777 lines
28 KiB
Python
777 lines
28 KiB
Python
import abc
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import asyncio
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import collections
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import re
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import string
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import zlib
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from enum import IntEnum
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from typing import Any, List, Optional, Tuple, Type, Union # noqa
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from multidict import CIMultiDict, CIMultiDictProxy, istr
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from yarl import URL
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from . import hdrs
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from .base_protocol import BaseProtocol
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from .helpers import NO_EXTENSIONS, BaseTimerContext
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from .http_exceptions import (
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BadStatusLine,
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ContentEncodingError,
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ContentLengthError,
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InvalidHeader,
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LineTooLong,
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TransferEncodingError,
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)
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from .http_writer import HttpVersion, HttpVersion10
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from .log import internal_logger
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from .streams import EMPTY_PAYLOAD, StreamReader
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from .typedefs import RawHeaders
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try:
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import brotli
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HAS_BROTLI = True
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except ImportError: # pragma: no cover
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HAS_BROTLI = False
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__all__ = (
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'HeadersParser', 'HttpParser', 'HttpRequestParser', 'HttpResponseParser',
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'RawRequestMessage', 'RawResponseMessage')
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ASCIISET = set(string.printable)
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# See https://tools.ietf.org/html/rfc7230#section-3.1.1
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# and https://tools.ietf.org/html/rfc7230#appendix-B
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#
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# method = token
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# tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*" / "+" / "-" / "." /
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# "^" / "_" / "`" / "|" / "~" / DIGIT / ALPHA
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# token = 1*tchar
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METHRE = re.compile(r"[!#$%&'*+\-.^_`|~0-9A-Za-z]+")
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VERSRE = re.compile(r'HTTP/(\d+).(\d+)')
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HDRRE = re.compile(rb'[\x00-\x1F\x7F()<>@,;:\[\]={} \t\\\\\"]')
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RawRequestMessage = collections.namedtuple(
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'RawRequestMessage',
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['method', 'path', 'version', 'headers', 'raw_headers',
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'should_close', 'compression', 'upgrade', 'chunked', 'url'])
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RawResponseMessage = collections.namedtuple(
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'RawResponseMessage',
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['version', 'code', 'reason', 'headers', 'raw_headers',
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'should_close', 'compression', 'upgrade', 'chunked'])
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class ParseState(IntEnum):
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PARSE_NONE = 0
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PARSE_LENGTH = 1
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PARSE_CHUNKED = 2
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PARSE_UNTIL_EOF = 3
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class ChunkState(IntEnum):
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PARSE_CHUNKED_SIZE = 0
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PARSE_CHUNKED_CHUNK = 1
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PARSE_CHUNKED_CHUNK_EOF = 2
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PARSE_MAYBE_TRAILERS = 3
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PARSE_TRAILERS = 4
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class HeadersParser:
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def __init__(self,
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max_line_size: int=8190,
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max_headers: int=32768,
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max_field_size: int=8190) -> None:
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self.max_line_size = max_line_size
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self.max_headers = max_headers
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self.max_field_size = max_field_size
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def parse_headers(
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self,
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lines: List[bytes]
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) -> Tuple['CIMultiDictProxy[str]', RawHeaders]:
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headers = CIMultiDict() # type: CIMultiDict[str]
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raw_headers = []
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lines_idx = 1
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line = lines[1]
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line_count = len(lines)
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while line:
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# Parse initial header name : value pair.
