287 lines
9.3 KiB
Python
287 lines
9.3 KiB
Python
# flake8: noqa: S310
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from __future__ import annotations
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import http.cookiejar
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import json
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import logging
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import urllib.request
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from collections.abc import Callable
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from typing import Any, ClassVar
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from urllib.parse import urlparse
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from yt_dlp.networking.common import (
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_REQUEST_HANDLERS,
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_RH_PREFERENCES,
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Request,
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RequestDirector,
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RequestHandler,
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Response,
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register_preference,
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register_rh,
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)
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from yt_dlp.networking.exceptions import HTTPError
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from yt_dlp.utils.networking import clean_headers
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LOG: logging.Logger = logging.getLogger(__name__)
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SolverFn = Callable[[Request, Response, RequestHandler], Request | None]
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def cf_solver(request: Request, _response: Response, handler: RequestHandler) -> Request | None:
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"""
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A Cloudflare solver that uses FlareSolverr/FlareSolverr to solve challenges.
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Args:
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request (Request): The original request that triggered the challenge.
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_response (Response): The response that contained the challenge.
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handler (RequestHandler): The request handler invoking the solver.
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Returns:
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Request | None: The modified request with solved credentials, or None if solving failed.
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"""
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from app.library.config import Config
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config = Config.get_instance()
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if not config.flaresolverr_url:
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return None
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parsed_endpoint = urlparse(config.flaresolverr_url)
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if parsed_endpoint.scheme not in ("http", "https"):
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return None
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if request.data is not None and request.method not in ("GET", None):
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return None
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method: str = request.method.lower() if isinstance(request.method, str) else "get"
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if method not in ("get", "head"):
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method = "get"
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payload: dict[str, Any] = {
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"cmd": f"request.{method}",
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"url": request.url,
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"maxTimeout": int(getattr(config, "flaresolverr_max_timeout", 60) * 1000),
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}
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cookiejar = handler._get_cookiejar(request)
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cookies = (
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[
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{
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"name": cookie.name,
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"value": cookie.value,
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"domain": cookie.domain or urlparse(request.url).hostname or "",
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"path": cookie.path or "/",
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}
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for cookie in cookiejar
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]
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if cookiejar
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else []
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)
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if cookies:
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payload["cookies"] = cookies
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req = urllib.request.Request(
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config.flaresolverr_url,
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data=json.dumps(payload).encode("utf-8"),
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headers={"Content-Type": "application/json"},
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method="POST",
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)
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try:
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LOG.info(f"Trying to solve Cloudflare challenge for '{request.url}' this may take a while...")
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with urllib.request.urlopen(req, timeout=float(config.flaresolverr_client_timeout)) as resp:
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result = json.loads(resp.read().decode("utf-8"))
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except Exception as e:
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LOG.error(f"FlareSolverr failed to solve challenge for '{request.url}': {e!s}")
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return None
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if "ok" != result.get("status"):
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LOG.error(f"FlareSolverr failed to solve challenge for '{request.url}': {result}")
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return None
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LOG.info(f"Successfully solved Cloudflare challenge for '{request.url}'.")
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solution = result.get("solution") or {}
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_cookiejar_from_solution(solution.get("cookies"), request, handler)
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ua = solution.get("userAgent")
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if ua:
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request.headers["User-Agent"] = ua
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return request
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def set_cf_handler(solver: SolverFn | None = None) -> type[CFSolverRH]:
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"""
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Set the Cloudflare handler.
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Args:
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solver (SolverFn | None): The solver function to use for Cloudflare challenges.
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If None, the existing solver will be used.
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Returns:
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type[CloudflareRH]: The Cloudflare request handler class.
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"""
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CFSolverRH.solver = solver or CFSolverRH.solver
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return CFSolverRH
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def _cookiejar_from_solution(cookies, request: Request, handler: RequestHandler) -> None:
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cookiejar = handler._get_cookiejar(request)
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host = urlparse(request.url).hostname or ""
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for cookie in cookies or []:
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name = cookie.get("name")
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value = cookie.get("value")
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if not name or value is None:
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continue
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domain = cookie.get("domain") or host
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path = cookie.get("path") or "/"
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cookiejar.set_cookie(
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http.cookiejar.Cookie(
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version=0,
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name=name,
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value=value,
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port=None,
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port_specified=False,
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domain=domain,
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domain_specified=True,
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domain_initial_dot=domain.startswith("."),
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path=path,
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path_specified=True,
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secure=bool(cookie.get("secure")),
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expires=cookie.get("expires"),
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discard=False,
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comment=None,
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comment_url=None,
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rest={},
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rfc2109=False,
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)
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)
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@register_preference()
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def _prefer_cf_handler(handler: RequestHandler, _request: Request) -> int:
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"""Prefer Cloudflare handler when configured with endpoint."""
