58 lines
1.5 KiB
Python
58 lines
1.5 KiB
Python
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from __future__ import annotations
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import logging
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import secrets
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import time
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logger = logging.getLogger(__name__)
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CODE_CHARS = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789"
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CODE_LENGTH = 6
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CODE_TTL_SECONDS = 600
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MAX_PENDING = 3
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REQUEST_COOLDOWN_S = 3600
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class ILinkPairing:
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def __init__(self):
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self._pending: dict[str, dict] = {}
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self._paired: dict[str, float] = {}
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self._last_request: dict[str, float] = {}
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def generate_code(self, user_id: str) -> str | None:
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now = time.time()
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last = self._last_request.get(user_id, 0)
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if now - last < REQUEST_COOLDOWN_S:
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return None
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if len(self._pending) >= MAX_PENDING:
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return None
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code = "".join(secrets.choice(CODE_CHARS) for _ in range(CODE_LENGTH))
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self._pending[user_id] = {"code": code, "created_at": now}
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self._last_request[user_id] = now
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return code
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def verify(self, user_id: str, code: str) -> bool:
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entry = self._pending.get(user_id)
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if not entry:
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return False
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if time.time() - entry["created_at"] > CODE_TTL_SECONDS:
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del self._pending[user_id]
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return False
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if entry["code"] == code.upper().strip():
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del self._pending[user_id]
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self._paired[user_id] = time.time()
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return True
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return False
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def is_paired(self, user_id: str) -> bool:
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return user_id in self._paired
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def revoke(self, user_id: str) -> None:
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self._paired.pop(user_id, None)
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self._pending.pop(user_id, None)
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