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// Copyright 2014 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/net/safe_search_util.h"
#include <string>
#include <utility>
#include <vector>
#include "base/logging.h"
#include "base/macros.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_piece.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "chrome/common/url_constants.h"
#include "components/google/core/browser/google_util.h"
#include "net/cookies/cookie_util.h"
#include "net/http/http_request_headers.h"
#include "net/url_request/url_request.h"
#include "url/gurl.h"
namespace {
int g_force_google_safe_search_count_for_test = 0;
int g_force_youtube_safety_mode_count_for_test = 0;
const char kYouTubeSafetyModeHeaderName[] = "YouTube-Safety-Mode";
const char kYouTubeSafetyModeHeaderValue[] = "Active";
// Returns whether a URL parameter, |first_parameter| (e.g. foo=bar), has the
// same key as the the |second_parameter| (e.g. foo=baz). Both parameters
// must be in key=value form.
bool HasSameParameterKey(const std::string& first_parameter,
const std::string& second_parameter) {
DCHECK(second_parameter.find("=") != std::string::npos);
// Prefix for "foo=bar" is "foo=".
std::string parameter_prefix = second_parameter.substr(
0, second_parameter.find("=") + 1);
return base::StartsWith(first_parameter, parameter_prefix,
base::CompareCase::INSENSITIVE_ASCII);
}
// Examines the query string containing parameters and adds the necessary ones
// so that SafeSearch is active. |query| is the string to examine and the
// return value is the |query| string modified such that SafeSearch is active.
std::string AddSafeSearchParameters(const std::string& query) {
std::vector<std::string> new_parameters;
std::string safe_parameter = chrome::kSafeSearchSafeParameter;
std::string ssui_parameter = chrome::kSafeSearchSsuiParameter;
for (const std::string& param : base::SplitString(
query, "&", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
if (!HasSameParameterKey(param, safe_parameter) &&
!HasSameParameterKey(param, ssui_parameter)) {
new_parameters.push_back(param);
}
}
new_parameters.push_back(safe_parameter);
new_parameters.push_back(ssui_parameter);
return base::JoinString(new_parameters, "&");
}
} // namespace
namespace safe_search_util {
// If |request| is a request to Google Web Search the function
// enforces that the SafeSearch query parameters are set to active.
// Sets the query part of |new_url| with the new value of the parameters.
void ForceGoogleSafeSearch(const net::URLRequest* request, GURL* new_url) {
++g_force_google_safe_search_count_for_test;
if (!google_util::IsGoogleSearchUrl(request->url()) &&
!google_util::IsGoogleHomePageUrl(request->url()))
return;
std::string query = request->url().query();
std::string new_query = AddSafeSearchParameters(query);
if (query == new_query)
return;
GURL::Replacements replacements;
replacements.SetQueryStr(new_query);
*new_url = request->url().ReplaceComponents(replacements);
}
// If |request| is a request to YouTube, enforces YouTube's Safety Mode by
// setting YouTube's Safety Mode header.
void ForceYouTubeSafetyMode(const net::URLRequest* request,
net::HttpRequestHeaders* headers) {
++g_force_youtube_safety_mode_count_for_test;
if (!google_util::IsYoutubeDomainUrl(
request->url(),
google_util::ALLOW_SUBDOMAIN,
google_util::DISALLOW_NON_STANDARD_PORTS))
return;
headers->SetHeader(kYouTubeSafetyModeHeaderName,
kYouTubeSafetyModeHeaderValue);
}
int GetForceGoogleSafeSearchCountForTesting() {
return g_force_google_safe_search_count_for_test;
}
int GetForceYouTubeSafetyModeCountForTesting() {
return g_force_youtube_safety_mode_count_for_test;
}
void ClearForceGoogleSafeSearchCountForTesting() {
g_force_google_safe_search_count_for_test = 0;
}
void ClearForceYouTubeSafetyModeCountForTesting() {
g_force_youtube_safety_mode_count_for_test = 0;
}
} // namespace safe_search_util
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