718 lines
25 KiB
Python
718 lines
25 KiB
Python
import asyncio # noqa
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import collections.abc # noqa
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import datetime
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import enum
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import json
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import math
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import time
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import warnings
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import zlib
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from concurrent.futures import Executor
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from email.utils import parsedate
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from http.cookies import SimpleCookie
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from typing import ( # noqa
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TYPE_CHECKING,
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Any,
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Dict,
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Iterator,
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Mapping,
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MutableMapping,
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Optional,
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Tuple,
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Union,
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cast,
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)
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from multidict import CIMultiDict, istr
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from . import hdrs, payload
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from .abc import AbstractStreamWriter
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from .helpers import HeadersMixin, rfc822_formatted_time, sentinel
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from .http import RESPONSES, SERVER_SOFTWARE, HttpVersion10, HttpVersion11
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from .payload import Payload
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from .typedefs import JSONEncoder, LooseHeaders
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__all__ = ('ContentCoding', 'StreamResponse', 'Response', 'json_response')
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if TYPE_CHECKING: # pragma: no cover
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from .web_request import BaseRequest # noqa
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BaseClass = MutableMapping[str, Any]
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else:
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BaseClass = collections.abc.MutableMapping
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class ContentCoding(enum.Enum):
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# The content codings that we have support for.
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#
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# Additional registered codings are listed at:
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# https://www.iana.org/assignments/http-parameters/http-parameters.xhtml#content-coding
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deflate = 'deflate'
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gzip = 'gzip'
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identity = 'identity'
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############################################################
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# HTTP Response classes
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############################################################
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class StreamResponse(BaseClass, HeadersMixin):
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_length_check = True
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def __init__(self, *,
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status: int=200,
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reason: Optional[str]=None,
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headers: Optional[LooseHeaders]=None) -> None:
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self._body = None
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self._keep_alive = None # type: Optional[bool]
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self._chunked = False
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self._compression = False
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self._compression_force = None # type: Optional[ContentCoding]
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self._cookies = SimpleCookie()
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self._req = None # type: Optional[BaseRequest]
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self._payload_writer = None # type: Optional[AbstractStreamWriter]
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self._eof_sent = False
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self._body_length = 0
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self._state = {} # type: Dict[str, Any]
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if headers is not None:
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self._headers = CIMultiDict(headers) # type: CIMultiDict[str]
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else:
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self._headers = CIMultiDict()
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self.set_status(status, reason)
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@property
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def prepared(self) -> bool:
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return self._payload_writer is not None
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@property
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def task(self) -> 'asyncio.Task[None]':
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return getattr(self._req, 'task', None)
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@property
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def status(self) -> int:
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return self._status
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@property
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def chunked(self) -> bool:
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return self._chunked
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@property
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def compression(self) -> bool:
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return self._compression
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@property
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def reason(self) -> str:
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return self._reason
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def set_status(self, status: int,
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reason: Optional[str]=None,
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_RESPONSES: Mapping[int,
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Tuple[str, str]]=RESPONSES) -> None:
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assert not self.prepared, \
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'Cannot change the response status code after ' \
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'the headers have been sent'
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self._status = int(status)
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if reason is None:
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try:
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reason = _RESPONSES[self._status][0]
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except Exception:
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reason = ''
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self._reason = reason
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@property
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def keep_alive(self) -> Optional[bool]:
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return self._keep_alive
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def force_close(self) -> None:
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self._keep_alive = False
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@property
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def body_length(self) -> int:
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return self._body_length
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@property
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def output_length(self) -> int:
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warnings.warn('output_length is deprecated', DeprecationWarning)
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assert self._payload_writer
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return self._payload_writer.buffer_size
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def enable_chunked_encoding(self, chunk_size: Optional[int]=None) -> None:
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"""Enables automatic chunked transfer encoding."""
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self._chunked = True
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if hdrs.CONTENT_LENGTH in self._headers:
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raise RuntimeError("You can't enable chunked encoding when "
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"a content length is set")
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if chunk_size is not None:
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warnings.warn('Chunk size is deprecated #1615', DeprecationWarning)
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def enable_compression(self,
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force: Optional[Union[bool, ContentCoding]]=None
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) -> None:
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"""Enables response compression encoding."""
