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148 lines
6.0 KiB
Python
148 lines
6.0 KiB
Python
# Copyright 2021-2023 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# -----------------------------------------------------------------------------
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# Imports
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# -----------------------------------------------------------------------------
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from __future__ import annotations
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import enum
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import struct
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from typing import Optional
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from bumble import gatt
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from bumble import gatt_client
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# -----------------------------------------------------------------------------
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# Constants
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# -----------------------------------------------------------------------------
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class SirkType(enum.IntEnum):
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'''Coordinated Set Identification Service - 5.1 Set Identity Resolving Key.'''
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ENCRYPTED = 0x00
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PLAINTEXT = 0x01
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class MemberLock(enum.IntEnum):
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'''Coordinated Set Identification Service - 5.3 Set Member Lock.'''
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UNLOCKED = 0x01
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LOCKED = 0x02
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# -----------------------------------------------------------------------------
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# Utils
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# -----------------------------------------------------------------------------
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# TODO: Implement RSI Generator
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# -----------------------------------------------------------------------------
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# Server
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# -----------------------------------------------------------------------------
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class CoordinatedSetIdentificationService(gatt.TemplateService):
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UUID = gatt.GATT_COORDINATED_SET_IDENTIFICATION_SERVICE
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set_identity_resolving_key_characteristic: gatt.Characteristic
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coordinated_set_size_characteristic: Optional[gatt.Characteristic] = None
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set_member_lock_characteristic: Optional[gatt.Characteristic] = None
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set_member_rank_characteristic: Optional[gatt.Characteristic] = None
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def __init__(
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self,
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set_identity_resolving_key: bytes,
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coordinated_set_size: Optional[int] = None,
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set_member_lock: Optional[MemberLock] = None,
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set_member_rank: Optional[int] = None,
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) -> None:
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characteristics = []
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self.set_identity_resolving_key_characteristic = gatt.Characteristic(
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uuid=gatt.GATT_SET_IDENTITY_RESOLVING_KEY_CHARACTERISTIC,
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properties=gatt.Characteristic.Properties.READ
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| gatt.Characteristic.Properties.NOTIFY,
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permissions=gatt.Characteristic.Permissions.READABLE,
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# TODO: Implement encrypted SIRK reader.
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value=struct.pack('B', SirkType.PLAINTEXT) + set_identity_resolving_key,
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)
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characteristics.append(self.set_identity_resolving_key_characteristic)
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if coordinated_set_size is not None:
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self.coordinated_set_size_characteristic = gatt.Characteristic(
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uuid=gatt.GATT_COORDINATED_SET_SIZE_CHARACTERISTIC,
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properties=gatt.Characteristic.Properties.READ
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| gatt.Characteristic.Properties.NOTIFY,
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permissions=gatt.Characteristic.Permissions.READABLE,
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value=struct.pack('B', coordinated_set_size),
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)
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characteristics.append(self.coordinated_set_size_characteristic)
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if set_member_lock is not None:
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self.set_member_lock_characteristic = gatt.Characteristic(
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uuid=gatt.GATT_SET_MEMBER_LOCK_CHARACTERISTIC,
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properties=gatt.Characteristic.Properties.READ
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| gatt.Characteristic.Properties.NOTIFY
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| gatt.Characteristic.Properties.WRITE,
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permissions=gatt.Characteristic.Permissions.READABLE
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| gatt.Characteristic.Permissions.WRITEABLE,
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value=struct.pack('B', set_member_lock),
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)
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characteristics.append(self.set_member_lock_characteristic)
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if set_member_rank is not None:
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self.set_member_rank_characteristic = gatt.Characteristic(
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uuid=gatt.GATT_SET_MEMBER_RANK_CHARACTERISTIC,
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properties=gatt.Characteristic.Properties.READ
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| gatt.Characteristic.Properties.NOTIFY,
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permissions=gatt.Characteristic.Permissions.READABLE,
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value=struct.pack('B', set_member_rank),
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)
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characteristics.append(self.set_member_rank_characteristic)
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super().__init__(characteristics)
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# -----------------------------------------------------------------------------
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# Client
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# -----------------------------------------------------------------------------
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class CoordinatedSetIdentificationProxy(gatt_client.ProfileServiceProxy):
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SERVICE_CLASS = CoordinatedSetIdentificationService
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set_identity_resolving_key: gatt_client.CharacteristicProxy
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coordinated_set_size: Optional[gatt_client.CharacteristicProxy] = None
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set_member_lock: Optional[gatt_client.CharacteristicProxy] = None
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set_member_rank: Optional[gatt_client.CharacteristicProxy] = None
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def __init__(self, service_proxy: gatt_client.ServiceProxy) -> None:
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self.service_proxy = service_proxy
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self.set_identity_resolving_key = service_proxy.get_characteristics_by_uuid(
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gatt.GATT_SET_IDENTITY_RESOLVING_KEY_CHARACTERISTIC
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)[0]
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if characteristics := service_proxy.get_characteristics_by_uuid(
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gatt.GATT_COORDINATED_SET_SIZE_CHARACTERISTIC
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):
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self.coordinated_set_size = characteristics[0]
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if characteristics := service_proxy.get_characteristics_by_uuid(
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gatt.GATT_SET_MEMBER_LOCK_CHARACTERISTIC
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):
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self.set_member_lock = characteristics[0]
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if characteristics := service_proxy.get_characteristics_by_uuid(
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gatt.GATT_SET_MEMBER_RANK_CHARACTERISTIC
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):
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self.set_member_rank = characteristics[0]
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