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// Copyright 2024 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/tpcd/support/origin_trial_service.h"
#include "base/metrics/histogram_functions.h"
#include "chrome/browser/content_settings/host_content_settings_map_factory.h"
#include "components/content_settings/core/browser/host_content_settings_map.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/document_user_data.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/origin_trials_controller_delegate.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/storage_partition.h"
#include "net/base/features.h"
#include "net/base/registry_controlled_domains/registry_controlled_domain.h"
#include "services/metrics/public/cpp/ukm_builders.h"
#include "services/metrics/public/cpp/ukm_recorder.h"
#include "services/network/public/mojom/cookie_manager.mojom.h"
namespace tpcd::trial {
namespace {
const char kTrialName[] = "LimitThirdPartyCookies";
bool IsSameSite(const GURL& url1, const GURL& url2) {
// We can't use SiteInstance::IsSameSiteWithURL() because both mainframe and
// subframe are under default SiteInstance on low-end Android environment, and
// it treats them as same-site even though the passed url is actually not a
// same-site.
return url1.SchemeIs(url2.scheme()) &&
net::registry_controlled_domains::SameDomainOrHost(
url1, url2,
net::registry_controlled_domains::INCLUDE_PRIVATE_REGISTRIES);
}
} // namespace
OriginTrialService::OriginTrialService(content::BrowserContext* browser_context)
: browser_context_(browser_context) {
ot_controller_ = browser_context->GetOriginTrialsControllerDelegate();
if (ot_controller_) {
ot_controller_->AddObserver(this);
}
}
OriginTrialService::~OriginTrialService() = default;
void OriginTrialService::Shutdown() {
if (ot_controller_) {
ot_controller_->RemoveObserver(this);
}
ot_controller_ = nullptr;
browser_context_ = nullptr;
}
void OriginTrialService::UpdateTopLevelTrialSettingsForTesting(
const url::Origin& origin,
bool match_subdomains,
bool enabled) {
UpdateTopLevelTrialSettings(origin, match_subdomains, enabled);
}
void OriginTrialService::UpdateTopLevelTrialSettings(const url::Origin& origin,
bool match_subdomains,
bool enabled) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
const GURL origin_as_url = origin.GetURL();
ContentSettingsPattern primary_setting_pattern;
if (match_subdomains) {
// `ContentSettingsPattern::FromURL()` returns a pattern with a domain
// wildcard by default.
primary_setting_pattern = ContentSettingsPattern::FromURL(origin_as_url);
} else {
primary_setting_pattern =
ContentSettingsPattern::FromURLNoWildcard(origin_as_url);
}
HostContentSettingsMap* settings_map =
HostContentSettingsMapFactory::GetForProfile(browser_context_);
CHECK(settings_map);
// Check for an existing `TOP_LEVEL_TPCD_ORIGIN_TRIAL` setting that allows
// `origin`. Only the primary pattern is checked since the secondary pattern
// is unused (i.e., wildcard) for this content settings type's scope
// (`TOP_ORIGIN_ONLY_SCOPE`).
content_settings::SettingInfo existing_setting_info;
bool setting_exists =
(settings_map->GetContentSetting(
origin_as_url, GURL(),
ContentSettingsType::TOP_LEVEL_TPCD_ORIGIN_TRIAL,
&existing_setting_info) == CONTENT_SETTING_BLOCK) &&
(existing_setting_info.primary_pattern == primary_setting_pattern);
// If the trial status matches existing settings, there is no need to
// update `settings_map`.
if (enabled == setting_exists) {
return;
}
if (enabled) {
settings_map->SetContentSettingCustomScope(
primary_setting_pattern, ContentSettingsPattern::Wildcard(),
ContentSettingsType::TOP_LEVEL_TPCD_ORIGIN_TRIAL,
CONTENT_SETTING_BLOCK);
} else {
CHECK(setting_exists);
// The trial has been disabled for origin, so remove the associated setting.
auto matches_pattern =
[&](const ContentSettingPatternSource& setting) -> bool {
// Only check the primary_pattern since the settings type uses
// `TOP_ORIGIN_ONLY_SCOPE`.
return (setting.primary_pattern == existing_setting_info.primary_pattern);
};
settings_map->ClearSettingsForOneTypeWithPredicate(
ContentSettingsType::TOP_LEVEL_TPCD_ORIGIN_TRIAL, matches_pattern);
}
ContentSettingsForOneType trial_settings =
settings_map->GetSettingsForOneType(
ContentSettingsType::TOP_LEVEL_TPCD_ORIGIN_TRIAL);
browser_context_->GetDefaultStoragePartition()
->GetCookieManagerForBrowserProcess()
->SetContentSettings(ContentSettingsType::TOP_LEVEL_TPCD_ORIGIN_TRIAL,
std::move(trial_settings), base::NullCallback());
}
void OriginTrialService::ClearTopLevelTrialSettings() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
HostContentSettingsMap* settings_map =
HostContentSettingsMapFactory::GetForProfile(browser_context_);
CHECK(settings_map);
settings_map->ClearSettingsForOneType(
ContentSettingsType::TOP_LEVEL_TPCD_ORIGIN_TRIAL);
}
void OriginTrialService::OnStatusChanged(
const content::OriginTrialStatusChangeDetails& details) {
// LimitThirdPartyCookies is a first-party trial that is only intended for use
// by top-level sites. However, a cross-site iframe may enable a first-party
// origin trial (for itself), so to ensure we only create settings for
// top-level sites, explicitly check that `origin` is same-site with
// `partition_site`.
if (!IsSameSite(details.origin.GetURL(), GURL(details.partition_site))) {
return;
}
UpdateTopLevelTrialSettings(details.origin, details.match_subdomains,
details.enabled);
}
void OriginTrialService::OnPersistedTokensCleared() {
ClearTopLevelTrialSettings();
}
std::string OriginTrialService::trial_name() {
return kTrialName;
}
} // namespace tpcd::trial
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