components/offline_pages/core/auto_fetch.cc

// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "components/offline_pages/core/auto_fetch.h"

#include "base/strings/strcat.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_piece.h"
#include "components/offline_pages/core/client_namespace_constants.h"

namespace offline_pages {
namespace auto_fetch {
ClientIdMetadata::ClientIdMetadata() = default;
ClientIdMetadata::ClientIdMetadata(const ClientIdMetadata&) = default;

ClientId MakeClientId(const ClientIdMetadata& metadata) {
  // Here, the 'A' prefix is used so that future versions can easily change the
  // format if necessary.
  return ClientId(kAutoAsyncNamespace,
                  base::StrCat({"A", std::to_string(metadata.android_tab_id)}));
}

base::Optional<ClientIdMetadata> ExtractMetadata(const ClientId& id) {
  if (id.name_space != kAutoAsyncNamespace)
    return base::nullopt;
  if (id.id.empty() || id.id[0] != 'A')
    return base::nullopt;
  ClientIdMetadata metadata;
  if (!base::StringToInt(base::StringPiece(id.id).substr(1),
                         &metadata.android_tab_id))
    return base::nullopt;
  return metadata;
}

}  // namespace auto_fetch
}  // namespace offline_pages