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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/ash/app_restore/browser_restore_observer.h"
#include "base/check.h"
#include "base/functional/bind.h"
#include "chrome/browser/ash/profiles/profile_helper.h"
#include "chrome/browser/custom_handlers/protocol_handler_registry_factory.h"
#include "chrome/browser/prefs/session_startup_pref.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/profiles/profile_io_data.h"
#include "chrome/browser/sessions/session_restore.h"
#include "chrome/browser/sessions/session_service_utils.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_finder.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/browser_navigator.h"
#include "chrome/browser/ui/browser_navigator_params.h"
#include "chrome/browser/ui/browser_window.h"
#include "chrome/browser/ui/startup/startup_browser_creator.h"
#include "chrome/browser/ui/tabs/tab_enums.h"
#include "components/custom_handlers/protocol_handler_registry.h"
#include "components/sessions/core/session_types.h"
#include "ui/base/page_transition_types.h"
#include "ui/base/window_open_disposition.h"
#include "url/gurl.h"
namespace ash {
namespace {
// Returns true if we can restore URLs for `profile`. Restoring URLs should
// only be allowed for regular signed-in users.
bool CanRestoreUrlsForProfile(const Profile* profile) {
return profile->IsRegularProfile() && !profile->IsSystemProfile() &&
ash::ProfileHelper::IsUserProfile(profile) &&
!ash::ProfileHelper::IsEphemeralUserProfile(profile);
}
// Returns true, if the url defined in the on startup setting should be
// opened. Otherwise, returns false.
bool ShouldRestoreUrls(Browser* browser) {
Profile* profile = browser->profile();
// Only open urls for regular sign in users.
CHECK(profile);
if (!CanRestoreUrlsForProfile(profile)) {
return false;
}
// If during the restore process, or restore from a crash, don't launch urls.
// However, in case of LAST_AND_URLS startup setting, urls should be opened
// even when the restore session is in progress.
SessionStartupPref pref =
SessionStartupPref::GetStartupPref(browser->profile()->GetPrefs());
if ((SessionRestore::IsRestoring(profile) &&
pref.type != SessionStartupPref::LAST_AND_URLS) ||
HasPendingUncleanExit(profile)) {
return false;
}
// App windows should not be restored.
auto window_type = WindowTypeForBrowserType(browser->type());
if (window_type == sessions::SessionWindow::TYPE_APP ||
window_type == sessions::SessionWindow::TYPE_APP_POPUP) {
return false;
}
// If the browser is created by StartupBrowserCreator,
// StartupBrowserCreatorImpl::OpenTabsInBrowser can open tabs, so don't
// restore urls here.
if (browser->creation_source() == Browser::CreationSource::kStartupCreator) {
return false;
}
// If the startup setting is not open urls, don't launch urls.
if (!pref.ShouldOpenUrls() || pref.urls.empty()) {
return false;
}
return true;
}
// Returns true, if the url defined in the on startup setting should be
// opened in a new browser. Otherwise, returns false.
bool ShouldOpenUrlsInNewBrowser(Browser* browser) {
SessionStartupPref pref =
SessionStartupPref::GetStartupPref(browser->profile()->GetPrefs());
return pref.type == SessionStartupPref::LAST_AND_URLS;
}
} // namespace
BrowserRestoreObserver::BrowserRestoreObserver() {
BrowserList::AddObserver(this);
}
BrowserRestoreObserver::~BrowserRestoreObserver() {
BrowserList::RemoveObserver(this);
}
void BrowserRestoreObserver::OnBrowserAdded(Browser* browser) {
// If |browser| is the only browser, restores urls based on the on startup
// setting.
if (chrome::GetBrowserCount(browser->profile()) == 1 &&
ShouldRestoreUrls(browser)) {
if (ShouldOpenUrlsInNewBrowser(browser)) {
// Delay creating a new browser until |browser| is activated.
on_session_restored_callback_subscription_ =
SessionRestore::RegisterOnSessionRestoredCallback(
base::BindRepeating(&BrowserRestoreObserver::OnSessionRestoreDone,
base::Unretained(this)));
} else {
RestoreUrls(browser);
}
}
// If the startup urls from LAST_AND_URLS pref are already opened in a new
// browser, skip opening the same browser.
if (browser->creation_source() ==
Browser::CreationSource::kLastAndUrlsStartupPref) {
CHECK(on_session_restored_callback_subscription_);
on_session_restored_callback_subscription_ = {};
}
}
// static
bool BrowserRestoreObserver::CanRestoreUrlsForProfileForTesting(
const Profile* profile) {
return CanRestoreUrlsForProfile(profile);
}
void BrowserRestoreObserver::OnSessionRestoreDone(Profile* profile,
int num_tabs_restored) {
// Ensure this callback to be called exactly once.
on_session_restored_callback_subscription_ = {};
// All browser windows are created. Open startup urls in a new browser.
auto create_params = Browser::CreateParams(profile, /*user_gesture*/ false);
Browser* browser = Browser::Create(create_params);
RestoreUrls(browser);
browser->window()->Show();
browser->window()->Activate();
}
void BrowserRestoreObserver::RestoreUrls(Browser* browser) {
CHECK(browser);
SessionStartupPref pref =
SessionStartupPref::GetStartupPref(browser->profile()->GetPrefs());
custom_handlers::ProtocolHandlerRegistry* registry =
ProtocolHandlerRegistryFactory::GetForBrowserContext(browser->profile());
for (const GURL& url : pref.urls) {
// We skip URLs that we'd have to launch an external protocol handler for.
// This avoids us getting into an infinite loop asking ourselves to open
// a URL, should the handler be (incorrectly) configured to be us. Anyone
// asking us to open such a URL should really ask the handler directly.
bool handled_by_chrome =
ProfileIOData::IsHandledURL(url) ||
(registry && registry->IsHandledProtocol(url.scheme()));
if (!handled_by_chrome) {
continue;
}
int add_types = AddTabTypes::ADD_NONE | AddTabTypes::ADD_FORCE_INDEX;
NavigateParams params(browser, url, ui::PAGE_TRANSITION_AUTO_TOPLEVEL);
params.disposition = WindowOpenDisposition::NEW_BACKGROUND_TAB;
params.tabstrip_add_types = add_types;
Navigate(¶ms);
}
}
} // namespace ash
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