chore: import upstream snapshot with attribution

apps/sim/lib/copilot/block-visibility.ts

@@ -0,0 +1,58 @@
+import { LRUCache } from 'lru-cache'
+import { type BlockVisibilityState, getBlockVisibility } from '@/lib/core/config/block-visibility'
+import { getWorkspaceWithOwner } from '@/lib/workspaces/permissions/utils'
+
+/**
+ * Copilot-side resolver for the viewer's block-visibility projection.
+ *
+ * A single mothership turn fans out into many Go→Sim tool callbacks; resolving
+ * visibility per callback would repeat the workspace→org lookup (and, for
+ * admin-gated rules, a replica read) N times. This memoizes the resolved state
+ * per (userId, workspaceId) for a short TTL matching the AppConfig cache
+ * cadence, so a turn costs at most one resolution.
+ */
+const VISIBILITY_CACHE_TTL_MS = 30_000
+
+const visibilityCache = new LRUCache<string, Promise<BlockVisibilityState>>({
+  max: 1000,
+  ttl: VISIBILITY_CACHE_TTL_MS,
+})
+
+async function resolveVisibility(
+  userId: string,
+  workspaceId?: string
+): Promise<BlockVisibilityState> {
+  const orgId = workspaceId
+    ? (await getWorkspaceWithOwner(workspaceId, { includeArchived: true }))?.organizationId
+    : undefined
+  return getBlockVisibility({ userId, orgId })
+}
+
+/** The viewer's visibility state, memoized per (userId, workspaceId) for ~30s. */
+export function getBlockVisibilityForCopilot(
+  userId: string,
+  workspaceId?: string
+): Promise<BlockVisibilityState> {
+  const key = `${userId}:${workspaceId ?? ''}`
+  let promise = visibilityCache.get(key)
+  if (!promise) {
+    promise = resolveVisibility(userId, workspaceId).catch((error) => {
+      visibilityCache.delete(key)
+      throw error
+    })
+    visibilityCache.set(key, promise)
+  }
+  return promise
+}
+
+/**
+ * Stable signature of a visibility state, for keying caches whose contents
+ * depend on the gated projection (e.g. the integration tool-schema LRU).
+ */
+export function visibilitySignature(vis: BlockVisibilityState): string {
+  return JSON.stringify([
+    [...vis.revealed].sort(),
+    [...vis.disabled].sort(),
+    [...vis.previewTagged].sort(),
+  ])
+}