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from app.library.config import Config
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if not Config.get_instance().flaresolverr_url:
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return 0
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hand = getattr(handler, "RH_KEY", "")
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return 1000 if hand == "CFSolver" else 0
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@register_rh
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class CFSolverRH(RequestHandler):
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"""Request handler that intercepts Cloudflare challenges"""
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_SUPPORTED_URL_SCHEMES = ("http", "https")
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_SUPPORTED_PROXY_SCHEMES = ("http", "https", "socks4", "socks4a", "socks5", "socks5h")
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solver: ClassVar[SolverFn | None] = None
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def __init__(self, *, solver: SolverFn | None = None, **kwargs) -> None:
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super().__init__(**kwargs)
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self._solver: SolverFn | None = solver or cf_solver
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self._fallback_director: RequestDirector | None = None
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def close(self) -> None:
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if self._fallback_director:
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self._fallback_director.close()
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self._fallback_director = None
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def _check_extensions(self, extensions) -> None:
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super()._check_extensions(extensions)
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for key in ("cookiejar", "timeout", "legacy_ssl", "keep_header_casing", "impersonate", "cf_retry"):
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extensions.pop(key, None)
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def _build_fallback(self) -> RequestDirector:
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if self._fallback_director:
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return self._fallback_director
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director = RequestDirector(logger=self._logger, verbose=self.verbose)
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for handler_cls in _REQUEST_HANDLERS.values():
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if handler_cls.RH_KEY == self.RH_KEY:
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continue
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director.add_handler(
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handler_cls(
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logger=self._logger,
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headers=self.headers,
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cookiejar=self.cookiejar,
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proxies=self.proxies,
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timeout=self.timeout,
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source_address=self.source_address,
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verbose=self.verbose,
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prefer_system_certs=self.prefer_system_certs,
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client_cert=self._client_cert,
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verify=self.verify,
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legacy_ssl_support=self.legacy_ssl_support,
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)
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)
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director.preferences.update(_RH_PREFERENCES)
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self._fallback_director = director
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return director
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@staticmethod
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def _is_cf_response(response: Response) -> bool:
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"""
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Check if the response is a Cloudflare challenge response.
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Args:
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response (Response): The HTTP response to check.
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Returns:
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bool: True if the response is a Cloudflare challenge, False otherwise.
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"""
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status: int | None = getattr(response, "status", None)
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if status not in (403, 429, 503):
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return False
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headers = response.headers or {}
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server_header: str = (headers.get("Server") or "").lower()
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if "cloudflare" in server_header:
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return True
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cf_header_keys: tuple[str, ...] = ("cf-ray", "cf-chl-bypass", "cf-cache-status", "cf-visitor")
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return any(key in headers for key in cf_header_keys)
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def _solve(self, request: Request, response: Response) -> Request | None:
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return self._solver(request, response, self) if self._solver else None
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@staticmethod
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def _mark_retry(request: Request) -> Request:
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new_request: Request = request.copy()
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new_request.extensions["cf_retry"] = True
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return new_request
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def _retry_with_clearance(self, request: Request, response: Response, director: RequestDirector) -> Response:
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if request.extensions.get("cf_retry"):
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return response
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solved_request: Request | None = self._solve(self._mark_retry(request), response)
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if solved_request is None:
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return response
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solved_request.extensions.pop("cf_retry", None)
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clean_headers(solved_request.headers)
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response.close()
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return director.send(solved_request)
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def _send(self, request: Request) -> Response:
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director: RequestDirector = self._build_fallback()
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try:
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response: Response = director.send(request)
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except HTTPError as error:
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if error.response and self._is_cf_response(error.response):
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return self._retry_with_clearance(request, error.response, director)
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raise
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if self._is_cf_response(response):
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return self._retry_with_clearance(request, response, director)
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return response
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