Barrett Ruth
84343d2045
Problem: `:CP <platform> login` short-circuited on cached cookies/tokens. If an old session was still valid, the new credentials were never tested, so the user got "login successful" even with garbage input. Solution: Always validate credentials against the platform in the login path. Remove cookie/token loading from `_login_headless` (AtCoder), `_login_headless_cf` (CF), `_login_headless_codechef` (CodeChef), and `login` (CSES). For USACO submit, replace the `_check_usaco_login` roundtrip with cookie trust + retry-on-auth-failure (the Kattis pattern). Submit paths are unchanged — cookie fast-paths remain for contest speed. Closes #331
669 lines
22 KiB
Python
669 lines
22 KiB
Python
#!/usr/bin/env python3
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import asyncio
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import json
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import os
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import re
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import subprocess
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import time
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from pathlib import Path
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from typing import Any
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import backoff
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import httpx
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import requests
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from bs4 import BeautifulSoup, Tag
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from requests.adapters import HTTPAdapter
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from urllib3.util.retry import Retry
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from .base import BaseScraper, extract_precision
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from .models import (
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ContestListResult,
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ContestSummary,
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LoginResult,
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MetadataResult,
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ProblemSummary,
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SubmitResult,
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TestCase,
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)
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from .timeouts import (
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BROWSER_ELEMENT_WAIT,
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BROWSER_NAV_TIMEOUT,
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BROWSER_SESSION_TIMEOUT,
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BROWSER_SETTLE_DELAY,
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BROWSER_SUBMIT_NAV_TIMEOUT,
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BROWSER_TURNSTILE_POLL,
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HTTP_TIMEOUT,
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)
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_LANGUAGE_ID_EXTENSION = {
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"6017": "cc",
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"6082": "py",
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}
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MIB_TO_MB = 1.048576
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BASE_URL = "https://atcoder.jp"
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ARCHIVE_URL = f"{BASE_URL}/contests/archive"
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HEADERS = {
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"User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36"
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}
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RETRY_STATUS = {429, 502, 503, 504}
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FATAL_STATUS = {400, 401, 403, 404, 410}
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_session = requests.Session()
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_adapter = HTTPAdapter(
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pool_connections=100,
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pool_maxsize=100,
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max_retries=Retry(total=0),
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)
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_session.mount("https://", _adapter)
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_session.mount("http://", _adapter)
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def _give_up_requests(exc: Exception) -> bool:
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if isinstance(exc, requests.HTTPError) and exc.response is not None:
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return exc.response.status_code in FATAL_STATUS
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return False
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def _retry_after_requests(details):
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exc = details.get("exception")
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if isinstance(exc, requests.HTTPError) and exc.response is not None:
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ra = exc.response.headers.get("Retry-After")
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if ra:
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try:
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time.sleep(max(0.0, float(ra)))
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except ValueError:
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pass
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@backoff.on_exception(
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backoff.expo,
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(requests.ConnectionError, requests.Timeout, requests.HTTPError),
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max_tries=5,
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jitter=backoff.full_jitter,
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giveup=_give_up_requests,
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on_backoff=_retry_after_requests,
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)
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def _fetch(url: str) -> str:
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r = _session.get(url, headers=HEADERS, timeout=HTTP_TIMEOUT)
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if r.status_code in RETRY_STATUS:
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raise requests.HTTPError(response=r)
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r.raise_for_status()
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return r.text
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def _giveup_httpx(exc: Exception) -> bool:
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return (
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isinstance(exc, httpx.HTTPStatusError)
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and exc.response is not None
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and (exc.response.status_code in FATAL_STATUS)
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)
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@backoff.on_exception(
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backoff.expo,
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(httpx.ConnectError, httpx.ReadTimeout, httpx.HTTPStatusError),
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max_tries=5,
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jitter=backoff.full_jitter,
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giveup=_giveup_httpx,
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)
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async def _get_async(client: httpx.AsyncClient, url: str) -> str:
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r = await client.get(url, headers=HEADERS, timeout=HTTP_TIMEOUT)
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r.raise_for_status()
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return r.text
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def _text_from_pre(pre: Tag) -> str:
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return (
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pre.get_text(separator="\n", strip=False)
