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GNU GENERAL PUBLIC LICENSE
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the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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# Codeforces Tool. Reborn.
This is a *minimally* working clone of [cf-tool](https://github.com/xalanq/cf-tool), written in Python.
Only C++ templates are supported, it's ugly, but it works.
# How to run
```sh
git clone https://github.com/wzrayyy/cftool-reborn
cd cftool-reborn
python3 -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt
```
You can now run it with `python3 ./main.py`, or add a helper script `cf` to your `PATH`.
Run `cf config` to set your login details or configure a template.
# TODO
- [ ] error handling
- [ ] pretty colors
- [ ] custom tests
- [ ] methods below
```python
clone_parser = subparsers.add_parser('clone', help = "Clone a contest locally.")
open_parser = subparsers.add_parser('open', help = "Open a problem in the browser.")
pull_parser = subparsers.add_parser('pull', help = "Fetch submissions from Codeforces.")
race_parser = subparsers.add_parser('race', help = "Set up a virtual contest.")
sid_parser = subparsers.add_parser('sid', help = "Use default web browser to open the submission page.")
stand_parser = subparsers.add_parser('stand', help = "Show the contest standings.")
watch_parser = subparsers.add_parser('watch', help = "Watch the first 10 submissions of current contest")
```

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#!/bin/sh
BASEDIR="$(dirname "$(readlink -e "$0")")"
"$BASEDIR/.venv/bin/python3" "$BASEDIR/main.py" "$@"

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{"contest":2062,"tests":{"a":[["5\n1\n000\n1001\n10101\n01100101011101","1\n0\n2\n3\n8"]],"b":[["5\n2\n4 10\n2\n2 2\n3\n4 10 5\n3\n5 3 5\n5\n12 13 25 17 30","YES\nNO\nNO\nYES\nYES"]],"c":[["5\n1\n-1000\n2\n5 -3\n2\n1000 1\n9\n9 7 9 -9 9 -8 7 -8 9\n11\n678 201 340 444 453 922 128 987 127 752 0","-1000\n8\n1001\n2056\n269891"]],"d":[["6\n4\n0 11\n6 6\n0 0\n5 5\n2 1\n3 1\n4 3\n7\n1 1\n0 5\n0 5\n2 2\n2 2\n2 2\n2 2\n1 2\n1 3\n2 4\n2 5\n3 6\n3 7\n4\n1 1\n1 1\n1 1\n0 0\n1 4\n2 4\n3 4\n7\n0 20\n0 20\n0 20\n0 20\n3 3\n4 4\n5 5\n1 2\n1 3\n1 4\n2 5\n3 6\n4 7\n5\n1000000000 1000000000\n0 0\n1000000000 1000000000\n0 0\n1000000000 1000000000\n3 2\n2 1\n1 4\n4 5\n6\n21 88\n57 81\n98 99\n61 76\n15 50\n23 67\n2 1\n3 2\n4 3\n5 3\n6 4","11\n3\n3\n5\n3000000000\n98"]],"e1":[["5\n4\n2 2 4 3\n1 2\n1 3\n2 4\n5\n1 2 3 4 5\n1 2\n2 3\n3 4\n4 5\n3\n1 2 3\n1 2\n1 3\n5\n3 1 3 4 5\n1 2\n2 3\n3 4\n4 5\n10\n1 2 3 2 4 3 3 4 4 3\n1 4\n4 6\n7 4\n6 9\n6 5\n7 8\n1 2\n2 3\n2 10","2\n0\n2\n2\n10"]],"e2":[["5\n4\n2 2 4 3\n1 2\n1 3\n2 4\n5\n1 2 3 4 5\n1 2\n2 3\n3 4\n4 5\n3\n1 2 3\n1 2\n1 3\n5\n3 1 3 4 5\n1 2\n2 3\n3 4\n4 5\n10\n1 2 3 2 4 3 3 4 4 3\n1 4\n4 6\n7 4\n6 9\n6 5\n7 8\n1 2\n2 3\n2 10","2 2 4\n0\n1 2\n1 2\n5 3 4 6 7 10"]],"f":[["3\n3\n0 2\n2 1\n3 3\n5\n2 7\n7 5\n6 3\n1 8\n7 5\n8\n899167687 609615846\n851467150 45726720\n931502759 23784096\n918190644 196992738\n142090421 475722765\n409556751 726971942\n513558832 998277529\n294328304 434714258","4 9 \n10 22 34 46 \n770051069 1655330585 2931719265 3918741472 5033924854 6425541981 7934325514"]],"g":[["4\n2\n2 1\n2 1\n3\n1 2 3\n3 2 1\n4\n2 1 4 3\n4 2 3 1\n5\n1 4 3 2 5\n5 2 3 4 1","0\n1\n1 3\n3\n1 4\n2 4\n1 3\n4\n1 2\n4 5\n2 5\n1 4"]],"h":[["8\n1\n0\n2\n01\n10\n3\n010\n000\n101\n4\n0110\n1001\n1001\n0110\n11\n11111110111\n10000010010\n10111010011\n10111010011\n10111010001\n10000010000\n11111110101\n00000000111\n11011010011\n10010101100\n11101010100\n11\n11011111110\n10010000010\n00010111010\n10010111010\n01010111010\n11010000010\n01011111110\n11000000000\n01010000010\n01000111100\n00000001010\n11\n11010101001\n11001010100\n00000000110\n11111110010\n10000010010\n10111010110\n10111010111\n10111010010\n10000010110\n11111110100\n00000000000\n3\n111\n100\n111","0\n4\n9\n355\n593092633\n438667113\n922743932\n155"]]}}

