Function cacheSignature

packages/arctic/src/auth/antigravity-oauth/cache.ts:102–131

(sessionId: string, text: string, signature: string)

 * Used for Claude models that require signed thinking blocks in multi-turn conversations.
 */
export function cacheSignature(sessionId: string, text: string, signature: string): void {
  if (!sessionId || !text || !signature) return;

  let sessionCache = signatureCache.get(sessionId);
  if (!sessionCache) {
    sessionCache = new Map();
    signatureCache.set(sessionId, sessionCache);
  }

  // Evict old entries if we're at capacity
  if (sessionCache.size >= MAX_ENTRIES_PER_SESSION) {
    const now = Date.now();
    for (const [key, entry] of sessionCache.entries()) {
      if (now - entry.timestamp > SIGNATURE_CACHE_TTL_MS) {
        sessionCache.delete(key);
      }
    }
    // If still at capacity, remove oldest entries
    if (sessionCache.size >= MAX_ENTRIES_PER_SESSION) {
      const entries = Array.from(sessionCache.entries()).sort((a, b) => a[1].timestamp - b[1].timestamp);
      const toRemove = entries.slice(0, Math.floor(MAX_ENTRIES_PER_SESSION / 4));
      for (const [key] of toRemove) {
        sessionCache.delete(key);
      }
    }
  }

  const textHash = hashText(text);
  sessionCache.set(textHash, { signature, timestamp: Date.now() });
}

/**
 * Retrieves a cached signature for a given session and text.