Allow serializing and passing of credentials_hashes in DeviceConfig (#607)

* Allow passing of credentials_hashes in DeviceConfig

* Update following review

kasa/aestransport.py

@@ -16,6 +16,7 @@ from cryptography.hazmat.primitives.asymmetric import padding as asymmetric_padd
 from cryptography.hazmat.primitives.asymmetric import rsa
 from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
 
+from .credentials import Credentials
 from .deviceconfig import DeviceConfig
 from .exceptions import (
     SMART_AUTHENTICATION_ERRORS,
@@ -62,6 +63,16 @@ class AesTransport(BaseTransport):
     ) -> None:
         super().__init__(config=config)
 
+        self._login_version = config.connection_type.login_version
+        if not self._credentials and not self._credentials_hash:
+            self._credentials = Credentials()
+        if self._credentials:
+            self._login_params = self._get_login_params()
+        else:
+            self._login_params = json_loads(
+                base64.b64decode(self._credentials_hash.encode()).decode()  # type: ignore[union-attr]
+            )
+
         self._default_http_client: Optional[httpx.AsyncClient] = None
 
         self._handshake_done = False
@@ -80,6 +91,11 @@ class AesTransport(BaseTransport):
         """Default port for the transport."""
         return self.DEFAULT_PORT
 
+    @property
+    def credentials_hash(self) -> str:
+        """The hashed credentials used by the transport."""
+        return base64.b64encode(json_dumps(self._login_params).encode()).decode()
+
     @property
     def _http_client(self) -> httpx.AsyncClient:
         if self._config.http_client:
@@ -88,6 +104,12 @@ class AesTransport(BaseTransport):
             self._default_http_client = httpx.AsyncClient()
         return self._default_http_client
 
+    def _get_login_params(self):
+        """Get the login parameters based on the login_version."""
+        un, pw = self.hash_credentials(self._login_version == 2)
+        password_field_name = "password2" if self._login_version == 2 else "password"
+        return {password_field_name: pw, "username": un}
+
     def hash_credentials(self, login_v2):
         """Hash the credentials."""
         if login_v2:
@@ -171,14 +193,12 @@ class AesTransport(BaseTransport):
         resp_dict = json_loads(response)
         return resp_dict
 
-    async def _perform_login_for_version(self, *, login_version: int = 1):
+    async def perform_login(self):
         """Login to the device."""
         self._login_token = None
-        un, pw = self.hash_credentials(login_version == 2)
-        password_field_name = "password2" if login_version == 2 else "password"
         login_request = {
             "method": "login_device",
-            "params": {password_field_name: pw, "username": un},
+            "params": self._login_params,
             "request_time_milis": round(time.time() * 1000),
         }
         request = json_dumps(login_request)
@@ -187,15 +207,6 @@ class AesTransport(BaseTransport):
         self._handle_response_error_code(resp_dict, "Error logging in")
         self._login_token = resp_dict["result"]["token"]
 
-    async def perform_login(self) -> None:
-        """Login to the device."""
-        try:
-            await self._perform_login_for_version(login_version=2)
-        except AuthenticationException:
-            _LOGGER.warning("Login version 2 failed, trying version 1")
-            await self.perform_handshake()
-            await self._perform_login_for_version(login_version=1)
-
     async def perform_handshake(self):
         """Perform the handshake."""
         _LOGGER.debug("Will perform handshaking...")

kasa/cli.py

@@ -184,6 +184,12 @@ def json_formatter_cb(result, **kwargs):
     default=None,
     type=click.Choice(DEVICE_FAMILY_TYPES, case_sensitive=False),
 )
+@click.option(
+    "--login-version",
+    envvar="KASA_LOGIN_VERSION",
+    default=None,
+    type=int,
+)
 @click.option(
     "--timeout",
     envvar="KASA_TIMEOUT",
@@ -214,6 +220,13 @@ def json_formatter_cb(result, **kwargs):
     envvar="KASA_PASSWORD",
     help="Password to use to authenticate to device.",
 )
+@click.option(
+    "--credentials-hash",
+    default=None,
+    required=False,
+    envvar="KASA_CREDENTIALS_HASH",
+    help="Hashed credentials used to authenticate to the device.",
+)
 @click.version_option(package_name="python-kasa")
 @click.pass_context
 async def cli(
@@ -227,11 +240,13 @@ async def cli(
     type,
     encrypt_type,
     device_family,
+    login_version,
     json,
     timeout,
     discovery_timeout,
     username,
     password,
+    credentials_hash,
 ):
     """A tool for controlling TP-Link smart home devices."""  # noqa
     # no need to perform any checks if we are just displaying the help
@@ -291,7 +306,10 @@ async def cli(
             "username", "Using authentication requires both --username and --password"
         )
 
