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Mini Shell
Mini Shell
import asyncio
import collections.abc
import datetime
import enum
import json
import math
import time
import warnings
import zlib
from concurrent.futures import Executor
from http.cookies import Morsel, SimpleCookie
from typing import (
TYPE_CHECKING,
Any,
Dict,
Iterator,
Mapping,
MutableMapping,
Optional,
Tuple,
Union,
cast,
)
from multidict import CIMultiDict, istr
from . import hdrs, payload
from .abc import AbstractStreamWriter
from .helpers import (
ETAG_ANY,
PY_38,
QUOTED_ETAG_RE,
ETag,
HeadersMixin,
parse_http_date,
rfc822_formatted_time,
sentinel,
validate_etag_value,
)
from .http import RESPONSES, SERVER_SOFTWARE, HttpVersion10, HttpVersion11
from .payload import Payload
from .typedefs import JSONEncoder, LooseHeaders
__all__ = ("ContentCoding", "StreamResponse", "Response", "json_response")
if TYPE_CHECKING: # pragma: no cover
from .web_request import BaseRequest
BaseClass = MutableMapping[str, Any]
else:
BaseClass = collections.abc.MutableMapping
if not PY_38:
# allow samesite to be used in python < 3.8
# already permitted in python 3.8, see https://bugs.python.org/issue29613
Morsel._reserved["samesite"] = "SameSite" # type: ignore[attr-defined]
class ContentCoding(enum.Enum):
# The content codings that we have support for.
#
# Additional registered codings are listed at:
# https://www.iana.org/assignments/http-parameters/http-parameters.xhtml#content-coding
deflate = "deflate"
gzip = "gzip"
identity = "identity"
############################################################
# HTTP Response classes
############################################################
class StreamResponse(BaseClass, HeadersMixin):
_length_check = True
def __init__(
self,
*,
status: int = 200,
reason: Optional[str] = None,
headers: Optional[LooseHeaders] = None,
) -> None:
self._body = None
self._keep_alive = None # type: Optional[bool]
self._chunked = False
self._compression = False
self._compression_force = None # type: Optional[ContentCoding]
self._cookies = SimpleCookie() # type: SimpleCookie[str]
self._req = None # type: Optional[BaseRequest]
self._payload_writer = None # type: Optional[AbstractStreamWriter]
self._eof_sent = False
self._body_length = 0
self._state = {} # type: Dict[str, Any]
if headers is not None:
self._headers = CIMultiDict(headers) # type: CIMultiDict[str]
else:
self._headers = CIMultiDict()
self.set_status(status, reason)
@property
def prepared(self) -> bool:
return self._payload_writer is not None
@property
def task(self) -> "Optional[asyncio.Task[None]]":
if self._req:
return self._req.task
else:
return None
@property
def status(self) -> int:
return self._status
@property
def chunked(self) -> bool:
return self._chunked
@property
def compression(self) -> bool:
return self._compression
@property
def reason(self) -> str:
return self._reason
def set_status(
self,
status: int,
reason: Optional[str] = None,
_RESPONSES: Mapping[int, Tuple[str, str]] = RESPONSES,
) -> None:
assert not self.prepared, (
"Cannot change the response status code after " "the headers have been sent"
)
self._status = int(status)
if reason is None:
try:
reason = _RESPONSES[self._status][0]
except Exception:
reason = ""
self._reason = reason
@property
def keep_alive(self) -> Optional[bool]:
return self._keep_alive
def force_close(self) -> None:
self._keep_alive = False
@property
def body_length(self) -> int:
return self._body_length
@property
def output_length(self) -> int:
warnings.warn("output_length is deprecated", DeprecationWarning)
assert self._payload_writer
return self._payload_writer.buffer_size
def enable_chunked_encoding(self, chunk_size: Optional[int] = None) -> None:
"""Enables automatic chunked transfer encoding."""
self._chunked = True
if hdrs.CONTENT_LENGTH in self._headers:
raise RuntimeError(
"You can't enable chunked encoding when " "a content length is set"
)
if chunk_size is not None:
warnings.warn("Chunk size is deprecated #1615", DeprecationWarning)
def enable_compression(
self, force: Optional[Union[bool, ContentCoding]] = None
) -> None:
"""Enables response compression encoding."""
