Add diagnostics support to Tailscale (#64649)

homeassistant/components/tailscale/diagnostics.py

@@ -0,0 +1,37 @@
+"""Diagnostics support for Tailscale."""
+from __future__ import annotations
+
+import json
+from typing import Any
+
+from homeassistant.components.diagnostics import async_redact_data
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import CONF_API_KEY
+from homeassistant.core import HomeAssistant
+
+from .const import CONF_TAILNET, DOMAIN
+from .coordinator import TailscaleDataUpdateCoordinator
+
+TO_REDACT = {
+    CONF_API_KEY,
+    CONF_TAILNET,
+    "addresses",
+    "device_id",
+    "endpoints",
+    "hostname",
+    "machine_key",
+    "name",
+    "node_key",
+    "user",
+    "user",
+}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    coordinator: TailscaleDataUpdateCoordinator = hass.data[DOMAIN][entry.entry_id]
+    # Round-trip via JSON to trigger serialization
+    devices = [json.loads(device.json()) for device in coordinator.data.values()]
+    return async_redact_data({"devices": devices}, TO_REDACT)