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# Backwards compatibility for when force was a bool <0.17.
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if type(force) == bool:
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force = ContentCoding.deflate if force else ContentCoding.identity
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warnings.warn("Using boolean for force is deprecated #3318",
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DeprecationWarning)
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elif force is not None:
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assert isinstance(force, ContentCoding), ("force should one of "
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"None, bool or "
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"ContentEncoding")
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self._compression = True
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self._compression_force = force
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@property
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def headers(self) -> 'CIMultiDict[str]':
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return self._headers
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@property
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def cookies(self) -> SimpleCookie:
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return self._cookies
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def set_cookie(self, name: str, value: str, *,
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expires: Optional[str]=None,
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domain: Optional[str]=None,
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max_age: Optional[Union[int, str]]=None,
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path: str='/',
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secure: Optional[str]=None,
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httponly: Optional[str]=None,
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version: Optional[str]=None) -> None:
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"""Set or update response cookie.
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Sets new cookie or updates existent with new value.
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Also updates only those params which are not None.
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"""
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old = self._cookies.get(name)
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if old is not None and old.coded_value == '':
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# deleted cookie
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self._cookies.pop(name, None)
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self._cookies[name] = value
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c = self._cookies[name]
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if expires is not None:
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c['expires'] = expires
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elif c.get('expires') == 'Thu, 01 Jan 1970 00:00:00 GMT':
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del c['expires']
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if domain is not None:
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c['domain'] = domain
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if max_age is not None:
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c['max-age'] = str(max_age)
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elif 'max-age' in c:
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del c['max-age']
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c['path'] = path
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if secure is not None:
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c['secure'] = secure
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if httponly is not None:
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c['httponly'] = httponly
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if version is not None:
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c['version'] = version
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def del_cookie(self, name: str, *,
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domain: Optional[str]=None,
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path: str='/') -> None:
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"""Delete cookie.
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Creates new empty expired cookie.
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"""
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# TODO: do we need domain/path here?
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self._cookies.pop(name, None)
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self.set_cookie(name, '', max_age=0,
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expires="Thu, 01 Jan 1970 00:00:00 GMT",
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domain=domain, path=path)
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@property
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def content_length(self) -> Optional[int]:
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# Just a placeholder for adding setter
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return super().content_length
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@content_length.setter
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def content_length(self, value: Optional[int]) -> None:
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if value is not None:
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value = int(value)
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if self._chunked:
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raise RuntimeError("You can't set content length when "
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"chunked encoding is enable")
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self._headers[hdrs.CONTENT_LENGTH] = str(value)
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else:
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self._headers.pop(hdrs.CONTENT_LENGTH, None)
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@property
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def content_type(self) -> str:
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# Just a placeholder for adding setter
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return super().content_type
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@content_type.setter
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def content_type(self, value: str) -> None:
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self.content_type # read header values if needed
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self._content_type = str(value)
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self._generate_content_type_header()
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@property
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def charset(self) -> Optional[str]:
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# Just a placeholder for adding setter
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return super().charset
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@charset.setter
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def charset(self, value: Optional[str]) -> None:
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ctype = self.content_type # read header values if needed
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if ctype == 'application/octet-stream':
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raise RuntimeError("Setting charset for application/octet-stream "
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"doesn't make sense, setup content_type first")
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assert self._content_dict is not None
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if value is None:
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self._content_dict.pop('charset', None)
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else:
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self._content_dict['charset'] = str(value).lower()
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self._generate_content_type_header()
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@property
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def last_modified(self) -> Optional[datetime.datetime]:
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"""The value of Last-Modified HTTP header, or None.
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This header is represented as a `datetime` object.