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.replace("\r", "")
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.replace("\xa0", " ")
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.rstrip("\n")
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)
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def _parse_last_page(html: str) -> int:
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soup = BeautifulSoup(html, "html.parser")
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nav = soup.select_one("ul.pagination")
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if not nav:
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return 1
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nums = []
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for a in nav.select("a"):
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s = a.get_text(strip=True)
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if s.isdigit():
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nums.append(int(s))
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return max(nums) if nums else 1
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def _parse_start_time(tr: Tag) -> int | None:
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tds = tr.select("td")
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if not tds:
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return None
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time_el = tds[0].select_one("time.fixtime-full")
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if not time_el:
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return None
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text = time_el.get_text(strip=True)
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try:
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from datetime import datetime
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dt = datetime.strptime(text, "%Y-%m-%d %H:%M:%S%z")
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return int(dt.timestamp())
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except (ValueError, TypeError):
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return None
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def _parse_archive_contests(html: str) -> list[ContestSummary]:
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soup = BeautifulSoup(html, "html.parser")
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tbody = soup.select_one("table.table-default tbody") or soup.select_one("tbody")
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if not tbody:
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return []
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out: list[ContestSummary] = []
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for tr in tbody.select("tr"):
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a = tr.select_one("a[href^='/contests/']")
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if not a:
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continue
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href_attr = a.get("href")
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if not isinstance(href_attr, str):
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continue
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m = re.search(r"/contests/([^/?#]+)", href_attr)
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if not m:
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continue
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cid = m.group(1)
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name = a.get_text(strip=True)
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start_time = _parse_start_time(tr)
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out.append(
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ContestSummary(id=cid, name=name, display_name=name, start_time=start_time)
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)
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return out
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def _parse_tasks_list(html: str) -> list[dict[str, str]]:
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soup = BeautifulSoup(html, "html.parser")
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tbody = soup.select_one("table tbody")
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if not tbody:
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return []
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rows: list[dict[str, str]] = []
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for tr in tbody.select("tr"):
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tds = tr.select("td")
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if len(tds) < 2:
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continue
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letter = tds[0].get_text(strip=True)
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a = tds[1].select_one("a[href*='/tasks/']")
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if not a:
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continue
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href_attr = a.get("href")
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if not isinstance(href_attr, str):
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continue
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m = re.search(r"/contests/[^/]+/tasks/([^/?#]+)", href_attr)
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if not m:
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continue
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slug = m.group(1)
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title = a.get_text(strip=True)
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rows.append({"letter": letter, "title": title, "slug": slug})
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return rows
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def _extract_problem_info(html: str) -> tuple[int, float, bool, float | None]:
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soup = BeautifulSoup(html, "html.parser")
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txt = soup.get_text(" ", strip=True)
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timeout_ms = 0
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memory_mb = 0.0
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ts = re.search(r"Time\s*Limit:\s*([\d.]+)\s*sec", txt, flags=re.I)
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if ts:
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timeout_ms = int(float(ts.group(1)) * 1000)
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ms = re.search(r"Memory\s*Limit:\s*(\d+)\s*MiB", txt, flags=re.I)
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if ms:
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memory_mb = float(ms.group(1)) * MIB_TO_MB
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div = soup.select_one("#problem-statement")
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body = div.get_text(" ", strip=True) if div else soup.get_text(" ", strip=True)
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interactive = "This is an interactive" in body
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precision = extract_precision(body)
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return timeout_ms, memory_mb, interactive, precision
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def _extract_samples(html: str) -> list[TestCase]:
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soup = BeautifulSoup(html, "html.parser")
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root = soup.select_one("#task-statement") or soup
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inputs: dict[str, str] = {}
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outputs: dict[str, str] = {}
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for h in root.find_all(re.compile(r"h[2-4]")):
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title = h.get_text(" ", strip=True)
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pre = h.find_next("pre")
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if not pre:
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continue
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t = _text_from_pre(pre)
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mi = re.search(r"Sample\s*Input\s*(\d+)", title, flags=re.I)
