diff options
author | cyfraeviolae <cyfraeviolae> | 2024-04-03 03:10:44 -0400 |
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committer | cyfraeviolae <cyfraeviolae> | 2024-04-03 03:10:44 -0400 |
commit | 6d7ba58f880be618ade07f8ea080fe8c4bf8a896 (patch) | |
tree | b1c931051ffcebd2bd9d61d98d6233ffa289bbce /venv/lib/python3.11/site-packages/h11/_writers.py | |
parent | 4f884c9abc32990b4061a1bb6997b4b37e58ea0b (diff) |
venv
Diffstat (limited to 'venv/lib/python3.11/site-packages/h11/_writers.py')
-rw-r--r-- | venv/lib/python3.11/site-packages/h11/_writers.py | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/venv/lib/python3.11/site-packages/h11/_writers.py b/venv/lib/python3.11/site-packages/h11/_writers.py new file mode 100644 index 0000000..939cdb9 --- /dev/null +++ b/venv/lib/python3.11/site-packages/h11/_writers.py @@ -0,0 +1,145 @@ +# Code to read HTTP data +# +# Strategy: each writer takes an event + a write-some-bytes function, which is +# calls. +# +# WRITERS is a dict describing how to pick a reader. It maps states to either: +# - a writer +# - or, for body writers, a dict of framin-dependent writer factories + +from typing import Any, Callable, Dict, List, Tuple, Type, Union + +from ._events import Data, EndOfMessage, Event, InformationalResponse, Request, Response +from ._headers import Headers +from ._state import CLIENT, IDLE, SEND_BODY, SEND_RESPONSE, SERVER +from ._util import LocalProtocolError, Sentinel + +__all__ = ["WRITERS"] + +Writer = Callable[[bytes], Any] + + +def write_headers(headers: Headers, write: Writer) -> None: + # "Since the Host field-value is critical information for handling a + # request, a user agent SHOULD generate Host as the first header field + # following the request-line." - RFC 7230 + raw_items = headers._full_items + for raw_name, name, value in raw_items: + if name == b"host": + write(b"%s: %s\r\n" % (raw_name, value)) + for raw_name, name, value in raw_items: + if name != b"host": + write(b"%s: %s\r\n" % (raw_name, value)) + write(b"\r\n") + + +def write_request(request: Request, write: Writer) -> None: + if request.http_version != b"1.1": + raise LocalProtocolError("I only send HTTP/1.1") + write(b"%s %s HTTP/1.1\r\n" % (request.method, request.target)) + write_headers(request.headers, write) + + +# Shared between InformationalResponse and Response +def write_any_response( + response: Union[InformationalResponse, Response], write: Writer +) -> None: + if response.http_version != b"1.1": + raise LocalProtocolError("I only send HTTP/1.1") + status_bytes = str(response.status_code).encode("ascii") + # We don't bother sending ascii status messages like "OK"; they're + # optional and ignored by the protocol. (But the space after the numeric + # status code is mandatory.) + # + # XX FIXME: could at least make an effort to pull out the status message + # from stdlib's http.HTTPStatus table. Or maybe just steal their enums + # (either by import or copy/paste). We already accept them as status codes + # since they're of type IntEnum < int. + write(b"HTTP/1.1 %s %s\r\n" % (status_bytes, response.reason)) + write_headers(response.headers, write) + + +class BodyWriter: + def __call__(self, event: Event, write: Writer) -> None: + if type(event) is Data: + self.send_data(event.data, write) + elif type(event) is EndOfMessage: + self.send_eom(event.headers, write) + else: # pragma: no cover + assert False + + def send_data(self, data: bytes, write: Writer) -> None: + pass + + def send_eom(self, headers: Headers, write: Writer) -> None: + pass + + +# +# These are all careful not to do anything to 'data' except call len(data) and +# write(data). This allows us to transparently pass-through funny objects, +# like placeholder objects referring to files on disk that will be sent via +# sendfile(2). +# +class ContentLengthWriter(BodyWriter): + def __init__(self, length: int) -> None: + self._length = length + + def send_data(self, data: bytes, write: Writer) -> None: + self._length -= len(data) + if self._length < 0: + raise LocalProtocolError("Too much data for declared Content-Length") + write(data) + + def send_eom(self, headers: Headers, write: Writer) -> None: + if self._length != 0: + raise LocalProtocolError("Too little data for declared Content-Length") + if headers: + raise LocalProtocolError("Content-Length and trailers don't mix") + + +class ChunkedWriter(BodyWriter): + def send_data(self, data: bytes, write: Writer) -> None: + # if we encoded 0-length data in the naive way, it would look like an + # end-of-message. + if not data: + return + write(b"%x\r\n" % len(data)) + write(data) + write(b"\r\n") + + def send_eom(self, headers: Headers, write: Writer) -> None: + write(b"0\r\n") + write_headers(headers, write) + + +class Http10Writer(BodyWriter): + def send_data(self, data: bytes, write: Writer) -> None: + write(data) + + def send_eom(self, headers: Headers, write: Writer) -> None: + if headers: + raise LocalProtocolError("can't send trailers to HTTP/1.0 client") + # no need to close the socket ourselves, that will be taken care of by + # Connection: close machinery + + +WritersType = Dict[ + Union[Tuple[Type[Sentinel], Type[Sentinel]], Type[Sentinel]], + Union[ + Dict[str, Type[BodyWriter]], + Callable[[Union[InformationalResponse, Response], Writer], None], + Callable[[Request, Writer], None], + ], +] + +WRITERS: WritersType = { + (CLIENT, IDLE): write_request, + (SERVER, IDLE): write_any_response, + (SERVER, SEND_RESPONSE): write_any_response, + SEND_BODY: { + "chunked": ChunkedWriter, + "content-length": ContentLengthWriter, + "http/1.0": Http10Writer, + }, +} |