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"""
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httpdate = self._headers.get(hdrs.LAST_MODIFIED)
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if httpdate is not None:
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timetuple = parsedate(httpdate)
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if timetuple is not None:
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return datetime.datetime(*timetuple[:6],
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tzinfo=datetime.timezone.utc)
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return None
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@last_modified.setter
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def last_modified(self,
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value: Optional[
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Union[int, float, datetime.datetime, str]]) -> None:
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if value is None:
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self._headers.pop(hdrs.LAST_MODIFIED, None)
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elif isinstance(value, (int, float)):
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self._headers[hdrs.LAST_MODIFIED] = time.strftime(
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"%a, %d %b %Y %H:%M:%S GMT", time.gmtime(math.ceil(value)))
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elif isinstance(value, datetime.datetime):
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self._headers[hdrs.LAST_MODIFIED] = time.strftime(
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"%a, %d %b %Y %H:%M:%S GMT", value.utctimetuple())
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elif isinstance(value, str):
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self._headers[hdrs.LAST_MODIFIED] = value
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def _generate_content_type_header(
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self,
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CONTENT_TYPE: istr=hdrs.CONTENT_TYPE) -> None:
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assert self._content_dict is not None
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assert self._content_type is not None
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params = '; '.join("{}={}".format(k, v)
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for k, v in self._content_dict.items())
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if params:
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ctype = self._content_type + '; ' + params
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else:
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ctype = self._content_type
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self._headers[CONTENT_TYPE] = ctype
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async def _do_start_compression(self, coding: ContentCoding) -> None:
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if coding != ContentCoding.identity:
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assert self._payload_writer is not None
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self._headers[hdrs.CONTENT_ENCODING] = coding.value
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self._payload_writer.enable_compression(coding.value)
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# Compressed payload may have different content length,
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# remove the header
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self._headers.popall(hdrs.CONTENT_LENGTH, None)
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async def _start_compression(self, request: 'BaseRequest') -> None:
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if self._compression_force:
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await self._do_start_compression(self._compression_force)
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else:
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accept_encoding = request.headers.get(
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hdrs.ACCEPT_ENCODING, '').lower()
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for coding in ContentCoding:
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if coding.value in accept_encoding:
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await self._do_start_compression(coding)
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return
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async def prepare(
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self,
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request: 'BaseRequest'
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) -> Optional[AbstractStreamWriter]:
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if self._eof_sent:
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return None
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if self._payload_writer is not None:
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return self._payload_writer
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await request._prepare_hook(self)
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return await self._start(request)
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async def _start(self, request: 'BaseRequest') -> AbstractStreamWriter:
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self._req = request
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keep_alive = self._keep_alive
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if keep_alive is None:
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keep_alive = request.keep_alive
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self._keep_alive = keep_alive
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version = request.version
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writer = self._payload_writer = request._payload_writer
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headers = self._headers
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for cookie in self._cookies.values():
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value = cookie.output(header='')[1:]
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headers.add(hdrs.SET_COOKIE, value)
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if self._compression:
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await self._start_compression(request)
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if self._chunked:
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if version != HttpVersion11:
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raise RuntimeError(
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"Using chunked encoding is forbidden "
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"for HTTP/{0.major}.{0.minor}".format(request.version))
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writer.enable_chunking()
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headers[hdrs.TRANSFER_ENCODING] = 'chunked'
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if hdrs.CONTENT_LENGTH in headers:
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del headers[hdrs.CONTENT_LENGTH]
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elif self._length_check:
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writer.length = self.content_length
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if writer.length is None:
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if version >= HttpVersion11:
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writer.enable_chunking()
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headers[hdrs.TRANSFER_ENCODING] = 'chunked'
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if hdrs.CONTENT_LENGTH in headers:
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del headers[hdrs.CONTENT_LENGTH]
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else:
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keep_alive = False
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headers.setdefault(hdrs.CONTENT_TYPE, 'application/octet-stream')
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headers.setdefault(hdrs.DATE, rfc822_formatted_time())
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headers.setdefault(hdrs.SERVER, SERVER_SOFTWARE)
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# connection header
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if hdrs.CONNECTION not in headers:
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if keep_alive:
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if version == HttpVersion10:
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headers[hdrs.CONNECTION] = 'keep-alive'
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else:
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if version == HttpVersion11:
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headers[hdrs.CONNECTION] = 'close'
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# status line
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status_line = 'HTTP/{}.{} {} {}'.format(
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version[0], version[1], self._status, self._reason)
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await writer.write_headers(status_line, headers)
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return writer