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mo = re.search(r"Sample\s*Output\s*(\d+)", title, flags=re.I)
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if mi:
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inputs[mi.group(1)] = t.strip()
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elif mo:
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outputs[mo.group(1)] = t.strip()
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cases: list[TestCase] = []
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for k in sorted(set(inputs) & set(outputs), key=lambda s: int(s)):
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cases.append(TestCase(input=inputs[k], expected=outputs[k]))
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return cases
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_TURNSTILE_JS = "() => { const el = document.querySelector('[name=\"cf-turnstile-response\"]'); return el && el.value.length > 0; }"
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def _solve_turnstile(page) -> None:
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if page.evaluate(_TURNSTILE_JS):
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return
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iframe_loc = page.locator('iframe[src*="challenges.cloudflare.com"]')
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if not iframe_loc.count():
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return
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for _ in range(6):
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try:
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box = iframe_loc.first.bounding_box()
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if box:
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page.mouse.click(
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box["x"] + box["width"] * 0.15,
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box["y"] + box["height"] * 0.5,
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)
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except Exception:
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pass
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try:
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page.wait_for_function(_TURNSTILE_JS, timeout=BROWSER_TURNSTILE_POLL)
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return
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except Exception:
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pass
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raise RuntimeError("Turnstile not solved after multiple attempts")
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def _ensure_browser() -> None:
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try:
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from patchright._impl._driver import compute_driver_executable # type: ignore[import-untyped,unresolved-import]
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node, cli = compute_driver_executable()
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except Exception:
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return
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browser_info = subprocess.run(
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[node, cli, "install", "--dry-run", "chromium"],
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capture_output=True,
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text=True,
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)
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for line in browser_info.stdout.splitlines():
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if "Install location:" in line:
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install_dir = line.split(":", 1)[1].strip()
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if not os.path.isdir(install_dir):
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print(json.dumps({"status": "installing_browser"}), flush=True)
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subprocess.run([node, cli, "install", "chromium"], check=True)
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break
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def _login_headless(credentials: dict[str, str]) -> LoginResult:
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try:
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from scrapling.fetchers import StealthySession # type: ignore[import-untyped,unresolved-import]
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except ImportError:
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return LoginResult(
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success=False,
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error="scrapling is required for AtCoder login. Install it: uv add 'scrapling[fetchers]>=0.4'",
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)
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_ensure_browser()
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cookie_cache = Path.home() / ".cache" / "cp-nvim" / "atcoder-cookies.json"
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cookie_cache.parent.mkdir(parents=True, exist_ok=True)
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logged_in = False
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login_error: str | None = None
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def check_login(page):
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nonlocal logged_in
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logged_in = page.evaluate(
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"() => Array.from(document.querySelectorAll('a')).some(a => a.textContent.trim() === 'Sign Out')"
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)
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def login_action(page):
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nonlocal login_error
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try:
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_solve_turnstile(page)
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page.fill('input[name="username"]', credentials.get("username", ""))
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page.fill('input[name="password"]', credentials.get("password", ""))
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page.click("#submit")
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page.wait_for_url(
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lambda url: "/login" not in url, timeout=BROWSER_NAV_TIMEOUT
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)
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except Exception as e:
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login_error = str(e)
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try:
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with StealthySession(
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headless=True,
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timeout=BROWSER_SESSION_TIMEOUT,
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google_search=False,
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) as session:
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print(json.dumps({"status": "logging_in"}), flush=True)
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session.fetch(
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f"{BASE_URL}/login",
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page_action=login_action,
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solve_cloudflare=True,
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)
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if login_error:
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return LoginResult(
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success=False, error=f"Login failed: {login_error}"
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)
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session.fetch(
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f"{BASE_URL}/home", page_action=check_login, network_idle=True
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)
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if not logged_in:
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return LoginResult(
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success=False, error="Login failed (bad credentials?)"
