Refactor VPN proxy client implementation

src/server/features/state/stateService.ts

@@ -0,0 +1,60 @@
+import {
+  createStateSnapshot,
+  normalizeStoredState,
+  type GatewayAutoState,
+  type OperationState,
+  type StateSnapshot,
+  type StoredState,
+} from '../../../shared/contracts/state.js';
+
+interface RuntimeState {
+  running?: boolean;
+  startedAt?: string | null;
+}
+
+export interface StateReadResult {
+  snapshot: StateSnapshot;
+  storedState: StoredState;
+  gatewayAuto: GatewayAutoState;
+  configExists: boolean;
+}
+
+interface StateServiceDependencies {
+  appMode: string;
+  readStoredState: () => unknown;
+  refreshRuntime: () => Promise<RuntimeState>;
+  getGatewayAutoState: () => GatewayAutoState;
+  getOperationState: () => OperationState;
+  configExists: () => boolean;
+}
+
+function subscriptionHost(value: unknown) {
+  try {
+    return `${new URL(String(value)).host}/…`;
+  } catch {
+    return '';
+  }
+}
+
+export function createStateService(dependencies: StateServiceDependencies) {
+  return {
+    async read(): Promise<StateReadResult> {
+      const runtime = await dependencies.refreshRuntime();
+      const storedState = normalizeStoredState(dependencies.readStoredState());
+      const gatewayAuto = dependencies.getGatewayAutoState();
+      const configExists = dependencies.configExists();
+      const snapshot = createStateSnapshot({
+        storedState,
+        runtime,
+        gatewayAuto,
+        appMode: dependencies.appMode,
+        configExists,
+        subscriptionHost: subscriptionHost(storedState.subscriptionUrl),
+        operation: dependencies.getOperationState(),
+      });
+      return { snapshot, storedState, gatewayAuto, configExists };
+    },
+  };
+}
+
+export type StateService = ReturnType<typeof createStateService>;