559 lines
19 KiB
Python
559 lines
19 KiB
Python
import datetime
|
|
import json
|
|
import mimetypes
|
|
import os
|
|
import re
|
|
import sys
|
|
import time
|
|
from email.header import Header
|
|
from http.client import responses
|
|
from urllib.parse import quote, urlparse
|
|
|
|
from django.conf import settings
|
|
from django.core import signals, signing
|
|
from django.core.exceptions import DisallowedRedirect
|
|
from django.core.serializers.json import DjangoJSONEncoder
|
|
from django.http.cookie import SimpleCookie
|
|
from django.utils import timezone
|
|
from django.utils.encoding import iri_to_uri
|
|
from django.utils.http import http_date
|
|
|
|
_charset_from_content_type_re = re.compile(r';\s*charset=(?P<charset>[^\s;]+)', re.I)
|
|
|
|
|
|
class BadHeaderError(ValueError):
|
|
pass
|
|
|
|
|
|
class HttpResponseBase:
|
|
"""
|
|
An HTTP response base class with dictionary-accessed headers.
|
|
|
|
This class doesn't handle content. It should not be used directly.
|
|
Use the HttpResponse and StreamingHttpResponse subclasses instead.
|
|
"""
|
|
|
|
status_code = 200
|
|
|
|
def __init__(self, content_type=None, status=None, reason=None, charset=None):
|
|
# _headers is a mapping of the lowercase name to the original case of
|
|
# the header (required for working with legacy systems) and the header
|
|
# value. Both the name of the header and its value are ASCII strings.
|
|
self._headers = {}
|
|
self._closable_objects = []
|
|
# This parameter is set by the handler. It's necessary to preserve the
|
|
# historical behavior of request_finished.
|
|
self._handler_class = None
|
|
self.cookies = SimpleCookie()
|
|
self.closed = False
|
|
if status is not None:
|
|
try:
|
|
self.status_code = int(status)
|
|
except (ValueError, TypeError):
|
|
raise TypeError('HTTP status code must be an integer.')
|
|
|
|
if not 100 <= self.status_code <= 599:
|
|
raise ValueError('HTTP status code must be an integer from 100 to 599.')
|
|
self._reason_phrase = reason
|
|
self._charset = charset
|
|
if content_type is None:
|
|
content_type = 'text/html; charset=%s' % self.charset
|
|
self['Content-Type'] = content_type
|
|
|
|
@property
|
|
def reason_phrase(self):
|
|
if self._reason_phrase is not None:
|
|
return self._reason_phrase
|
|
# Leave self._reason_phrase unset in order to use the default
|
|
# reason phrase for status code.
|
|
return responses.get(self.status_code, 'Unknown Status Code')
|
|
|
|
@reason_phrase.setter
|
|
def reason_phrase(self, value):
|
|
self._reason_phrase = value
|
|
|
|
@property
|
|
def charset(self):
|
|
if self._charset is not None:
|
|
return self._charset
|
|
content_type = self.get('Content-Type', '')
|
|
matched = _charset_from_content_type_re.search(content_type)
|
|
if matched:
|
|
# Extract the charset and strip its double quotes
|
|
return matched.group('charset').replace('"', '')
|
|
return settings.DEFAULT_CHARSET
|
|
|
|
@charset.setter
|
|
def charset(self, value):
|
|
self._charset = value
|
|
|
|
def serialize_headers(self):
|
|
"""HTTP headers as a bytestring."""
|
|
def to_bytes(val, encoding):
|
|
return val if isinstance(val, bytes) else val.encode(encoding)
|
|
|
|
headers = [
|
|
(to_bytes(key, 'ascii') + b': ' + to_bytes(value, 'latin-1'))
|
|
for key, value in self._headers.values()
|
|
]
|
|
return b'\r\n'.join(headers)
|
|
|
|
__bytes__ = serialize_headers
|
|
|
|
@property
|
|
def _content_type_for_repr(self):
|
|
return ', "%s"' % self['Content-Type'] if 'Content-Type' in self else ''
|
|
|
|
def _convert_to_charset(self, value, charset, mime_encode=False):
|
|
"""
|
|
Convert headers key/value to ascii/latin-1 native strings.
|
|
|
|
`charset` must be 'ascii' or 'latin-1'. If `mime_encode` is True and
|
|
`value` can't be represented in the given charset, apply MIME-encoding.
