milestone 19: hygiene sweep - dead ecs surface, single-source constants, tls classification, frontend state hazards, docker smoke network fix

web/src/features/settings/SettingsPage.tsx

@@ -10,22 +10,40 @@ import { focusRing } from "@/ui/classes";
 /** True when the patch touches anything besides the write-only `web.password` (ruling 11). */
 export function patchRequiresRestart(patch: SettingsPatch): boolean {
 	return Object.entries(patch).some(([section, fields]) =>
-		Object.keys(fields as Record<string, unknown>).some((key) => !(section === "web" && key === "password")),
+		Object.keys(fields ?? {}).some((key) => !(section === "web" && key === "password")),
 	);
 }
 
-interface FieldDef {
-	key: string;
+interface FieldDef<S extends keyof Settings> {
+	key: keyof Settings[S] & string;
 	kind: "number" | "text" | "boolean" | readonly string[];
 }
 
-interface SectionDef {
-	section: keyof Settings;
+interface SectionDef<S extends keyof Settings> {
+	section: S;
 	title: string;
-	fields: readonly FieldDef[];
+	fields: readonly FieldDef<S>[];
 }
 
-const TLS_FIELDS: readonly FieldDef[] = [
+/** Binds each section's field keys to that section's Settings type at definition. */
+function defineSection<S extends keyof Settings>(def: SectionDef<S>): SectionDef<S> {
+	return def;
+}
+
+/** The registry read back as a heterogeneous list, once the per-section binding has been proven. */
+type AnyFieldDef = { [S in keyof Settings]: FieldDef<S> }[keyof Settings];
+type AnySectionDef = { [S in keyof Settings]: SectionDef<S> }[keyof Settings];
+
+/**
+ * A section's values as a string-keyed view. The keys are proven against
+ * `Settings[S]` where each section is defined; iterating the heterogeneous
+ * registry loses that correlation, so consumption widens here in one place.
+ */
+function sectionValues(settings: Settings, section: keyof Settings): Record<string, unknown> {
+	return settings[section] as Record<string, unknown>;
+}
+
+const TLS_FIELDS: readonly FieldDef<"doh_server" | "dot_server">[] = [
 	{ key: "enabled", kind: "boolean" },
 	{ key: "bind", kind: "text" },
 	{ key: "port", kind: "number" },
@@ -33,8 +51,8 @@ const TLS_FIELDS: readonly FieldDef[] = [
 	{ key: "key_path", kind: "text" },
 ];
 
-const SECTIONS: readonly SectionDef[] = [
-	{
+const SECTIONS: readonly AnySectionDef[] = [
+	defineSection({
 		section: "upstream",
 		title: "Upstream",
 		fields: [
@@ -42,8 +60,8 @@ const SECTIONS: readonly SectionDef[] = [
 			{ key: "read_timeout_ms", kind: "number" },
 			{ key: "total_timeout_ms", kind: "number" },
 		],
-	},
-	{
+	}),
+	defineSection({
 		section: "dns",
 		title: "DNS",
 		fields: [
@@ -53,24 +71,24 @@ const SECTIONS: readonly SectionDef[] = [
 			{ key: "rate_limit", kind: "number" },
 			{ key: "rate_window_seconds", kind: "number" },
 		],
-	},
-	{
+	}),
+	defineSection({
 		section: "blocking",
 		title: "Blocking",
 		fields: [
 			{ key: "response", kind: ["zero", "nxdomain"] },
 			{ key: "ttl", kind: "number" },
 		],
-	},
-	{
+	}),
+	defineSection({
 		section: "cache",
 		title: "Cache",
 		fields: [
 			{ key: "size", kind: "number" },
 			{ key: "negative_ttl_max", kind: "number" },
 		],
-	},
-	{
+	}),
+	defineSection({
 		section: "web",
 		title: "Web",
 		fields: [
@@ -83,11 +101,11 @@ const SECTIONS: readonly SectionDef[] = [
 			{ key: "sse_max_connections_per_ip", kind: "number" },
 			{ key: "trusted_proxies", kind: "text" },
 		],
-	},
-	{ section: "doh_server", title: "DoH Server", fields: TLS_FIELDS },
-	{ section: "dot_server", title: "DoT Server", fields: TLS_FIELDS },
-	{ section: "edns", title: "EDNS", fields: [{ key: "ecs_mode", kind: ["strip", "forward"] }] },
-	{
+	}),
+	defineSection({ section: "doh_server", title: "DoH Server", fields: TLS_FIELDS }),
+	defineSection({ section: "dot_server", title: "DoT Server", fields: TLS_FIELDS }),
+	defineSection({ section: "edns", title: "EDNS", fields: [{ key: "ecs_mode", kind: ["strip", "forward"] }] }),
+	defineSection({
 		section: "logging",
 		title: "Logging",
 		fields: [
@@ -101,23 +119,23 @@ const SECTIONS: readonly SectionDef[] = [
 			{ key: "max_size_mb", kind: "number" },
 			{ key: "max_files", kind: "number" },
 		],
-	},
-	{
+	}),
+	defineSection({
 		section: "disk",
 		title: "Disk",
 		fields: [
 			{ key: "min_free_mb", kind: "number" },
 			{ key: "warn_free_mb", kind: "number" },
 		],
-	},
-	{
+	}),
+	defineSection({
 		section: "blocklist_update",
 		title: "Blocklist Update",
 		fields: [
 			{ key: "enabled", kind: "boolean" },
 			{ key: "interval_hours", kind: "number" },
 		],
-	},
+	}),
 ];
 
