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// Copyright 2012 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/extensions/preference/preference_helpers.h"
#include <memory>
#include <utility>
#include "base/json/json_writer.h"
#include "base/values.h"
#include "chrome/browser/extensions/extension_util.h"
#include "chrome/browser/profiles/profile.h"
#include "components/prefs/pref_service.h"
#include "extensions/browser/event_router.h"
#include "extensions/browser/extension_prefs.h"
#include "extensions/browser/extension_prefs_helper.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/browser/extension_util.h"
#include "extensions/common/extension_id.h"
#include "extensions/common/manifest_handlers/incognito_info.h"
#include "extensions/common/permissions/permissions_data.h"
namespace extensions {
namespace preference_helpers {
namespace {
constexpr char kNotControllable[] = "not_controllable";
constexpr char kControlledByOtherExtensions[] =
"controlled_by_other_extensions";
constexpr char kControllableByThisExtension[] =
"controllable_by_this_extension";
constexpr char kControlledByThisExtension[] = "controlled_by_this_extension";
constexpr char kLevelOfControlKey[] = "levelOfControl";
} // namespace
using LevelOfControlGetter =
base::RepeatingCallback<const char*(Profile*,
const ExtensionId& extension_id,
const std::string& browser_pref,
bool incognito)>;
PrefService* GetProfilePrefService(Profile* profile, bool incognito) {
if (incognito) {
if (profile->HasPrimaryOTRProfile()) {
return profile->GetPrimaryOTRProfile(/*create_if_needed=*/false)
->GetPrefs();
}
return profile->GetReadOnlyOffTheRecordPrefs();
}
return profile->GetPrefs();
}
const char* GetLevelOfControl(Profile* profile,
const ExtensionId& extension_id,
const std::string& browser_pref,
bool incognito) {
PrefService* prefs = GetProfilePrefService(profile, incognito);
bool from_incognito = false;
bool* from_incognito_ptr = incognito ? &from_incognito : nullptr;
const PrefService::Preference* pref = prefs->FindPreference(browser_pref);
if (!pref->IsExtensionModifiable())
return kNotControllable;
if (ExtensionPrefsHelper::Get(profile)->DoesExtensionControlPref(
extension_id, browser_pref, from_incognito_ptr)) {
return kControlledByThisExtension;
}
if (ExtensionPrefsHelper::Get(profile)->CanExtensionControlPref(
extension_id, browser_pref, incognito)) {
return kControllableByThisExtension;
}
return kControlledByOtherExtensions;
}
void DispatchEventToExtensionsImpl(Profile* profile,
events::HistogramValue histogram_value,
const std::string& event_name,
base::Value::List args,
mojom::APIPermissionID permission,
bool incognito,
const std::string& browser_pref,
const LevelOfControlGetter level_getter) {
EventRouter* router = EventRouter::Get(profile);
if (!router || !router->HasEventListener(event_name))
return;
for (const scoped_refptr<const extensions::Extension>& extension :
ExtensionRegistry::Get(profile)->enabled_extensions()) {
// TODO(bauerb): Only iterate over registered event listeners.
if (router->ExtensionHasEventListener(extension->id(), event_name) &&
extension->permissions_data()->HasAPIPermission(permission) &&
(!incognito || util::IsIncognitoEnabled(extension->id(), profile))) {
// Inject level of control key-value.
DCHECK(!args.empty());
DCHECK(args[0].is_dict());
std::string level_of_control =
level_getter.Run(profile, extension->id(), browser_pref, incognito);
args[0].GetDict().Set(kLevelOfControlKey, level_of_control);
// If the extension is in incognito split mode,
// a) incognito pref changes are visible only to the incognito tabs
// b) regular pref changes are visible only to the incognito tabs if the
// incognito pref has not already been set
Profile* restrict_to_profile = nullptr;
if (IncognitoInfo::IsSplitMode(extension.get())) {
if (incognito) { // Handle case a).
// If off the record profile does not exist, there should be no
// extensions running in incognito at this time, and consequentially
// no need to dispatch an event restricted to an incognito extension.
// Furthermore, avoid calling GetPrimaryOTRProfile() if the profile
// does not exist. Unnecessarily creating off the record profile is
// undesirable, and can lead to a crash if incognito is disallowed for
// the current profile (see https://crbug.com/796814).
if (!profile->HasPrimaryOTRProfile())
continue;
restrict_to_profile =
profile->GetPrimaryOTRProfile(/*create_if_needed=*/true);
} else { // Handle case b).
bool controlled_from_incognito = false;
bool controlled_by_extension =
ExtensionPrefsHelper::Get(profile)->DoesExtensionControlPref(
extension->id(), browser_pref, &controlled_from_incognito);
if (controlled_by_extension && controlled_from_incognito)
restrict_to_profile = profile;
}
}
base::Value::List args_copy = args.Clone();
auto event =
std::make_unique<Event>(histogram_value, event_name,
std::move(args_copy), restrict_to_profile);
router->DispatchEventToExtension(extension->id(), std::move(event));
}
}
}
void DispatchEventToExtensions(Profile* profile,
events::HistogramValue histogram_value,
const std::string& event_name,
base::Value::List args,
mojom::APIPermissionID permission,
bool incognito,
const std::string& browser_pref) {
DispatchEventToExtensionsImpl(
profile, histogram_value, event_name, std::move(args), permission,
incognito, browser_pref, base::BindRepeating(GetLevelOfControl));
}
} // namespace preference_helpers
} // namespace extensions
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