chore: import upstream snapshot with attribution

open-sse/services/codeAssistSubscription.ts

@@ -0,0 +1,83 @@
+/**
+ * Code Assist (loadCodeAssist) subscription tier extraction.
+ * Mirrors Antigravity-Manager src-tauri/src/modules/quota.rs fetch_project_id().
+ */
+
+type JsonRecord = Record<string, unknown>;
+
+function toRecord(value: unknown): JsonRecord {
+  return value && typeof value === "object" && !Array.isArray(value) ? (value as JsonRecord) : {};
+}
+
+function pickTierField(tier: unknown, field: "name" | "id"): string | null {
+  const record = toRecord(tier);
+  const value = record[field];
+  return typeof value === "string" && value.trim() ? value.trim() : null;
+}
+
+function isIneligible(subscription: JsonRecord): boolean {
+  const ineligible = subscription.ineligibleTiers;
+  return Array.isArray(ineligible) && ineligible.length > 0;
+}
+
+function findDefaultAllowedTier(subscription: JsonRecord): JsonRecord | null {
+  if (!Array.isArray(subscription.allowedTiers)) return null;
+  for (const tierValue of subscription.allowedTiers) {
+    const tier = toRecord(tierValue);
+    if (tier.isDefault) return tier;
+  }
+  return null;
+}
+
+/**
+ * Display subscription tier from loadCodeAssist (paid → current → restricted default).
+ */
+export function extractCodeAssistSubscriptionTier(subscriptionInfo: unknown): string | null {
+  const subscription = toRecord(subscriptionInfo);
+  if (Object.keys(subscription).length === 0) return null;
+
+  let tier =
+    pickTierField(subscription.paidTier, "name") || pickTierField(subscription.paidTier, "id");
+
+  if (!tier) {
+    if (!isIneligible(subscription)) {
+      tier =
+        pickTierField(subscription.currentTier, "name") ||
+        pickTierField(subscription.currentTier, "id");
+    } else {
+      const defaultTier = findDefaultAllowedTier(subscription);
+      if (defaultTier) {
+        const name = pickTierField(defaultTier, "name");
+        const id = pickTierField(defaultTier, "id");
+        if (name) tier = `${name} (Restricted)`;
+        else if (id) tier = `${id} (Restricted)`;
+      }
+    }
+  }
+
+  return tier;
+}
+
+/**
+ * Tier ID for onboardUser tier_id (paid → current → restricted default → legacy-tier).
+ */
+export function extractCodeAssistOnboardTierId(subscriptionInfo: unknown): string {
+  const subscription = toRecord(subscriptionInfo);
+
+  const paidId = pickTierField(subscription.paidTier, "id");
+  if (paidId) return paidId;
+
+  if (!isIneligible(subscription)) {
+    const currentId = pickTierField(subscription.currentTier, "id");
+    if (currentId) return currentId;
+  }
+
+  const defaultTier = findDefaultAllowedTier(subscription);
+  const defaultId = defaultTier ? pickTierField(defaultTier, "id") : null;
+  if (defaultId) return defaultId;
+
+  const currentId = pickTierField(subscription.currentTier, "id");
+  if (currentId) return currentId;
+
+  return "legacy-tier";
+}