|
|
"""
|
|
if not isinstance(value, (bytes, str)):
|
|
value = str(value)
|
|
if ((isinstance(value, bytes) and (b'\n' in value or b'\r' in value)) or
|
|
isinstance(value, str) and ('\n' in value or '\r' in value)):
|
|
raise BadHeaderError("Header values can't contain newlines (got %r)" % value)
|
|
try:
|
|
if isinstance(value, str):
|
|
# Ensure string is valid in given charset
|
|
value.encode(charset)
|
|
else:
|
|
# Convert bytestring using given charset
|
|
value = value.decode(charset)
|
|
except UnicodeError as e:
|
|
if mime_encode:
|
|
value = Header(value, 'utf-8', maxlinelen=sys.maxsize).encode()
|
|
else:
|
|
e.reason += ', HTTP response headers must be in %s format' % charset
|
|
raise
|
|
return value
|
|
|
|
def __setitem__(self, header, value):
|
|
header = self._convert_to_charset(header, 'ascii')
|
|
value = self._convert_to_charset(value, 'latin-1', mime_encode=True)
|
|
self._headers[header.lower()] = (header, value)
|
|
|
|
def __delitem__(self, header):
|
|
self._headers.pop(header.lower(), False)
|
|
|
|
def __getitem__(self, header):
|
|
return self._headers[header.lower()][1]
|
|
|
|
def has_header(self, header):
|
|
"""Case-insensitive check for a header."""
|
|
return header.lower() in self._headers
|
|
|
|
__contains__ = has_header
|
|
|
|
def items(self):
|
|
return self._headers.values()
|
|
|
|
def get(self, header, alternate=None):
|
|
return self._headers.get(header.lower(), (None, alternate))[1]
|
|
|
|
def set_cookie(self, key, value='', max_age=None, expires=None, path='/',
|
|
domain=None, secure=False, httponly=False, samesite=None):
|
|
"""
|
|
Set a cookie.
|
|
|
|
``expires`` can be:
|
|
- a string in the correct format,
|
|
- a naive ``datetime.datetime`` object in UTC,
|
|
- an aware ``datetime.datetime`` object in any time zone.
|
|
If it is a ``datetime.datetime`` object then calculate ``max_age``.
|
|
"""
|
|
self.cookies[key] = value
|
|
if expires is not None:
|
|
if isinstance(expires, datetime.datetime):
|
|
if timezone.is_aware(expires):
|
|
expires = timezone.make_naive(expires, timezone.utc)
|
|
delta = expires - expires.utcnow()
|
|
# Add one second so the date matches exactly (a fraction of
|
|
# time gets lost between converting to a timedelta and
|
|
# then the date string).
|
|
delta = delta + datetime.timedelta(seconds=1)
|
|
# Just set max_age - the max_age logic will set expires.
|
|
expires = None
|
|
max_age = max(0, delta.days * 86400 + delta.seconds)
|
|
else:
|
|
self.cookies[key]['expires'] = expires
|
|
else:
|
|
self.cookies[key]['expires'] = ''
|
|
if max_age is not None:
|
|
self.cookies[key]['max-age'] = max_age
|
|
# IE requires expires, so set it if hasn't been already.
|
|
if not expires:
|
|
self.cookies[key]['expires'] = http_date(time.time() + max_age)
|
|
if path is not None:
|
|
self.cookies[key]['path'] = path
|
|
if domain is not None:
|
|
self.cookies[key]['domain'] = domain
|
|
if secure:
|
|
self.cookies[key]['secure'] = True
|
|
if httponly:
|
|
self.cookies[key]['httponly'] = True
|
|
if samesite:
|
|
if samesite.lower() not in ('lax', 'strict'):
|
|
raise ValueError('samesite must be "lax" or "strict".')
|
|
self.cookies[key]['samesite'] = samesite
|
|
|
|
def setdefault(self, key, value):
|
|
"""Set a header unless it has already been set."""
