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// Copyright 2025 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/default_browser/default_browser_monitor.h"
#include <windows.h>
#include <array>
#include <memory>
#include <string>
#include <string_view>
#include <vector>
#include "base/functional/bind.h"
#include "chrome/browser/win/registry_watcher.h"
namespace default_browser {
namespace {
// The registry paths for the default browser choice for http and https.
constexpr std::array<std::wstring_view, 2> kDefaultBrowserSchemes = {
L"Software\\Microsoft\\Windows\\Shell\\Associations\\UrlAssociations\\http"
L"\\UserChoice",
L"Software\\Microsoft\\Windows\\Shell\\Associations\\UrlAssociations\\https"
L"\\UserChoice"};
} // namespace
void DefaultBrowserMonitor::StartMonitor() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// Create a new watcher, transferring ownership to the unique_ptr.
// The watcher will call OnDefaultBrowserChanged when a change is detected.
registry_watcher_ = std::make_unique<RegistryWatcher>(
std::vector<std::wstring>(kDefaultBrowserSchemes.begin(),
kDefaultBrowserSchemes.end()),
base::BindOnce(&DefaultBrowserMonitor::OnDefaultBrowserChangedWin,
// base::Unretained is safe because `this` monitor owns
// the `registry_watcher_`. The watcher will be destroyed
// before the monitor is, so the callback can't be called
// on a dangling pointer.
base::Unretained(this)));
}
void DefaultBrowserMonitor::OnDefaultBrowserChangedWin() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// The old watcher has fired and done its job.
registry_watcher_.reset();
// Notify observers that a change occurred.
NotifyObservers();
// Start a new watch to be notified of the *next* change.
StartMonitor();
}
} // namespace default_browser
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