ok
Direktori : /opt/alt/python38/lib64/python3.8/site-packages/aiohttp/ |
Current File : //opt/alt/python38/lib64/python3.8/site-packages/aiohttp/helpers.py |
"""Various helper functions""" import asyncio import base64 import binascii import cgi import datetime import functools import inspect import netrc import os import platform import re import sys import time import warnings import weakref from collections import namedtuple from contextlib import suppress from math import ceil from pathlib import Path from types import TracebackType from typing import ( Any, Callable, Dict, Generator, Generic, Iterable, Iterator, List, Mapping, Optional, Pattern, Set, Tuple, Type, TypeVar, Union, cast, ) from urllib.parse import quote from urllib.request import getproxies import async_timeout import attr from multidict import MultiDict, MultiDictProxy from typing_extensions import Protocol from yarl import URL from . import hdrs from .log import client_logger, internal_logger from .typedefs import PathLike # noqa __all__ = ("BasicAuth", "ChainMapProxy") PY_36 = sys.version_info >= (3, 6) PY_37 = sys.version_info >= (3, 7) PY_38 = sys.version_info >= (3, 8) if not PY_37: import idna_ssl idna_ssl.patch_match_hostname() try: from typing import ContextManager except ImportError: from typing_extensions import ContextManager def all_tasks( loop: Optional[asyncio.AbstractEventLoop] = None, ) -> Set["asyncio.Task[Any]"]: tasks = list(asyncio.Task.all_tasks(loop)) return {t for t in tasks if not t.done()} if PY_37: all_tasks = getattr(asyncio, "all_tasks") _T = TypeVar("_T") _S = TypeVar("_S") sentinel = object() # type: Any NO_EXTENSIONS = bool(os.environ.get("AIOHTTP_NO_EXTENSIONS")) # type: bool # N.B. sys.flags.dev_mode is available on Python 3.7+, use getattr # for compatibility with older versions DEBUG = getattr(sys.flags, "dev_mode", False) or ( not sys.flags.ignore_environment and bool(os.environ.get("PYTHONASYNCIODEBUG")) ) # type: bool CHAR = {chr(i) for i in range(0, 128)} CTL = {chr(i) for i in range(0, 32)} | { chr(127), } SEPARATORS = { "(", ")", "<", ">", "@", ",", ";", ":", "\\", '"', "/", "[", "]", "?", "=", "{", "}", " ", chr(9), } TOKEN = CHAR ^ CTL ^ SEPARATORS class noop: def __await__(self) -> Generator[None, None, None]: yield class BasicAuth(namedtuple("BasicAuth", ["login", "password", "encoding"])): """Http basic authentication helper.""" def __new__( cls, login: str, password: str = "", encoding: str = "latin1" ) -> "BasicAuth": if login is None: raise ValueError("None is not allowed as login value") if password is None: raise ValueError("None is not allowed as password value") if ":" in login: raise ValueError('A ":" is not allowed in login (RFC 1945#section-11.1)') return super().__new__(cls, login, password, encoding) @classmethod def decode(cls, auth_header: str, encoding: str = "latin1") -> "BasicAuth": """Create a BasicAuth object from an Authorization HTTP header.""" try: auth_type, encoded_credentials = auth_header.split(" ", 1) except ValueError: raise ValueError("Could not parse authorization header.") if auth_type.lower() != "basic": raise ValueError("Unknown authorization method %s" % auth_type) try: decoded = base64.b64decode( encoded_credentials.encode("ascii"), validate=True ).decode(encoding) except binascii.Error: raise ValueError("Invalid base64 encoding.") try: # RFC 2617 HTTP Authentication # https://www.ietf.org/rfc/rfc2617.txt # the colon must be present, but the username and password may be # otherwise blank. username, password = decoded.split(":", 1) except ValueError: raise ValueError("Invalid credentials.") return cls(username, password, encoding=encoding) @classmethod def from_url(cls, url: URL, *, encoding: str = "latin1") -> Optional["BasicAuth"]: """Create BasicAuth