|
|
if key not in self:
|
|
self[key] = value
|
|
|
|
def set_signed_cookie(self, key, value, salt='', **kwargs):
|
|
value = signing.get_cookie_signer(salt=key + salt).sign(value)
|
|
return self.set_cookie(key, value, **kwargs)
|
|
|
|
def delete_cookie(self, key, path='/', domain=None):
|
|
# Most browsers ignore the Set-Cookie header if the cookie name starts
|
|
# with __Host- or __Secure- and the cookie doesn't use the secure flag.
|
|
secure = key.startswith(('__Secure-', '__Host-'))
|
|
self.set_cookie(
|
|
key, max_age=0, path=path, domain=domain, secure=secure,
|
|
expires='Thu, 01 Jan 1970 00:00:00 GMT',
|
|
)
|
|
|
|
# Common methods used by subclasses
|
|
|
|
def make_bytes(self, value):
|
|
"""Turn a value into a bytestring encoded in the output charset."""
|
|
# Per PEP 3333, this response body must be bytes. To avoid returning
|
|
# an instance of a subclass, this function returns `bytes(value)`.
|
|
# This doesn't make a copy when `value` already contains bytes.
|
|
|
|
# Handle string types -- we can't rely on force_bytes here because:
|
|
# - Python attempts str conversion first
|
|
# - when self._charset != 'utf-8' it re-encodes the content
|
|
if isinstance(value, bytes):
|
|
return bytes(value)
|
|
if isinstance(value, str):
|
|
return bytes(value.encode(self.charset))
|
|
# Handle non-string types.
|
|
return str(value).encode(self.charset)
|
|
|
|
# These methods partially implement the file-like object interface.
|
|
# See https://docs.python.org/library/io.html#io.IOBase
|
|
|
|
# The WSGI server must call this method upon completion of the request.
|
|
# See http://blog.dscpl.com.au/2012/10/obligations-for-calling-close-on.html
|
|
def close(self):
|
|
for closable in self._closable_objects:
|
|
try:
|
|
closable.close()
|
|
except Exception:
|
|
pass
|
|
self.closed = True
|
|
signals.request_finished.send(sender=self._handler_class)
|
|
|
|
def write(self, content):
|
|
raise OSError('This %s instance is not writable' % self.__class__.__name__)
|
|
|
|
def flush(self):
|
|
pass
|
|
|
|
def tell(self):
|
|
raise OSError('This %s instance cannot tell its position' % self.__class__.__name__)
|
|
|
|
# These methods partially implement a stream-like object interface.
|
|
# See https://docs.python.org/library/io.html#io.IOBase
|
|
|
|
def readable(self):
|
|
return False
|
|
|
|
def seekable(self):
|
|
return False
|
|
|
|
def writable(self):
|
|
return False
|
|
|
|
def writelines(self, lines):
|
|
raise OSError('This %s instance is not writable' % self.__class__.__name__)
|
|
|
|
|
|
class HttpResponse(HttpResponseBase):
|
|
"""
|
|
An HTTP response class with a string as content.
|
|
|
|
This content that can be read, appended to, or replaced.
|
|
"""
|
|
|
|
streaming = False
|
|
|
|
def __init__(self, content=b'', *args, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
# Content is a bytestring. See the `content` property methods.
|
|
self.content = content
|
|
|
|
def __repr__(self):
|
|
return '<%(cls)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,
|
|
}
|
|
|
|
def serialize(self):
|
|
"""Full HTTP message, including headers, as a bytestring."""
|
|
return self.serialize_headers() + b'\r\n\r\n' + self.content
|
|
|
|
__bytes__ = serialize
|
|
|
|
@property
|
|
def content(self):
|
|
return b''.join(self._container)
|
|
|
|
@content.setter
|
|
def content(self, value):
|
|
# Consume iterators upon assignment to allow repeated iteration.
|
|
if hasattr(value, '__iter__') and not isinstance(value, (bytes, str)):
|
|
content = b''.join(self.make_bytes(chunk) for chunk in value)
|
|
if hasattr(value, 'close'):
|
|
try:
|
|
value.close()
|
|
except Exception:
|
|
pass
|
|
else:
|
|
content = self.make_bytes(value)
|
|
# Create a list of properly encoded bytestrings to support write().
|
|
self._container = [content]
|
|
|
|
def __iter__(self):
|
|
return iter(self._container)
|
|
|
|
def write(self, content):
|
|
self._container.append(self.make_bytes(content))
|
|
|
|
def tell(self):
|
|
return len(self.content)
|
|
|
|
def getvalue(self):
|
|
return self.content
|
|
|
|
def writable(self):
|
|
return True
|
|
|
|
def writelines(self, lines):
|
|
for line in lines:
|
|
self.write(line)
|
|
|
|
|
|
class StreamingHttpResponse(HttpResponseBase):
|
|
"""
|
|
A streaming HTTP response class with an iterator as content.
