Add support for discovery via DHCP (#45087)

* Add support for discovery via DHCP

* additional tesla ouis

* merge tests

* dhcp test

* merge requirements test

* dhcp test

* dhcp discovery

* dhcp discovery

* pylint

* pylint

* pylint

* fix

* Add matching tests

* 100% cover

* cleanup

* fix codespell

* Update exception handling

* remove unneeded comment

* fix options handling exception

* fix options handling exception

script/hassfest/dhcp.py

@@ -0,0 +1,63 @@
+"""Generate dhcp file."""
+import json
+from typing import Dict, List
+
+from .model import Config, Integration
+
+BASE = """
+\"\"\"Automatically generated by hassfest.
+
+To update, run python3 -m script.hassfest
+\"\"\"
+
+# fmt: off
+
+DHCP = {}
+""".strip()
+
+
+def generate_and_validate(integrations: List[Dict[str, str]]):
+    """Validate and generate dhcp data."""
+    match_list = []
+
+    for domain in sorted(integrations):
+        integration = integrations[domain]
+
+        if not integration.manifest:
+            continue
+
+        match_types = integration.manifest.get("dhcp", [])
+
+        if not match_types:
+            continue
+
+        for entry in match_types:
+            match_list.append({"domain": domain, **entry})
+
+    return BASE.format(json.dumps(match_list, indent=4))
+
+
+def validate(integrations: Dict[str, Integration], config: Config):
+    """Validate dhcp file."""
+    dhcp_path = config.root / "homeassistant/generated/dhcp.py"
+    config.cache["dhcp"] = content = generate_and_validate(integrations)
+
+    if config.specific_integrations:
+        return
+
+    with open(str(dhcp_path)) as fp:
+        current = fp.read().strip()
+        if current != content:
+            config.add_error(
+                "dhcp",
+                "File dhcp.py is not up to date. Run python3 -m script.hassfest",
+                fixable=True,
+            )
+        return
+
+
+def generate(integrations: Dict[str, Integration], config: Config):
+    """Generate dhcp file."""
+    dhcp_path = config.root / "homeassistant/generated/dhcp.py"
+    with open(str(dhcp_path), "w") as fp:
+        fp.write(f"{config.cache['dhcp']}\n")