691 lines
23 KiB
Python
691 lines
23 KiB
Python
import datetime
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import io
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import json
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import mimetypes
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import os
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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 quote, 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.datastructures import CaseInsensitiveMapping
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from django.utils.encoding import iri_to_uri
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from django.utils.http import http_date
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from django.utils.regex_helper import _lazy_re_compile
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_charset_from_content_type_re = _lazy_re_compile(
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r";\s*charset=(?P<charset>[^\s;]+)", re.I
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)
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class ResponseHeaders(CaseInsensitiveMapping):
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def __init__(self, data):
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"""
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Populate the initial data using __setitem__ to ensure values are
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correctly encoded.
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"""
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self._store = {}
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if data:
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for header, value in self._unpack_items(data):
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self[header] = value
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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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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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elif isinstance(value, bytes):
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# Convert bytestring using given charset
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value = value.decode(charset)
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else:
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value = str(value)
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# Ensure string is valid in given charset.
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value.encode(charset)
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if "\n" in value or "\r" in value:
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raise BadHeaderError(
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f"Header values can't contain newlines (got {value!r})"
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)
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except UnicodeError as e:
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# Encoding to a string of the specified charset failed, but we
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# don't know what type that value was, or if it contains newlines,
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# which we may need to check for before sending it to be
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# encoded for multiple character sets.
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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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):
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raise BadHeaderError(
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f"Header values can't contain newlines (got {value!r})"
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) from 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 __delitem__(self, key):
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self.pop(key)
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def __setitem__(self, key, value):
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key = self._convert_to_charset(key, "ascii")
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value = self._convert_to_charset(value, "latin-1", mime_encode=True)
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self._store[key.lower()] = (key, value)
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def pop(self, key, default=None):
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return self._store.pop(key.lower(), default)
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def setdefault(self, key, value):
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if key not in self:
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self[key] = value
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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__(
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self, content_type=None, status=None, reason=None, charset=None, headers=None
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):
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self.headers = ResponseHeaders(headers)
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self._charset = charset
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if "Content-Type" not in self.headers:
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if content_type is None:
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content_type = f"text/html; charset={self.charset}"
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self.headers["Content-Type"] = content_type
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elif content_type:
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raise ValueError(
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"'headers' must not contain 'Content-Type' when the "
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"'content_type' parameter is provided."
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)
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self._resource_closers = []
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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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@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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# The Content-Type header may not yet be set, because the charset is
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# being inserted *into* it.
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if content_type := self.headers.get("Content-Type"):
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if matched := _charset_from_content_type_re.search(content_type):
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# Extract the charset and strip its double quotes.
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# Note that having parsed it from the Content-Type, we don't
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# store it back into the _charset for later intentionally, to
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# allow for the Content-Type to be switched again later.
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return matched["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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return b"\r\n".join(
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[
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key.encode("ascii") + b": " + value.encode("latin-1")
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for key, value in self.headers.items()
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]
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)
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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 (
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', "%s"' % self.headers["Content-Type"]
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if "Content-Type" in self.headers
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else ""
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)
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def __setitem__(self, header, value):
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self.headers[header] = value
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def __delitem__(self, header):
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del self.headers[header]
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def __getitem__(self, header):
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return self.headers[header]
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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 in self.headers
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__contains__ = has_header
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def items(self):
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return self.headers.items()
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def get(self, header, alternate=None):
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return self.headers.get(header, alternate)
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def set_cookie(
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self,
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key,
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value="",
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max_age=None,
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expires=None,
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path="/",
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domain=None,
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secure=False,
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httponly=False,
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samesite=None,
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):
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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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``max_age`` can be:
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- int/float specifying seconds,
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- ``datetime.timedelta`` object.
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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_naive(expires):
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expires = timezone.make_aware(expires, datetime.timezone.utc)
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delta = expires - datetime.datetime.now(tz=datetime.timezone.utc)
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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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if max_age is not None:
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raise ValueError("'expires' and 'max_age' can't be used together.")
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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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if isinstance(max_age, datetime.timedelta):
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max_age = max_age.total_seconds()
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self.cookies[key]["max-age"] = int(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"] = http_date(time.time() + 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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if samesite:
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if samesite.lower() not in ("lax", "none", "strict"):
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raise ValueError('samesite must be "lax", "none", or "strict".')