+    if username:
         credentials = Credentials(username=username, password=password)
+    else:
+        credentials = None
 
     if host is None:
         echo("No host name given, trying discovery..")
@@ -300,13 +318,18 @@ async def cli(
     if type is not None:
         dev = TYPE_TO_CLASS[type](host)
         await dev.update()
-    elif device_family or encrypt_type:
+    elif device_family and encrypt_type:
         ctype = ConnectionType(
             DeviceFamilyType(device_family),
             EncryptType(encrypt_type),
+            login_version,
         )
         config = DeviceConfig(
-            host=host, credentials=credentials, timeout=timeout, connection_type=ctype
+            host=host,
+            credentials=credentials,
+            credentials_hash=credentials_hash,
+            timeout=timeout,
+            connection_type=ctype,
         )
         dev = await SmartDevice.connect(config=config)
     else:
@@ -495,6 +518,7 @@ async def state(dev: SmartDevice):
     echo(f"[bold]== {dev.alias} - {dev.model} ==[/bold]")
     echo(f"\tHost: {dev.host}")
     echo(f"\tPort: {dev.port}")
+    echo(f"\tCredentials hash: {dev.credentials_hash}")
     echo(f"\tDevice state: {dev.is_on}")
     if dev.is_strip:
         echo("\t[bold]== Plugs ==[/bold]")

kasa/deviceconfig.py

@@ -2,7 +2,7 @@
 import logging
 from dataclasses import asdict, dataclass, field, fields, is_dataclass
 from enum import Enum
-from typing import Dict, Optional
+from typing import Dict, Optional, Union
 
 import httpx
 
@@ -69,21 +69,25 @@ class ConnectionType:
 
     device_family: DeviceFamilyType
     encryption_type: EncryptType
+    login_version: Optional[int] = None
 
     @staticmethod
     def from_values(
         device_family: str,
         encryption_type: str,
+        login_version: Optional[int] = None,
     ) -> "ConnectionType":
         """Return connection parameters from string values."""
         try:
             return ConnectionType(
                 DeviceFamilyType(device_family),
                 EncryptType(encryption_type),
+                login_version,
             )
-        except ValueError as ex:
+        except (ValueError, TypeError) as ex:
             raise SmartDeviceException(
-                f"Invalid connection parameters for {device_family}.{encryption_type}"
+                f"Invalid connection parameters for {device_family}."
+                + f"{encryption_type}.{login_version}"
             ) from ex
 
     @staticmethod
@@ -94,18 +98,26 @@ class ConnectionType:
             and (device_family := connection_type_dict.get("device_family"))
             and (encryption_type := connection_type_dict.get("encryption_type"))
         ):
-            return ConnectionType.from_values(device_family, encryption_type)
+            if login_version := connection_type_dict.get("login_version"):
+                login_version = int(login_version)  # type: ignore[assignment]
+            return ConnectionType.from_values(
+                device_family,
+                encryption_type,
+                login_version,  # type: ignore[arg-type]
+            )
 
         raise SmartDeviceException(
             f"Invalid connection type data for {connection_type_dict}"
         )
 
-    def to_dict(self) -> Dict[str, str]:
+    def to_dict(self) -> Dict[str, Union[str, int]]:
         """Convert connection params to dict."""
-        result = {
+        result: Dict[str, Union[str, int]] = {
             "device_family": self.device_family.value,
             "encryption_type": self.encryption_type.value,
         }
+        if self.login_version:
+            result["login_version"] = self.login_version
         return result
 
 
@@ -118,10 +130,11 @@ class DeviceConfig:
     host: str
     timeout: Optional[int] = DEFAULT_TIMEOUT
     port_override: Optional[int] = None
-    credentials: Credentials = field(default_factory=lambda: Credentials())
+    credentials: Optional[Credentials] = None
+    credentials_hash: Optional[str] = None
     connection_type: ConnectionType = field(
         default_factory=lambda: ConnectionType(
-            DeviceFamilyType.IotSmartPlugSwitch, EncryptType.Xor
+            DeviceFamilyType.IotSmartPlugSwitch, EncryptType.Xor, 1
         )
     )
 
@@ -130,15 +143,22 @@ class DeviceConfig:
     http_client: Optional[httpx.AsyncClient] = field(default=None, compare=False)
 
     def __post_init__(self):
-        if self.credentials is None:
-            self.credentials = Credentials()
         if self.connection_type is None:
             self.connection_type = ConnectionType(
                 DeviceFamilyType.IotSmartPlugSwitch, EncryptType.Xor
             )
 
