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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/safe_browsing/download_feedback_service.h"
#include <utility>
#include "base/bind.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/metrics/histogram_macros.h"
#include "base/supports_user_data.h"
#include "base/task_runner.h"
#include "chrome/browser/safe_browsing/download_feedback.h"
#include "content/public/browser/download_danger_type.h"
#include "content/public/browser/download_item.h"
namespace safe_browsing {
namespace {
const void* const kPingKey = &kPingKey;
class DownloadFeedbackPings : public base::SupportsUserData::Data {
public:
DownloadFeedbackPings(const std::string& ping_request,
const std::string& ping_response);
// Stores the ping data in the given |download|.
static void CreateForDownload(content::DownloadItem* download,
const std::string& ping_request,
const std::string& ping_response);
// Returns the DownloadFeedbackPings object associated with |download|. May
// return NULL.
static DownloadFeedbackPings* FromDownload(
const content::DownloadItem& download);
const std::string& ping_request() const {
return ping_request_;
}
const std::string& ping_response() const {
return ping_response_;
}
private:
std::string ping_request_;
std::string ping_response_;
};
DownloadFeedbackPings::DownloadFeedbackPings(const std::string& ping_request,
const std::string& ping_response)
: ping_request_(ping_request),
ping_response_(ping_response) {
}
// static
void DownloadFeedbackPings::CreateForDownload(
content::DownloadItem* download,
const std::string& ping_request,
const std::string& ping_response) {
DownloadFeedbackPings* pings = new DownloadFeedbackPings(ping_request,
ping_response);
download->SetUserData(kPingKey, pings);
}
// static
DownloadFeedbackPings* DownloadFeedbackPings::FromDownload(
const content::DownloadItem& download) {
return static_cast<DownloadFeedbackPings*>(download.GetUserData(kPingKey));
}
} // namespace
DownloadFeedbackService::DownloadFeedbackService(
net::URLRequestContextGetter* request_context_getter,
base::TaskRunner* file_task_runner)
: request_context_getter_(request_context_getter),
file_task_runner_(file_task_runner),
weak_ptr_factory_(this) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
}
DownloadFeedbackService::~DownloadFeedbackService() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
}
// static
void DownloadFeedbackService::MaybeStorePingsForDownload(
DownloadProtectionService::DownloadCheckResult result,
content::DownloadItem* download,
const std::string& ping,
const std::string& response) {
switch (result) {
case DownloadProtectionService::UNKNOWN:
case DownloadProtectionService::SAFE:
case DownloadProtectionService::DANGEROUS:
return;
case DownloadProtectionService::UNCOMMON:
case DownloadProtectionService::DANGEROUS_HOST:
case DownloadProtectionService::POTENTIALLY_UNWANTED:
break; // Fall through.
}
UMA_HISTOGRAM_COUNTS("SBDownloadFeedback.SizeEligibleKB",
download->GetReceivedBytes() / 1024);
if (download->GetReceivedBytes() > DownloadFeedback::kMaxUploadSize)
return;
DownloadFeedbackPings::CreateForDownload(download, ping, response);
}
// static
bool DownloadFeedbackService::IsEnabledForDownload(
const content::DownloadItem& download) {
return !!DownloadFeedbackPings::FromDownload(download);
}
// static
bool DownloadFeedbackService::GetPingsForDownloadForTesting(
const content::DownloadItem& download,
std::string* ping,
std::string* response) {
DownloadFeedbackPings* pings = DownloadFeedbackPings::FromDownload(download);
if (!pings)
return false;
*ping = pings->ping_request();
*response = pings->ping_response();
return true;
}
// static
void DownloadFeedbackService::RecordEligibleDownloadShown(
content::DownloadDangerType danger_type) {
UMA_HISTOGRAM_ENUMERATION("SBDownloadFeedback.Eligible",
danger_type,
content::DOWNLOAD_DANGER_TYPE_MAX);
}
void DownloadFeedbackService::BeginFeedbackForDownload(
content::DownloadItem* download,
DownloadCommands::Command download_command) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
UMA_HISTOGRAM_ENUMERATION("SBDownloadFeedback.Activations",
download->GetDangerType(),
content::DOWNLOAD_DANGER_TYPE_MAX);
DownloadFeedbackPings* pings = DownloadFeedbackPings::FromDownload(*download);
DCHECK(pings);
download->StealDangerousDownload(
download_command == DownloadCommands::DISCARD,
base::Bind(&DownloadFeedbackService::BeginFeedbackOrDeleteFile,
file_task_runner_, weak_ptr_factory_.GetWeakPtr(),
pings->ping_request(), pings->ping_response()));
if (download_command == DownloadCommands::KEEP)
DownloadCommands(download).ExecuteCommand(download_command);
}
// static
void DownloadFeedbackService::BeginFeedbackOrDeleteFile(
const scoped_refptr<base::TaskRunner>& file_task_runner,
const base::WeakPtr<DownloadFeedbackService>& service,
const std::string& ping_request,
const std::string& ping_response,
const base::FilePath& path) {
if (service) {
bool is_path_empty = path.empty();
UMA_HISTOGRAM_BOOLEAN("SBDownloadFeedback.EmptyFilePathFailure",
is_path_empty);
if (is_path_empty)
return;
service->BeginFeedback(ping_request, ping_response, path);
} else {
file_task_runner->PostTask(
FROM_HERE,
base::Bind(base::IgnoreResult(&base::DeleteFile), path, false));
}
}
void DownloadFeedbackService::StartPendingFeedback() {
DCHECK(!active_feedback_.empty());
active_feedback_.front()->Start(base::Bind(
&DownloadFeedbackService::FeedbackComplete, base::Unretained(this)));
}
void DownloadFeedbackService::BeginFeedback(const std::string& ping_request,
const std::string& ping_response,
const base::FilePath& path) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
std::unique_ptr<DownloadFeedback> feedback(DownloadFeedback::Create(
request_context_getter_.get(), file_task_runner_.get(), path,
ping_request, ping_response));
active_feedback_.push(std::move(feedback));
UMA_HISTOGRAM_COUNTS_100("SBDownloadFeedback.ActiveFeedbacks",
active_feedback_.size());
if (active_feedback_.size() == 1)
StartPendingFeedback();
}
void DownloadFeedbackService::FeedbackComplete() {
DVLOG(1) << __func__;
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(!active_feedback_.empty());
active_feedback_.pop();
if (!active_feedback_.empty())
StartPendingFeedback();
}
} // namespace safe_browsing
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