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Diffstat (limited to 'venv/lib/python3.11/site-packages/h11/_events.py')
| -rw-r--r-- | venv/lib/python3.11/site-packages/h11/_events.py | 369 |
1 files changed, 369 insertions, 0 deletions
diff --git a/venv/lib/python3.11/site-packages/h11/_events.py b/venv/lib/python3.11/site-packages/h11/_events.py new file mode 100644 index 0000000..075bf8a --- /dev/null +++ b/venv/lib/python3.11/site-packages/h11/_events.py @@ -0,0 +1,369 @@ +# High level events that make up HTTP/1.1 conversations. Loosely inspired by +# the corresponding events in hyper-h2: +# +# http://python-hyper.org/h2/en/stable/api.html#events +# +# Don't subclass these. Stuff will break. + +import re +from abc import ABC +from dataclasses import dataclass, field +from typing import Any, cast, Dict, List, Tuple, Union + +from ._abnf import method, request_target +from ._headers import Headers, normalize_and_validate +from ._util import bytesify, LocalProtocolError, validate + +# Everything in __all__ gets re-exported as part of the h11 public API. +__all__ = [ + "Event", + "Request", + "InformationalResponse", + "Response", + "Data", + "EndOfMessage", + "ConnectionClosed", +] + +method_re = re.compile(method.encode("ascii")) +request_target_re = re.compile(request_target.encode("ascii")) + + +class Event(ABC): + """ + Base class for h11 events. + """ + + __slots__ = () + + +@dataclass(init=False, frozen=True) +class Request(Event): + """The beginning of an HTTP request. + + Fields: + + .. attribute:: method + + An HTTP method, e.g. ``b"GET"`` or ``b"POST"``. Always a byte + string. :term:`Bytes-like objects <bytes-like object>` and native + strings containing only ascii characters will be automatically + converted to byte strings. + + .. attribute:: target + + The target of an HTTP request, e.g. ``b"/index.html"``, or one of the + more exotic formats described in `RFC 7320, section 5.3 + <https://tools.ietf.org/html/rfc7230#section-5.3>`_. Always a byte + string. :term:`Bytes-like objects <bytes-like object>` and native + strings containing only ascii characters will be automatically + converted to byte strings. + + .. attribute:: headers + + Request headers, represented as a list of (name, value) pairs. See + :ref:`the header normalization rules <headers-format>` for details. + + .. attribute:: http_version + + The HTTP protocol version, represented as a byte string like + ``b"1.1"``. See :ref:`the HTTP version normalization rules + <http_version-format>` for details. + + """ + + __slots__ = ("method", "headers", "target", "http_version") + + method: bytes + headers: Headers + target: bytes + http_version: bytes + + def __init__( + self, + *, + method: Union[bytes, str], + headers: Union[Headers, List[Tuple[bytes, bytes]], List[Tuple[str, str]]], + target: Union[bytes, str], + http_version: Union[bytes, str] = b"1.1", + _parsed: bool = False, + ) -> None: + super().__init__() + if isinstance(headers, Headers): + object.__setattr__(self, "headers", headers) + else: + object.__setattr__( + self, "headers", normalize_and_validate(headers, _parsed=_parsed) + ) + if not _parsed: + object.__setattr__(self, "method", bytesify(method)) + object.__setattr__(self, "target", bytesify(target)) + object.__setattr__(self, "http_version", bytesify(http_version)) + else: + object.__setattr__(self, "method", method) + object.__setattr__(self, "target", target) + object.__setattr__(self, "http_version", http_version) + + # "A server MUST respond with a 400 (Bad Request) status code to any + # HTTP/1.1 request message that lacks a Host header field and to any + # request message that contains more than one Host header field or a + # Host header field with an invalid field-value." + # -- https://tools.ietf.org/html/rfc7230#section-5.4 + host_count = 0 + for name, value in self.headers: + if name == b"host": + host_count += 1 + if self.http_version == b"1.1" and host_count == 0: + raise LocalProtocolError("Missing mandatory Host: header") + if host_count > 1: + raise LocalProtocolError("Found multiple Host: headers") + + validate(method_re, self.method, "Illegal method characters") + validate(request_target_re, self.target, "Illegal target characters") + + # This is an unhashable type. + __hash__ = None # type: ignore + + +@dataclass(init=False, frozen=True) +class _ResponseBase(Event): + __slots__ = ("headers", "http_version", "reason", "status_code") + + headers: Headers + http_version: bytes + reason: bytes + status_code: int + + def __init__( + self, + *, + headers: Union[Headers, List[Tuple[bytes, bytes]], List[Tuple[str, str]]], + status_code: int, + http_version: Union[bytes, str] = b"1.1", + reason: Union[bytes, str] = b"", + _parsed: bool = False, + ) -> None: + super().__init__() + if isinstance(headers, Headers): + object.__setattr__(self, "headers", headers) + else: + object.__setattr__( + self, "headers", normalize_and_validate(headers, _parsed=_parsed) + ) + if not _parsed: + object.__setattr__(self, "reason", bytesify(reason)) + object.__setattr__(self, "http_version", bytesify(http_version)) + if not isinstance(status_code, int): + raise LocalProtocolError("status code must be integer") + # Because IntEnum objects are instances of int, but aren't + # duck-compatible (sigh), see gh-72. + object.__setattr__(self, "status_code", int(status_code)) + else: + object.__setattr__(self, "reason", reason) + object.__setattr__(self, "http_version", http_version) + object.__setattr__(self, "status_code", status_code) + + self.