# Backwards compatibility for when force was a bool <0.17.
if type(force) == bool:
force = ContentCoding.deflate if force else ContentCoding.identity
warnings.warn(
"Using boolean for force is deprecated #3318", DeprecationWarning
)
elif force is not None:
assert isinstance(force, ContentCoding), (
"force should one of " "None, bool or " "ContentEncoding"
)
self._compression = True
self._compression_force = force
@property
def headers(self) -> "CIMultiDict[str]":
return self._headers
@property
def cookies(self) -> "SimpleCookie[str]":
return self._cookies
def set_cookie(
self,
name: str,
value: str,
*,
expires: Optional[str] = None,
domain: Optional[str] = None,
max_age: Optional[Union[int, str]] = None,
path: str = "/",
secure: Optional[bool] = None,
httponly: Optional[bool] = None,
version: Optional[str] = None,
samesite: Optional[str] = None,
) -> None:
"""Set or update response cookie.
Sets new cookie or updates existent with new value.
Also updates only those params which are not None.
"""
old = self._cookies.get(name)
if old is not None and old.coded_value == "":
# deleted cookie
self._cookies.pop(name, None)
self._cookies[name] = value
c = self._cookies[name]
if expires is not None:
c["expires"] = expires
elif c.get("expires") == "Thu, 01 Jan 1970 00:00:00 GMT":
del c["expires"]
if domain is not None:
c["domain"] = domain
if max_age is not None:
c["max-age"] = str(max_age)
elif "max-age" in c:
del c["max-age"]
c["path"] = path
if secure is not None:
c["secure"] = secure
if httponly is not None:
c["httponly"] = httponly
if version is not None:
c["version"] = version
if samesite is not None:
c["samesite"] = samesite
def del_cookie(
self, name: str, *, domain: Optional[str] = None, path: str = "/"
) -> None:
"""Delete cookie.
Creates new empty expired cookie.
"""
# TODO: do we need domain/path here?
self._cookies.pop(name, None)
self.set_cookie(
name,
"",
max_age=0,
expires="Thu, 01 Jan 1970 00:00:00 GMT",
domain=domain,
path=path,
)
@property
def content_length(self) -> Optional[int]:
# Just a placeholder for adding setter
return super().content_length
@content_length.setter
def content_length(self, value: Optional[int]) -> None:
if value is not None:
value = int(value)
if self._chunked:
raise RuntimeError(
"You can't set content length when " "chunked encoding is enable"
)
self._headers[hdrs.CONTENT_LENGTH] = str(value)
else:
self._headers.pop(hdrs.CONTENT_LENGTH, None)
@property
def content_type(self) -> str:
# Just a placeholder for adding setter
return super().content_type
@content_type.setter
def content_type(self, value: str) -> None:
self.content_type # read header values if needed
self._content_type = str(value)
self._generate_content_type_header()
@property
def charset(self) -> Optional[str]:
# Just a placeholder for adding setter
return super().charset
@charset.setter
def charset(self, value: Optional[str]) -> None:
ctype = self.content_type # read header values if needed
if ctype == "application/octet-stream":
raise RuntimeError(
"Setting charset for application/octet-stream "
"doesn't make sense, setup content_type first"
)
assert self._content_dict is not None
if value is None:
self._content_dict.pop("charset", None)
else:
self._content_dict["charset"] = str(value).lower()
self._generate_content_type_header()
@property
def last_modified(self) -> Optional[datetime.datetime]:
"""The value of Last-Modified HTTP header, or None.
This header is represented as a `datetime` object.
