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267 lines
8.2 KiB
Python
267 lines
8.2 KiB
Python
from __future__ import annotations
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import io
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import typing
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from base64 import b64encode
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from enum import Enum
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from ..exceptions import UnrewindableBodyError
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from .util import to_bytes
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if typing.TYPE_CHECKING:
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from typing import Final
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# Pass as a value within ``headers`` to skip
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# emitting some HTTP headers that are added automatically.
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# The only headers that are supported are ``Accept-Encoding``,
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# ``Host``, and ``User-Agent``.
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SKIP_HEADER = "@@@SKIP_HEADER@@@"
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SKIPPABLE_HEADERS = frozenset(["accept-encoding", "host", "user-agent"])
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ACCEPT_ENCODING = "gzip,deflate"
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try:
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try:
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import brotlicffi as _unused_module_brotli # type: ignore[import-not-found] # noqa: F401
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except ImportError:
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import brotli as _unused_module_brotli # type: ignore[import-not-found] # noqa: F401
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except ImportError:
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pass
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else:
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ACCEPT_ENCODING += ",br"
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try:
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from compression import ( # type: ignore[import-not-found] # noqa: F401
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zstd as _unused_module_zstd,
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)
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ACCEPT_ENCODING += ",zstd"
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except ImportError:
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try:
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import zstandard as _unused_module_zstd # noqa: F401
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ACCEPT_ENCODING += ",zstd"
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except ImportError:
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pass
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class _TYPE_FAILEDTELL(Enum):
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token = 0
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_FAILEDTELL: Final[_TYPE_FAILEDTELL] = _TYPE_FAILEDTELL.token
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_TYPE_BODY_POSITION = typing.Union[int, _TYPE_FAILEDTELL]
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# When sending a request with these methods we aren't expecting
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# a body so don't need to set an explicit 'Content-Length: 0'
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# The reason we do this in the negative instead of tracking methods
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# which 'should' have a body is because unknown methods should be
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# treated as if they were 'POST' which *does* expect a body.
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_METHODS_NOT_EXPECTING_BODY = {"GET", "HEAD", "DELETE", "TRACE", "OPTIONS", "CONNECT"}
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def make_headers(
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keep_alive: bool | None = None,
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accept_encoding: bool | list[str] | str | None = None,
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user_agent: str | None = None,
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basic_auth: str | None = None,
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proxy_basic_auth: str | None = None,
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disable_cache: bool | None = None,
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) -> dict[str, str]:
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"""
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Shortcuts for generating request headers.
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:param keep_alive:
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If ``True``, adds 'connection: keep-alive' header.
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:param accept_encoding:
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Can be a boolean, list, or string.
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``True`` translates to 'gzip,deflate'. If the dependencies for
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Brotli (either the ``brotli`` or ``brotlicffi`` package) and/or Zstandard
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(the ``zstandard`` package) algorithms are installed, then their encodings are
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included in the string ('br' and 'zstd', respectively).
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List will get joined by comma.
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String will be used as provided.
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:param user_agent:
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String representing the user-agent you want, such as
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"python-urllib3/0.6"
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:param basic_auth:
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Colon-separated username:password string for 'authorization: basic ...'
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auth header.
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:param proxy_basic_auth:
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Colon-separated username:password string for 'proxy-authorization: basic ...'
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auth header.
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:param disable_cache:
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If ``True``, adds 'cache-control: no-cache' header.
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Example:
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.. code-block:: python
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import urllib3
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print(urllib3.util.make_headers(keep_alive=True, user_agent="Batman/1.0"))
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# {'connection': 'keep-alive', 'user-agent': 'Batman/1.0'}
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print(urllib3.util.make_headers(accept_encoding=True))
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# {'accept-encoding': 'gzip,deflate'}
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"""
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headers: dict[str, str] = {}
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if accept_encoding:
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if isinstance(accept_encoding, str):
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pass
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elif isinstance(accept_encoding, list):
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accept_encoding = ",".join(accept_encoding)
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else:
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accept_encoding = ACCEPT_ENCODING
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headers["accept-encoding"] = accept_encoding
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if user_agent:
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headers["user-agent"] = user_agent
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if keep_alive:
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headers["connection"] = "keep-alive"
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if basic_auth:
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headers["authorization"] = (
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f"Basic {b64encode(basic_auth.encode('latin-1')).decode()}"
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)
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if proxy_basic_auth:
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headers["proxy-authorization"] = (
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f"Basic {b64encode(proxy_basic_auth.encode('latin-1')).decode()}"
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)
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if disable_cache:
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headers["cache-control"] = "no-cache"
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return headers
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def set_file_position(
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body: typing.Any, pos: _TYPE_BODY_POSITION | None
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) -> _TYPE_BODY_POSITION | None:
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"""
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If a position is provided, move file to that point.
