selfprivacy-rest-api/selfprivacy_api/repositories/tokens/redis_tokens_repository.py

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"""
Token repository using Redis as backend.
"""
from typing import Optional
from datetime import datetime
from selfprivacy_api.repositories.tokens.abstract_tokens_repository import (
AbstractTokensRepository,
)
from selfprivacy_api.utils.redis_pool import RedisPool
from selfprivacy_api.models.tokens.token import Token
from selfprivacy_api.models.tokens.recovery_key import RecoveryKey
from selfprivacy_api.models.tokens.new_device_key import NewDeviceKey
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from selfprivacy_api.repositories.tokens.exceptions import TokenNotFound
TOKENS_PREFIX = "token_repo:tokens:"
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NEW_DEVICE_KEY_REDIS_KEY = "token_repo:new_device_key"
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RECOVERY_KEY_REDIS_KEY = "token_repo:recovery_key"
class RedisTokensRepository(AbstractTokensRepository):
"""
Token repository using Redis as a backend
"""
def __init__(self):
self.connection = RedisPool().get_connection()
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@staticmethod
def token_key_for_device(device_name: str):
return TOKENS_PREFIX + str(hash(device_name))
def get_tokens(self) -> list[Token]:
"""Get the tokens"""
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r = self.connection
token_keys = r.keys(TOKENS_PREFIX + "*")
return [self._token_from_hash(key) for key in token_keys]
def delete_token(self, input_token: Token) -> None:
"""Delete the token"""
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r = self.connection
key = RedisTokensRepository._token_redis_key(input_token)
if input_token not in self.get_tokens():
raise TokenNotFound
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r.delete(key)
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def reset(self):
for token in self.get_tokens():
self.delete_token(token)
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self.delete_new_device_key()
r = self.connection
r.delete(RECOVERY_KEY_REDIS_KEY)
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def get_recovery_key(self) -> Optional[RecoveryKey]:
"""Get the recovery key"""
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r = self.connection
if r.exists(RECOVERY_KEY_REDIS_KEY):
return self._recovery_key_from_hash(RECOVERY_KEY_REDIS_KEY)
return None
def create_recovery_key(
self,
expiration: Optional[datetime],
uses_left: Optional[int],
) -> RecoveryKey:
"""Create the recovery key"""
recovery_key = RecoveryKey.generate(expiration=expiration, uses_left=uses_left)
self._store_model_as_hash(RECOVERY_KEY_REDIS_KEY, recovery_key)
return recovery_key
def get_new_device_key(self) -> NewDeviceKey:
"""Creates and returns the new device key"""
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new_device_key = NewDeviceKey.generate()
self._store_model_as_hash(NEW_DEVICE_KEY_REDIS_KEY, new_device_key)
return new_device_key
def delete_new_device_key(self) -> None:
"""Delete the new device key"""
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r = self.connection
r.delete(NEW_DEVICE_KEY_REDIS_KEY)
@staticmethod
def _token_redis_key(token: Token) -> str:
return RedisTokensRepository.token_key_for_device(token.device_name)
def _store_token(self, new_token: Token):
"""Store a token directly"""
key = RedisTokensRepository._token_redis_key(new_token)
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self._store_model_as_hash(key, new_token)
def _decrement_recovery_token(self):
"""Decrement recovery key use count by one"""
if self.is_recovery_key_valid():
uses_left = self.get_recovery_key().uses_left
if uses_left is not None:
r = self.connection
r.hset(RECOVERY_KEY_REDIS_KEY, "uses_left", uses_left - 1)
def _get_stored_new_device_key(self) -> Optional[NewDeviceKey]:
"""Retrieves new device key that is already stored."""
return self._new_device_key_from_hash(NEW_DEVICE_KEY_REDIS_KEY)
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@staticmethod
def _is_date_key(key: str):
return key in [
"created_at",
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"expires_at",
]
@staticmethod
def _prepare_model_dict(d: dict):
date_keys = [key for key in d.keys() if RedisTokensRepository._is_date_key(key)]
for date in date_keys:
if d[date] != "None":
d[date] = datetime.fromisoformat(d[date])
for key in d.keys():
if d[key] == "None":
d[key] = None
def _model_dict_from_hash(self, redis_key: str) -> Optional[dict]:
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r = self.connection
if r.exists(redis_key):
token_dict = r.hgetall(redis_key)
RedisTokensRepository._prepare_model_dict(token_dict)
return token_dict
return None
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def _hash_as_model(self, redis_key: str, model_class):
token_dict = self._model_dict_from_hash(redis_key)
if token_dict is not None:
return model_class(**token_dict)
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return None
def _token_from_hash(self, redis_key: str) -> Optional[Token]:
return self._hash_as_model(redis_key, Token)
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def _recovery_key_from_hash(self, redis_key: str) -> Optional[RecoveryKey]:
return self._hash_as_model(redis_key, RecoveryKey)
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def _new_device_key_from_hash(self, redis_key: str) -> Optional[NewDeviceKey]:
return self._hash_as_model(redis_key, NewDeviceKey)
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def _store_model_as_hash(self, redis_key, model):
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r = self.connection
for key, value in model.dict().items():
if isinstance(value, datetime):
value = value.isoformat()
r.hset(redis_key, key, str(value))