-    def to_dict(self) -> Dict[str, Dict[str, str]]:
+    def to_dict(
+        self,
+        *,
+        credentials_hash: Optional[str] = None,
+        exclude_credentials: bool = False,
+    ) -> Dict[str, Dict[str, str]]:
         """Convert connection params to dict."""
+        if credentials_hash or exclude_credentials:
+            self.credentials = None
+        if credentials_hash:
+            self.credentials_hash = credentials_hash
         return _dataclass_to_dict(self)
 
     @staticmethod

kasa/discover.py

@@ -422,7 +422,9 @@ class Discover:
 
         try:
             config.connection_type = ConnectionType.from_values(
-                type_, discovery_result.mgt_encrypt_schm.encrypt_type
+                type_,
+                discovery_result.mgt_encrypt_schm.encrypt_type,
+                discovery_result.mgt_encrypt_schm.lv,
             )
         except SmartDeviceException as ex:
             raise UnsupportedDeviceException(

kasa/klaptransport.py

@@ -41,6 +41,7 @@ https://github.com/python-kasa/python-kasa/pull/117
 """
 
 import asyncio
+import base64
 import datetime
 import hashlib
 import logging
@@ -99,8 +100,13 @@ class KlapTransport(BaseTransport):
 
         self._default_http_client: Optional[httpx.AsyncClient] = None
         self._local_seed: Optional[bytes] = None
+        if not self._credentials and not self._credentials_hash:
+            self._credentials = Credentials()
+        if self._credentials:
             self._local_auth_hash = self.generate_auth_hash(self._credentials)
             self._local_auth_owner = self.generate_owner_hash(self._credentials).hex()
+        else:
+            self._local_auth_hash = base64.b64decode(self._credentials_hash.encode())  # type: ignore[union-attr]
         self._kasa_setup_auth_hash = None
         self._blank_auth_hash = None
         self._handshake_lock = asyncio.Lock()
@@ -119,6 +125,11 @@ class KlapTransport(BaseTransport):
         """Default port for the transport."""
         return self.DEFAULT_PORT
 
+    @property
+    def credentials_hash(self) -> str:
+        """The hashed credentials used by the transport."""
+        return base64.b64encode(self._local_auth_hash).decode()
+
     @property
     def _http_client(self) -> httpx.AsyncClient:
         if self._config.http_client:

kasa/protocol.py

@@ -56,6 +56,7 @@ class BaseTransport(ABC):
         self._host = config.host
         self._port = config.port_override or self.default_port
         self._credentials = config.credentials
+        self._credentials_hash = config.credentials_hash
         self._timeout = config.timeout
 
     @property
@@ -63,6 +64,11 @@ class BaseTransport(ABC):
     def default_port(self) -> int:
         """The default port for the transport."""
 
+    @property
+    @abstractmethod
+    def credentials_hash(self) -> str:
+        """The hashed credentials used by the transport."""
+
     @abstractmethod
     async def send(self, request: str) -> Dict:
         """Send a message to the device and return a response."""
@@ -120,6 +126,11 @@ class _XorTransport(BaseTransport):
         """Default port for the transport."""
         return self.DEFAULT_PORT
 
+    @property
+    def credentials_hash(self) -> str:
+        """The hashed credentials used by the transport."""
+        return ""
+
     async def send(self, request: str) -> Dict:
         """Send a message to the device and return a response."""
         return {}

kasa/smartdevice.py

@@ -245,6 +245,11 @@ class SmartDevice:
         """The device credentials."""
         return self.protocol._transport._credentials
 
+    @property
+    def credentials_hash(self) -> Optional[str]:
+        """Return the connection parameters the device is using."""
+        return self.protocol._transport.credentials_hash
+
     def add_module(self, name: str, module: Module):
         """Register a module."""
         if name in self.modules:

kasa/tapo/tapodevice.py

@@ -38,8 +38,8 @@ class TapoDevice(SmartDevice):
 
     async def update(self, update_children: bool = True):
         """Update the device."""
-        if self.credentials is None:
+        if self.credentials is None and self.credentials_hash is None:
-            raise AuthenticationException("Device requires authentication.")
+            raise AuthenticationException("Tapo plug requires authentication.")
 
         if self._components_raw is None:
             resp = await self.protocol.query("component_nego")

kasa/tests/conftest.py

@@ -430,6 +430,7 @@ def discovery_mock(all_fixture_data, mocker):
         query_data: dict
         device_type: str
         encrypt_type: str
+        login_version: Optional[int] = None
         port_override: Optional[int] = None
 