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)
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try:
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browser_cookies = session.context.cookies()
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if any(c["name"] == "REVEL_SESSION" for c in browser_cookies):
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cookie_cache.write_text(json.dumps(browser_cookies))
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except Exception:
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pass
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return LoginResult(success=True, error="")
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except Exception as e:
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return LoginResult(success=False, error=str(e))
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def _submit_headless(
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contest_id: str,
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problem_id: str,
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file_path: str,
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language_id: str,
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credentials: dict[str, str],
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_retried: bool = False,
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) -> "SubmitResult":
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try:
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from scrapling.fetchers import StealthySession # type: ignore[import-untyped,unresolved-import]
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except ImportError:
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return SubmitResult(
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success=False,
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error="scrapling is required for AtCoder submit. Install it: uv add 'scrapling[fetchers]>=0.4'",
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)
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_ensure_browser()
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cookie_cache = Path.home() / ".cache" / "cp-nvim" / "atcoder-cookies.json"
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cookie_cache.parent.mkdir(parents=True, exist_ok=True)
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saved_cookies: list[dict[str, Any]] = []
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if cookie_cache.exists():
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try:
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saved_cookies = json.loads(cookie_cache.read_text())
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except Exception:
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pass
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logged_in = cookie_cache.exists() and not _retried
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login_error: str | None = None
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submit_error: str | None = None
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needs_relogin = False
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def check_login(page):
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nonlocal logged_in
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logged_in = page.evaluate(
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"() => Array.from(document.querySelectorAll('a')).some(a => a.textContent.trim() === 'Sign Out')"
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)
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|
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def login_action(page):
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nonlocal login_error
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try:
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_solve_turnstile(page)
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page.fill('input[name="username"]', credentials.get("username", ""))
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page.fill('input[name="password"]', credentials.get("password", ""))
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page.click("#submit")
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page.wait_for_url(
|
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lambda url: "/login" not in url, timeout=BROWSER_NAV_TIMEOUT
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)
|
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except Exception as e:
|
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login_error = str(e)
|
|
|
|
def submit_action(page):
|
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nonlocal submit_error, needs_relogin
|