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try:
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bname, bvalue = line.split(b':', 1)
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except ValueError:
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raise InvalidHeader(line) from None
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bname = bname.strip(b' \t')
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bvalue = bvalue.lstrip()
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if HDRRE.search(bname):
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raise InvalidHeader(bname)
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if len(bname) > self.max_field_size:
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raise LineTooLong(
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"request header name {}".format(
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bname.decode("utf8", "xmlcharrefreplace")),
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str(self.max_field_size),
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str(len(bname)))
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header_length = len(bvalue)
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# next line
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lines_idx += 1
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line = lines[lines_idx]
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# consume continuation lines
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continuation = line and line[0] in (32, 9) # (' ', '\t')
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if continuation:
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bvalue_lst = [bvalue]
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while continuation:
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header_length += len(line)
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if header_length > self.max_field_size:
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raise LineTooLong(
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'request header field {}'.format(
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bname.decode("utf8", "xmlcharrefreplace")),
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str(self.max_field_size),
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str(header_length))
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bvalue_lst.append(line)
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# next line
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lines_idx += 1
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if lines_idx < line_count:
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line = lines[lines_idx]
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if line:
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continuation = line[0] in (32, 9) # (' ', '\t')
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else:
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line = b''
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break
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bvalue = b''.join(bvalue_lst)
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else:
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if header_length > self.max_field_size:
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raise LineTooLong(
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'request header field {}'.format(
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bname.decode("utf8", "xmlcharrefreplace")),
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str(self.max_field_size),
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str(header_length))
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bvalue = bvalue.strip()
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name = bname.decode('utf-8', 'surrogateescape')
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value = bvalue.decode('utf-8', 'surrogateescape')
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headers.add(name, value)
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raw_headers.append((bname, bvalue))
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return (CIMultiDictProxy(headers), tuple(raw_headers))
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class HttpParser(abc.ABC):
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def __init__(self, protocol: Optional[BaseProtocol]=None,
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loop: Optional[asyncio.AbstractEventLoop]=None,
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max_line_size: int=8190,
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max_headers: int=32768,
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max_field_size: int=8190,
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timer: Optional[BaseTimerContext]=None,
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code: Optional[int]=None,
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method: Optional[str]=None,
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readall: bool=False,
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payload_exception: Optional[Type[BaseException]]=None,
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response_with_body: bool=True,
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read_until_eof: bool=False,
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auto_decompress: bool=True) -> None:
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self.protocol = protocol
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self.loop = loop
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self.max_line_size = max_line_size
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self.max_headers = max_headers
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self.max_field_size = max_field_size
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self.timer = timer
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self.code = code
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self.method = method
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self.readall = readall
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self.payload_exception = payload_exception
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self.response_with_body = response_with_body
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self.read_until_eof = read_until_eof
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self._lines = [] # type: List[bytes]
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self._tail = b''
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self._upgraded = False
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self._payload = None
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self._payload_parser = None # type: Optional[HttpPayloadParser]
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self._auto_decompress = auto_decompress
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self._headers_parser = HeadersParser(max_line_size,
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max_headers,
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max_field_size)
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@abc.abstractmethod
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def parse_message(self, lines: List[bytes]) -> Any:
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pass
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def feed_eof(self) -> Any:
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if self._payload_parser is not None:
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self._payload_parser.feed_eof()
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self._payload_parser = None
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else:
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# try to extract partial message
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if self._tail:
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self._lines.append(self._tail)
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if self._lines:
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if self._lines[-1] != '\r\n':
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self._lines.append(b'')
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try:
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return self.parse_message(self._lines)
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except Exception:
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return None
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def feed_data(
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self,
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data: bytes,
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SEP: bytes=b'\r\n',
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EMPTY: bytes=b'',
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CONTENT_LENGTH: istr=hdrs.CONTENT_LENGTH,
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METH_CONNECT: str=hdrs.METH_CONNECT,
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SEC_WEBSOCKET_KEY1: istr=hdrs.SEC_WEBSOCKET_KEY1
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) -> Tuple[List[Any], bool, bytes]:
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messages = []
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if self._tail:
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data, self._tail = self._tail + data, b''
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data_len = len(data)
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start_pos = 0
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loop = self.loop
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while start_pos < data_len:
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# read HTTP message (request/response line + headers), \r\n\r\n
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# and split by lines
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if self._payload_parser is None and not self._upgraded:
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pos = data.find(SEP, start_pos)
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# consume \r\n
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if pos == start_pos and not self._lines:
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start_pos = pos + 2
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continue
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if pos >= start_pos:
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# line found
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self._lines.append(data[start_pos:pos])
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start_pos = pos + 2
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# \r\n\r\n found
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if self._lines[-1] == EMPTY:
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try:
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msg = self.parse_message(self._lines)