 const LABEL_CLASS = "text-sm text-zinc-700 dark:text-zinc-300";
@@ -130,7 +148,7 @@ function FieldRow({
 	onChange,
 }: {
 	section: string;
-	def: FieldDef;
+	def: AnyFieldDef;
 	value: unknown;
 	onChange: (value: unknown) => void;
 }) {
@@ -209,23 +227,27 @@ export default function SettingsPage() {
 	const { data } = useSuspenseQuery(settingsQuery());
 	const queryClient = useQueryClient();
 	const mutation = useMutation(settingsPutMutation(queryClient));
+	// Frozen at mount and re-frozen on save: diffing against live query data would
+	// turn a background refetch's out-of-band changes into phantom user edits.
+	const [baseline, setBaseline] = useState<Settings>(() => structuredClone(data.settings));
 	const [edited, setEdited] = useState<Settings>(() => structuredClone(data.settings));
 	const [password, setPassword] = useState("");
 	const [confirm, setConfirm] = useState("");
 
 	const passwordsMismatch = (password !== "" || confirm !== "") && password !== confirm;
-	const hasInvalidNumber = SECTIONS.some(({ section, fields }) =>
-		fields.some(
-			(field) => field.kind === "number" && Number.isNaN((edited[section] as Record<string, unknown>)[field.key]),
-		),
-	);
-	const patch = buildSettingsPatch(data.settings, edited, password === "" ? undefined : password);
+	const hasInvalidNumber = SECTIONS.some(({ section, fields }) => {
+		const values = sectionValues(edited, section);
+		return (fields as readonly AnyFieldDef[]).some(
+			(field) => field.kind === "number" && Number.isNaN(values[field.key]),
+		);
+	});
+	const patch = buildSettingsPatch(baseline, edited, password === "" ? undefined : password);
 	const saveDisabled = patch === null || passwordsMismatch || hasInvalidNumber || mutation.isPending;
 
 	function setField(section: keyof Settings, key: string, value: unknown): void {
 		setEdited((prev) => ({
 			...prev,
-			[section]: { ...(prev[section] as Record<string, unknown>), [key]: value },
+			[section]: { ...sectionValues(prev, section), [key]: value },
 		}));
 	}
 
@@ -235,6 +257,7 @@ export default function SettingsPage() {
 		const restartNeeded = patchRequiresRestart(patch);
 		mutation.mutate(patch, {
 			onSuccess: (envelope) => {
+				setBaseline(structuredClone(envelope.settings));
 				setEdited(structuredClone(envelope.settings));
 				setPassword("");
 				setConfirm("");
@@ -255,12 +278,12 @@ export default function SettingsPage() {
 						<fieldset key={section} className="rounded border border-zinc-200 p-4 dark:border-zinc-800">
 							<legend className="px-1 text-sm font-semibold">{title}</legend>
 							<div className="grid gap-3 sm:grid-cols-2">
-								{fields.map((def) => (
+								{(fields as readonly AnyFieldDef[]).map((def) => (
 									<FieldRow
 										key={def.key}
 										section={section}
 										def={def}
-										value={(edited[section] as Record<string, unknown>)[def.key]}
+										value={sectionValues(edited, section)[def.key]}
 										onChange={(value) => setField(section, def.key, value)}
 									/>
 								))}