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#
# Copyright 2022 aiohomekit team
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
from functools import lru_cache
from uuid import UUID
BASE_UUID = "-0000-1000-8000-0026BB765291"
@lru_cache(maxsize=1024)
def shorten_uuid(value: str) -> str:
"""
Returns the shortned version of a UUID.
This only applies to official HK services and characteristics.
"""
value = value.upper()
if value.endswith(BASE_UUID):
value = value.split("-", 1)[0]
return value.lstrip("0")
return normalize_uuid(value)
@lru_cache(maxsize=1024)
def normalize_uuid(value: str) -> str:
"""
Returns a normalized UUID.
This includes postfixing -0000-1000-8000-0026BB765291 and ensuring the case.
"""
value = value.upper()
if len(value) <= 8:
prefix = "0" * (8 - len(value))
return f"{prefix}{value}{BASE_UUID}"
if len(value) == 36:
return value
# Handle cases like 34AB8811AC7F4340BAC3FD6A85F9943B
# Reject the rest
try:
return str(UUID(value.zfill(32))).upper()
except ValueError:
raise ValueError(f"{value} doesn't look like a valid UUID or short UUID")
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