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web_response.py
import asyncio import collections.abc import datetime import enum import json import math import time import warnings from concurrent.futures import Executor from http import HTTPStatus from http.cookies import SimpleCookie from typing import ( TYPE_CHECKING, Any, Dict, Iterator, MutableMapping, Optional, Union, cast, ) from multidict import CIMultiDict, istr from . import hdrs, payload from .abc import AbstractStreamWriter from .compression_utils import ZLibCompressor from .helpers import ( ETAG_ANY, QUOTED_ETAG_RE, ETag, HeadersMixin, must_be_empty_body, parse_http_date, rfc822_formatted_time, sentinel, should_remove_content_length, validate_etag_value, ) from .http import SERVER_SOFTWARE, HttpVersion10, HttpVersion11 from .payload import Payload from .typedefs import JSONEncoder, LooseHeaders __all__ = ("ContentCoding", "StreamResponse", "Response", "json_response") if TYPE_CHECKING: from .web_request import BaseRequest BaseClass = MutableMapping[str, Any] else: BaseClass = collections.abc.MutableMapping class ContentCoding(enum.Enum): # The content codings that we have support for. # # Additional registered codings are listed at: # https://www.iana.org/assignments/http-parameters/http-parameters.xhtml#content-coding deflate = "deflate" gzip = "gzip" identity = "identity" ############################################################ # HTTP Response classes ############################################################ class StreamResponse(BaseClass, HeadersMixin): _length_check = True def __init__( self, *, status: int = 200, reason: Optional[str] = None, headers: Optional[LooseHeaders] = None, ) -> None: self._body = None self._keep_alive: Optional[bool] = None self._chunked = False self._compression = False self._compression_force: Optional[ContentCoding] = None self._cookies = SimpleCookie() self._req: Optional[BaseRequest] = None self._payload_writer: Optional[AbstractStreamWriter] = None self._eof_sent = False self._must_be_empty_body: Optional[bool] = None self._body_length = 0 self._state: Dict[str, Any] = {} if headers is not None: self._headers: CIMultiDict[str] = CIMultiDict(headers) else: self._headers = CIMultiDict() self.set_status(status, reason) @property def prepared(self) -> bool: return self._payload_writer is not None @property def task(self) -> "Optional[asyncio.Task[None]]": if self._req: return self._req.task else: return None @property def status(self) -> int: return self._status @property def chunked(self) -> bool: return self._chunked @property def compression(self) -> bool: return self._compression @property def reason(self) -> str: return self._reason def set_status( self, status: int, reason: Optional[str] = None, ) -> None: assert not self.prepared, ( "Cannot change the response status code after " "the headers have been sent" ) self._status = int(status) if reason is None: try: reason = HTTPStatus(self._status).phrase except ValueError: reason = "" self._reason = reason @property def keep_alive(self) -> Optional[bool]: return self._keep_alive def force_close(self) -> None: self._keep_alive = False @property def body_length(self) -> int: return self._body_length @property def output_length(self) -> int: warnings.warn("output_length is deprecated", DeprecationWarning) assert self._payload_writer return self._payload_writer.buffer_size def enable_chunked_encoding(self, chunk_size: Optional[int] = None) -> None: """Enables automatic chunked transfer encoding.""" self._chunked = True if hdrs.CONTENT_LENGTH in self._headers: raise RuntimeError( "You can't enable chunked encoding when " "a content length is set" ) if chunk_size is not None: warnings.warn("Chunk size is deprecated #1615", DeprecationWarning) def enable_compression( self, force: Optional[Union[bool, ContentCoding]] = None ) -> None: """Enables response compression encoding.""" # Backwards compatibility for when force was a bool <0.17. if type(force) == bool: force = ContentCoding.deflate if force else ContentCoding.identity warnings.warn( "Using boolean for force is deprecated #3318", DeprecationWarning ) elif force is not None: assert isinstance(force, ContentCoding), ( "force should one of " "None, bool or " "ContentEncoding" ) self._compression = True self._compression_force = force @property def headers(self) -> "CIMultiDict[str]": return self._headers @property def cookies(self) -> SimpleCookie: return self._cookies def set_cookie( self, name: str, value: str, *, expires: Optional[str] = None, domain: Optional[str] = None, max_age: Optional[Union[int, str]] = None, path: str = "/", secure: Optional[bool] = None, httponly: Optional[bool] = None, version: Optional[str] = None, samesite: Optional[str] = None, ) -> None: """Set or update response cookie. Sets new cookie or updates existent with new value. Also updates only those params which are not None. """ old = self._cookies.get(name) if old is not None and old.coded_value == "": # deleted cookie self._cookies.pop(name, None) self._cookies[name] = value c = self._cookies[name] if expires is not None: c["expires"] = expires elif c.get("expires") == "Thu, 01 Jan 1970 00:00:00 GMT": del c["expires"] if domain is not None: c["domain"] = domain if max_age is not None: c["max-age"] = str(max_age) elif "max-age" in c: del c["max-age"] c["path"] = path if secure is not None: c["secure"] = secure if httponly is not None: c["httponly"] = httponly if version is not None: c["version"] = version if samesite is not None: c["samesite"] = samesite def del_cookie( self, name: str, *, domain: Optional[str] = None, path: str = "/" ) -> None: """Delete cookie. Creates new empty expired cookie. """ # TODO: do we need domain/path here? self._cookies.pop(name, None) self.set_cookie( name, "", max_age=0, expires="Thu, 01 Jan 1970 00:00:00 GMT", domain=domain, path=path, ) @property def content_length(self) -> Optional[int]: # Just a placeholder for adding setter return super().content_length @content_length.setter def content_length(self, value: Optional[int]) -> None: if value is not None: value = int(value) if self._chunked: raise RuntimeError( "You can't set content length when " "chunked encoding is enable" ) self._headers[hdrs.CONTENT_LENGTH] = str(value) else: self._headers.pop(hdrs.CONTENT_LENGTH, None) @property def content_type(self) -> str: # Just a placeholder for adding setter return super().content_type @content_type.setter def content_type(self, value: str) -> None: self.content_type # read header values if needed self._content_type = str(value) self._generate_content_type_header() @property def charset(self) -> Optional[str]: # Just a placeholder for adding setter return super().charset @charset.setter def charset(self, value: Optional[str]) -> None: ctype = self.content_type # read header values if needed if ctype == "application/octet-stream": raise RuntimeError( "Setting charset for application/octet-stream " "doesn't make sense, setup content_type first" ) assert self._content_dict is not None if value is None: self._content_dict.pop("charset", None) else: self._content_dict["charset"] = str(value).lower() self._generate_content_type_header() @property def last_modified(self) -> Optional[datetime.datetime]: """The value of Last-Modified HTTP header, or None. This header is represented as a `datetime` object. """ return parse_http_date(self._headers.get(hdrs.LAST_MODIFIED)) @last_modified.setter def last_modified( self, value: Optional[Union[int, float, datetime.datetime, str]] ) -> None: if value is None: self._headers.pop(hdrs.LAST_MODIFIED, None) elif isinstance(value, (int, float)): self._headers[hdrs.LAST_MODIFIED] = time.strftime( "%a, %d %b %Y %H:%M:%S GMT", time.gmtime(math.ceil(value)) ) elif isinstance(value, datetime.datetime): self._headers[hdrs.LAST_MODIFIED] = time.strftime( "%a, %d %b %Y %H:%M:%S GMT", value.utctimetuple() ) elif isinstance(value, str): self._headers[hdrs.LAST_MODIFIED] = value @property def etag(self) -> Optional[ETag]: quoted_value = self._headers.get(hdrs.ETAG) if not quoted_value: return None elif quoted_value == ETAG_ANY: return ETag(value=ETAG_ANY) match = QUOTED_ETAG_RE.fullmatch(quoted_value) if not match: return None is_weak, value = match.group(1, 2) return ETag( is_weak=bool(is_weak), value=value, ) @etag.setter def etag(self, value: Optional[Union[ETag, str]]) -> None: if value is None: self._headers.pop(hdrs.ETAG, None) elif (isinstance(value, str) and value == ETAG_ANY) or ( isinstance(value, ETag) and value.value == ETAG_ANY ): self._headers[hdrs.ETAG] = ETAG_ANY elif isinstance(value, str): validate_etag_value(value) self._headers[hdrs.ETAG] = f'"{value}"' elif isinstance(value, ETag) and isinstance(value.value, str): validate_etag_value(value.value) hdr_value = f'W/"{value.value}"' if value.is_weak else f'"{value.value}"' self._headers[hdrs.ETAG] = hdr_value else: raise ValueError( f"Unsupported etag type: {type(value)}. " f"etag must be str, ETag or None" ) def _generate_content_type_header( self, CONTENT_TYPE: istr = hdrs.CONTENT_TYPE ) -> None: assert self._content_dict is not None assert self._content_type is not None params = "; ".join(f"{k}={v}" for k, v in self._content_dict.items()) if params: ctype = self._content_type + "; " + params else: ctype = self._content_type self._headers[CONTENT_TYPE] = ctype async def _do_start_compression(self, coding: ContentCoding) -> None: if coding != ContentCoding.identity: assert self._payload_writer is not None self._headers[hdrs.CONTENT_ENCODING] = coding.value self._payload_writer.enable_compression(coding.value) # Compressed payload may have different content length, # remove the header self._headers.popall(hdrs.CONTENT_LENGTH, None) async def _start_compression(self, request: "BaseRequest") -> None: if self._compression_force: await self._do_start_compression(self._compression_force) else: accept_encoding = request.headers.get(hdrs.ACCEPT_ENCODING, "").lower() for coding in ContentCoding: if coding.value in accept_encoding: await self._do_start_compression(coding) return async def prepare(self, request: "BaseRequest") -> Optional[AbstractStreamWriter]: if self._eof_sent: return None if self._payload_writer is not None: return self._payload_writer self._must_be_empty_body = must_be_empty_body(request.method, self.status) return await self._start(request) async def _start(self, request: "BaseRequest") -> AbstractStreamWriter: self._req = request writer = self._payload_writer = request._payload_writer await self._prepare_headers() await request._prepare_hook(self) await self._write_headers() return writer async def _prepare_headers(self) -> None: request = self._req assert request is not None writer = self._payload_writer assert writer is not None keep_alive = self._keep_alive if keep_alive is None: keep_alive = request.keep_alive self._keep_alive = keep_alive version = request.version headers = self._headers for cookie in self._cookies.values(): value = cookie.output(header="")[1:] headers.add(hdrs.SET_COOKIE, value) if self._compression: await self._start_compression(request) if self._chunked: if version != HttpVersion11: raise RuntimeError( "Using chunked encoding is forbidden " "for HTTP/{0.major}.{0.minor}".format(request.version) ) if not self._must_be_empty_body: writer.enable_chunking() headers[hdrs.TRANSFER_ENCODING] = "chunked" if hdrs.CONTENT_LENGTH in headers: del headers[hdrs.CONTENT_LENGTH] elif self._length_check: writer.length = self.content_length if writer.length is None: if version >= HttpVersion11: if not self._must_be_empty_body: writer.enable_chunking() headers[hdrs.TRANSFER_ENCODING] = "chunked" elif not self._must_be_empty_body: keep_alive = False # HTTP 1.1: https://tools.ietf.org/html/rfc7230#section-3.3.2 # HTTP 1.0: https://tools.ietf.org/html/rfc1945#section-10.4 if self._must_be_empty_body: if hdrs.CONTENT_LENGTH in headers and should_remove_content_length( request.method, self.status ): del headers[hdrs.CONTENT_LENGTH] # https://datatracker.ietf.org/doc/html/rfc9112#section-6.1-10 # https://datatracker.ietf.org/doc/html/rfc9112#section-6.1-13 if hdrs.TRANSFER_ENCODING in headers: del headers[hdrs.TRANSFER_ENCODING] else: headers.setdefault(hdrs.CONTENT_TYPE, "application/octet-stream") headers.setdefault(hdrs.DATE, rfc822_formatted_time()) headers.setdefault(hdrs.SERVER, SERVER_SOFTWARE) # connection header if hdrs.CONNECTION not in headers: if keep_alive: if version == HttpVersion10: headers[hdrs.CONNECTION] = "keep-alive" else: if version == HttpVersion11: headers[hdrs.CONNECTION] = "close" async def _write_headers(self) -> None: request = self._req assert request is not None writer = self._payload_writer assert writer is not None # status line version = request.version status_line = "HTTP/{}.