Fix config_flow error from dlna_dmr for UPnP discovery info containin…

…g a single service (home-assistant#69977)

homeassistant/components/dlna_dmr/config_flow.py

@@ -134,10 +134,16 @@ async def async_step_ssdp(self, discovery_info: ssdp.SsdpServiceInfo) -> FlowRes
         discovery_service_list = discovery_info.upnp.get(ssdp.ATTR_UPNP_SERVICE_LIST)
         if not discovery_service_list:
             return self.async_abort(reason="not_dmr")
-        discovery_service_ids = {
-            service.get("serviceId")
-            for service in discovery_service_list.get("service") or []
-        }
+
+        services = discovery_service_list.get("service")
+        if not services:
+            discovery_service_ids: set[str] = set()
+        elif isinstance(services, list):
+            discovery_service_ids = {service.get("serviceId") for service in services}
+        else:
+            # Only one service defined (etree_to_dict failed to make a list)
+            discovery_service_ids = {services.get("serviceId")}
+
         if not DmrDevice.SERVICE_IDS.issubset(discovery_service_ids):
             return self.async_abort(reason="not_dmr")
 

tests/components/dlna_dmr/test_config_flow.py

@@ -388,7 +388,7 @@ async def test_ssdp_flow_upnp_udn(
 
 async def test_ssdp_missing_services(hass: HomeAssistant) -> None:
     """Test SSDP ignores devices that are missing required services."""
-    # No services defined at all
+    # No service list at all
     discovery = dataclasses.replace(MOCK_DISCOVERY)
     discovery.upnp = discovery.upnp.copy()
     del discovery.upnp[ssdp.ATTR_UPNP_SERVICE_LIST]
@@ -400,6 +400,18 @@ async def test_ssdp_missing_services(hass: HomeAssistant) -> None:
     assert result["type"] == data_entry_flow.RESULT_TYPE_ABORT
     assert result["reason"] == "not_dmr"
 
+    # Service list does not contain services
+    discovery = dataclasses.replace(MOCK_DISCOVERY)
+    discovery.upnp = discovery.upnp.copy()
+    discovery.upnp[ssdp.ATTR_UPNP_SERVICE_LIST] = {"bad_key": "bad_value"}
+    result = await hass.config_entries.flow.async_init(
+        DLNA_DOMAIN,
+        context={"source": config_entries.SOURCE_SSDP},
+        data=discovery,
+    )
+    assert result["type"] == data_entry_flow.RESULT_TYPE_ABORT
+    assert result["reason"] == "not_dmr"
+
     # AVTransport service is missing
     discovery = dataclasses.replace(MOCK_DISCOVERY)
     discovery.upnp = discovery.upnp.copy()
@@ -417,6 +429,28 @@ async def test_ssdp_missing_services(hass: HomeAssistant) -> None:
     assert result["reason"] == "not_dmr"
 
 
+async def test_ssdp_single_service(hass: HomeAssistant) -> None:
+    """Test SSDP discovery info with only one service defined.
+
+    THe etree_to_dict function turns multiple services into a list of dicts, but
+    a single service into only a dict.
+    """
+    discovery = dataclasses.replace(MOCK_DISCOVERY)
+    discovery.upnp = discovery.upnp.copy()
+    service_list = discovery.upnp[ssdp.ATTR_UPNP_SERVICE_LIST].copy()
+    # Turn mock's list of service dicts into a single dict
+    service_list["service"] = service_list["service"][0]
+    discovery.upnp[ssdp.ATTR_UPNP_SERVICE_LIST] = service_list
+
+    result = await hass.config_entries.flow.async_init(
+        DLNA_DOMAIN,
+        context={"source": config_entries.SOURCE_SSDP},
+        data=discovery,
+    )
+    assert result["type"] == data_entry_flow.RESULT_TYPE_ABORT
+    assert result["reason"] == "not_dmr"
+
+
 async def test_ssdp_ignore_device(hass: HomeAssistant) -> None:
     """Test SSDP discovery ignores certain devices."""
     discovery = dataclasses.replace(MOCK_DISCOVERY)