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finally:
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self._lines.clear()
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# payload length
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length = msg.headers.get(CONTENT_LENGTH)
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if length is not None:
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try:
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length = int(length)
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except ValueError:
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raise InvalidHeader(CONTENT_LENGTH)
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if length < 0:
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raise InvalidHeader(CONTENT_LENGTH)
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# do not support old websocket spec
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if SEC_WEBSOCKET_KEY1 in msg.headers:
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raise InvalidHeader(SEC_WEBSOCKET_KEY1)
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self._upgraded = msg.upgrade
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method = getattr(msg, 'method', self.method)
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assert self.protocol is not None
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# calculate payload
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if ((length is not None and length > 0) or
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msg.chunked and not msg.upgrade):
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payload = StreamReader(
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self.protocol, timer=self.timer, loop=loop)
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payload_parser = HttpPayloadParser(
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payload, length=length,
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chunked=msg.chunked, method=method,
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compression=msg.compression,
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code=self.code, readall=self.readall,
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response_with_body=self.response_with_body,
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auto_decompress=self._auto_decompress)
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if not payload_parser.done:
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self._payload_parser = payload_parser
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elif method == METH_CONNECT:
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payload = StreamReader(
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self.protocol, timer=self.timer, loop=loop)
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self._upgraded = True
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self._payload_parser = HttpPayloadParser(
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payload, method=msg.method,
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compression=msg.compression, readall=True,
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auto_decompress=self._auto_decompress)
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else:
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if (getattr(msg, 'code', 100) >= 199 and
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length is None and self.read_until_eof):
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payload = StreamReader(
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self.protocol, timer=self.timer, loop=loop)
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payload_parser = HttpPayloadParser(
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payload, length=length,
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chunked=msg.chunked, method=method,
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compression=msg.compression,
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code=self.code, readall=True,
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response_with_body=self.response_with_body,
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auto_decompress=self._auto_decompress)
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if not payload_parser.done:
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self._payload_parser = payload_parser
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else:
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payload = EMPTY_PAYLOAD # type: ignore
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messages.append((msg, payload))
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else:
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self._tail = data[start_pos:]
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data = EMPTY
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break
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# no parser, just store
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elif self._payload_parser is None and self._upgraded:
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assert not self._lines
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break
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# feed payload
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elif data and start_pos < data_len:
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assert not self._lines
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assert self._payload_parser is not None
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try:
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eof, data = self._payload_parser.feed_data(
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data[start_pos:])
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except BaseException as exc:
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if self.payload_exception is not None:
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self._payload_parser.payload.set_exception(
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self.payload_exception(str(exc)))
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else:
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self._payload_parser.payload.set_exception(exc)
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eof = True
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data = b''
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if eof:
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start_pos = 0
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data_len = len(data)
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self._payload_parser = None
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continue
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else:
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break
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if data and start_pos < data_len:
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data = data[start_pos:]
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else:
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data = EMPTY
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return messages, self._upgraded, data
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def parse_headers(
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self,
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lines: List[bytes]
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) -> Tuple['CIMultiDictProxy[str]',
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RawHeaders,
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Optional[bool],
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Optional[str],
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bool,
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bool]:
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"""Parses RFC 5322 headers from a stream.
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Line continuations are supported. Returns list of header name
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and value pairs. Header name is in upper case.
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"""
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headers, raw_headers = self._headers_parser.parse_headers(lines)
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close_conn = None
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encoding = None
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upgrade = False
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chunked = False
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# keep-alive
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conn = headers.get(hdrs.CONNECTION)
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if conn:
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v = conn.lower()
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if v == 'close':
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close_conn = True
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elif v == 'keep-alive':
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close_conn = False
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elif v == 'upgrade':
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upgrade = True
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# encoding
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enc = headers.get(hdrs.CONTENT_ENCODING)
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if enc:
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enc = enc.lower()
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if enc in ('gzip', 'deflate', 'br'):
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encoding = enc
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# chunking
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te = headers.get(hdrs.TRANSFER_ENCODING)
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if te and 'chunked' in te.lower():
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chunked = True
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return (headers, raw_headers, close_conn, encoding, upgrade, chunked)
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def set_upgraded(self, val: bool) -> None:
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"""Set connection upgraded (to websocket) mode.
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:param bool val: new state.
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"""
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self._upgraded = val
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class HttpRequestParser(HttpParser):
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"""Read request status line. Exception .http_exceptions.BadStatusLine
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could be raised in case of any errors in status line.
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Returns RawRequestMessage.