{} {} {}".format( version[0], version[1], self._status, self._reason ) await writer.write_headers(status_line, self._headers) async def write(self, data: bytes) -> None: assert isinstance( data, (bytes, bytearray, memoryview) ), "data argument must be byte-ish (%r)" % type(data) if self._eof_sent: raise RuntimeError("Cannot call write() after write_eof()") if self._payload_writer is None: raise RuntimeError("Cannot call write() before prepare()") await self._payload_writer.write(data) async def drain(self) -> None: assert not self._eof_sent, "EOF has already been sent" assert self._payload_writer is not None, "Response has not been started" warnings.warn( "drain method is deprecated, use await resp.write()", DeprecationWarning, stacklevel=2, ) await self._payload_writer.drain() async def write_eof(self, data: bytes = b"") -> None: assert isinstance( data, (bytes, bytearray, memoryview) ), "data argument must be byte-ish (%r)" % type(data) if self._eof_sent: return assert self._payload_writer is not None, "Response has not been started" await self._payload_writer.write_eof(data) self._eof_sent = True self._req = None self._body_length = self._payload_writer.output_size self._payload_writer = None def __repr__(self) -> str: if self._eof_sent: info = "eof" elif self.prepared: assert self._req is not None info = f"{self._req.method} {self._req.path} " else: info = "not prepared" return f"<{self.__class__.__name__} {self.reason} {info}>" def __getitem__(self, key: str) -> Any: return self._state[key] def __setitem__(self, key: str, value: Any) -> None: self._state[key] = value def __delitem__(self, key: str) -> None: del self._state[key] def __len__(self) -> int: return len(self._state) def __iter__(self) -> Iterator[str]: return iter(self._state) def __hash__(self) -> int: return hash(id(self)) def __eq__(self, other: object) -> bool: return self is other class Response(StreamResponse): def __init__( self, *, body: Any = None, status: int = 200, reason: Optional[str] = None, text: Optional[str] = None, headers: Optional[LooseHeaders] = None, content_type: Optional[str] = None, charset: Optional[str] = None, zlib_executor_size: Optional[int] = None, zlib_executor: Optional[Executor] = None, ) -> None: if body is not None and text is not None: raise ValueError("body and text are not allowed together") if headers is None: real_headers: CIMultiDict[str] = CIMultiDict() elif not isinstance(headers, CIMultiDict): real_headers = CIMultiDict(headers) else: real_headers = headers # = cast('CIMultiDict[str]', headers) if content_type is not None and "charset" in content_type: raise ValueError("charset must not be in content_type " "argument") if text is not None: if hdrs.CONTENT_TYPE in real_headers: if content_type or charset: raise ValueError( "passing both Content-Type header and " "content_type or charset params " "is forbidden" ) else: # fast path for filling headers if not isinstance(text, str): raise TypeError("text argument must be str (%r)" % type(text)) if content_type is None: content_type = "text/plain" if charset is None: charset = "utf-8" real_headers[hdrs.CONTENT_TYPE] = content_type + "; charset=" + charset body = text.encode(charset) text = None else: if hdrs.CONTENT_TYPE in real_headers: if content_type is not None or charset is not None: raise ValueError( "passing both Content-Type header and " "content_type or charset params " "is forbidden" ) else: if content_type is not None: if charset is not None: content_type += "; charset=" + charset real_headers[hdrs.CONTENT_TYPE] = content_type super().__init__(status=status, reason=reason, headers=real_headers) if text is not None: self.text = text else: self.body = body self._compressed_body: Optional[bytes] = None self._zlib_executor_size = zlib_executor_size self._zlib_executor = zlib_executor @property def body(self) -> Optional[Union[bytes, Payload]]: return self._body @body.setter def body(self, body: bytes) -> None: if body is None: self._body: Optional[bytes] = None self._body_payload: bool = False elif isinstance(body, (bytes, bytearray)): self._body = body self._body_payload = False else: try: self._body = body = payload.PAYLOAD_REGISTRY.get(body) except payload.LookupError: raise ValueError("Unsupported body type %r" % type(body)) self._body_payload = True headers = self._headers # set content-type if hdrs.CONTENT_TYPE not in headers: headers[hdrs.CONTENT_TYPE] = body.content_type # copy payload headers if body.headers: for (key, value) in body.headers.items(): if key not in headers: headers[key] = value self._compressed_body = None @property def text(self) -> Optional[str]: if self._body is None: return None return self._body.decode(self.charset or "utf-8") @text.setter def text(self, text: str) -> None: assert text is None or isinstance( text, str ), "text argument must be str (%r)" % type(text) if self.content_type == "application/octet-stream": self.content_type = "text/plain" if self.charset is None: self.charset = "utf-8" self._body = text.encode(self.charset) self._body_payload = False self._compressed_body = None @property def content_length(self) -> Optional[int]: if self._chunked: return None if hdrs.CONTENT_LENGTH in self._headers: return super().content_length if self._compressed_body is not None: # Return length of the compressed body return len(self._compressed_body) elif self._body_payload: # A payload without content length, or a compressed payload return None elif self._body is not None: return len(self._body) else: return 0 @content_length.setter def content_length(self, value: Optional[int]) -> None: raise RuntimeError("Content length is set automatically") async def write_eof(self, data: bytes = b"") -> None: if self._eof_sent: return if self._compressed_body is None: body: Optional[Union[bytes, Payload]] = self._body else: body = self._compressed_body assert not data, f"data arg is not supported, got {data!r}" assert self._req is not None assert self._payload_writer is not None if body is not None: if self._must_be_empty_body: await super().write_eof() elif self._body_payload: payload = cast(Payload, body) await payload.write(self._payload_writer) await super().write_eof() else: await super().write_eof(cast(bytes, body)) else: await super().write_eof() async def _start(self, request: "BaseRequest") -> AbstractStreamWriter: if should_remove_content_length(request.method, self.status): if hdrs.CONTENT_LENGTH in self._headers: del self._headers[hdrs.CONTENT_LENGTH] elif not self._chunked and hdrs.CONTENT_LENGTH not in self._headers: if self._body_payload: size = cast(Payload, self._body).size if size is not None: self._headers[hdrs.CONTENT_LENGTH] = str(size) else: body_len = len(self._body) if self._body else "0" # https://www.rfc-editor.org/rfc/rfc9110.html#section-8.6-7 if body_len != "0" or ( self.status != 304 and request.method.upper() != hdrs.METH_HEAD ): self._headers[hdrs.CONTENT_LENGTH] = str(body_len) return await super()._start(request) async def _do_start_compression(self, coding: ContentCoding) -> None: if self._body_payload or self._chunked: return await super()._do_start_compression(coding) if coding != ContentCoding.identity: # Instead of using _payload_writer.enable_compression, # compress the whole body compressor = ZLibCompressor( encoding=str(coding.value), max_sync_chunk_size=self._zlib_executor_size, executor=self._zlib_executor, ) assert self._body is not None if self._zlib_executor_size is None and len(self._body) > 1024 * 1024: warnings.warn( "Synchronous compression of large response bodies " f"({len(self._body)} bytes) might block the async event loop. " "Consider providing a custom value to zlib_executor_size/" "zlib_executor response properties or disabling compression on it." ) self._compressed_body = ( await compressor.compress(self._body) + compressor.flush() ) assert self._compressed_body is not None self._headers[hdrs.CONTENT_ENCODING] = coding.value self._headers[hdrs.CONTENT_LENGTH] = str(len(self._compressed_body)) def json_response( data: Any = sentinel, *, text: Optional[str] = None, body: Optional[bytes] = None, status: int = 200, reason: Optional[str] = None, headers: Optional[LooseHeaders] = None, content_type: str = "application/json", dumps: JSONEncoder = json.dumps, ) -> Response: if data is not sentinel: if text or body: raise ValueError("only one of data, text, or body should be specified") else: text = dumps(data) return Response( text=text, body=body, status=status, reason=reason, headers=headers, content_type=content_type, )
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