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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/actor/site_policy.h"
#include <string>
#include <string_view>
#include <vector>
#include "base/containers/contains.h"
#include "base/feature_list.h"
#include "base/functional/callback.h"
#include "base/notimplemented.h"
#include "base/strings/string_split.h"
#include "base/task/sequenced_task_runner.h"
#include "chrome/browser/actor/actor_features.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/optimization_guide/optimization_guide_keyed_service.h"
#include "chrome/browser/optimization_guide/optimization_guide_keyed_service_factory.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/actor/actor_logging.h"
#include "components/optimization_guide/core/optimization_guide_decision.h"
#include "components/optimization_guide/core/optimization_guide_util.h"
#include "components/optimization_guide/proto/hints.pb.h"
#include "components/safe_browsing/buildflags.h"
#include "components/tabs/public/tab_interface.h"
#include "components/variations/service/variations_service.h"
#include "content/public/browser/web_contents.h"
#include "net/base/url_util.h"
#include "url/gurl.h"
#include "url/url_constants.h"
#if BUILDFLAG(SAFE_BROWSING_AVAILABLE)
#include "chrome/browser/safe_browsing/user_interaction_observer.h"
#endif
namespace actor {
namespace {
void ResolveDecision(DecisionCallback callback, bool decision) {
// Some decisions are made asynchronously, so always invoke the callback
// asynchronously for consistency.
ACTOR_LOG() << __func__ << ": Decided to " << (decision ? "allow" : "block")
<< " for actions";
base::SequencedTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, base::BindOnce(std::move(callback), decision));
}
// Returns true if `url`'s host is in the `allowlist`. If `include_subdomains`
// is true, subdomains also match if the parent domain is in the list.
bool IsHostInAllowList(const std::vector<std::string_view>& allowlist,
const GURL& url,
bool include_subdomains) {
if (!include_subdomains) {
return base::Contains(allowlist, url.host_piece());
}
std::string host = url.host();
while (!host.empty()) {
if (base::Contains(allowlist, host)) {
return true;
}
host = net::GetSuperdomain(host);
}
return false;
}
void OnOptimizationGuideDecision(
DecisionCallback callback,
optimization_guide::OptimizationGuideDecision decision,
const optimization_guide::OptimizationMetadata& metadata) {
ACTOR_LOG() << __func__ << ": OptimizationGuideDecision is "
<< optimization_guide::GetStringForOptimizationGuideDecision(
decision);
ResolveDecision(
std::move(callback),
decision == optimization_guide::OptimizationGuideDecision::kTrue);
}
void MayActOnUrl(const GURL& url, Profile* profile, DecisionCallback callback) {
ACTOR_LOG() << __func__ << ": Considering for eligibility \"" << url.spec()
<< "\"";
if (net::IsLocalhost(url) || url.IsAboutBlank()) {
ResolveDecision(std::move(callback), true);
return;
}
if (!url.SchemeIs(url::kHttpsScheme) || url.HostIsIPAddress()) {
ACTOR_LOG() << __func__ << ": Wrong scheme";
ResolveDecision(std::move(callback), false);
return;
}
if (base::FeatureList::IsEnabled(kGlicActionAllowlist)) {
const std::string allowlist_joined = kAllowlist.Get();
const std::vector<std::string_view> allowlist =
base::SplitStringPiece(allowlist_joined, ",", base::TRIM_WHITESPACE,
base::SPLIT_WANT_NONEMPTY);
if (IsHostInAllowList(allowlist, url, /*include_subdomains=*/true)) {
ResolveDecision(std::move(callback), true);
return;
}
const std::string allowlist_exact_joined = kAllowlistExact.Get();
const std::vector<std::string_view> allowlist_exact =
base::SplitStringPiece(allowlist_exact_joined, ",",
base::TRIM_WHITESPACE,
base::SPLIT_WANT_NONEMPTY);
if (IsHostInAllowList(allowlist_exact, url, /*include_subdomains=*/false)) {
ResolveDecision(std::move(callback), true);
return;
}
if (kAllowlistOnly.Get()) {
if (allowlist.empty() && allowlist_exact.empty()) {
ACTOR_LOG() << __func__ << ": Allowlist is empty";
if (variations::VariationsService* variations_service =
g_browser_process->variations_service()) {
if (!variations_service->IsLikelyDogfoodClient()) {
ACTOR_LOG() << __func__ << ": Non-dogfood client";
}
if (variations_service->GetClientFilterableStateForVersion()
->GoogleGroups()
.empty()) {
ACTOR_LOG() << __func__ << ": No Google groups";
}
}
} else {
ACTOR_LOG() << __func__ << ": URL not in allowlist";
}
ResolveDecision(std::move(callback), false);
return;
}
}
if (auto* optimization_guide_decider =
OptimizationGuideKeyedServiceFactory::GetForProfile(profile);
optimization_guide_decider &&
base::FeatureList::IsEnabled(kGlicActionUseOptimizationGuide)) {
optimization_guide_decider->CanApplyOptimization(
url, optimization_guide::proto::GLIC_ACTION_PAGE_BLOCK,
base::BindOnce(&OnOptimizationGuideDecision, std::move(callback)));
return;
}
// Fail closed.
ResolveDecision(std::move(callback), false);
}
} // namespace
void InitActionBlocklist(Profile* profile) {
if (auto* optimization_guide_decider =
OptimizationGuideKeyedServiceFactory::GetForProfile(profile);
optimization_guide_decider &&
base::FeatureList::IsEnabled(kGlicActionUseOptimizationGuide)) {
optimization_guide_decider->RegisterOptimizationTypes(
{optimization_guide::proto::GLIC_ACTION_PAGE_BLOCK});
}
}
// TODO(mcnee): Add UMA for the outcomes.
void MayActOnTab(const tabs::TabInterface& tab, DecisionCallback callback) {
content::WebContents& web_contents = *tab.GetContents();
if (web_contents.GetPrimaryMainFrame()->IsErrorDocument()) {
ACTOR_LOG() << __func__ << ": Tab is an error document";
ResolveDecision(std::move(callback), false);
return;
}
#if BUILDFLAG(SAFE_BROWSING_AVAILABLE)
// SafeBrowsing Delayed Warnings experiment can delay some SafeBrowsing
// warnings until user interaction. If the current page has a delayed warning,
// it'll have a user interaction observer attached.
// Do not act on such a page.
if (safe_browsing::SafeBrowsingUserInteractionObserver::FromWebContents(
&web_contents)) {
ACTOR_LOG() << __func__ << ": Blocked by safebrowsing";
ResolveDecision(std::move(callback), false);
return;
}
#endif
const GURL& url = web_contents.GetPrimaryMainFrame()->GetLastCommittedURL();
MayActOnUrl(url,
Profile::FromBrowserContext(web_contents.GetBrowserContext()),
std::move(callback));
}
} // namespace actor
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