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"""
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def parse_message(self, lines: List[bytes]) -> Any:
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# request line
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line = lines[0].decode('utf-8', 'surrogateescape')
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try:
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method, path, version = line.split(None, 2)
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except ValueError:
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raise BadStatusLine(line) from None
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if len(path) > self.max_line_size:
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raise LineTooLong(
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'Status line is too long',
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str(self.max_line_size),
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str(len(path)))
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# method
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if not METHRE.match(method):
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raise BadStatusLine(method)
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# version
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try:
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if version.startswith('HTTP/'):
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n1, n2 = version[5:].split('.', 1)
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version_o = HttpVersion(int(n1), int(n2))
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else:
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raise BadStatusLine(version)
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except Exception:
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raise BadStatusLine(version)
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# read headers
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(headers, raw_headers,
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close, compression, upgrade, chunked) = self.parse_headers(lines)
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if close is None: # then the headers weren't set in the request
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if version_o <= HttpVersion10: # HTTP 1.0 must asks to not close
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close = True
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else: # HTTP 1.1 must ask to close.
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close = False
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return RawRequestMessage(
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method, path, version_o, headers, raw_headers,
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close, compression, upgrade, chunked, URL(path))
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class HttpResponseParser(HttpParser):
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"""Read response status line and headers.
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BadStatusLine could be raised in case of any errors in status line.
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Returns RawResponseMessage"""
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def parse_message(self, lines: List[bytes]) -> Any:
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line = lines[0].decode('utf-8', 'surrogateescape')
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try:
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version, status = line.split(None, 1)
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except ValueError:
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raise BadStatusLine(line) from None
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try:
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status, reason = status.split(None, 1)
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except ValueError:
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reason = ''
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if len(reason) > self.max_line_size:
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raise LineTooLong(
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'Status line is too long',
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str(self.max_line_size),
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str(len(reason)))
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|
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# version
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match = VERSRE.match(version)
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if match is None:
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raise BadStatusLine(line)
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version_o = HttpVersion(int(match.group(1)), int(match.group(2)))
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# The status code is a three-digit number
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try:
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status_i = int(status)
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except ValueError:
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raise BadStatusLine(line) from None
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if status_i > 999:
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raise BadStatusLine(line)
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# read headers
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(headers, raw_headers,
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close, compression, upgrade, chunked) = self.parse_headers(lines)
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if close is None:
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close = version_o <= HttpVersion10
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return RawResponseMessage(
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version_o, status_i, reason.strip(),
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headers, raw_headers, close, compression, upgrade, chunked)
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|
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class HttpPayloadParser:
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def __init__(self, payload: StreamReader,
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length: Optional[int]=None,
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chunked: bool=False,
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compression: Optional[str]=None,
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code: Optional[int]=None,
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method: Optional[str]=None,
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readall: bool=False,
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response_with_body: bool=True,
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auto_decompress: bool=True) -> None:
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self._length = 0
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self._type = ParseState.PARSE_NONE
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self._chunk = ChunkState.PARSE_CHUNKED_SIZE
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self._chunk_size = 0
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self._chunk_tail = b''
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self._auto_decompress = auto_decompress
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self.done = False
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|
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# payload decompression wrapper
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if response_with_body and compression and self._auto_decompress:
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real_payload = DeflateBuffer(payload, compression) # type: Union[StreamReader, DeflateBuffer] # noqa
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else:
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real_payload = payload
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|
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# payload parser
|
|
if not response_with_body:
|
|
# don't parse payload if it's not expected to be received
|
|
self._type = ParseState.PARSE_NONE
|
|
real_payload.feed_eof()
|
|
self.done = True
|
|
|
|
elif chunked:
|
|
self._type = ParseState.PARSE_CHUNKED
|
|
elif length is not None:
|
|
self._type = ParseState.PARSE_LENGTH
|
|
self._length = length
|
|
if self._length == 0:
|
|
real_payload.feed_eof()
|
|
self.done = True
|
|
else:
|
|
if readall and code != 204:
|
|
self._type = ParseState.PARSE_UNTIL_EOF
|
|
elif method in ('PUT', 'POST'):
|
|
internal_logger.warning( # pragma: no cover
|
|
'Content-Length or Transfer-Encoding header is required')
|
|
self._type = ParseState.PARSE_NONE
|
|
real_payload.feed_eof()
|
|
self.done = True
|
|
|
|
self.payload = real_payload
|
|
|
|
def feed_eof(self) -> None:
|
|
if self._type == ParseState.PARSE_UNTIL_EOF:
|
|
self.payload.feed_eof()
|
|
elif self._type == ParseState.PARSE_LENGTH:
|
|
raise ContentLengthError(
|
|
"Not enough data for satisfy content length header.")