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if "/login" in page.url:
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needs_relogin = True
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return
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try:
|
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_solve_turnstile(page)
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page.select_option(
|
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'select[name="data.TaskScreenName"]',
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f"{contest_id}_{problem_id}",
|
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)
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page.locator(
|
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f'select[name="data.LanguageId"] option[value="{language_id}"]'
|
|
).wait_for(state="attached", timeout=BROWSER_ELEMENT_WAIT)
|
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page.select_option('select[name="data.LanguageId"]', language_id)
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page.set_input_files("#input-open-file", file_path)
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page.wait_for_timeout(BROWSER_SETTLE_DELAY)
|
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page.locator('button[type="submit"]').click()
|
|
page.wait_for_url(
|
|
lambda url: "/submissions/me" in url,
|
|
timeout=BROWSER_SUBMIT_NAV_TIMEOUT["atcoder"],
|
|
)
|
|
except Exception as e:
|
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submit_error = str(e)
|
|
|
|
try:
|
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with StealthySession(
|
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headless=True,
|
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timeout=BROWSER_SESSION_TIMEOUT,
|
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google_search=False,
|
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cookies=saved_cookies if (cookie_cache.exists() and not _retried) else [],
|
|
) as session:
|
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if not (cookie_cache.exists() and not _retried):
|
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print(json.dumps({"status": "checking_login"}), flush=True)
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session.fetch(
|
|
f"{BASE_URL}/home", page_action=check_login, network_idle=True
|
|
)
|
|
|
|
if not logged_in:
|
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print(json.dumps({"status": "logging_in"}), flush=True)
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session.fetch(
|
|
f"{BASE_URL}/login",
|
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page_action=login_action,
|
|
solve_cloudflare=True,
|
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)
|
|
if login_error:
|
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return SubmitResult(
|
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success=False, error=f"Login failed: {login_error}"
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)
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|
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print(json.dumps({"status": "submitting"}), flush=True)
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session.fetch(
|
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f"{BASE_URL}/contests/{contest_id}/submit",
|
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page_action=submit_action,
|
|
solve_cloudflare=True,
|
|
)
|
|
|
|
try:
|
|
browser_cookies = session.context.cookies()
|
|
if any(c["name"] == "REVEL_SESSION" for c in browser_cookies):
|
|
cookie_cache.write_text(json.dumps(browser_cookies))
|
|
except Exception:
|
|
pass
|
|
|
|
if needs_relogin and not _retried:
|
|
cookie_cache.unlink(missing_ok=True)
|
|
return _submit_headless(
|
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contest_id,
|
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problem_id,
|
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file_path,
|
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language_id,
|
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credentials,
|
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_retried=True,
|
|
)
|
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|
|
if submit_error:
|
|
return SubmitResult(success=False, error=submit_error)
|
|
|
|
return SubmitResult(
|
|
success=True, error="", submission_id="", verdict="submitted"
|
|
)
|
|
except Exception as e:
|
|
return SubmitResult(success=False, error=str(e))
|
|
|
|
|
|
def _scrape_tasks_sync(contest_id: str) -> list[dict[str, str]]:
|
|
html = _fetch(f"{BASE_URL}/contests/{contest_id}/tasks")
|
|
return _parse_tasks_list(html)
|
|
|
|
|
|
def _scrape_problem_page_sync(contest_id: str, slug: str) -> dict[str, Any]:
|
|
html = _fetch(f"{BASE_URL}/contests/{contest_id}/tasks/{slug}")