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import asyncio
import re
import sys
from typing import Union
import aiohttp
from bs4 import BeautifulSoup
from .helpers import SB, random_string
from .types import Language
class CodeforcesClient:
def __init__(self, cookies: dict[str, str], csrf_token: str, ftaa: str, user_agent: str):
self.cookies = cookies
self.user_agent = user_agent
self._csrf_token = csrf_token
self._ftaa = ftaa
async def __aenter__(self):
self._session = aiohttp.ClientSession()
self._session.cookie_jar.update_cookies(self.cookies)
self._session.headers['User-Agent'] = self.user_agent
return self
async def __aexit__(self, *_):
await self.close()
@staticmethod
def auth(username: str, password: str): # TODO: error checking
with SB() as sb:
sb.uc_open_with_reconnect("https://codeforces.com/enter", 2)
sb.uc_gui_click_captcha()
sb.click('a[href="/enter?back=%2F"]')
sb.type("#handleOrEmail", username)
sb.type("#password", password)
sb.click("#remember")
sb.click('input[type="submit"]')
sb.wait_for_element("#jGrowl")
cookies = sb.get_cookies()
user_agent = sb.get_user_agent()
source = sb.get_page_source()
match = re.findall(r'<meta name="X-Csrf-Token" content="([a-f0-9]+)">', source)
assert match
csrf = match[0]
match = re.findall(r'window._ftaa = "(\w+)";', source)
assert match
ftaa = match[0]
cookies = {cookie['name']: cookie['value'] for cookie in cookies}
return CodeforcesClient(cookies, csrf, ftaa, user_agent)
@staticmethod
def find_error(body: str) -> Union[str, None]:
r = re.compile(r'error[a-zA-Z_\-\ ]*">(.*?)</span>')
m = re.findall(r, body)
return m[0] if m else None
async def submit(self, code: str, contest: int, task: str, lang: Language): # TODO: error checking
r = await self._session.post(f"https://codeforces.com/contest/{contest}/submit?csrf_token={self._csrf_token}", data = {
"csrf_token": self._csrf_token,
"ftaa": self._ftaa,
"bfaa": random_string(32, '[a-f0-9]'),
"action": "submitSolutionFormSubmitted",
"submittedProblemIndex": task, # TODO: idx saving
"programTypeId": lang.value,
"source": code,
"tabSize": "4",
"sourceFile": "",
"_tta": "239",
})
err = self.find_error(await r.text())
if err:
print(err, file=sys.stderr)
async def parse_tests(self, contest: int, tasks: list[str]):
futures = [self._session.get(f"https://codeforces.com/contest/{contest}/problem/{task}") for task in tasks]
requests = await asyncio.gather(*futures)
for idx, r in enumerate(requests):
soup = BeautifulSoup(await r.text(), 'html.parser')
test = soup.select_one('div.sample-test')
assert test
# funny line haha
inputs = ['\n'.join([el.text for el in input.select('div.test-example-line')] or [input.text]).strip() for input in test.select('div.input > pre')]
outputs = ['\n'.join([el.text for el in output.select('div.test-example-line')] or [output.text]).strip() for output in test.select('div.output > pre')]
yield {tasks[idx].lower(): [*zip(inputs, outputs)]}
async def parse_tasks(self, contest: int):
r = await self._session.get(f"https://codeforces.com/contest/{contest}")
soup = BeautifulSoup(await r.text(), 'html.parser')
table = soup.select_one('table.problems')
assert table
elements = table.select('tr')[1:]
out = []
for item in elements:
status = None
if 'class' in item.attrs:
status = item.attrs['class'][0]
inner_items = item.select('td')
assert inner_items
name_and_constraints = inner_items[1].select('div > div')
id = inner_items[0].text.strip()
out.append({
'id': id,
'name': name_and_constraints[0].text.strip(),
'status': status,
'constraints': [*name_and_constraints[1]][2].text.strip(),
})
return out
def to_dict(self):
return {
'ftaa': self._ftaa,
'cookies': self.cookies,
'user_agent': self.user_agent,
'csrf_token': self._csrf_token
}
async def close(self):
await self._session.close()

