for _, v := range policy.DefaultPolicies {
		if _, ok := policies[v.Name]; !ok {
			policies[v.Name] = defaultPolicyDoc(v.Definition)
		}
	}
}

// PurgeExpiredSTS - purges expired STS credentials.
func (store *IAMStoreSys) PurgeExpiredSTS(ctx context.Context) error {
	iamOS, ok := store.IAMStorageAPI.(*IAMObjectStore)
	if !ok {
		// No purging is done for non-object storage.
		return nil

	}

	// Initialize byte pool once for all sets, bpool size is set to
	// setCount * setDriveCount with each memory upto blockSizeV2.
	buffers := bpool.NewBytePoolCap(n, blockSizeV2, blockSizeV2*2)
	buffers.Populate()
	globalBytePoolCap.Store(buffers)

	var localDrives []StorageAPI
	local := endpointServerPools.FirstLocal()
	for i, ep := range endpointServerPools {

	}

	toEncode := io.Reader(data)
	if data.Size() >= bigFileThreshold {
		// We use 2 buffers, so we always have a full buffer of input.
		pool := globalBytePoolCap.Load()
		bufA := pool.Get()
		bufB := pool.Get()
		defer pool.Put(bufA)
		defer pool.Put(bufB)