"""
return parse_http_date(self._headers.get(hdrs.LAST_MODIFIED))
@last_modified.setter
def last_modified(
self, value: Optional[Union[int, float, datetime.datetime, str]]
) -> None:
if value is None:
self._headers.pop(hdrs.LAST_MODIFIED, None)
elif isinstance(value, (int, float)):
self._headers[hdrs.LAST_MODIFIED] = time.strftime(
"%a, %d %b %Y %H:%M:%S GMT", time.gmtime(math.ceil(value))
)
elif isinstance(value, datetime.datetime):
self._headers[hdrs.LAST_MODIFIED] = time.strftime(
"%a, %d %b %Y %H:%M:%S GMT", value.utctimetuple()
)
elif isinstance(value, str):
self._headers[hdrs.LAST_MODIFIED] = value
@property
def etag(self) -> Optional[ETag]:
quoted_value = self._headers.get(hdrs.ETAG)
if not quoted_value:
return None
elif quoted_value == ETAG_ANY:
return ETag(value=ETAG_ANY)
match = QUOTED_ETAG_RE.fullmatch(quoted_value)
if not match:
return None
is_weak, value = match.group(1, 2)
return ETag(
is_weak=bool(is_weak),
value=value,
)
@etag.setter
def etag(self, value: Optional[Union[ETag, str]]) -> None:
if value is None:
self._headers.pop(hdrs.ETAG, None)
elif (isinstance(value, str) and value == ETAG_ANY) or (
isinstance(value, ETag) and value.value == ETAG_ANY
):
self._headers[hdrs.ETAG] = ETAG_ANY
elif isinstance(value, str):
validate_etag_value(value)
self._headers[hdrs.ETAG] = f'"{value}"'
elif isinstance(value, ETag) and isinstance(value.value, str):
validate_etag_value(value.value)
hdr_value = f'W/"{value.value}"' if value.is_weak else f'"{value.value}"'
self._headers[hdrs.ETAG] = hdr_value
else:
raise ValueError(
f"Unsupported etag type: {type(value)}. "
f"etag must be str, ETag or None"
)
def _generate_content_type_header(
self, CONTENT_TYPE: istr = hdrs.CONTENT_TYPE
) -> None:
assert self._content_dict is not None
assert self._content_type is not None
params = "; ".join(f"{k}={v}" for k, v in self._content_dict.items())
if params:
ctype = self._content_type + "; " + params
else:
ctype = self._content_type
self._headers[CONTENT_TYPE] = ctype
async def _do_start_compression(self, coding: ContentCoding) -> None:
if coding != ContentCoding.identity:
assert self._payload_writer is not None
self._headers[hdrs.CONTENT_ENCODING] = coding.value
self._payload_writer.enable_compression(coding.value)
# Compressed payload may have different content length,
# remove the header
self._headers.popall(hdrs.CONTENT_LENGTH, None)
async def _start_compression(self, request: "BaseRequest") -> None:
if self._compression_force:
await self._do_start_compression(self._compression_force)
else:
accept_encoding = request.headers.get(hdrs.ACCEPT_ENCODING, "").lower()
for coding in ContentCoding:
if coding.value in accept_encoding:
await self._do_start_compression(coding)
return
async def prepare(self, request: "BaseRequest") -> Optional[AbstractStreamWriter]:
if self._eof_sent:
return None
if self._payload_writer is not None:
return self._payload_writer
return await self._start(request)
async def _start(self, request: "BaseRequest") -> AbstractStreamWriter:
self._req = request
writer = self._payload_writer = request._payload_writer
await self._prepare_headers()
await request._prepare_hook(self)
await self._write_headers()
return writer
async def _prepare_headers(self) -> None:
request = self._req
assert request is not None
writer = self._payload_writer
assert writer is not None
keep_alive = self._keep_alive
if keep_alive is None:
keep_alive = request.keep_alive
self._keep_alive = keep_alive
version = request.version
headers = self._headers
for cookie in self._cookies.values():
value = cookie.output(header="")[1:]
headers.add(hdrs.SET_COOKIE, value)
if self._compression:
await self._start_compression(request)
if self._chunked:
if version != HttpVersion11:
raise RuntimeError(
"Using chunked encoding is forbidden "
"for HTTP/{0.major}.{0.minor}".format(request.version)
)
writer.enable_chunking()
headers[hdrs.TRANSFER_ENCODING] = "chunked"
if hdrs.CONTENT_LENGTH in headers:
del headers[hdrs.CONTENT_LENGTH]
elif self._length_check:
writer.length = self.content_length
if writer.length is None:
if version >= HttpVersion11 and self.status != 204:
writer.enable_chunking()
headers[hdrs.TRANSFER_ENCODING] = "chunked"
if hdrs.CONTENT_LENGTH in headers:
del headers[hdrs.CONTENT_LENGTH]
else:
keep_alive = False
# HTTP 1.1: https://tools.ietf.org/html/rfc7230#section-3.3.2
# HTTP 1.0: https://tools.ietf.org/html/rfc1945#section-10.4
elif version >= HttpVersion11 and self.status in (100, 101, 102, 103, 204):
del headers[hdrs.CONTENT_LENGTH]
if self.status not in (204, 304):
