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Running on Zero
Running on Zero
| """Force-join gate. The user must be a member of EVERY channel/group in GATE_CHANNELS. | |
| The bot must be an ADMIN of each of them, otherwise Telegram will not tell it who the members are. | |
| A misconfiguration (bot not admin / wrong username) BLOCKS users and alerts the admin loudly, | |
| instead of silently letting everybody in. Temporary network trouble does not punish students.""" | |
| import asyncio | |
| import logging | |
| import time | |
| from aiogram import Bot | |
| from aiogram.enums import ChatMemberStatus | |
| from aiogram.exceptions import TelegramBadRequest, TelegramForbiddenError | |
| from app.config import get_settings | |
| from app.core.notify import notify_admins | |
| log = logging.getLogger(__name__) | |
| _OK = {ChatMemberStatus.CREATOR, ChatMemberStatus.ADMINISTRATOR, ChatMemberStatus.MEMBER} | |
| _cache: dict[int, float] = {} | |
| _alerted: dict[str, float] = {} | |
| _TTL = 1800 # seconds a positive result is trusted (/start and the "I joined" button always re-check) | |
| def channels() -> list[str]: | |
| return get_settings().gate_list | |
| def channel_url(handle: str) -> str: | |
| return f"https://t.me/{handle.lstrip('@')}" | |
| async def _alert(bot: Bot, handle: str, exc: Exception) -> None: | |
| now = time.monotonic() | |
| if now - _alerted.get(handle, 0) < 600: | |
| return | |
| _alerted[handle] = now | |
| log.error("Gate cannot verify %s: %r", handle, exc) | |
| await notify_admins( | |
| bot, | |
| f"⚠️ The join-gate cannot check {handle}: {type(exc).__name__}: {exc}\n" | |
| f"Make the bot an ADMIN of {handle} and check the username (run /gatecheck). " | |
| "Until it is fixed, users are NOT let through.", | |
| ) | |
| async def _is_in(bot: Bot, handle: str, user_id: int) -> bool: | |
| try: | |
| member = await bot.get_chat_member(handle, user_id) | |
| return member.status in _OK | |
| except (TelegramBadRequest, TelegramForbiddenError) as exc: # configuration problem -> stay closed | |
| await _alert(bot, handle, exc) | |
| return False | |
| except Exception as exc: # network hiccup / flood wait: do not punish students | |
| log.warning("Gate check for %s hit a temporary error: %r", handle, exc) | |
| return True | |
| async def missing(bot: Bot, user_id: int, *, fresh: bool = False) -> list[str]: | |
| """Channels the user still has to join (empty list = allowed in).""" | |
| now = time.time() | |
| if not fresh and _cache.get(user_id, 0) > now: | |
| return [] | |
| handles = channels() | |
| results = await asyncio.gather(*[_is_in(bot, h, user_id) for h in handles]) | |
| left = [h for h, ok in zip(handles, results) if not ok] | |
| if left: | |
| _cache.pop(user_id, None) | |
| else: | |
| _cache[user_id] = now + _TTL | |
| return left | |
| async def is_member(bot: Bot, user_id: int, *, fresh: bool = False) -> bool: | |
| return not await missing(bot, user_id, fresh=fresh) | |