|
|
elif self._type == ParseState.PARSE_CHUNKED:
|
|
raise TransferEncodingError(
|
|
"Not enough data for satisfy transfer length header.")
|
|
|
|
def feed_data(self,
|
|
chunk: bytes,
|
|
SEP: bytes=b'\r\n',
|
|
CHUNK_EXT: bytes=b';') -> Tuple[bool, bytes]:
|
|
# Read specified amount of bytes
|
|
if self._type == ParseState.PARSE_LENGTH:
|
|
required = self._length
|
|
chunk_len = len(chunk)
|
|
|
|
if required >= chunk_len:
|
|
self._length = required - chunk_len
|
|
self.payload.feed_data(chunk, chunk_len)
|
|
if self._length == 0:
|
|
self.payload.feed_eof()
|
|
return True, b''
|
|
else:
|
|
self._length = 0
|
|
self.payload.feed_data(chunk[:required], required)
|
|
self.payload.feed_eof()
|
|
return True, chunk[required:]
|
|
|
|
# Chunked transfer encoding parser
|
|
elif self._type == ParseState.PARSE_CHUNKED:
|
|
if self._chunk_tail:
|
|
chunk = self._chunk_tail + chunk
|
|
self._chunk_tail = b''
|
|
|
|
while chunk:
|
|
|
|
# read next chunk size
|
|
if self._chunk == ChunkState.PARSE_CHUNKED_SIZE:
|
|
pos = chunk.find(SEP)
|
|
if pos >= 0:
|
|
i = chunk.find(CHUNK_EXT, 0, pos)
|
|
if i >= 0:
|
|
size_b = chunk[:i] # strip chunk-extensions
|
|
else:
|
|
size_b = chunk[:pos]
|
|
|
|
try:
|
|
size = int(bytes(size_b), 16)
|
|
except ValueError:
|
|
exc = TransferEncodingError(
|
|
chunk[:pos].decode('ascii', 'surrogateescape'))
|
|
self.payload.set_exception(exc)
|
|
raise exc from None
|
|
|
|
chunk = chunk[pos+2:]
|
|
if size == 0: # eof marker
|
|
self._chunk = ChunkState.PARSE_MAYBE_TRAILERS
|
|
else:
|
|
self._chunk = ChunkState.PARSE_CHUNKED_CHUNK
|
|
self._chunk_size = size
|
|
self.payload.begin_http_chunk_receiving()
|
|
else:
|
|
self._chunk_tail = chunk
|
|
return False, b''
|
|
|
|
# read chunk and feed buffer
|
|
if self._chunk == ChunkState.PARSE_CHUNKED_CHUNK:
|
|
required = self._chunk_size
|
|
chunk_len = len(chunk)
|
|
|
|
if required > chunk_len:
|
|
self._chunk_size = required - chunk_len
|
|
self.payload.feed_data(chunk, chunk_len)
|
|
return False, b''
|
|
else:
|
|
self._chunk_size = 0
|
|
self.payload.feed_data(chunk[:required], required)
|
|
chunk = chunk[required:]
|
|
self._chunk = ChunkState.PARSE_CHUNKED_CHUNK_EOF
|
|
self.payload.end_http_chunk_receiving()
|
|
|
|
# toss the CRLF at the end of the chunk
|
|
if self._chunk == ChunkState.PARSE_CHUNKED_CHUNK_EOF:
|
|
if chunk[:2] == SEP:
|
|
chunk = chunk[2:]
|
|
self._chunk = ChunkState.PARSE_CHUNKED_SIZE
|
|
else:
|
|
self._chunk_tail = chunk
|
|
return False, b''
|
|
|
|
# if stream does not contain trailer, after 0\r\n
|
|
# we should get another \r\n otherwise
|
|
# trailers needs to be skiped until \r\n\r\n
|
|
if self._chunk == ChunkState.PARSE_MAYBE_TRAILERS:
|
|
if chunk[:2] == SEP:
|
|
# end of stream
|
|
self.payload.feed_eof()
|
|
return True, chunk[2:]
|
|
else:
|
|
self._chunk = ChunkState.PARSE_TRAILERS
|
|
|
|
# read and discard trailer up to the CRLF terminator
|
|
if self._chunk == ChunkState.PARSE_TRAILERS:
|
|
pos = chunk.find(SEP)
|
|
if pos >= 0:
|
|
chunk = chunk[pos+2:]
|
|
self._chunk = ChunkState.PARSE_MAYBE_TRAILERS
|
|
else:
|
|
self._chunk_tail = chunk
|
|
return False, b''
|
|
|
|
# Read all bytes until eof
|
|
elif self._type == ParseState.PARSE_UNTIL_EOF:
|
|
self.payload.feed_data(chunk, len(chunk))
|
|
|
|
return False, b''
|
|
|
|
|
|
class DeflateBuffer:
|
|
"""DeflateStream decompress stream and feed data into specified stream."""