headers.setdefault(hdrs.CONTENT_TYPE, "application/octet-stream")
headers.setdefault(hdrs.DATE, rfc822_formatted_time())
headers.setdefault(hdrs.SERVER, SERVER_SOFTWARE)
# connection header
if hdrs.CONNECTION not in headers:
if keep_alive:
if version == HttpVersion10:
headers[hdrs.CONNECTION] = "keep-alive"
else:
if version == HttpVersion11:
headers[hdrs.CONNECTION] = "close"
async def _write_headers(self) -> None:
request = self._req
assert request is not None
writer = self._payload_writer
assert writer is not None
# status line
version = request.version
status_line = "HTTP/{}.{} {} {}".format(
version[0], version[1], self._status, self._reason
)
await writer.write_headers(status_line, self._headers)
async def write(self, data: bytes) -> None:
assert isinstance(
data, (bytes, bytearray, memoryview)
), "data argument must be byte-ish (%r)" % type(data)
if self._eof_sent:
raise RuntimeError("Cannot call write() after write_eof()")
if self._payload_writer is None:
raise RuntimeError("Cannot call write() before prepare()")
await self._payload_writer.write(data)
async def drain(self) -> None:
assert not self._eof_sent, "EOF has already been sent"
assert self._payload_writer is not None, "Response has not been started"
warnings.warn(
"drain method is deprecated, use await resp.write()",
DeprecationWarning,
stacklevel=2,
)
await self._payload_writer.drain()
async def write_eof(self, data: bytes = b"") -> None:
assert isinstance(
data, (bytes, bytearray, memoryview)
), "data argument must be byte-ish (%r)" % type(data)
if self._eof_sent:
return
assert self._payload_writer is not None, "Response has not been started"
await self._payload_writer.write_eof(data)
self._eof_sent = True
self._req = None
self._body_length = self._payload_writer.output_size
self._payload_writer = None
def __repr__(self) -> str:
if self._eof_sent:
info = "eof"
elif self.prepared:
assert self._req is not None
info = f"{self._req.method} {self._req.path} "
else:
info = "not prepared"
return f"<{self.__class__.__name__} {self.reason} {info}>"
def __getitem__(self, key: str) -> Any:
return self._state[key]
def __setitem__(self, key: str, value: Any) -> None:
self._state[key] = value
def __delitem__(self, key: str) -> None:
del self._state[key]
def __len__(self) -> int:
return len(self._state)
def __iter__(self) -> Iterator[str]:
return iter(self._state)
def __hash__(self) -> int:
return hash(id(self))
def __eq__(self, other: object) -> bool:
return self is other
class Response(StreamResponse):
def __init__(
self,
*,
body: Any = None,
status: int = 200,
reason: Optional[str] = None,
text: Optional[str] = None,
headers: Optional[LooseHeaders] = None,
content_type: Optional[str] = None,
charset: Optional[str] = None,
zlib_executor_size: Optional[int] = None,
zlib_executor: Optional[Executor] = None,
) -> None:
if body is not None and text is not None:
raise ValueError("body and text are not allowed together")
if headers is None:
real_headers = CIMultiDict() # type: CIMultiDict[str]
elif not isinstance(headers, CIMultiDict):
real_headers = CIMultiDict(headers)
else:
real_headers = headers # = cast('CIMultiDict[str]', headers)
if content_type is not None and "charset" in content_type:
raise ValueError("charset must not be in content_type " "argument")
if text is not None:
if hdrs.CONTENT_TYPE in real_headers:
if content_type or charset:
raise ValueError(
"passing both Content-Type header and "
"content_type or charset params "
"is forbidden"
)
else:
# fast path for filling headers
if not isinstance(text, str):
raise TypeError("text argument must be str (%r)" % type(text))
if content_type is None:
content_type = "text/plain"
if charset is None:
charset = "utf-8"
real_headers[hdrs.CONTENT_TYPE] = content_type + "; charset=" + charset
body = text.encode(charset)
text = None
else:
if hdrs.CONTENT_TYPE in real_headers:
if content_type is not None or charset is not None:
raise ValueError(
"passing both Content-Type header and "
"content_type or charset params "
"is forbidden"
)
else:
if content_type is not None:
if charset is not None:
content_type += "; charset=" + charset
real_headers[hdrs.CONTENT_TYPE] = content_type
super().__init__(status=status, reason=reason, headers=real_headers)
if text is not None:
self.text = text
else:
self.body = body
self._compressed_body = None # type: Optional[bytes]
self._zlib_executor_size = zlib_executor_size
self._zlib_executor = zlib_executor
@property
def body(self) -> Optional[Union[bytes, Payload]]:
return self._body
@body.setter
def body(
self,
body: bytes,
CONTENT_TYPE: istr = hdrs.CONTENT_TYPE,
