
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super().__init__(content=data, **kwargs)
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