358 lines
11 KiB
Python
358 lines
11 KiB
Python
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import asyncio
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import datetime
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import os # noqa
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import pathlib
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import pickle
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import re
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from collections import defaultdict
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from http.cookies import BaseCookie, Morsel, SimpleCookie # noqa
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from math import ceil
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from typing import ( # noqa
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DefaultDict,
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Dict,
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Iterable,
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Iterator,
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Mapping,
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Optional,
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Set,
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Tuple,
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Union,
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cast,
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)
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from yarl import URL
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from .abc import AbstractCookieJar
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from .helpers import is_ip_address
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from .typedefs import LooseCookies, PathLike
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__all__ = ('CookieJar', 'DummyCookieJar')
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CookieItem = Union[str, 'Morsel[str]']
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class CookieJar(AbstractCookieJar):
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"""Implements cookie storage adhering to RFC 6265."""
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DATE_TOKENS_RE = re.compile(
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r"[\x09\x20-\x2F\x3B-\x40\x5B-\x60\x7B-\x7E]*"
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r"(?P<token>[\x00-\x08\x0A-\x1F\d:a-zA-Z\x7F-\xFF]+)")
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DATE_HMS_TIME_RE = re.compile(r"(\d{1,2}):(\d{1,2}):(\d{1,2})")
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DATE_DAY_OF_MONTH_RE = re.compile(r"(\d{1,2})")
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DATE_MONTH_RE = re.compile("(jan)|(feb)|(mar)|(apr)|(may)|(jun)|(jul)|"
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"(aug)|(sep)|(oct)|(nov)|(dec)", re.I)
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DATE_YEAR_RE = re.compile(r"(\d{2,4})")
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MAX_TIME = 2051215261.0 # so far in future (2035-01-01)
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def __init__(self, *, unsafe: bool=False,
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loop: Optional[asyncio.AbstractEventLoop]=None) -> None:
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super().__init__(loop=loop)
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self._cookies = defaultdict(SimpleCookie) #type: DefaultDict[str, SimpleCookie] # noqa
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self._host_only_cookies = set() # type: Set[Tuple[str, str]]
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self._unsafe = unsafe
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self._next_expiration = ceil(self._loop.time())
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self._expirations = {} # type: Dict[Tuple[str, str], int]
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def save(self, file_path: PathLike) -> None:
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file_path = pathlib.Path(file_path)
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with file_path.open(mode='wb') as f:
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pickle.dump(self._cookies, f, pickle.HIGHEST_PROTOCOL)
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def load(self, file_path: PathLike) -> None:
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file_path = pathlib.Path(file_path)
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with file_path.open(mode='rb') as f:
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self._cookies = pickle.load(f)
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def clear(self) -> None:
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self._cookies.clear()
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self._host_only_cookies.clear()
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self._next_expiration = ceil(self._loop.time())
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self._expirations.clear()
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def __iter__(self) -> 'Iterator[Morsel[str]]':
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self._do_expiration()
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for val in self._cookies.values():
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yield from val.values()
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def __len__(self) -> int:
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return sum(1 for i in self)
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def _do_expiration(self) -> None:
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now = self._loop.time()
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if self._next_expiration > now:
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return
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if not self._expirations:
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return
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next_expiration = self.MAX_TIME
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to_del = []
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cookies = self._cookies
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expirations = self._expirations
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for (domain, name), when in expirations.items():
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if when <= now:
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cookies[domain].pop(name, None)
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to_del.append((domain, name))
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self._host_only_cookies.discard((domain, name))
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else:
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next_expiration = min(next_expiration, when)
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for key in to_del:
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del expirations[key]
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self._next_expiration = ceil(next_expiration)
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def _expire_cookie(self, when: float, domain: str, name: str) -> None:
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iwhen = int(when)
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self._next_expiration = min(self._next_expiration, iwhen)
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self._expirations[(domain, name)] = iwhen
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def update_cookies(self,
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cookies: LooseCookies,
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response_url: URL=URL()) -> None:
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"""Update cookies."""
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hostname = response_url.raw_host
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if not self._unsafe and is_ip_address(hostname):
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# Don't accept cookies from IPs
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return
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if isinstance(cookies, Mapping):
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cookies = cookies.items() # type: ignore
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for name, cookie in cookies:
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if not isinstance(cookie, Morsel):
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tmp = SimpleCookie()
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tmp[name] = cookie # type: ignore
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cookie = tmp[name]
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domain = cookie["domain"]
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# ignore domains with trailing dots
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if domain.endswith('.'):
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domain = ""
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del cookie["domain"]
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if not domain and hostname is not None:
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# Set the cookie's domain to the response hostname
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# and set its host-only-flag
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self._host_only_cookies.add((hostname, name))
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domain = cookie["domain"] = hostname
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if domain.startswith("."):
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# Remove leading dot
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domain = domain[1:]
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cookie["domain"] = domain
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if hostname and not self._is_domain_match(domain, hostname):
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# Setting cookies for different domains is not allowed
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continue
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path = cookie["path"]
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if not path or not path.startswith("/"):
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# Set the cookie's path to the response path
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path = response_url.path
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if not path.startswith("/"):
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path = "/"
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else:
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# Cut everything from the last slash to the end
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path = "/" + path[1:path.rfind("/")]
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cookie["path"] = path
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max_age = cookie["max-age"]
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if max_age:
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try:
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delta_seconds = int(max_age)
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self._expire_cookie(self._loop.time() + delta_seconds,
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domain, name)
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except ValueError:
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cookie["max-age"] = ""
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else:
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expires = cookie["expires"]
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if expires:
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expire_time = self._parse_date(expires)
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if expire_time:
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self._expire_cookie(expire_time.timestamp(),
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domain, name)
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else:
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cookie["expires"] = ""
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self._cookies[domain][name] = cookie
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self._do_expiration()
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def filter_cookies(self, request_url: URL=URL()) -> 'BaseCookie[str]':
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"""Returns this jar's cookies filtered by their attributes."""