|
|
|
|
This should only be iterated once, when the response is streamed to the
|
|
client. However, it can be appended to or replaced with a new iterator
|
|
that wraps the original content (or yields entirely new content).
|
|
"""
|
|
|
|
streaming = True
|
|
|
|
def __init__(self, streaming_content=(), *args, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
# `streaming_content` should be an iterable of bytestrings.
|
|
# See the `streaming_content` property methods.
|
|
self.streaming_content = streaming_content
|
|
|
|
@property
|
|
def content(self):
|
|
raise AttributeError(
|
|
"This %s instance has no `content` attribute. Use "
|
|
"`streaming_content` instead." % self.__class__.__name__
|
|
)
|
|
|
|
@property
|
|
def streaming_content(self):
|
|
return map(self.make_bytes, self._iterator)
|
|
|
|
@streaming_content.setter
|
|
def streaming_content(self, value):
|
|
self._set_streaming_content(value)
|
|
|
|
def _set_streaming_content(self, value):
|
|
# Ensure we can never iterate on "value" more than once.
|
|
self._iterator = iter(value)
|
|
if hasattr(value, 'close'):
|
|
self._closable_objects.append(value)
|
|
|
|
def __iter__(self):
|
|
return self.streaming_content
|
|
|
|
def getvalue(self):
|
|
return b''.join(self.streaming_content)
|
|
|
|
|
|
class FileResponse(StreamingHttpResponse):
|
|
"""
|
|
A streaming HTTP response class optimized for files.
|
|
"""
|
|
block_size = 4096
|
|
|
|
def __init__(self, *args, as_attachment=False, filename='', **kwargs):
|
|
self.as_attachment = as_attachment
|
|
self.filename = filename
|
|
super().__init__(*args, **kwargs)
|
|
|
|
def _set_streaming_content(self, value):
|
|
if not hasattr(value, 'read'):
|
|
self.file_to_stream = None
|
|
return super()._set_streaming_content(value)
|
|
|
|
self.file_to_stream = filelike = value
|
|
if hasattr(filelike, 'close'):
|
|
self._closable_objects.append(filelike)
|
|
value = iter(lambda: filelike.read(self.block_size), b'')
|
|
self.set_headers(filelike)
|
|
super()._set_streaming_content(value)
|
|
|
|
def set_headers(self, filelike):
|
|
"""
|
|
Set some common response headers (Content-Length, Content-Type, and
|
|
Content-Disposition) based on the `filelike` response content.
|
|
"""
|
|
encoding_map = {
|
|
'bzip2': 'application/x-bzip',
|
|
'gzip': 'application/gzip',
|
|
'xz': 'application/x-xz',
|
|
}
|
|
filename = getattr(filelike, 'name', None)
|
|
filename = filename if (isinstance(filename, str) and filename) else self.filename
|
|
if os.path.isabs(filename):
|
|
self['Content-Length'] = os.path.getsize(filelike.name)
|
|
elif hasattr(filelike, 'getbuffer'):
|
|
self['Content-Length'] = filelike.getbuffer().nbytes
|
|
|
|
if self.get('Content-Type', '').startswith('text/html'):
|
|
if filename:
|
|
content_type, encoding = mimetypes.guess_type(filename)
|
|
# Encoding isn't set to prevent browsers from automatically
|
|
# uncompressing files.
|
|
content_type = encoding_map.get(encoding, content_type)
|
|
self['Content-Type'] = content_type or 'application/octet-stream'
|
|
else:
|
|
self['Content-Type'] = 'application/octet-stream'
|
|
|
|
if self.as_attachment:
|
|
filename = self.filename or os.path.basename(filename)
|
|
if filename:
|
|
try:
|
|
filename.encode('ascii')
|
|
file_expr = 'filename="{}"'.format(filename)
|
|
except UnicodeEncodeError:
|
|
file_expr = "filename*=utf-8''{}".format(quote(filename))
|
|
self['Content-Disposition'] = 'attachment; {}'.format(file_expr)
|
|
|
|
|
|
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)
|