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async def write(self, data: bytes) -> None:
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assert isinstance(data, (bytes, bytearray, memoryview)), \
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"data argument must be byte-ish (%r)" % type(data)
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if self._eof_sent:
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raise RuntimeError("Cannot call write() after write_eof()")
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if self._payload_writer is None:
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raise RuntimeError("Cannot call write() before prepare()")
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await self._payload_writer.write(data)
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async def drain(self) -> None:
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assert not self._eof_sent, "EOF has already been sent"
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assert self._payload_writer is not None, \
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"Response has not been started"
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warnings.warn("drain method is deprecated, use await resp.write()",
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DeprecationWarning,
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stacklevel=2)
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await self._payload_writer.drain()
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async def write_eof(self, data: bytes=b'') -> None:
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assert isinstance(data, (bytes, bytearray, memoryview)), \
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"data argument must be byte-ish (%r)" % type(data)
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if self._eof_sent:
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return
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assert self._payload_writer is not None, \
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"Response has not been started"
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await self._payload_writer.write_eof(data)
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self._eof_sent = True
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self._req = None
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self._body_length = self._payload_writer.output_size
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self._payload_writer = None
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def __repr__(self) -> str:
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if self._eof_sent:
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info = "eof"
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elif self.prepared:
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assert self._req is not None
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info = "{} {} ".format(self._req.method, self._req.path)
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else:
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info = "not prepared"
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return "<{} {} {}>".format(self.__class__.__name__,
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self.reason, info)
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def __getitem__(self, key: str) -> Any:
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return self._state[key]
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def __setitem__(self, key: str, value: Any) -> None:
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self._state[key] = value
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def __delitem__(self, key: str) -> None:
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del self._state[key]
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def __len__(self) -> int:
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return len(self._state)
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def __iter__(self) -> Iterator[str]:
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return iter(self._state)
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def __hash__(self) -> int:
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return hash(id(self))
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def __eq__(self, other: object) -> bool:
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return self is other
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class Response(StreamResponse):
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def __init__(self, *,
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body: Any=None,
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status: int=200,
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reason: Optional[str]=None,
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text: Optional[str]=None,
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headers: Optional[LooseHeaders]=None,
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content_type: Optional[str]=None,
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charset: Optional[str]=None,
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zlib_executor_size: Optional[int]=None,
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zlib_executor: Executor=None) -> None:
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if body is not None and text is not None:
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raise ValueError("body and text are not allowed together")
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if headers is None:
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real_headers = CIMultiDict() # type: CIMultiDict[str]
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elif not isinstance(headers, CIMultiDict):
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real_headers = CIMultiDict(headers)
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else:
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real_headers = headers # = cast('CIMultiDict[str]', headers)
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if content_type is not None and "charset" in content_type:
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raise ValueError("charset must not be in content_type "
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"argument")
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if text is not None:
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if hdrs.CONTENT_TYPE in real_headers:
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if content_type or charset:
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raise ValueError("passing both Content-Type header and "
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"content_type or charset params "
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"is forbidden")
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else:
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# fast path for filling headers
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if not isinstance(text, str):
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raise TypeError("text argument must be str (%r)" %
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type(text))
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if content_type is None:
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content_type = 'text/plain'
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if charset is None:
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charset = 'utf-8'
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real_headers[hdrs.CONTENT_TYPE] = (
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content_type + '; charset=' + charset)
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body = text.encode(charset)
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text = None
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else:
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if hdrs.CONTENT_TYPE in real_headers:
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if content_type is not None or charset is not None:
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raise ValueError("passing both Content-Type header and "
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"content_type or charset params "
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"is forbidden")
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else:
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if content_type is not None:
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if charset is not None:
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content_type += '; charset=' + charset
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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 = None # type: Optional[bytes]
|
|
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 = None # type: Optional[bytes]
|
|
self._body_payload = False # type: bool
|
|
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 = self._body # type: Optional[Union[bytes, Payload]]
|
|
else:
|
|
body = self._compressed_body
|
|
assert not data, "data arg is not supported, got {!r}".format(data)
|
|
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:
|
|
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: str=None,
|
|
body: bytes=None,
|
|
status: int=200,
|
|
reason: Optional[str]=None,
|
|
headers: 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)
|