File size: 12,446 Bytes
9c6594c |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 |
"""Http related parsers and protocol."""
import asyncio
import sys
from typing import ( # noqa
TYPE_CHECKING,
Any,
Awaitable,
Callable,
Iterable,
List,
NamedTuple,
Optional,
Union,
)
from multidict import CIMultiDict
from .abc import AbstractStreamWriter
from .base_protocol import BaseProtocol
from .client_exceptions import ClientConnectionResetError
from .compression_utils import ZLibCompressor
from .helpers import NO_EXTENSIONS
__all__ = ("StreamWriter", "HttpVersion", "HttpVersion10", "HttpVersion11")
MIN_PAYLOAD_FOR_WRITELINES = 2048
IS_PY313_BEFORE_313_2 = (3, 13, 0) <= sys.version_info < (3, 13, 2)
IS_PY_BEFORE_312_9 = sys.version_info < (3, 12, 9)
SKIP_WRITELINES = IS_PY313_BEFORE_313_2 or IS_PY_BEFORE_312_9
# writelines is not safe for use
# on Python 3.12+ until 3.12.9
# on Python 3.13+ until 3.13.2
# and on older versions it not any faster than write
# CVE-2024-12254: https://github.com/python/cpython/pull/127656
class HttpVersion(NamedTuple):
major: int
minor: int
HttpVersion10 = HttpVersion(1, 0)
HttpVersion11 = HttpVersion(1, 1)
_T_OnChunkSent = Optional[Callable[[bytes], Awaitable[None]]]
_T_OnHeadersSent = Optional[Callable[["CIMultiDict[str]"], Awaitable[None]]]
class StreamWriter(AbstractStreamWriter):
length: Optional[int] = None
chunked: bool = False
_eof: bool = False
_compress: Optional[ZLibCompressor] = None
def __init__(
self,
protocol: BaseProtocol,
loop: asyncio.AbstractEventLoop,
on_chunk_sent: _T_OnChunkSent = None,
on_headers_sent: _T_OnHeadersSent = None,
) -> None:
self._protocol = protocol
self.loop = loop
self._on_chunk_sent: _T_OnChunkSent = on_chunk_sent
self._on_headers_sent: _T_OnHeadersSent = on_headers_sent
self._headers_buf: Optional[bytes] = None
self._headers_written: bool = False
@property
def transport(self) -> Optional[asyncio.Transport]:
return self._protocol.transport
@property
def protocol(self) -> BaseProtocol:
return self._protocol
def enable_chunking(self) -> None:
self.chunked = True
def enable_compression(
self, encoding: str = "deflate", strategy: Optional[int] = None
) -> None:
self._compress = ZLibCompressor(encoding=encoding, strategy=strategy)
def _write(self, chunk: Union[bytes, bytearray, memoryview]) -> None:
size = len(chunk)
self.buffer_size += size
self.output_size += size
transport = self._protocol.transport
if transport is None or transport.is_closing():
raise ClientConnectionResetError("Cannot write to closing transport")
transport.write(chunk)
def _writelines(self, chunks: Iterable[bytes]) -> None:
size = 0
for chunk in chunks:
size += len(chunk)
self.buffer_size += size
self.output_size += size
transport = self._protocol.transport
if transport is None or transport.is_closing():
raise ClientConnectionResetError("Cannot write to closing transport")
if SKIP_WRITELINES or size < MIN_PAYLOAD_FOR_WRITELINES:
transport.write(b"".join(chunks))
else:
transport.writelines(chunks)
def _write_chunked_payload(
self, chunk: Union[bytes, bytearray, "memoryview[int]", "memoryview[bytes]"]
) -> None:
"""Write a chunk with proper chunked encoding."""
chunk_len_pre = f"{len(chunk):x}\r\n".encode("ascii")
self._writelines((chunk_len_pre, chunk, b"\r\n"))
def _send_headers_with_payload(
self,
chunk: Union[bytes, bytearray, "memoryview[int]", "memoryview[bytes]"],
is_eof: bool,
) -> None:
"""Send buffered headers with payload, coalescing into single write."""
# Mark headers as written
self._headers_written = True
headers_buf = self._headers_buf
self._headers_buf = None
if TYPE_CHECKING:
# Safe because callers (write() and write_eof()) only invoke this method
# after checking that self._headers_buf is truthy
assert headers_buf is not None
if not self.chunked:
# Non-chunked: coalesce headers with body
if chunk:
self._writelines((headers_buf, chunk))
else:
self._write(headers_buf)
return
# Coalesce headers with chunked data
if chunk:
chunk_len_pre = f"{len(chunk):x}\r\n".encode("ascii")
if is_eof:
self._writelines((headers_buf, chunk_len_pre, chunk, b"\r\n0\r\n\r\n"))
else:
self._writelines((headers_buf, chunk_len_pre, chunk, b"\r\n"))
elif is_eof:
self._writelines((headers_buf, b"0\r\n\r\n"))
else:
self._write(headers_buf)
async def write(
self,
chunk: Union[bytes, bytearray, memoryview],
*,
drain: bool = True,
LIMIT: int = 0x10000,
) -> None:
"""
Writes chunk of data to a stream.
write_eof() indicates end of stream.
writer can't be used after write_eof() method being called.
write() return drain future.
