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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 "components/safe_search_api/safe_search/safe_search_url_checker_client.h"
#include <optional>
#include <utility>
#include "base/functional/callback.h"
#include "base/json/json_reader.h"
#include "base/metrics/histogram_functions.h"
#include "base/strings/escape.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/time/time.h"
#include "base/values.h"
#include "components/google/core/common/google_util.h"
#include "net/base/load_flags.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"
#include "services/network/public/cpp/simple_url_loader.h"
#include "url/url_constants.h"
namespace safe_search_api {
namespace {
const char kSafeSearchApiUrl[] =
"https://safesearch.googleapis.com/v1:classify";
const char kDataContentType[] = "application/x-www-form-urlencoded";
const char kDataFormat[] = "key=%s&urls=%s";
// Builds the POST data for SafeSearch API requests.
std::string BuildRequestData(const std::string& api_key, const GURL& url) {
std::string query = base::EscapeQueryParamValue(url.spec(), true);
return base::StringPrintf(kDataFormat, api_key.c_str(), query.c_str());
}
// Parses a SafeSearch API |response| and stores the result in |is_porn|,
// returns true on success. Otherwise, returns false and doesn't set |is_porn|.
bool ParseResponse(const std::string& response, bool* is_porn) {
std::optional<base::Value> optional_value = base::JSONReader::Read(response);
if (!optional_value || !optional_value.value().is_dict()) {
DLOG(WARNING) << "ParseResponse failed to parse global dictionary";
return false;
}
const base::Value::Dict& dict = optional_value.value().GetDict();
const base::Value::List* classifications_list =
dict.FindList("classifications");
if (!classifications_list) {
DLOG(WARNING) << "ParseResponse failed to parse classifications list";
return false;
}
if (classifications_list->size() != 1u) {
DLOG(WARNING) << "ParseResponse expected exactly one result";
return false;
}
const base::Value& classification_value = (*classifications_list)[0];
if (!classification_value.is_dict()) {
DLOG(WARNING) << "ParseResponse failed to parse classification dict";
return false;
}
const base::Value::Dict& classification_dict = classification_value.GetDict();
std::optional<bool> is_porn_opt = classification_dict.FindBool("pornography");
if (is_porn_opt.has_value())
*is_porn = is_porn_opt.value();
return true;
}
} // namespace
struct SafeSearchURLCheckerClient::Check {
Check(const GURL& url,
std::unique_ptr<network::SimpleURLLoader> simple_url_loader,
ClientCheckCallback callback);
~Check();
GURL url;
ClientCheckCallback callback;
std::unique_ptr<network::SimpleURLLoader> simple_url_loader;
base::TimeTicks start_time;
};
SafeSearchURLCheckerClient::Check::Check(
const GURL& url,
std::unique_ptr<network::SimpleURLLoader> simple_url_loader,
ClientCheckCallback callback)
: url(url),
callback(std::move(callback)),
simple_url_loader(std::move(simple_url_loader)),
start_time(base::TimeTicks::Now()) {}
SafeSearchURLCheckerClient::Check::~Check() = default;
SafeSearchURLCheckerClient::SafeSearchURLCheckerClient(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory,
const net::NetworkTrafficAnnotationTag& traffic_annotation,
const std::string& api_key)
: url_loader_factory_(std::move(url_loader_factory)),
traffic_annotation_(traffic_annotation),
api_key_(api_key) {}
SafeSearchURLCheckerClient::~SafeSearchURLCheckerClient() = default;
void SafeSearchURLCheckerClient::CheckURL(const GURL& url,
ClientCheckCallback callback) {
DVLOG(1) << "Checking URL " << url;
auto resource_request = std::make_unique<network::ResourceRequest>();
resource_request->url = GURL(kSafeSearchApiUrl);
resource_request->method = "POST";
resource_request->credentials_mode = network::mojom::CredentialsMode::kOmit;
std::unique_ptr<network::SimpleURLLoader> simple_url_loader =
network::SimpleURLLoader::Create(std::move(resource_request),
traffic_annotation_);
simple_url_loader->AttachStringForUpload(BuildRequestData(api_key_, url),
kDataContentType);
checks_in_progress_.push_front(std::make_unique<Check>(
url, std::move(simple_url_loader), std::move(callback)));
auto it = checks_in_progress_.begin();
network::SimpleURLLoader* loader = it->get()->simple_url_loader.get();
loader->DownloadToStringOfUnboundedSizeUntilCrashAndDie(
url_loader_factory_.get(),
base::BindOnce(&SafeSearchURLCheckerClient::OnSimpleLoaderComplete,
base::Unretained(this), it));
}
void SafeSearchURLCheckerClient::OnSimpleLoaderComplete(
CheckList::iterator it,
std::unique_ptr<std::string> response_body) {
std::unique_ptr<Check> check = std::move(*it);
checks_in_progress_.erase(it);
if (!response_body) {
DLOG(WARNING) << "URL request failed! Letting through...";
std::move(check->callback).Run(check->url, ClientClassification::kUnknown);
return;
}
ClientClassification classification = ClientClassification::kUnknown;
bool is_porn = false;
if (ParseResponse(*response_body, &is_porn)) {
classification = is_porn ? ClientClassification::kRestricted
: ClientClassification::kAllowed;
}
base::UmaHistogramTimes("Enterprise.SafeSites.Latency",
base::TimeTicks::Now() - check->start_time);
std::move(check->callback).Run(check->url, classification);
}
} // namespace safe_search_api
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