from url.""" if not isinstance(url, URL): raise TypeError("url should be yarl.URL instance") if url.user is None: return None return cls(url.user, url.password or "", encoding=encoding) def encode(self) -> str: """Encode credentials.""" creds = (f"{self.login}:{self.password}").encode(self.encoding) return "Basic %s" % base64.b64encode(creds).decode(self.encoding) def strip_auth_from_url(url: URL) -> Tuple[URL, Optional[BasicAuth]]: auth = BasicAuth.from_url(url) if auth is None: return url, None else: return url.with_user(None), auth def netrc_from_env() -> Optional[netrc.netrc]: """Attempt to load the netrc file from the path specified by the env-var NETRC or in the default location in the user's home directory. Returns None if it couldn't be found or fails to parse. """ netrc_env = os.environ.get("NETRC") if netrc_env is not None: netrc_path = Path(netrc_env) else: try: home_dir = Path.home() except RuntimeError as e: # pragma: no cover # if pathlib can't resolve home, it may raise a RuntimeError client_logger.debug( "Could not resolve home directory when " "trying to look for .netrc file: %s", e, ) return None netrc_path = home_dir / ( "_netrc" if platform.system() == "Windows" else ".netrc" ) try: return netrc.netrc(str(netrc_path)) except netrc.NetrcParseError as e: client_logger.warning("Could not parse .netrc file: %s", e) except OSError as e: # we couldn't read the file (doesn't exist, permissions, etc.) if netrc_env or netrc_path.is_file(): # only warn if the environment wanted us to load it, # or it appears like the default file does actually exist client_logger.warning("Could not read .netrc file: %s", e) return None @attr.s(auto_attribs=True, frozen=True, slots=True) class ProxyInfo: proxy: URL proxy_auth: Optional[BasicAuth] def proxies_from_env() -> Dict[str, ProxyInfo]: proxy_urls = {k: URL(v) for k, v in getproxies().items() if k in ("http", "https")} netrc_obj = netrc_from_env() stripped = {k: strip_auth_from_url(v) for k, v in proxy_urls.items()} ret = {} for proto, val in stripped.items(): proxy, auth = val if proxy.scheme == "https": client_logger.warning("HTTPS proxies %s are not supported, ignoring", proxy) continue if netrc_obj and auth is None: auth_from_netrc = None if proxy.host is not None: auth_from_netrc = netrc_obj.authenticators(proxy.host) if auth_from_netrc is not None: # auth_from_netrc is a (`user`, `account`, `password`) tuple, # `user` and `account` both can be username, # if `user` is None, use `account` *logins, password = auth_from_netrc login = logins[0] if logins[0] else logins[-1] auth = BasicAuth(cast(str, login), cast(str, password)) ret[proto] = ProxyInfo(proxy, auth) return ret def current_task( loop: Optional[asyncio.AbstractEventLoop] = None, ) -> "Optional[asyncio.Task[Any]]": if PY_37: return asyncio.current_task(loop=loop) else: return asyncio.Task.current_task(loop=loop) def get_running_loop( loop: Optional[asyncio.AbstractEventLoop] = None, ) -> asyncio.AbstractEventLoop: if loop is None: loop = asyncio.get_event_loop() if not loop.is_running(): warnings.warn( "The object should be created within an async function", DeprecationWarning, stacklevel=3, ) if loop.get_debug(): internal_logger.warning( "The object should be created within an async function", stack_info=True ) return loop def isasyncgenfunction(obj: Any) -> bool: func = getattr(inspect, "isasyncgenfunction", None) if func is not None: return func(obj) else: return False @attr.s(auto_attribs=True, frozen=True, slots=True) class MimeType: type: str subtype: str suffix: str parameters: "MultiDictProxy[str]" @functools.lru_cache(maxsize=56) def parse_mimetype(mimetype: str) -> MimeType: """Parses a MIME type into its components. mimetype is a MIME type string. Returns a MimeType object. Example: >>> parse_mimetype('text/html; charset=utf-8') MimeType(type='text', subtype='html', suffix='', parameters={'charset': 'utf-8'}) """ if not mimetype: return MimeType( type="", subtype="", suffix="", parameters=MultiDictProxy(MultiDict()) ) parts = mimetype.split(";") params = MultiDict() # type: MultiDict[str] for item in parts[1:]: if not item: continue key, value = cast( Tuple[str, str], item.split("=", 1) if "=" in item else (item, "") ) params.add(key.lower().strip(), value.strip(' "')) fulltype = parts[0].strip().lower() if fulltype == "*": fulltype = "*/*" mtype, stype = ( cast(Tuple[str, str], fulltype.split("/", 1)) if "/" in fulltype else (fulltype, "") ) stype, suffix = ( cast(Tuple[str, str], stype.split("+", 1)) if "+" in stype else (stype, "") ) return MimeType( type=mtype, subtype=stype, suffix=suffix, parameters=MultiDictProxy(params) ) def guess_filename(obj: Any, default: Optional[str] = None) -> Optional[str]: name = getattr(obj, "name", None) if name and isinstance(name, str) and name[0] != "<" and name[-1] != ">": return Path(name).name return default def content_disposition_header( disptype: str, quote_fields: bool = True, **params: str ) -> str: """Sets ``Content-Disposition`` header. disptype is a disposition type: inline, attachment, form-data. Should be valid extension token (see RFC 2183) params is a dict with disposition params. """ if not disptype or not (TOKEN > set(disptype)): raise ValueError("bad content disposition type {!r}" "".format(disptype)) value = disptype if params: lparams = [] for key, val in params.items(): if not key or not (TOKEN > set(key)): raise ValueError( "bad content disposition parameter" " {!r}={!r}".format(key, val) ) qval = quote(val, "") if quote_fields else val lparams.append((key, '"%s"' % qval)) if key == "filename": lparams.append(("filename*", "utf-8''" + qval)) sparams = "; ".join("=".join(pair) for pair in lparams) value = "; ".join((value, sparams)) return value class _TSelf(Protocol): _cache: Dict[str, Any] class reify(Generic[_T]): """Use as a class method decorator. It operates almost exactly like the Python `@property` decorator, but it puts the result of the method it decorates into the instance dict after the first call, effectively replacing the function it decorates with an instance variable. It is, in Python parlance, a data descriptor. """ def __init__(self, wrapped: Callable[..., _T]) -> None: self.wrapped = wrapped self.__doc__ = wrapped.__doc__ self.name = wrapped.__name__ def __get__(self, inst: _TSelf, owner: Optional[Type[Any]] = None) -> _T: try: try: return inst._cache[self.name] except KeyError: val = self.wrapped(inst) inst._cache[self.name] = val return val except AttributeError: if inst is None: return self raise def __set__(self, inst: _TSelf, value: _T) -> None: raise AttributeError("reified property is read-only") reify_py = reify try: from ._helpers import reify as reify_c if not NO_EXTENSIONS: reify = reify_c # type: ignore except ImportError: pass _ipv4_pattern = ( r"^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}" r"(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$" ) _ipv6_pattern = ( r"^(?:(?:(?:[A-F0-9]{1,4}:){6}|(?=(?:[A-F0-9]{0,4}:){0,6}" r"(?:[0-9]{1,3}\.){3}[0-9]{1,3}$)(([0-9A-F]{1,4}:){0,5}|:)" r"((:[0-9A-F]{1,4}){1,5}:|:)|::(?:[A-F0-9]{1,4}:){5})" r"(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.){3}" r"(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])|(?:[A-F0-9]{1,4}:){7}" r"[A-F0-9]{1,4}|(?