"""
if self._on_chunk_sent is not None:
await self._on_chunk_sent(chunk)
if isinstance(chunk, memoryview):
if chunk.nbytes != len(chunk):
# just reshape it
chunk = chunk.cast("c")
if self._compress is not None:
chunk = await self._compress.compress(chunk)
if not chunk:
return
if self.length is not None:
chunk_len = len(chunk)
if self.length >= chunk_len:
self.length = self.length - chunk_len
else:
chunk = chunk[: self.length]
self.length = 0
if not chunk:
return
# Handle buffered headers for small payload optimization
if self._headers_buf and not self._headers_written:
self._send_headers_with_payload(chunk, False)
if drain and self.buffer_size > LIMIT:
self.buffer_size = 0
await self.drain()
return
if chunk:
if self.chunked:
self._write_chunked_payload(chunk)
else:
self._write(chunk)
if drain and self.buffer_size > LIMIT:
self.buffer_size = 0
await self.drain()
async def write_headers(
self, status_line: str, headers: "CIMultiDict[str]"
) -> None:
"""Write headers to the stream."""
if self._on_headers_sent is not None:
await self._on_headers_sent(headers)
# status + headers
buf = _serialize_headers(status_line, headers)
self._headers_written = False
self._headers_buf = buf
def send_headers(self) -> None:
"""Force sending buffered headers if not already sent."""
if not self._headers_buf or self._headers_written:
return
self._headers_written = True
headers_buf = self._headers_buf
self._headers_buf = None
if TYPE_CHECKING:
# Safe because we only enter this block when self._headers_buf is truthy
assert headers_buf is not None
self._write(headers_buf)
def set_eof(self) -> None:
"""Indicate that the message is complete."""
if self._eof:
return
# If headers haven't been sent yet, send them now
# This handles the case where there's no body at all
if self._headers_buf and not self._headers_written:
self._headers_written = True
headers_buf = self._headers_buf
self._headers_buf = None
if TYPE_CHECKING:
# Safe because we only enter this block when self._headers_buf is truthy
assert headers_buf is not None
# Combine headers and chunked EOF marker in a single write
if self.chunked:
self._writelines((headers_buf, b"0\r\n\r\n"))
else:
self._write(headers_buf)
elif self.chunked and self._headers_written:
# Headers already sent, just send the final chunk marker
self._write(b"0\r\n\r\n")
self._eof = True
async def write_eof(self, chunk: bytes = b"") -> None:
if self._eof:
return
if chunk and self._on_chunk_sent is not None:
await self._on_chunk_sent(chunk)
# Handle body/compression
if self._compress:
chunks: List[bytes] = []
chunks_len = 0
if chunk and (compressed_chunk := await self._compress.compress(chunk)):
chunks_len = len(compressed_chunk)
chunks.append(compressed_chunk)
flush_chunk = self._compress.flush()
chunks_len += len(flush_chunk)
chunks.append(flush_chunk)
assert chunks_len
# Send buffered headers with compressed data if not yet sent
if self._headers_buf and not self._headers_written:
self._headers_written = True
headers_buf = self._headers_buf
self._headers_buf = None
if self.chunked:
# Coalesce headers with compressed chunked data
chunk_len_pre = f"{chunks_len:x}\r\n".encode("ascii")
self._writelines(
(headers_buf, chunk_len_pre, *chunks, b"\r\n0\r\n\r\n")
)
else:
# Coalesce headers with compressed data
self._writelines((headers_buf, *chunks))
await self.drain()
self._eof = True
return
# Headers already sent, just write compressed data
if self.chunked:
chunk_len_pre = f"{chunks_len:x}\r\n".encode("ascii")
self._writelines((chunk_len_pre, *chunks, b"\r\n0\r\n\r\n"))
elif len(chunks) > 1:
self._writelines(chunks)
else:
self._write(chunks[0])
await self.drain()
self._eof = True
return
# No compression - send buffered headers if not yet sent
if self._headers_buf and not self._headers_written:
# Use helper to send headers with payload
self._send_headers_with_payload(chunk, True)
await self.drain()
self._eof = True
return
# Handle remaining body
if self.chunked:
if chunk:
# Write final chunk with EOF marker
self._writelines(
(f"{len(chunk):x}\r\n".encode("ascii"), chunk, b"\r\n0\r\n\r\n")
)
else:
self._write(b"0\r\n\r\n")
await self.drain()
self._eof = True
return
if chunk:
self._write(chunk)
await self.drain()
self._eof = True
async def drain(self) -> None:
"""Flush the write buffer.
The intended use is to write
await w.write(data)
await w.drain()
"""
protocol = self._protocol
if protocol.transport is not None and protocol._paused:
await protocol._drain_helper()
def _safe_header(string: str) -> str:
if "\r" in string or "\n" in string:
raise ValueError(
"Newline or carriage return detected in headers. "
"Potential header injection attack."
)
return string
def _py_serialize_headers(status_line: str, headers: "CIMultiDict[str]") -> bytes:
headers_gen = (_safe_header(k) + ": " + _safe_header(v) for k, v in headers.items())
line = status_line + "\r\n" + "\r\n".join(headers_gen) + "\r\n\r\n"
return line.encode("utf-8")
_serialize_headers = _py_serialize_headers
try:
import aiohttp._http_writer as _http_writer # type: ignore[import-not-found]
_c_serialize_headers = _http_writer._serialize_headers
if not NO_EXTENSIONS:
_serialize_headers = _c_serialize_headers
except ImportError:
pass
|