selfprivacy-rest-api/selfprivacy_api/models/tokens/recovery_key.py

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"""
Recovery key used to obtain access token.
Recovery key has a token string, date of creation, optional date of expiration and optional count of uses left.
"""
from datetime import datetime, timezone
import secrets
from typing import Optional
from pydantic import BaseModel
from mnemonic import Mnemonic
from selfprivacy_api.models.tokens.time import is_past, ensure_timezone
class RecoveryKey(BaseModel):
"""
Recovery key used to obtain access token.
Recovery key has a key string, date of creation, optional date of expiration and optional count of uses left.
"""
key: str
created_at: datetime
expires_at: Optional[datetime]
uses_left: Optional[int]
def is_valid(self) -> bool:
"""
Check if the recovery key is valid.
"""
if self.expires_at is not None and is_past(self.expires_at):
return False
if self.uses_left is not None and self.uses_left <= 0:
return False
return True
def as_mnemonic(self) -> str:
"""
Get the recovery key as a mnemonic.
"""
return Mnemonic(language="english").to_mnemonic(bytes.fromhex(self.key))
@staticmethod
def generate(
expiration: Optional[datetime],
uses_left: Optional[int],
) -> "RecoveryKey":
"""
Factory to generate a random token.
If passed naive time as expiration, assumes utc
"""
creation_date = datetime.now(timezone.utc)
if expiration is not None:
expiration = ensure_timezone(expiration)
key = secrets.token_bytes(24).hex()
return RecoveryKey(
key=key,
created_at=creation_date,
expires_at=expiration,
uses_left=uses_left,
)