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self.cookies[key]["samesite"] = samesite
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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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self.headers.setdefault(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, samesite=None):
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# Browsers can ignore the Set-Cookie header if the cookie doesn't use
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# the secure flag and:
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# - the cookie name starts with "__Host-" or "__Secure-", or
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# - the samesite is "none".
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secure = key.startswith(("__Secure-", "__Host-")) or (
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samesite and samesite.lower() == "none"
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)
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self.set_cookie(
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key,
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max_age=0,
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path=path,
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domain=domain,
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secure=secure,
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expires="Thu, 01 Jan 1970 00:00:00 GMT",
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samesite=samesite,
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)
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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, memoryview)):
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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.
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return str(value).encode(self.charset)
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# These methods partially implement the file-like object interface.
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# See https://docs.python.org/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 closer in self._resource_closers:
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try:
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closer()
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except Exception:
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pass
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# Free resources that were still referenced.
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self._resource_closers.clear()
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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 OSError("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 OSError(
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"This %s instance cannot tell its position" % self.__class__.__name__
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)
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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 OSError("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 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(
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value, (bytes, memoryview, str)
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):
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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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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__.__qualname__,
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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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@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._resource_closers.append(value.close)
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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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|
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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 __init__(self, *args, as_attachment=False, filename="", **kwargs):
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self.as_attachment = as_attachment
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self.filename = filename
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self._no_explicit_content_type = (
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"content_type" not in kwargs or kwargs["content_type"] is None
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)
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super().__init__(*args, **kwargs)
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def _set_streaming_content(self, value):
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if not hasattr(value, "read"):
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self.file_to_stream = None
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return super()._set_streaming_content(value)
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self.file_to_stream = filelike = value
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if hasattr(filelike, "close"):
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self._resource_closers.append(filelike.close)
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value = iter(lambda: filelike.read(self.block_size), b"")
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self.set_headers(filelike)
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super()._set_streaming_content(value)
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def set_headers(self, filelike):
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"""
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|
Set some common response headers (Content-Length, Content-Type, and
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Content-Disposition) based on the `filelike` response content.
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"""
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filename = getattr(filelike, "name", "")
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filename = filename if isinstance(filename, str) else ""
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seekable = hasattr(filelike, "seek") and (
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not hasattr(filelike, "seekable") or filelike.seekable()
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)
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if hasattr(filelike, "tell"):
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if seekable:
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initial_position = filelike.tell()
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filelike.seek(0, io.SEEK_END)
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self.headers["Content-Length"] = filelike.tell() - initial_position
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filelike.seek(initial_position)
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elif hasattr(filelike, "getbuffer"):
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self.headers["Content-Length"] = (
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filelike.getbuffer().nbytes - filelike.tell()
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)
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elif os.path.exists(filename):
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self.headers["Content-Length"] = (
|
|
os.path.getsize(filename) - filelike.tell()
|
|
)
|
|
elif seekable:
|
|
self.headers["Content-Length"] = sum(
|
|
iter(lambda: len(filelike.read(self.block_size)), 0)
|
|
)
|
|
filelike.seek(-int(self.headers["Content-Length"]), io.SEEK_END)
|
|
|
|
filename = os.path.basename(self.filename or filename)
|
|
if self._no_explicit_content_type:
|
|
if filename:
|
|
content_type, encoding = mimetypes.guess_type(filename)
