Raise UnsupportedDeviceError instead of crashing on unknown device types (#1781)

Use get() instead of index accessor to avoid crashing on unknown devices.

---------

Co-authored-by: GhostCoder6969 <ghostcoder6969@gmail.com>

kasa/device_factory.py

@@ -142,7 +142,13 @@ def get_device_class_from_sys_info(sysinfo: dict[str, Any]) -> type[IotDevice]:
         # Disabled until properly implemented
         # DeviceType.Camera: IotCamera,
     }
-    return TYPE_TO_CLASS[IotDevice._get_device_type_from_sys_info(sysinfo)]
+    device_type = IotDevice._get_device_type_from_sys_info(sysinfo)
+    if (cls := TYPE_TO_CLASS.get(device_type)) is None:
+        raise UnsupportedDeviceError(
+            f"Unsupported device type: {device_type}",
+            discovery_result=sysinfo,
+        )
+    return cls
 
 
 def get_device_class_from_family(

tests/test_device_factory.py

@@ -21,6 +21,7 @@ from kasa import (
     KasaException,
     SmartCamProtocol,
     SmartProtocol,
+    UnsupportedDeviceError,
 )
 from kasa.device_factory import (
     Device,
@@ -31,6 +32,7 @@ from kasa.device_factory import (
     SmartDevice,
     connect,
     get_device_class_from_family,
+    get_device_class_from_sys_info,
     get_protocol,
 )
 from kasa.deviceconfig import (
@@ -212,6 +214,26 @@ async def test_device_types(dev: Device) -> None:
     assert dev.device_type == res
 
 
+def test_device_class_from_unsupported_legacy_camera() -> None:
+    """IOT.IPCAMERA sysinfo raises UnsupportedDeviceError instead of KeyError."""
+    info = {
+        "system": {
+            "get_sysinfo": {
+                "system": {
+                    "type": "IOT.IPCAMERA",
+                    "model": "EC60(US)",
+                    "alias": "Kasa Cam",
+                    "dev_name": "Kasa Spot",
+                }
+            }
+        }
+    }
+    with pytest.raises(UnsupportedDeviceError, match="Unsupported device type"):
+        get_device_class_from_sys_info(info)
+    with pytest.raises(UnsupportedDeviceError, match="Unsupported device type"):
+        Discover._get_device_class(info)
+
+
 @pytest.mark.xdist_group(name="caplog")
 async def test_device_class_from_unknown_family(
     caplog: pytest.LogCaptureFixture,