javascript/internal/binary_keyset_writer.ts

/**
 * @license
 * Copyright 2020 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import {SecurityException} from '../exception/security_exception';
import {KeysetWriter} from './keyset_writer';
import {PbEncryptedKeyset, PbKeyset} from './proto';

/**
 * KeysetWriter knows how to write a keyset or an encrypted keyset.
 *
 * @final
 */
export class BinaryKeysetWriter implements KeysetWriter {
  encodeBinary(keyset: PbKeyset|PbEncryptedKeyset): Uint8Array {
    // keep serializeBinary calls monomorphic
    if (keyset instanceof PbKeyset) {
      return keyset.serializeBinary();
    }
    if (keyset instanceof PbEncryptedKeyset) {
      return keyset.serializeBinary();
    }
    throw new SecurityException('unexpected type for keyset.');
  }
}