|
|
|
|
def __init__(self, out: StreamReader, encoding: Optional[str]) -> None:
|
|
self.out = out
|
|
self.size = 0
|
|
self.encoding = encoding
|
|
self._started_decoding = False
|
|
|
|
if encoding == 'br':
|
|
if not HAS_BROTLI: # pragma: no cover
|
|
raise ContentEncodingError(
|
|
'Can not decode content-encoding: brotli (br). '
|
|
'Please install `brotlipy`')
|
|
self.decompressor = brotli.Decompressor()
|
|
else:
|
|
zlib_mode = (16 + zlib.MAX_WBITS
|
|
if encoding == 'gzip' else zlib.MAX_WBITS)
|
|
self.decompressor = zlib.decompressobj(wbits=zlib_mode)
|
|
|
|
def set_exception(self, exc: BaseException) -> None:
|
|
self.out.set_exception(exc)
|
|
|
|
def feed_data(self, chunk: bytes, size: int) -> None:
|
|
if not size:
|
|
return
|
|
|
|
self.size += size
|
|
|
|
# RFC1950
|
|
# bits 0..3 = CM = 0b1000 = 8 = "deflate"
|
|
# bits 4..7 = CINFO = 1..7 = windows size.
|
|
if not self._started_decoding and self.encoding == 'deflate' \
|
|
and chunk[0] & 0xf != 8:
|
|
# Change the decoder to decompress incorrectly compressed data
|
|
# Actually we should issue a warning about non-RFC-compilant data.
|
|
self.decompressor = zlib.decompressobj(wbits=-zlib.MAX_WBITS)
|
|
|
|
try:
|
|
chunk = self.decompressor.decompress(chunk)
|
|
except Exception:
|
|
raise ContentEncodingError(
|
|
'Can not decode content-encoding: %s' % self.encoding)
|
|
|
|
self._started_decoding = True
|
|
|
|
if chunk:
|
|
self.out.feed_data(chunk, len(chunk))
|
|
|
|
def feed_eof(self) -> None:
|
|
chunk = self.decompressor.flush()
|
|
|
|
if chunk or self.size > 0:
|
|
self.out.feed_data(chunk, len(chunk))
|
|
if self.encoding == 'deflate' and not self.decompressor.eof:
|
|
raise ContentEncodingError('deflate')
|
|
|
|
self.out.feed_eof()
|
|
|
|
def begin_http_chunk_receiving(self) -> None:
|
|
self.out.begin_http_chunk_receiving()
|
|
|
|
def end_http_chunk_receiving(self) -> None:
|
|
self.out.end_http_chunk_receiving()
|
|
|
|
|
|
HttpRequestParserPy = HttpRequestParser
|
|
HttpResponseParserPy = HttpResponseParser
|
|
RawRequestMessagePy = RawRequestMessage
|
|
RawResponseMessagePy = RawResponseMessage
|
|
|
|
try:
|
|
if not NO_EXTENSIONS:
|
|
from ._http_parser import (HttpRequestParser, # type: ignore # noqa
|
|
HttpResponseParser,
|
|
RawRequestMessage,
|
|
RawResponseMessage)
|
|
HttpRequestParserC = HttpRequestParser
|
|
HttpResponseParserC = HttpResponseParser
|
|
RawRequestMessageC = RawRequestMessage
|
|
RawResponseMessageC = RawResponseMessage
|
|
except ImportError: # pragma: no cover
|
|
pass
|