|
|
try:
|
|
tests = _extract_samples(html)
|
|
except Exception:
|
|
tests = []
|
|
timeout_ms, memory_mb, interactive, precision = _extract_problem_info(html)
|
|
return {
|
|
"tests": tests,
|
|
"timeout_ms": timeout_ms,
|
|
"memory_mb": memory_mb,
|
|
"interactive": interactive,
|
|
"precision": precision,
|
|
}
|
|
|
|
|
|
def _to_problem_summaries(rows: list[dict[str, str]]) -> list[ProblemSummary]:
|
|
out: list[ProblemSummary] = []
|
|
for r in rows:
|
|
letter = (r.get("letter") or "").strip().upper()
|
|
title = r.get("title") or ""
|
|
if not letter:
|
|
continue
|
|
pid = letter.lower()
|
|
out.append(ProblemSummary(id=pid, name=title))
|
|
return out
|
|
|
|
|
|
async def _fetch_upcoming_contests_async(
|
|
client: httpx.AsyncClient,
|
|
) -> list[ContestSummary]:
|
|
try:
|
|
html = await _get_async(client, f"{BASE_URL}/contests/")
|
|
return _parse_archive_contests(html)
|
|
except Exception:
|
|
return []
|
|
|
|
|
|
async def _fetch_all_contests_async() -> list[ContestSummary]:
|
|
async with httpx.AsyncClient(
|
|
limits=httpx.Limits(max_connections=100, max_keepalive_connections=100),
|
|
) as client:
|
|
upcoming = await _fetch_upcoming_contests_async(client)
|
|
first_html = await _get_async(client, ARCHIVE_URL)
|
|
last = _parse_last_page(first_html)
|
|
out = _parse_archive_contests(first_html)
|
|
if last <= 1:
|
|
seen = {c.id for c in out}
|
|
for c in upcoming:
|
|
if c.id not in seen:
|
|
out.append(c)
|
|
return out
|
|
tasks = [
|
|
asyncio.create_task(_get_async(client, f"{ARCHIVE_URL}?page={p}"))
|
|
for p in range(2, last + 1)
|
|
]
|
|
for coro in asyncio.as_completed(tasks):
|
|
html = await coro
|
|
out.extend(_parse_archive_contests(html))
|
|
seen = {c.id for c in out}
|
|
for c in upcoming:
|
|
if c.id not in seen:
|
|
out.append(c)
|
|
return out
|
|
|
|
|
|
class AtcoderScraper(BaseScraper):
|
|
@property
|
|
def platform_name(self) -> str:
|
|
return "atcoder"
|
|
|
|
async def scrape_contest_metadata(self, contest_id: str) -> MetadataResult:
|
|
try:
|
|
rows = await asyncio.to_thread(_scrape_tasks_sync, contest_id)
|
|
problems = _to_problem_summaries(rows)
|
|
if not problems:
|
|
return self._metadata_error(
|
|
f"No problems found for contest {contest_id}"
|
|
)
|
|
return MetadataResult(
|
|
success=True,
|
|
error="",
|
|
contest_id=contest_id,
|
|
problems=problems,
|
|
url=f"https://atcoder.jp/contests/{contest_id}/tasks/{contest_id}_%s",
|
|
contest_url=f"https://atcoder.jp/contests/{contest_id}",
|
|
standings_url=f"https://atcoder.jp/contests/{contest_id}/standings",
|
|
)
|
|
except Exception as e:
|
|
return self._metadata_error(str(e))
|
|
|
|
async def scrape_contest_list(self) -> ContestListResult:
|
|
try:
|
|
contests = await _fetch_all_contests_async()
|
|
if not contests:
|
|
return self._contests_error("No contests found")
|
|
return ContestListResult(success=True, error="", contests=contests)
|
|
except Exception as e:
|
|
return self._contests_error(str(e))
|
|
|
|
async def stream_tests_for_category_async(self, category_id: str) -> None:
|
|
rows = await asyncio.to_thread(_scrape_tasks_sync, category_id)
|
|
|
|
async def emit(row: dict[str, str]) -> None:
|
|
letter = (row.get("letter") or "").strip().lower()
|
|
slug = row.get("slug") or ""
|
|
if not letter or not slug:
|
|
return
|
|
data = await asyncio.to_thread(_scrape_problem_page_sync, category_id, slug)
|
|
tests: list[TestCase] = data.get("tests", [])
|
|
combined_input = "\n".join(t.input for t in tests) if tests else ""
|
|
combined_expected = "\n".join(t.expected for t in tests) if tests else ""
|
|
print(
|
|
json.dumps(
|
|
{
|
|
"problem_id": letter,
|
|
"combined": {
|
|
"input": combined_input,
|
|
"expected": combined_expected,
|
|
},
|
|
"tests": [
|
|
{"input": t.input, "expected": t.expected} for t in tests
|
|
],
|
|
"timeout_ms": data.get("timeout_ms", 0),
|
|
"memory_mb": data.get("memory_mb", 0),
|
|
"interactive": bool(data.get("interactive")),
|
|
"multi_test": False,
|
|
"precision": data.get("precision"),
|
|
}
|
|
),
|
|
flush=True,
|
|
)
|
|
|
|
await asyncio.gather(*(emit(r) for r in rows))
|
|
|
|
async def submit(
|
|
self,
|
|
contest_id: str,
|
|
problem_id: str,
|
|
file_path: str,
|
|
language_id: str,
|
|
credentials: dict[str, str],
|
|
) -> SubmitResult:
|
|
return await asyncio.to_thread(
|
|
_submit_headless,
|
|
contest_id,
|
|
problem_id,
|
|
file_path,
|
|
language_id,
|
|
credentials,
|
|
)
|
|
|
|
async def login(self, credentials: dict[str, str]) -> LoginResult:
|
|
if not credentials.get("username") or not credentials.get("password"):
|
|
return self._login_error("Missing username or password")
|
|
return await asyncio.to_thread(_login_headless, credentials)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
AtcoderScraper().run_cli()
|