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self._do_expiration()
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request_url = URL(request_url)
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filtered = SimpleCookie()
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hostname = request_url.raw_host or ""
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is_not_secure = request_url.scheme not in ("https", "wss")
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for cookie in self:
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name = cookie.key
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domain = cookie["domain"]
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# Send shared cookies
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if not domain:
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filtered[name] = cookie.value
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continue
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if not self._unsafe and is_ip_address(hostname):
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continue
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if (domain, name) in self._host_only_cookies:
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if domain != hostname:
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continue
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elif not self._is_domain_match(domain, hostname):
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continue
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if not self._is_path_match(request_url.path, cookie["path"]):
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continue
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if is_not_secure and cookie["secure"]:
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continue
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# It's critical we use the Morsel so the coded_value
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# (based on cookie version) is preserved
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mrsl_val = cast('Morsel[str]', cookie.get(cookie.key, Morsel()))
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mrsl_val.set(cookie.key, cookie.value, cookie.coded_value)
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filtered[name] = mrsl_val
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return filtered
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@staticmethod
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def _is_domain_match(domain: str, hostname: str) -> bool:
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"""Implements domain matching adhering to RFC 6265."""
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if hostname == domain:
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return True
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if not hostname.endswith(domain):
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return False
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non_matching = hostname[:-len(domain)]
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if not non_matching.endswith("."):
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return False
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return not is_ip_address(hostname)
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@staticmethod
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def _is_path_match(req_path: str, cookie_path: str) -> bool:
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"""Implements path matching adhering to RFC 6265."""
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if not req_path.startswith("/"):
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req_path = "/"
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if req_path == cookie_path:
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return True
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if not req_path.startswith(cookie_path):
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return False
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if cookie_path.endswith("/"):
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return True
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non_matching = req_path[len(cookie_path):]
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return non_matching.startswith("/")
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@classmethod
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def _parse_date(cls, date_str: str) -> Optional[datetime.datetime]:
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"""Implements date string parsing adhering to RFC 6265."""
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if not date_str:
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return None
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found_time = False
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found_day = False
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found_month = False
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found_year = False
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hour = minute = second = 0
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day = 0
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month = 0
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year = 0
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for token_match in cls.DATE_TOKENS_RE.finditer(date_str):
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token = token_match.group("token")
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if not found_time:
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time_match = cls.DATE_HMS_TIME_RE.match(token)
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if time_match:
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found_time = True
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hour, minute, second = [
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int(s) for s in time_match.groups()]
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continue
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if not found_day:
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day_match = cls.DATE_DAY_OF_MONTH_RE.match(token)
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if day_match:
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found_day = True
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day = int(day_match.group())
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continue
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if not found_month:
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month_match = cls.DATE_MONTH_RE.match(token)
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if month_match:
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found_month = True
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month = month_match.lastindex
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continue
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if not found_year:
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year_match = cls.DATE_YEAR_RE.match(token)
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if year_match:
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found_year = True
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year = int(year_match.group())
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if 70 <= year <= 99:
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year += 1900
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elif 0 <= year <= 69:
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year += 2000
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if False in (found_day, found_month, found_year, found_time):
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return None
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if not 1 <= day <= 31:
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return None
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if year < 1601 or hour > 23 or minute > 59 or second > 59:
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return None
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return datetime.datetime(year, month, day,
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hour, minute, second,
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tzinfo=datetime.timezone.utc)
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class DummyCookieJar(AbstractCookieJar):
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"""Implements a dummy cookie storage.
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It can be used with the ClientSession when no cookie processing is needed.
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"""
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def __init__(self, *,
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loop: Optional[asyncio.AbstractEventLoop]=None) -> None:
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super().__init__(loop=loop)
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def __iter__(self) -> 'Iterator[Morsel[str]]':
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while False:
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yield None
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def __len__(self) -> int:
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return 0
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def clear(self) -> None:
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pass
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def update_cookies(self,
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cookies: LooseCookies,
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response_url: URL=URL()) -> None:
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pass
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def filter_cookies(self, request_url: URL) -> 'BaseCookie[str]':
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return SimpleCookie()
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