|
|
# Encoding isn't set to prevent browsers from automatically
|
|
# uncompressing files.
|
|
content_type = {
|
|
"bzip2": "application/x-bzip",
|
|
"gzip": "application/gzip",
|
|
"xz": "application/x-xz",
|
|
}.get(encoding, content_type)
|
|
self.headers["Content-Type"] = (
|
|
content_type or "application/octet-stream"
|
|
)
|
|
else:
|
|
self.headers["Content-Type"] = "application/octet-stream"
|
|
|
|
if filename:
|
|
disposition = "attachment" if self.as_attachment else "inline"
|
|
try:
|
|
filename.encode("ascii")
|
|
file_expr = 'filename="{}"'.format(filename)
|
|
except UnicodeEncodeError:
|
|
file_expr = "filename*=utf-8''{}".format(quote(filename))
|
|
self.headers["Content-Disposition"] = "{}; {}".format(
|
|
disposition, file_expr
|
|
)
|
|
elif self.as_attachment:
|
|
self.headers["Content-Disposition"] = "attachment"
|
|
|
|
|
|
class HttpResponseRedirectBase(HttpResponse):
|
|
allowed_schemes = ["http", "https", "ftp"]
|
|
|
|
def __init__(self, redirect_to, *args, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
self["Location"] = iri_to_uri(redirect_to)
|
|
parsed = urlparse(str(redirect_to))
|
|
if parsed.scheme and parsed.scheme not in self.allowed_schemes:
|
|
raise DisallowedRedirect(
|
|
"Unsafe redirect to URL with protocol '%s'" % parsed.scheme
|
|
)
|
|
|
|
url = property(lambda self: self["Location"])
|
|
|
|
def __repr__(self):
|
|
return (
|
|
'<%(cls)s status_code=%(status_code)d%(content_type)s, url="%(url)s">'
|
|
% {
|
|
"cls": self.__class__.__name__,
|
|
"status_code": self.status_code,
|
|
"content_type": self._content_type_for_repr,
|
|
"url": self.url,
|
|
}
|
|
)
|
|
|
|
|
|
class HttpResponseRedirect(HttpResponseRedirectBase):
|
|
status_code = 302
|
|
|
|
|
|
class HttpResponsePermanentRedirect(HttpResponseRedirectBase):
|
|
status_code = 301
|
|
|
|
|
|
class HttpResponseNotModified(HttpResponse):
|
|
status_code = 304
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
del self["content-type"]
|
|
|
|
@HttpResponse.content.setter
|
|
def content(self, value):
|
|
if value:
|
|
raise AttributeError(
|
|
"You cannot set content to a 304 (Not Modified) response"
|
|
)
|
|
self._container = []
|
|
|
|
|
|
class HttpResponseBadRequest(HttpResponse):
|
|
status_code = 400
|
|
|
|
|
|
class HttpResponseNotFound(HttpResponse):
|
|
status_code = 404
|
|
|
|
|
|
class HttpResponseForbidden(HttpResponse):
|
|
status_code = 403
|
|
|
|
|
|
class HttpResponseNotAllowed(HttpResponse):
|
|
status_code = 405
|
|
|
|
def __init__(self, permitted_methods, *args, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
self["Allow"] = ", ".join(permitted_methods)
|
|
|
|
def __repr__(self):
|
|
return "<%(cls)s [%(methods)s] status_code=%(status_code)d%(content_type)s>" % {
|
|
"cls": self.__class__.__name__,
|
|
"status_code": self.status_code,
|
|
"content_type": self._content_type_for_repr,
|
|
"methods": self["Allow"],
|
|
}
|
|
|
|
|
|
class HttpResponseGone(HttpResponse):
|
|
status_code = 410
|
|
|
|
|
|
class HttpResponseServerError(HttpResponse):
|
|
status_code = 500
|
|
|
|
|
|
class Http404(Exception):
|
|
pass
|
|
|
|
|
|
class JsonResponse(HttpResponse):
|
|
"""
|
|
An HTTP response class that consumes data to be serialized to JSON.
|
|
|
|
:param data: Data to be dumped into json. By default only ``dict`` objects
|
|
are allowed to be passed due to a security flaw before ECMAScript 5. See
|
|
the ``safe`` parameter for more information.
|
|
:param encoder: Should be a json encoder class. Defaults to
|
|
``django.core.serializers.json.DjangoJSONEncoder``.
|
|
:param safe: Controls if only ``dict`` objects may be serialized. Defaults
|
|
to ``True``.
|
|
:param json_dumps_params: A dictionary of kwargs passed to json.dumps().
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
data,
|
|
encoder=DjangoJSONEncoder,
|
|
safe=True,
|
|
json_dumps_params=None,
|
|
**kwargs,
|
|
):
|
|
if safe and not isinstance(data, dict):
|
|
raise TypeError(
|
|
"In order to allow non-dict objects to be serialized set the "
|
|
"safe parameter to False."
|
|
)
|
|
if json_dumps_params is None:
|
|
json_dumps_params = {}
|
|
kwargs.setdefault("content_type", "application/json")
|
|
data = json.dumps(data, cls=encoder, **json_dumps_params)
|
|
super().__init__(content=data, **kwargs)
|