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// Copyright 2019 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/permissions/crowd_deny_safe_browsing_request.h"
#include <utility>
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/metrics/histogram_functions.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/task_runner.h"
#include "base/task/task_traits.h"
#include "base/time/clock.h"
#include "base/timer/timer.h"
#include "components/safe_browsing/core/browser/db/database_manager.h"
#include "components/safe_browsing/core/common/features.h"
#include "content/public/browser/browser_thread.h"
#include "url/origin.h"
namespace {
// The permission identifier string used by Safe Browsing for notifications.
constexpr char kSafeBrowsingNotificationPermissionName[] = "NOTIFICATIONS";
// The maximum amount of time to wait for the Safe Browsing response.
constexpr base::TimeDelta kSafeBrowsingCheckTimeout = base::Seconds(2);
} // namespace
// CrowdDenySafeBrowsingRequest::SafeBrowsingClient --------------------------
class CrowdDenySafeBrowsingRequest::SafeBrowsingClient
: public safe_browsing::SafeBrowsingDatabaseManager::Client {
public:
SafeBrowsingClient(
base::PassKey<safe_browsing::SafeBrowsingDatabaseManager::Client>
pass_key,
scoped_refptr<safe_browsing::SafeBrowsingDatabaseManager>
database_manager,
base::WeakPtr<CrowdDenySafeBrowsingRequest> handler,
scoped_refptr<base::TaskRunner> handler_task_runner)
: safe_browsing::SafeBrowsingDatabaseManager::Client(std::move(pass_key)),
database_manager_(database_manager),
handler_(handler),
handler_task_runner_(handler_task_runner) {}
~SafeBrowsingClient() override {
if (timeout_.IsRunning())
database_manager_->CancelApiCheck(this);
}
void CheckOrigin(const url::Origin& origin) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
// Start the timer before the call to CheckApiBlocklistUrl(), as it may
// call back into OnCheckApiBlocklistUrlResult() synchronously.
timeout_.Start(FROM_HERE, kSafeBrowsingCheckTimeout, this,
&SafeBrowsingClient::OnTimeout);
if (database_manager_->CheckApiBlocklistUrl(origin.GetURL(), this)) {
timeout_.Stop();
SendResultToHandler(Verdict::kAcceptable);
}
}
private:
SafeBrowsingClient(const SafeBrowsingClient&) = delete;
SafeBrowsingClient& operator=(const SafeBrowsingClient&) = delete;
static Verdict ExtractVerdictFromMetadata(
const safe_browsing::ThreatMetadata& metadata) {
return metadata.api_permissions.count(
kSafeBrowsingNotificationPermissionName)
? Verdict::kUnacceptable
: Verdict::kAcceptable;
}
void OnTimeout() {
database_manager_->CancelApiCheck(this);
SendResultToHandler(Verdict::kAcceptable);
}
void SendResultToHandler(Verdict verdict) {
handler_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&CrowdDenySafeBrowsingRequest::OnReceivedResult,
handler_, verdict));
}
// SafeBrowsingDatabaseManager::Client:
void OnCheckApiBlocklistUrlResult(
const GURL& url,
const safe_browsing::ThreatMetadata& metadata) override {
timeout_.Stop();
SendResultToHandler(ExtractVerdictFromMetadata(metadata));
}
base::OneShotTimer timeout_;
scoped_refptr<safe_browsing::SafeBrowsingDatabaseManager> database_manager_;
base::WeakPtr<CrowdDenySafeBrowsingRequest> handler_;
scoped_refptr<base::TaskRunner> handler_task_runner_;
};
// CrowdDenySafeBrowsingRequest ----------------------------------------------
CrowdDenySafeBrowsingRequest::CrowdDenySafeBrowsingRequest(
scoped_refptr<safe_browsing::SafeBrowsingDatabaseManager> database_manager,
const base::Clock* clock,
const url::Origin& origin,
VerdictCallback callback)
: callback_(std::move(callback)),
clock_(clock),
request_start_time_(clock->Now()) {
client_ = std::make_unique<SafeBrowsingClient>(
safe_browsing::SafeBrowsingDatabaseManager::Client::GetPassKey(),
database_manager, weak_factory_.GetWeakPtr(),
base::SequencedTaskRunner::GetCurrentDefault());
client_->CheckOrigin(origin);
}
CrowdDenySafeBrowsingRequest::~CrowdDenySafeBrowsingRequest() = default;
void CrowdDenySafeBrowsingRequest::OnReceivedResult(Verdict verdict) {
base::UmaHistogramTimes("Permissions.CrowdDeny.SafeBrowsing.RequestDuration",
clock_->Now() - request_start_time_);
base::UmaHistogramEnumeration("Permissions.CrowdDeny.SafeBrowsing.Verdict",
verdict);
DCHECK(callback_);
std::move(callback_).Run(verdict);
}
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