Fix Teslemetry energy-site setup crash on encrypted RSA key (#181348)

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

homeassistant/components/teslemetry/__init__.py

@@ -333,9 +333,13 @@ async def _async_get_rsa_key_pem(hass: HomeAssistant) -> bytes:
     pem: bytes | None = hass.data.get(RSA_PARENT_KEY)
     if pem is None:
         path = hass.config.path(POWERWALL_KEY_FILE)
-        await Teslemetry(
-            session=async_get_clientsession(hass), access_token=""
-        ).get_rsa_private_key(path)
+        try:
+            await Teslemetry(
+                session=async_get_clientsession(hass), access_token=""
+            ).get_rsa_private_key(path)
+        except TypeError as err:
+            # An encrypted PEM surfaces as TypeError from the cryptography loader.
+            raise ValueError("RSA private key file is encrypted") from err
         pem = await hass.async_add_executor_job(Path(path).read_bytes)
         hass.data[RSA_PARENT_KEY] = pem
     return pem

homeassistant/components/teslemetry/config_flow.py

@@ -273,7 +273,11 @@ class EnergySiteSubentryFlowHandler(ConfigSubentryFlow):
             session=async_get_clientsession(self.hass), access_token=""
         )
         try:
-            await keyholder.get_rsa_private_key(path)
+            try:
+                await keyholder.get_rsa_private_key(path)
+            except TypeError as err:
+                # An encrypted PEM surfaces as TypeError from the cryptography loader.
+                raise ValueError("RSA private key file is encrypted") from err
             self._key_pem = await self.hass.async_add_executor_job(
                 Path(path).read_bytes
             )

tests/components/teslemetry/test_config_flow.py

@@ -1378,6 +1378,12 @@ async def test_pair_step_second_lookup_errors(
             ValueError,
             id="key_read_valueerror",
         ),
+        # An encrypted key PEM surfaces as TypeError from the cryptography loader.
+        pytest.param(
+            "homeassistant.components.teslemetry.config_flow.Teslemetry.get_rsa_private_key",
+            TypeError,
+            id="key_fetch_typeerror",
+        ),
     ],
 )
 async def test_rsa_key_load_failure_aborts(

tests/components/teslemetry/test_init.py

@@ -1418,6 +1418,65 @@ async def test_local_control_failure_falls_back_to_cloud(
     )
 
 
+async def test_local_control_encrypted_key_falls_back_to_cloud(
+    hass: HomeAssistant,
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """Fall back to cloud control when RSA key loading reports an encrypted PEM."""
+    entry = _entry_with_powerwall()
+    entry.add_to_hass(hass)
+
+    with (
+        patch(
+            "homeassistant.components.teslemetry.Teslemetry.get_rsa_private_key",
+            side_effect=TypeError(
+                "Password was not given but private key is encrypted"
+            ),
+        ),
+        patch("homeassistant.components.teslemetry.PLATFORMS", []),
+        caplog.at_level(logging.WARNING),
+    ):
+        await hass.config_entries.async_setup(entry.entry_id)
+        await hass.async_block_till_done()
+
+    assert entry.state is ConfigEntryState.LOADED
+    energysite = entry.runtime_data.energysites[0]
+    assert isinstance(energysite.api, EnergySite)
+    assert not isinstance(energysite.api, EnergySiteRouter)
+    assert energysite.can_local_control
+    assert "falling back to cloud control" in caplog.text
+
+
+async def test_local_control_unexpected_typeerror_is_not_swallowed(
+    hass: HomeAssistant,
+) -> None:
+    """A TypeError outside the key load is a real bug and must not degrade silently.
+
+    ``_LOCAL_CONTROL_ERRORS`` deliberately excludes TypeError: only the key
+    loader's encrypted-PEM TypeError is converted to ValueError. A TypeError
+    from anywhere else in the resolve path (here, client construction) must
+    fail setup rather than silently falling back to cloud control.
+    """
+    entry = _entry_with_powerwall()
+    entry.add_to_hass(hass)
+
+    with (
+        patch(
+            "homeassistant.components.teslemetry._async_get_rsa_key_pem",
+            return_value=_TEST_RSA_KEY_PEM,
+        ),
+        patch(
+            "homeassistant.components.teslemetry.PowerwallClient",
+            side_effect=TypeError("unexpected argument"),
+        ),
+        patch("homeassistant.components.teslemetry.PLATFORMS", []),
+    ):
+        await hass.config_entries.async_setup(entry.entry_id)
+        await hass.async_block_till_done()
+
+    assert entry.state is ConfigEntryState.SETUP_ERROR
+
+
 async def test_get_rsa_key_pem_generates_and_caches(hass: HomeAssistant) -> None:
     """The RSA key is generated/read once, then served from the hass.data cache."""
     with (