feat(mosaic): mosaic telemetry command (M6 CU-06-01..05) (#417)

packages/mosaic/src/telemetry/consent-store.ts

@@ -0,0 +1,112 @@
+/**
+ * Persistent consent store for remote telemetry upload.
+ *
+ * State is stored in $MOSAIC_HOME/telemetry.json (not inside the markdown
+ * config files — those are template-rendered and would lose structured data).
+ *
+ * Schema:
+ *   {
+ *     remoteEnabled: boolean,
+ *     optedInAt:     string | null,   // ISO timestamp
+ *     optedOutAt:    string | null,   // ISO timestamp
+ *     lastUploadAt:  string | null    // ISO timestamp
+ *   }
+ */
+
+import { existsSync, readFileSync } from 'node:fs';
+import { join } from 'node:path';
+import { atomicWrite } from '../platform/file-ops.js';
+import { DEFAULT_MOSAIC_HOME } from '../constants.js';
+
+export interface TelemetryConsent {
+  remoteEnabled: boolean;
+  optedInAt: string | null;
+  optedOutAt: string | null;
+  lastUploadAt: string | null;
+}
+
+const TELEMETRY_FILE = 'telemetry.json';
+
+const DEFAULT_CONSENT: TelemetryConsent = {
+  remoteEnabled: false,
+  optedInAt: null,
+  optedOutAt: null,
+  lastUploadAt: null,
+};
+
+function consentFilePath(mosaicHome?: string): string {
+  return join(mosaicHome ?? getMosaicHome(), TELEMETRY_FILE);
+}
+
+function getMosaicHome(): string {
+  return process.env['MOSAIC_HOME'] ?? DEFAULT_MOSAIC_HOME;
+}
+
+/**
+ * Read the current consent state. Returns defaults if file doesn't exist.
+ */
+export function readConsent(mosaicHome?: string): TelemetryConsent {
+  const filePath = consentFilePath(mosaicHome);
+  if (!existsSync(filePath)) {
+    return { ...DEFAULT_CONSENT };
+  }
+  try {
+    const raw = readFileSync(filePath, 'utf-8');
+    const parsed = JSON.parse(raw) as Partial<TelemetryConsent>;
+    return {
+      remoteEnabled: parsed.remoteEnabled ?? false,
+      optedInAt: parsed.optedInAt ?? null,
+      optedOutAt: parsed.optedOutAt ?? null,
+      lastUploadAt: parsed.lastUploadAt ?? null,
+    };
+  } catch {
+    return { ...DEFAULT_CONSENT };
+  }
+}
+
+/**
+ * Persist a full or partial consent update.
+ */
+export function writeConsent(update: Partial<TelemetryConsent>, mosaicHome?: string): void {
+  const current = readConsent(mosaicHome);
+  const next: TelemetryConsent = { ...current, ...update };
+  atomicWrite(consentFilePath(mosaicHome), JSON.stringify(next, null, 2) + '\n');
+}
+
+/**
+ * Mark opt-in: enable remote upload and record timestamp.
+ */
+export function optIn(mosaicHome?: string): TelemetryConsent {
+  const now = new Date().toISOString();
+  const next: TelemetryConsent = {
+    remoteEnabled: true,
+    optedInAt: now,
+    optedOutAt: null,
+    lastUploadAt: readConsent(mosaicHome).lastUploadAt,
+  };
+  writeConsent(next, mosaicHome);
+  return next;
+}
+
+/**
+ * Mark opt-out: disable remote upload and record timestamp.
+ */
+export function optOut(mosaicHome?: string): TelemetryConsent {
+  const now = new Date().toISOString();
+  const current = readConsent(mosaicHome);
+  const next: TelemetryConsent = {
+    remoteEnabled: false,
+    optedInAt: current.optedInAt,
+    optedOutAt: now,
+    lastUploadAt: current.lastUploadAt,
+  };
+  writeConsent(next, mosaicHome);
+  return next;
+}
+
+/**
+ * Record a successful upload timestamp.
+ */
+export function recordUpload(mosaicHome?: string): void {
+  writeConsent({ lastUploadAt: new Date().toISOString() }, mosaicHome);
+}