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Otherwise, we'll attempt to record a position for future use.
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"""
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if pos is not None:
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rewind_body(body, pos)
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elif getattr(body, "tell", None) is not None:
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try:
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pos = body.tell()
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except OSError:
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# This differentiates from None, allowing us to catch
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# a failed `tell()` later when trying to rewind the body.
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pos = _FAILEDTELL
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return pos
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def rewind_body(body: typing.IO[typing.AnyStr], body_pos: _TYPE_BODY_POSITION) -> None:
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"""
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Attempt to rewind body to a certain position.
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Primarily used for request redirects and retries.
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:param body:
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File-like object that supports seek.
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:param int pos:
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Position to seek to in file.
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"""
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body_seek = getattr(body, "seek", None)
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if body_seek is not None and isinstance(body_pos, int):
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try:
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body_seek(body_pos)
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except OSError as e:
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raise UnrewindableBodyError(
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"An error occurred when rewinding request body for redirect/retry."
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) from e
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elif body_pos is _FAILEDTELL:
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raise UnrewindableBodyError(
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"Unable to record file position for rewinding "
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"request body during a redirect/retry."
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)
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else:
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raise ValueError(
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f"body_pos must be of type integer, instead it was {type(body_pos)}."
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)
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class ChunksAndContentLength(typing.NamedTuple):
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chunks: typing.Iterable[bytes] | None
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content_length: int | None
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def body_to_chunks(
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body: typing.Any | None, method: str, blocksize: int
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) -> ChunksAndContentLength:
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"""Takes the HTTP request method, body, and blocksize and
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transforms them into an iterable of chunks to pass to
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socket.sendall() and an optional 'Content-Length' header.
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A 'Content-Length' of 'None' indicates the length of the body
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can't be determined so should use 'Transfer-Encoding: chunked'
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for framing instead.
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"""
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chunks: typing.Iterable[bytes] | None
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content_length: int | None
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# No body, we need to make a recommendation on 'Content-Length'
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# based on whether that request method is expected to have
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# a body or not.
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if body is None:
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chunks = None
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if method.upper() not in _METHODS_NOT_EXPECTING_BODY:
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content_length = 0
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else:
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content_length = None
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# Bytes or strings become bytes
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elif isinstance(body, (str, bytes)):
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chunks = (to_bytes(body),)
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content_length = len(chunks[0])
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# File-like object, TODO: use seek() and tell() for length?
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elif hasattr(body, "read"):
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def chunk_readable() -> typing.Iterable[bytes]:
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nonlocal body, blocksize
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encode = isinstance(body, io.TextIOBase)
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while True:
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datablock = body.read(blocksize)
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if not datablock:
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break
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if encode:
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datablock = datablock.encode("utf-8")
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yield datablock
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chunks = chunk_readable()
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content_length = None
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# Otherwise we need to start checking via duck-typing.
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else:
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try:
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# Check if the body implements the buffer API.
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mv = memoryview(body)
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except TypeError:
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try:
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# Check if the body is an iterable
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chunks = iter(body)
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content_length = None
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except TypeError:
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raise TypeError(
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f"'body' must be a bytes-like object, file-like "
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f"object, or iterable. Instead was {body!r}"
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) from None
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else:
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# Since it implements the buffer API can be passed directly to socket.sendall()
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chunks = (body,)
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content_length = mv.nbytes
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return ChunksAndContentLength(chunks=chunks, content_length=content_length)
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