__post_init__() + + def __post_init__(self) -> None: + pass + + # This is an unhashable type. + __hash__ = None # type: ignore + + +@dataclass(init=False, frozen=True) +class InformationalResponse(_ResponseBase): + """An HTTP informational response. + + Fields: + + .. attribute:: status_code + + The status code of this response, as an integer. For an + :class:`InformationalResponse`, this is always in the range [100, + 200). + + .. attribute:: headers + + Request headers, represented as a list of (name, value) pairs. See + :ref:`the header normalization rules <headers-format>` for + details. + + .. attribute:: http_version + + The HTTP protocol version, represented as a byte string like + ``b"1.1"``. See :ref:`the HTTP version normalization rules + <http_version-format>` for details. + + .. attribute:: reason + + The reason phrase of this response, as a byte string. For example: + ``b"OK"``, or ``b"Not Found"``. + + """ + + def __post_init__(self) -> None: + if not (100 <= self.status_code < 200): + raise LocalProtocolError( + "InformationalResponse status_code should be in range " + "[100, 200), not {}".format(self.status_code) + ) + + # This is an unhashable type. + __hash__ = None # type: ignore + + +@dataclass(init=False, frozen=True) +class Response(_ResponseBase): + """The beginning of an HTTP response. + + Fields: + + .. attribute:: status_code + + The status code of this response, as an integer. For an + :class:`Response`, this is always in the range [200, + 1000). + + .. attribute:: headers + + Request headers, represented as a list of (name, value) pairs. See + :ref:`the header normalization rules <headers-format>` for details. + + .. attribute:: http_version + + The HTTP protocol version, represented as a byte string like + ``b"1.1"``. See :ref:`the HTTP version normalization rules + <http_version-format>` for details. + + .. attribute:: reason + + The reason phrase of this response, as a byte string. For example: + ``b"OK"``, or ``b"Not Found"``. + + """ + + def __post_init__(self) -> None: + if not (200 <= self.status_code < 1000): + raise LocalProtocolError( + "Response status_code should be in range [200, 1000), not {}".format( + self.status_code + ) + ) + + # This is an unhashable type. + __hash__ = None # type: ignore + + +@dataclass(init=False, frozen=True) +class Data(Event): + """Part of an HTTP message body. + + Fields: + + .. attribute:: data + + A :term:`bytes-like object` containing part of a message body. Or, if + using the ``combine=False`` argument to :meth:`Connection.send`, then + any object that your socket writing code knows what to do with, and for + which calling :func:`len` returns the number of bytes that will be + written -- see :ref:`sendfile` for details. + + .. attribute:: chunk_start + + A marker that indicates whether this data object is from the start of a + chunked transfer encoding chunk. This field is ignored when when a Data + event is provided to :meth:`Connection.send`: it is only valid on + events emitted from :meth:`Connection.next_event`. You probably + shouldn't use this attribute at all; see + :ref:`chunk-delimiters-are-bad` for details. + + .. attribute:: chunk_end + + A marker that indicates whether this data object is the last for a + given chunked transfer encoding chunk. This field is ignored when when + a Data event is provided to :meth:`Connection.send`: it is only valid + on events emitted from :meth:`Connection.next_event`. You probably + shouldn't use this attribute at all; see + :ref:`chunk-delimiters-are-bad` for details. + + """ + + __slots__ = ("data", "chunk_start", "chunk_end") + + data: bytes + chunk_start: bool + chunk_end: bool + + def __init__( + self, data: bytes, chunk_start: bool = False, chunk_end: bool = False + ) -> None: + object.__setattr__(self, "data", data) + object.__setattr__(self, "chunk_start", chunk_start) + object.__setattr__(self, "chunk_end", chunk_end) + + # This is an unhashable type. + __hash__ = None # type: ignore + + +# XX FIXME: "A recipient MUST ignore (or consider as an error) any fields that +# are forbidden to be sent in a trailer, since processing them as if they were +# present in the header section might bypass external security filters." +# https://svn.tools.ietf.org/svn/wg/httpbis/specs/rfc7230.html#chunked.trailer.part +# Unfortunately, the list of forbidden fields is long and vague :-/ +@dataclass(init=False, frozen=True) +class EndOfMessage(Event): + """The end of an HTTP message. + + Fields: + + .. attribute:: headers + + Default value: ``[]`` + + Any trailing headers attached to this message, represented as a list of + (name, value) pairs. See :ref:`the header normalization rules + <headers-format>` for details. + + Must be empty unless ``Transfer-Encoding: chunked`` is in use. + + """ + + __slots__ = ("headers",) + + headers: Headers + + def __init__( + self, + *, + headers: Union[ + Headers, List[Tuple[bytes, bytes]], List[Tuple[str, str]], None + ] = None, + _parsed: bool = False, + ) -> None: + super().__init__() + if headers is None: + headers = Headers([]) + elif not isinstance(headers, Headers): + headers = normalize_and_validate(headers, _parsed=_parsed) + + object.__setattr__(self, "headers", headers) + + # This is an unhashable type. + __hash__ = None # type: ignore + + +@dataclass(frozen=True) +class ConnectionClosed(Event): + """This event indicates that the sender has closed their outgoing + connection. + + Note that this does not necessarily mean that they can't *receive* further + data, because TCP connections are composed to two one-way channels which + can be closed independently. See :ref:`closing` for details. + + No fields. + """ + + pass |