Move remaining code out of netdisco to eliminate as SSDP dependency (#51588)

.coveragerc

@@ -973,6 +973,7 @@ omit =
     homeassistant/components/squeezebox/__init__.py
     homeassistant/components/squeezebox/browse_media.py
     homeassistant/components/squeezebox/media_player.py
+    homeassistant/components/ssdp/util.py
     homeassistant/components/starline/*
     homeassistant/components/starlingbank/sensor.py
     homeassistant/components/steam_online/sensor.py

homeassistant/components/ssdp/descriptions.py

@@ -6,10 +6,11 @@ import logging
 
 import aiohttp
 from defusedxml import ElementTree
-from netdisco import util
 
 from homeassistant.core import HomeAssistant, callback
 
+from .util import etree_to_dict
+
 _LOGGER = logging.getLogger(__name__)
 
 
@@ -64,7 +65,5 @@ class DescriptionManager:
             _LOGGER.debug("Error parsing %s: %s", xml_location, err)
             return None
 
-        parsed: dict[str, str] = (
-            util.etree_to_dict(tree).get("root", {}).get("device", {})
-        )
-        return parsed
+        root = etree_to_dict(tree).get("root") or {}
+        return root.get("device") or {}

homeassistant/components/ssdp/util.py

@@ -0,0 +1,42 @@
+"""Util functions used by SSDP."""
+from __future__ import annotations
+
+from collections import defaultdict
+from typing import Any
+
+from defusedxml import ElementTree
+
+
+# Adapted from http://stackoverflow.com/a/10077069
+# to follow the XML to JSON spec
+# https://www.xml.com/pub/a/2006/05/31/converting-between-xml-and-json.html
+def etree_to_dict(tree: ElementTree) -> dict[str, dict[str, Any] | None]:
+    """Convert an ETree object to a dict."""
+    # strip namespace
+    tag_name = tree.tag[tree.tag.find("}") + 1 :]
+
+    tree_dict: dict[str, dict[str, Any] | None] = {
+        tag_name: {} if tree.attrib else None
+    }
+    children = list(tree)
+    if children:
+        child_dict: dict[str, list] = defaultdict(list)
+        for child in map(etree_to_dict, children):
+            for k, val in child.items():
+                child_dict[k].append(val)
+        tree_dict = {
+            tag_name: {k: v[0] if len(v) == 1 else v for k, v in child_dict.items()}
+        }
+    dict_meta = tree_dict[tag_name]
+    if tree.attrib:
+        assert dict_meta is not None
+        dict_meta.update(("@" + k, v) for k, v in tree.attrib.items())
+    if tree.text:
+        text = tree.text.strip()
+        if children or tree.attrib:
+            if text:
+                assert dict_meta is not None
+                dict_meta["#text"] = text
+        else:
+            tree_dict[tag_name] = text
+    return tree_dict