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

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from abc import ABC, abstractmethod
from datetime import datetime
from typing import Optional
from mnemonic import Mnemonic
from secrets import randbelow
import re
from selfprivacy_api.models.tokens.token import Token
from selfprivacy_api.repositories.tokens.exceptions import (
TokenNotFound,
InvalidMnemonic,
RecoveryKeyNotFound,
NewDeviceKeyNotFound,
)
from selfprivacy_api.models.tokens.recovery_key import RecoveryKey
from selfprivacy_api.models.tokens.new_device_key import NewDeviceKey
class AbstractTokensRepository(ABC):
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def get_token_by_token_string(self, token_string: str) -> Token:
"""Get the token by token"""
tokens = self.get_tokens()
for token in tokens:
if token.token == token_string:
return token
raise TokenNotFound("Token not found!")
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def get_token_by_name(self, token_name: str) -> Token:
"""Get the token by name"""
tokens = self.get_tokens()
for token in tokens:
if token.device_name == token_name:
return token
raise TokenNotFound("Token not found!")
@abstractmethod
def get_tokens(self) -> list[Token]:
"""Get the tokens"""
def create_token(self, device_name: str) -> Token:
"""Create new token"""
unique_name = self._make_unique_device_name(device_name)
new_token = Token.generate(unique_name)
self._store_token(new_token)
return new_token
@abstractmethod
def delete_token(self, input_token: Token) -> None:
"""Delete the token"""
def refresh_token(self, input_token: Token) -> Token:
"""Change the token field of the existing token"""
new_token = Token.generate(device_name=input_token.device_name)
new_token.created_at = input_token.created_at
if input_token in self.get_tokens():
self.delete_token(input_token)
self._store_token(new_token)
return new_token
raise TokenNotFound("Token not found!")
def is_token_valid(self, token_string: str) -> bool:
"""Check if the token is valid"""
return token_string in [token.token for token in self.get_tokens()]
def is_token_name_exists(self, token_name: str) -> bool:
"""Check if the token name exists"""
return token_name in [token.device_name for token in self.get_tokens()]
def is_token_name_pair_valid(self, token_name: str, token_string: str) -> bool:
"""Check if the token name and token are valid"""
try:
token = self.get_token_by_name(token_name)
if token is None:
return False
except TokenNotFound:
return False
return token.token == token_string
@abstractmethod
def get_recovery_key(self) -> Optional[RecoveryKey]:
"""Get the recovery key"""
@abstractmethod
def create_recovery_key(
self,
expiration: Optional[datetime],
uses_left: Optional[int],
) -> RecoveryKey:
"""Create the recovery key"""
def use_mnemonic_recovery_key(
self, mnemonic_phrase: str, device_name: str
) -> Token:
"""Use the mnemonic recovery key and create a new token with the given name"""
if not self.is_recovery_key_valid():
raise RecoveryKeyNotFound("Recovery key not found")
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recovery_key = self.get_recovery_key()
if recovery_key is None:
raise RecoveryKeyNotFound("Recovery key not found")
recovery_hex_key = recovery_key.key
if not self._assert_mnemonic(recovery_hex_key, mnemonic_phrase):
raise RecoveryKeyNotFound("Recovery key not found")
new_token = self.create_token(device_name=device_name)
self._decrement_recovery_token()
return new_token
def is_recovery_key_valid(self) -> bool:
"""Check if the recovery key is valid"""
recovery_key = self.get_recovery_key()
if recovery_key is None:
return False
return recovery_key.is_valid()
def get_new_device_key(self) -> NewDeviceKey:
"""Creates and returns the new device key"""
new_device_key = NewDeviceKey.generate()
self._store_new_device_key(new_device_key)
return new_device_key
def _store_new_device_key(self, new_device_key: NewDeviceKey) -> None:
"""Store new device key directly"""
@abstractmethod
def delete_new_device_key(self) -> None:
"""Delete the new device key"""
def use_mnemonic_new_device_key(
self, mnemonic_phrase: str, device_name: str
) -> Token:
"""Use the mnemonic new device key"""
new_device_key = self._get_stored_new_device_key()
if not new_device_key:
raise NewDeviceKeyNotFound
if not new_device_key.is_valid():
raise NewDeviceKeyNotFound
if not self._assert_mnemonic(new_device_key.key, mnemonic_phrase):
raise NewDeviceKeyNotFound("Phrase is not token!")
new_token = self.create_token(device_name=device_name)
self.delete_new_device_key()
return new_token
@abstractmethod
def _store_token(self, new_token: Token):
"""Store a token directly"""
@abstractmethod
def _decrement_recovery_token(self):
"""Decrement recovery key use count by one"""
@abstractmethod
def _get_stored_new_device_key(self) -> Optional[NewDeviceKey]:
"""Retrieves new device key that is already stored."""
def _make_unique_device_name(self, name: str) -> str:
"""Token name must be an alphanumeric string and not empty.
Replace invalid characters with '_'
If name exists, add a random number to the end of the name until it is unique.
"""
if not re.match("^[a-zA-Z0-9]*$", name):
name = re.sub("[^a-zA-Z0-9]", "_", name)
if name == "":
name = "Unknown device"
while self.is_token_name_exists(name):
name += str(randbelow(10))
return name
# TODO: find a proper place for it
def _assert_mnemonic(self, hex_key: str, mnemonic_phrase: str):
"""Return true if hex string matches the phrase, false otherwise
Raise an InvalidMnemonic error if not mnemonic"""
recovery_token = bytes.fromhex(hex_key)
if not Mnemonic(language="english").check(mnemonic_phrase):
raise InvalidMnemonic("Phrase is not mnemonic!")
phrase_bytes = Mnemonic(language="english").to_entropy(mnemonic_phrase)
return phrase_bytes == recovery_token