     if "discovery_result" in all_fixture_data:
@@ -438,6 +439,9 @@ def discovery_mock(all_fixture_data, mocker):
         encrypt_type = all_fixture_data["discovery_result"]["mgt_encrypt_schm"][
             "encrypt_type"
         ]
+        login_version = all_fixture_data["discovery_result"]["mgt_encrypt_schm"].get(
+            "lv"
+        )
         datagram = (
             b"\x02\x00\x00\x01\x01[\x00\x00\x00\x00\x00\x00W\xcev\xf8"
             + json_dumps(discovery_data).encode()
@@ -450,12 +454,14 @@ def discovery_mock(all_fixture_data, mocker):
             all_fixture_data,
             device_type,
             encrypt_type,
+            login_version,
         )
     else:
         sys_info = all_fixture_data["system"]["get_sysinfo"]
         discovery_data = {"system": {"get_sysinfo": sys_info}}
         device_type = sys_info.get("mic_type") or sys_info.get("type")
         encrypt_type = "XOR"
+        login_version = None
         datagram = TPLinkSmartHomeProtocol.encrypt(json_dumps(discovery_data))[4:]
         dm = _DiscoveryMock(
             "127.0.0.123",
@@ -465,6 +471,7 @@ def discovery_mock(all_fixture_data, mocker):
             all_fixture_data,
             device_type,
             encrypt_type,
+            login_version,
         )
 
     def mock_discover(self):

kasa/tests/newfakes.py

@@ -1,3 +1,4 @@
+import base64
 import copy
 import logging
 import re
@@ -320,6 +321,11 @@ class FakeSmartTransport(BaseTransport):
         """Default port for the transport."""
         return 80
 
+    @property
+    def credentials_hash(self):
+        """The hashed credentials used by the transport."""
+        return self._credentials.username + self._credentials.password + "hash"
+
     async def send(self, request: str):
         request_dict = json_loads(request)
         method = request_dict["method"]

kasa/tests/test_deviceconfig.py

@@ -19,3 +19,30 @@ def test_serialization():
     config2_dict = json_loads(config_json)
     config2 = DeviceConfig.from_dict(config2_dict)
     assert config == config2
+
+
+def test_credentials_hash():
+    config = DeviceConfig(
+        host="Foo",
+        http_client=httpx.AsyncClient(),
+        credentials=Credentials("foo", "bar"),
+    )
+    config_dict = config.to_dict(credentials_hash="credhash")
+    config_json = json_dumps(config_dict)
+    config2_dict = json_loads(config_json)
+    config2 = DeviceConfig.from_dict(config2_dict)
+    assert config2.credentials_hash == "credhash"
+    assert config2.credentials is None
+
+
+def test_no_credentials_serialization():
+    config = DeviceConfig(
+        host="Foo",
+        http_client=httpx.AsyncClient(),
+        credentials=Credentials("foo", "bar"),
+    )
+    config_dict = config.to_dict(exclude_credentials=True)
+    config_json = json_dumps(config_dict)
+    config2_dict = json_loads(config_json)
+    config2 = DeviceConfig.from_dict(config2_dict)
+    assert config2.credentials is None

kasa/tests/test_discovery.py

@@ -110,11 +110,17 @@ async def test_discover_single(discovery_mock, custom_port, mocker):
     assert update_mock.call_count == 0
 
     ct = ConnectionType.from_values(
-        discovery_mock.device_type, discovery_mock.encrypt_type
+        discovery_mock.device_type,
+        discovery_mock.encrypt_type,
+        discovery_mock.login_version,
     )
     uses_http = discovery_mock.default_port == 80
     config = DeviceConfig(
-        host=host, port_override=custom_port, connection_type=ct, uses_http=uses_http
+        host=host,
+        port_override=custom_port,
+        connection_type=ct,
+        uses_http=uses_http,
+        credentials=Credentials(),
     )
     assert x.config == config
 

kasa/tests/test_protocol.py

@@ -9,8 +9,11 @@ import sys
 
 import pytest
 
+from ..aestransport import AesTransport
+from ..credentials import Credentials
 from ..deviceconfig import DeviceConfig
 from ..exceptions import SmartDeviceException
+from ..klaptransport import KlapTransport, KlapTransportV2
 from ..protocol import (
     BaseTransport,
     TPLinkProtocol,
@@ -298,3 +301,19 @@ def test_transport_init_signature(class_name_obj):
     assert (
         params[1].name == "config" and params[1].kind == inspect.Parameter.KEYWORD_ONLY
     )
+
+
+@pytest.mark.parametrize(
+    "transport_class", [AesTransport, KlapTransport, KlapTransportV2, _XorTransport]
+)
+async def test_transport_credentials_hash(mocker, transport_class):
+    host = "127.0.0.1"
+
+    credentials = Credentials("Foo", "Bar")
+    config = DeviceConfig(host, credentials=credentials)
+    transport = transport_class(config=config)
+    credentials_hash = transport.credentials_hash
+    config = DeviceConfig(host, credentials_hash=credentials_hash)
+    transport = transport_class(config=config)
+
+    assert transport.credentials_hash == credentials_hash