CONTENT_LENGTH: istr = hdrs.CONTENT_LENGTH,
) -> None:
if body is None:
self._body = None # type: Optional[bytes]
self._body_payload = False # type: bool
elif isinstance(body, (bytes, bytearray)):
self._body = body
self._body_payload = False
else:
try:
self._body = body = payload.PAYLOAD_REGISTRY.get(body)
except payload.LookupError:
raise ValueError("Unsupported body type %r" % type(body))
self._body_payload = True
headers = self._headers
# set content-length header if needed
if not self._chunked and CONTENT_LENGTH not in headers:
size = body.size
if size is not None:
headers[CONTENT_LENGTH] = str(size)
# set content-type
if CONTENT_TYPE not in headers:
headers[CONTENT_TYPE] = body.content_type
# copy payload headers
if body.headers:
for (key, value) in body.headers.items():
if key not in headers:
headers[key] = value
self._compressed_body = None
@property
def text(self) -> Optional[str]:
if self._body is None:
return None
return self._body.decode(self.charset or "utf-8")
@text.setter
def text(self, text: str) -> None:
assert text is None or isinstance(
text, str
), "text argument must be str (%r)" % type(text)
if self.content_type == "application/octet-stream":
self.content_type = "text/plain"
if self.charset is None:
self.charset = "utf-8"
self._body = text.encode(self.charset)
self._body_payload = False
self._compressed_body = None
@property
def content_length(self) -> Optional[int]:
if self._chunked:
return None
if hdrs.CONTENT_LENGTH in self._headers:
return super().content_length
if self._compressed_body is not None:
# Return length of the compressed body
return len(self._compressed_body)
elif self._body_payload:
# A payload without content length, or a compressed payload
return None
elif self._body is not None:
return len(self._body)
else:
return 0
@content_length.setter
def content_length(self, value: Optional[int]) -> None:
raise RuntimeError("Content length is set automatically")
async def write_eof(self, data: bytes = b"") -> None:
if self._eof_sent:
return
if self._compressed_body is None:
body = self._body # type: Optional[Union[bytes, Payload]]
else:
body = self._compressed_body
assert not data, f"data arg is not supported, got {data!r}"
assert self._req is not None
assert self._payload_writer is not None
if body is not None:
if self._req._method == hdrs.METH_HEAD or self._status in [204, 304]:
await super().write_eof()
elif self._body_payload:
payload = cast(Payload, body)
await payload.write(self._payload_writer)
await super().write_eof()
else:
await super().write_eof(cast(bytes, body))
else:
await super().write_eof()
async def _start(self, request: "BaseRequest") -> AbstractStreamWriter:
if not self._chunked and hdrs.CONTENT_LENGTH not in self._headers:
if not self._body_payload:
if self._body is not None:
self._headers[hdrs.CONTENT_LENGTH] = str(len(self._body))
else:
self._headers[hdrs.CONTENT_LENGTH] = "0"
return await super()._start(request)
def _compress_body(self, zlib_mode: int) -> None:
assert zlib_mode > 0
compressobj = zlib.compressobj(wbits=zlib_mode)
body_in = self._body
assert body_in is not None
self._compressed_body = compressobj.compress(body_in) + compressobj.flush()
async def _do_start_compression(self, coding: ContentCoding) -> None:
if self._body_payload or self._chunked:
return await super()._do_start_compression(coding)
if coding != ContentCoding.identity:
# Instead of using _payload_writer.enable_compression,
# compress the whole body
zlib_mode = (
16 + zlib.MAX_WBITS if coding == ContentCoding.gzip else zlib.MAX_WBITS
)
body_in = self._body
assert body_in is not None
if (
self._zlib_executor_size is not None
and len(body_in) > self._zlib_executor_size
):
await asyncio.get_event_loop().run_in_executor(
self._zlib_executor, self._compress_body, zlib_mode
)
else:
self._compress_body(zlib_mode)
body_out = self._compressed_body
assert body_out is not None
self._headers[hdrs.CONTENT_ENCODING] = coding.value
self._headers[hdrs.CONTENT_LENGTH] = str(len(body_out))
def json_response(
data: Any = sentinel,
*,
text: Optional[str] = None,
body: Optional[bytes] = None,
status: int = 200,
reason: Optional[str] = None,
headers: Optional[LooseHeaders] = None,
content_type: str = "application/json",
dumps: JSONEncoder = json.dumps,
) -> Response:
if data is not sentinel:
if text or body:
raise ValueError("only one of data, text, or body should be specified")
else:
text = dumps(data)
return Response(
text=text,
body=body,
status=status,
reason=reason,
headers=headers,
content_type=content_type,
)
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