=(?:[A-F0-9]{0,4}:){0,7}[A-F0-9]{0,4}$)" r"(([0-9A-F]{1,4}:){1,7}|:)((:[0-9A-F]{1,4}){1,7}|:)|(?:[A-F0-9]{1,4}:){7}" r":|:(:[A-F0-9]{1,4}){7})$" ) _ipv4_regex = re.compile(_ipv4_pattern) _ipv6_regex = re.compile(_ipv6_pattern, flags=re.IGNORECASE) _ipv4_regexb = re.compile(_ipv4_pattern.encode("ascii")) _ipv6_regexb = re.compile(_ipv6_pattern.encode("ascii"), flags=re.IGNORECASE) def _is_ip_address( regex: Pattern[str], regexb: Pattern[bytes], host: Optional[Union[str, bytes]] ) -> bool: if host is None: return False if isinstance(host, str): return bool(regex.match(host)) elif isinstance(host, (bytes, bytearray, memoryview)): return bool(regexb.match(host)) else: raise TypeError("{} [{}] is not a str or bytes".format(host, type(host))) is_ipv4_address = functools.partial(_is_ip_address, _ipv4_regex, _ipv4_regexb) is_ipv6_address = functools.partial(_is_ip_address, _ipv6_regex, _ipv6_regexb) def is_ip_address(host: Optional[Union[str, bytes, bytearray, memoryview]]) -> bool: return is_ipv4_address(host) or is_ipv6_address(host) def next_whole_second() -> datetime.datetime: """Return current time rounded up to the next whole second.""" return datetime.datetime.now(datetime.timezone.utc).replace( microsecond=0 ) + datetime.timedelta(seconds=0) _cached_current_datetime = None # type: Optional[int] _cached_formatted_datetime = "" def rfc822_formatted_time() -> str: global _cached_current_datetime global _cached_formatted_datetime now = int(time.time()) if now != _cached_current_datetime: # Weekday and month names for HTTP date/time formatting; # always English! # Tuples are constants stored in codeobject! _weekdayname = ("Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun") _monthname = ( "", # Dummy so we can use 1-based month numbers "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", ) year, month, day, hh, mm, ss, wd, *tail = time.gmtime(now) _cached_formatted_datetime = "%s, %02d %3s %4d %02d:%02d:%02d GMT" % ( _weekdayname[wd], day, _monthname[month], year, hh, mm, ss, ) _cached_current_datetime = now return _cached_formatted_datetime def _weakref_handle(info): # type: ignore ref, name = info ob = ref() if ob is not None: with suppress(Exception): getattr(ob, name)() def weakref_handle(ob, name, timeout, loop): # type: ignore if timeout is not None and timeout > 0: when = loop.time() + timeout if timeout >= 5: when = ceil(when) return loop.call_at(when, _weakref_handle, (weakref.ref(ob), name)) def call_later(cb, timeout, loop): # type: ignore if timeout is not None and timeout > 0: when = loop.time() + timeout if timeout > 5: when = ceil(when) return loop.call_at(when, cb) class TimeoutHandle: """ Timeout handle """ def __init__( self, loop: asyncio.AbstractEventLoop, timeout: Optional[float] ) -> None: self._timeout = timeout self._loop = loop self._callbacks = ( [] ) # type: List[Tuple[Callable[..., None], Tuple[Any, ...], Dict[str, Any]]] def register( self, callback: Callable[..., None], *args: Any, **kwargs: Any ) -> None: self._callbacks.append((callback, args, kwargs)) def close(self) -> None: self._callbacks.clear() def start(self) -> Optional[asyncio.Handle]: timeout = self._timeout if timeout is not None and timeout > 0: when = self._loop.time() + timeout if timeout >= 5: when = ceil(when) return self._loop.call_at(when, self.__call__) else: return None def timer(self) -> "BaseTimerContext": if self._timeout is not None and self._timeout > 0: timer = TimerContext(self._loop) self.register(timer.timeout) return timer else: return TimerNoop() def __call__(self) -> None: for cb, args, kwargs in self._callbacks: with suppress(Exception): cb(*args, **kwargs) self._callbacks.clear() class BaseTimerContext(ContextManager["BaseTimerContext"]): pass class TimerNoop(BaseTimerContext): def __enter__(self) -> BaseTimerContext: return self def __exit__( self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType], ) -> None: return class TimerContext(BaseTimerContext): """ Low resolution timeout context manager """ def __init__(self, loop: asyncio.AbstractEventLoop) -> None: self._loop = loop self._tasks = [] # type: List[asyncio.Task[Any]] self._cancelled = False def __enter__(self) -> BaseTimerContext: task = current_task(loop=self._loop) if task is None: raise RuntimeError( "Timeout context manager should be used " "inside a task" ) if self._cancelled: task.cancel() raise asyncio.TimeoutError from None self._tasks.append(task) return self def __exit__( self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType], ) -> Optional[bool]: if self._tasks: self._tasks.pop() if exc_type is asyncio.CancelledError and self._cancelled: raise asyncio.TimeoutError from None return None def timeout(self) -> None: if not self._cancelled: for task in set(self._tasks): task.cancel() self._cancelled = True class CeilTimeout(async_timeout.timeout): def __enter__(self) -> async_timeout.timeout: if self._timeout is not None: self._task = current_task(loop=self._loop) if self._task is None: raise RuntimeError( "Timeout context manager should be used inside a task" ) now = self._loop.time() delay = self._timeout when = now + delay if delay > 5: when = ceil(when) self._cancel_handler = self._loop.call_at(when, self._cancel_task) return self class HeadersMixin: ATTRS = frozenset(["_content_type", "_content_dict", "_stored_content_type"]) _content_type = None # type: Optional[str] _content_dict = None # type: Optional[Dict[str, str]] _stored_content_type = sentinel def _parse_content_type(self, raw: str) -> None: self._stored_content_type = raw if raw is None: # default value according to RFC 2616 self._content_type = "application/octet-stream" self._content_dict = {} else: self._content_type, self._content_dict = cgi.parse_header(raw) @property def content_type(self) -> str: """The value of content part for Content-Type HTTP header.""" raw = self._headers.get(hdrs.CONTENT_TYPE) # type: ignore if self._stored_content_type != raw: self._parse_content_type(raw) return self._content_type # type: ignore @property def charset(self) -> Optional[str]: """The value of charset part for Content-Type HTTP header.""" raw = self._headers.get(hdrs.CONTENT_TYPE) # type: ignore if self._stored_content_type != raw: self._parse_content_type(raw) return self._content_dict.get("charset") # type: ignore @property def content_length(self) -> Optional[int]: """The value of Content-Length HTTP header.""" content_length = self._headers.get(hdrs.CONTENT_LENGTH) # type: ignore if content_length is not None: return int(content_length) else: return None def set_result(fut: "asyncio.Future[_T]", result: _T) -> None: if not fut.done(): fut.set_result(result) def set_exception(fut: "asyncio.Future[_T]", exc: BaseException) -> None: if not fut.done(): fut.set_exception(exc) class ChainMapProxy(Mapping[str, Any]): __slots__ = ("_maps",) def __init__(self, maps: Iterable[Mapping[str, Any]]) -> None: self._maps = tuple(maps) def __init_subclass__(cls) -> None: raise TypeError( "Inheritance class {} from ChainMapProxy " "is forbidden".format(cls.__name__) ) def __getitem__(self, key: str) -> Any: for mapping in self._maps: try: return mapping[key] except KeyError: pass raise KeyError(key) def get(self, key: str, default: Any = None) -> Any: return self[key] if key in self else default def __len__(self) -> int: # reuses stored hash values if possible return len(set().union(*self._maps)) # type: ignore def __iter__(self) -> Iterator[str]: d = {} # type: Dict[str, Any] for mapping in reversed(self._maps): # reuses stored hash values if possible d.update(mapping) return iter(d) def __contains__(self, key: object) -> bool: return any(key in m for m in self._maps) def __bool__(self) -> bool: return any(self._maps) def __repr__(self) -> str: content = ", ".join(map(repr, self._maps)) return f"ChainMapProxy({content})"