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Edit File: web_response.py

import asyncio import collections.abc import datetime import enum import json import math import time import warnings import zlib from concurrent.futures import Executor from http.cookies import Morsel, SimpleCookie from typing import ( TYPE_CHECKING, Any, Dict, Iterator, Mapping, MutableMapping, Optional, Tuple, Union, cast, ) from multidict import CIMultiDict, istr from . import hdrs, payload from .abc import AbstractStreamWriter from .helpers import ( ETAG_ANY, PY_38, QUOTED_ETAG_RE, ETag, HeadersMixin, parse_http_date, rfc822_formatted_time, sentinel, validate_etag_value, ) from .http import RESPONSES, SERVER_SOFTWARE, HttpVersion10, HttpVersion11 from .payload import Payload from .typedefs import JSONEncoder, LooseHeaders __all__ = ("ContentCoding", "StreamResponse", "Response", "json_response") if TYPE_CHECKING: # pragma: no cover from .web_request import BaseRequest BaseClass = MutableMapping[str, Any] else: BaseClass = collections.abc.MutableMapping if not PY_38: # allow samesite to be used in python < 3.8 # already permitted in python 3.8, see https://bugs.python.org/issue29613 Morsel._reserved["samesite"] = "SameSite" # type: ignore[attr-defined] 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[str] = SimpleCookie() self._req: Optional[BaseRequest] = None self._payload_writer: Optional[AbstractStreamWriter] = None self._eof_sent = False 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, _RESPONSES: Mapping[int, Tuple[str, str]] = RESPONSES, ) -> 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 = _RESPONSES[self._status][0] except Exception: 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[str]": 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 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) ) 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 and self.status != 204: writer.enable_chunking() headers[hdrs.TRANSFER_ENCODING] = "chunked" if hdrs.CONTENT_LENGTH in headers: del headers[hdrs.CONTENT_LENGTH] else: 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 elif version >= HttpVersion11 and self.status in (100, 101, 102, 103, 204): del headers[hdrs.CONTENT_LENGTH] if self.status not in (204, 304): 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, CONTENT_TYPE: istr = hdrs.CONTENT_TYPE, CONTENT_LENGTH: istr = hdrs.CONTENT_LENGTH, ) -> 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-length header if needed if not self._chunked and CONTENT_LENGTH not in headers: size = body.size if size is not None: headers[CONTENT_LENGTH] = str(size) # set content-type if CONTENT_TYPE not in headers: headers[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._req._method == hdrs.METH_HEAD or self._status in [204, 304]: 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 not self._chunked and hdrs.CONTENT_LENGTH not in self._headers: if not self._body_payload: if self._body is not None: self._headers[hdrs.CONTENT_LENGTH] = str(len(self._body)) else: self._headers[hdrs.CONTENT_LENGTH] = "0" return await super()._start(request) def _compress_body(self, zlib_mode: int) -> None: assert zlib_mode > 0 compressobj = zlib.compressobj(wbits=zlib_mode) body_in = self._body assert body_in is not None self._compressed_body = compressobj.compress(body_in) + compressobj.flush() 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 zlib_mode = ( 16 + zlib.MAX_WBITS if coding == ContentCoding.gzip else zlib.MAX_WBITS ) body_in = self._body assert body_in is not None if ( self._zlib_executor_size is not None and len(body_in) > self._zlib_executor_size ): await asyncio.get_event_loop().run_in_executor( self._zlib_executor, self._compress_body, zlib_mode ) else: self._compress_body(zlib_mode) body_out = self._compressed_body assert body_out is not None self._headers[hdrs.CONTENT_ENCODING] = coding.value self._headers[hdrs.CONTENT_LENGTH] = str(len(body_out)) 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, )