| // Copyright 2023 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "chrome/browser/ash/policy/core/file_util.h" |
| |
| #include <string> |
| |
| #include "base/containers/span.h" |
| #include "base/hash/hash.h" |
| #include "base/strings/string_number_conversions.h" |
| #include "base/strings/stringprintf.h" |
| |
| namespace policy { |
| |
| namespace { |
| |
| // The file system APIs error out if we create a directory whose name exceeds |
| // this. |
| // TODO(b/300078530): I manually tested this limit and it seems accurate at the |
| // time of writing, but if we use `base::GetMaximumPathComponentLength` then |
| // there is no need to hard-code anything. However that will require refactoring |
| // callers to use a callback, since `base::GetMaximumPathComponentLength` is |
| // blocking and must be used async. |
| constexpr int kMaxPathComponentLength = 255; |
| |
| bool ExceedsMaximumPathComponentLength(const std::string& component) { |
| return component.size() > kMaxPathComponentLength; |
| } |
| |
| } // namespace |
| |
| std::string GetUniqueSubDirectoryForAccountID(const std::string& account_id) { |
| std::string sub_directory = base::HexEncode(base::as_byte_span(account_id)); |
| if (ExceedsMaximumPathComponentLength(sub_directory)) { |
| // Originally the hex encoded account id was used as sub-directory name, |
| // so we must keep on using that to guarantee backwards compatibility. |
| // However this fails for long account-ids (since the filesystem has a limit |
| // to how long a simple path component can be), in which case we switch to |
| // hashes. |
| return base::StringPrintf("%u", base::PersistentHash(account_id)); |
| } |
| return sub_directory; |
| } |
| |
| } // namespace policy |