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import random
from contextlib import _GeneratorContextManager
from seleniumbase import BaseCase, SB as _SB
def random_string(n: int, format = '[a-zA-Z0-9]') -> str:
format = format[1:-1]
chars = ''
for i in range(0, len(format), 3):
for j in range(ord(format[i]), ord(format[i+2]) + 1):
chars += chr(j)
return ''.join(random.choice(chars) for _ in range(n))
# make seleniumbase somewhat typed
def SB() -> _GeneratorContextManager[BaseCase]:
return _SB(uc = True)

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from enum import Enum, auto
import time
import threading
class Spinner:
class State(Enum):
LOADING = auto()
SUCCESS = '✓'
FAILURE = '⨯'
def __init__(self, text: str):
self.text = text
self.state = self.State.LOADING
def __enter__(self):
t = threading.Thread(target = self._thread_fn)
t.start()
self.thread = t
return self
def __exit__(self, *_):
if self.state == self.State.LOADING:
self.state = self.State.SUCCESS
if self.thread:
self.thread.join()
def fail(self):
if self.thread:
self.state = self.State.FAILURE
self.thread.join()
self.thread = None
def done(self):
if self.thread:
self.state = self.State.SUCCESS
self.thread.join()
self.thread = None
def _thread_fn(self):
interval = 80
spinner = ["⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"]
i = 0
while self.state == self.State.LOADING:
i = (i + 1) % len(spinner)
print(f"\r{spinner[i]} {self.text}", end=' ')
time.sleep(interval / 1000)
print(f"\r{self.state.value} {self.text}")

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from enum import Enum
class Language(Enum):
CPP = 89
PYTHON = 31
UNKNOWN = 0
@staticmethod
def from_ext(s: str):
if s == 'py':
return Language.PYTHON
return Language.CPP

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import json
import sys
from getpass import getpass
from codeforces.client.client import CodeforcesClient
from codeforces.client.spinner import Spinner
from codeforces.ui.utils import CONFIG_FILE, SESSION_FILE, get_int
def add_login_data():
login = input("Login: ")
password = getpass("Password: ")
with Spinner("Logging in (this may take a long time)..."):
c = CodeforcesClient.auth(login, password)
with open(SESSION_FILE, 'w') as f:
json.dump({
'login': login,
'password': password,
'session': c.to_dict()
}, f)
def add_template():
template_path = input('Path to the template file (i.e. ~/algo_template.cpp): ')
try:
with open(template_path) as f:
template = f.read()
with open(CONFIG_FILE) as f:
config = json.load(f)
config.update({'template': template})
with open(CONFIG_FILE, 'w') as f:
json.dump(config, f)
except Exception:
print("Invalid path!", file=sys.stderr)
return add_template()
print("Added successfuly!", end='\n\n')
def config_menu():
print('CFTool-Reborn configuration menu. Press <C-c> to exit.', end='\n\n')
options = [
'1) Add/Update login data',
'2) Add a template'
]
try:
while True:
ans = get_int(options)
if ans == 0:
return
elif ans == 1:
add_login_data()
elif ans == 2:
add_template()
except KeyboardInterrupt:
return

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import os
import sys
from pathlib import Path
CONFIG_FILE = Path(os.path.join(os.environ['XDG_CONFIG_HOME'] if 'XDG_CONFIG_HOME' in os.environ else f"{os.environ['HOME']}/.config", 'codeforces', 'config.json'))
SESSION_FILE = Path(os.path.join(os.environ['XDG_STATE_HOME'] if 'XDG_STATE_HOME' in os.environ else f"{os.environ['HOME']}/.local/state", 'codeforces', 'session.json'))
def get_int(options: list[str]) -> int:
while True:
try:
print('\n'.join(options))
num = int(input("Enter a number: "))
assert num <= len(options)
assert num >= 0
return num
except Exception:
print("Invalid input!\n", file=sys.stderr)

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import argparse
import asyncio
import json
import os
import subprocess
import sys
from tabulate import tabulate
from codeforces.client.client import CodeforcesClient
from codeforces.client.spinner import Spinner
from codeforces.client.types import Language
from codeforces.ui.config import config_menu
from codeforces.ui.utils import CONFIG_FILE, SESSION_FILE
async def parse(client: CodeforcesClient, contest_id: int):
with Spinner('Fetching task list...'):
tasks = [task['id'] for task in await client.parse_tasks(contest_id)]
tests = {}
text = lambda: f"Pulling tests ({len(tests)}/{len(tasks)})"
with Spinner(text()) as sp:
async for test in client.parse_tests(contest_id, tasks):
tests.update(test)
sp.text = text()
with open("./.cf.json", 'w') as f:
json.dump({'contest': contest_id, 'tests': tests}, f, separators=(',', ':'))
async def submit(client: CodeforcesClient, filename: str):
with open('./.cf.json') as f:
data = json.load(f)
with open(filename) as f:
fn = filename.split('.')
await client.submit(f.read(), data['contest'], fn[0], Language.from_ext(fn[-1]))
async def list_tasks(client: CodeforcesClient):
with open("./.cf.json") as f:
contest_id = json.load(f)['contest']
tasks = await client.parse_tasks(contest_id)
headers = [*tasks[0].keys()]
t2 = [[*t.values()] for t in tasks]
print(tabulate(t2, headers))
def generate(task: str):
filename = task + '.cpp'
with open(CONFIG_FILE) as f:
config = json.load(f)
template = '' if 'template' not in config else config['template']
if os.path.isfile(filename):
print('File already exists!', file=sys.stderr)
return
with open(task + '.cpp', 'w') as f:
f.write(template)
async def test(filename: str):
with open('./.cf.json') as f:
data = json.load(f)
task_name = filename.split('.')[0].lower()
tests = data['tests'][task_name]
with Spinner("Compiling...") as sp:
ps = subprocess.Popen(f'g++ -Wall -Wextra -Wconversion -static -fno-stack-limit -O2 -std=c++20 -fdiagnostics-color=always -o {task_name} ./{filename}'.split(),
stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
ret = ps.wait()
if ret != 0:
sp.fail()
assert ps.stdout
print(ps.stdout.read().decode("utf-8"), file=sys.stderr)
exit(ret)
try:
for test in tests:
test[0] += '\n'
ps = subprocess.Popen(f"./{task_name}", stdin=subprocess.PIPE, stdout=subprocess.PIPE)
assert ps.stdin
ps.stdin.write(test[0].encode('utf-8'))
ps.stdin.flush()
ps.wait()
assert ps.stdout
output = ps.stdout.read()
is_ok = output.decode('utf-8').strip() == test[1]
print("Success" if is_ok else output)
finally:
os.remove(task_name)
async def eval_args(client: CodeforcesClient, args: argparse.Namespace):
try:
if args.action == 'parse':
await parse(client, args.contest_id)
elif args.action == 'submit':
await submit(client, args.filename)
elif args.action == 'test':
await test(args.filename)
elif args.action == 'list':
await list_tasks(client)
except Exception:
raise # TODO: exceptions for 403
await eval_args(client, args)
async def main():
CONFIG_FILE.parent.mkdir(exist_ok=True, parents=True)
if not os.path.isfile(CONFIG_FILE):
with open(CONFIG_FILE, 'w') as f:
f.write("{}")
SESSION_FILE.parent.mkdir(exist_ok=True, parents=True)
parser = argparse.ArgumentParser('cf')
subparsers = parser.add_subparsers(required = True, dest = 'action')
subparsers.add_parser('list', help = "List problems from a contest.")
subparsers.add_parser('config', help = "Configure the cf-tool.")
parse_parser = subparsers.add_parser('parse', help = "Parse and download problem statements.")
parse_parser.add_argument('contest_id', type = int)
gen_parser = subparsers.add_parser('gen', help = "Generate a template for a problem.")
gen_parser.add_argument('task')
submit_parser = subparsers.add_parser('submit', help = "Submit a solution to Codeforces.")
submit_parser.add_argument('filename')
test_parser = subparsers.add_parser('test', help = "Run local tests on a solution.")
test_parser.add_argument('filename')
args = parser.parse_args()
if args.action == 'config':
config_menu()
return
elif args.action == 'gen':
generate(args.task)
return
if not os.path.isfile(SESSION_FILE):
print('Missing session file! Run "cf config" first', file=sys.stderr)
exit(1)
with open(SESSION_FILE) as f:
auth_data = json.load(f)
if 'session' in auth_data:
session = auth_data['session']
client = CodeforcesClient(session['cookies'], session['csrf_token'], session['ftaa'], session['user_agent'])
else:
client = CodeforcesClient.auth(auth_data['login'], auth_data['password'])
with open(SESSION_FILE, 'w') as file:
auth_data.update({
'session': client.to_dict()
})
json.dump(auth_data, file)
async with client:
await eval_args(client, args)
if __name__ == "__main__":
loop = asyncio.new_event_loop()
loop.run_until_complete(main())

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[tool.pyright]
pythonVersion = "3.9"

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requirements.txt Normal file
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seleniumbase==4.34.4
beautifulsoup4==4.12.3
PyAutoGUI==0.9.54
aiohttp==3.11.11
tabulate==0.9.0