Add a SafeSearch preference, policy and implementation.

chrome/browser/net/chrome_network_delegate.cc

 // Copyright (c) 2012 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/chrome_network_delegate.h"
 
 #include "base/logging.h"
 #include "base/base_paths.h"
 #include "base/path_service.h"
 #include "chrome/browser/api/prefs/pref_member.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/content_settings/cookie_settings.h"
 #include "chrome/browser/content_settings/tab_specific_content_settings.h"
 #include "chrome/browser/custom_handlers/protocol_handler_registry.h"
 #include "chrome/browser/extensions/api/proxy/proxy_api.h"
 #include "chrome/browser/extensions/api/web_request/web_request_api.h"
 #include "chrome/browser/extensions/event_router_forwarder.h"
 #include "chrome/browser/extensions/extension_info_map.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
+#include "chrome/browser/google/google_util.h"
 #include "chrome/browser/net/load_time_stats.h"
 #include "chrome/browser/performance_monitor/performance_monitor.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/task_manager/task_manager.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/resource_request_info.h"
@@ skipping 50 matching lines @@
     switch (request->status().error()) {
       case net::ERR_PROXY_AUTH_UNSUPPORTED:
       case net::ERR_PROXY_CONNECTION_FAILED:
       case net::ERR_TUNNEL_CONNECTION_FAILED:
         extensions::ProxyEventRouter::GetInstance()->OnProxyError(
             event_router, profile, request->status().error());
     }
   }
 }
 
+void ForceGoogleSafeSearchCallbackWrapper(
+    const net::CompletionCallback& callback,
+    net::URLRequest* request,
+    GURL* new_url,
+    int rv) {
+  if (rv == net::OK && new_url->is_empty())
+    ChromeNetworkDelegate::ForceGoogleSafeSearch(request, new_url);
+  callback.Run(rv);
+}
+
 enum RequestStatus { REQUEST_STARTED, REQUEST_DONE };
 
 // Notifies the ExtensionProcessManager that a request has started or stopped
 // for a particular RenderView.
 void NotifyEPMRequestStatus(RequestStatus status,
                             void* profile_id,
                             int process_id,
                             int render_view_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   Profile* profile = reinterpret_cast<Profile*>(profile_id);
@@ skipping 39 matching lines @@
 
 ChromeNetworkDelegate::ChromeNetworkDelegate(
     extensions::EventRouterForwarder* event_router,
     ExtensionInfoMap* extension_info_map,
     const policy::URLBlacklistManager* url_blacklist_manager,
     const ManagedModeURLFilter* managed_mode_url_filter,
     void* profile,
     CookieSettings* cookie_settings,
     BooleanPrefMember* enable_referrers,
     BooleanPrefMember* enable_do_not_track,
+    BooleanPrefMember* force_google_safesearch,
     chrome_browser_net::LoadTimeStats* load_time_stats)
     : event_router_(event_router),
       profile_(profile),
       cookie_settings_(cookie_settings),
       extension_info_map_(extension_info_map),
       enable_referrers_(enable_referrers),
       enable_do_not_track_(enable_do_not_track),
+      force_google_safesearch_(force_google_safesearch),
       url_blacklist_manager_(url_blacklist_manager),
       managed_mode_url_filter_(managed_mode_url_filter),
       load_time_stats_(load_time_stats) {
   DCHECK(event_router);
   DCHECK(enable_referrers);
   DCHECK(!profile || cookie_settings);
 }
 
 ChromeNetworkDelegate::~ChromeNetworkDelegate() {}
 
 // static
 void ChromeNetworkDelegate::NeverThrottleRequests() {
   g_never_throttle_requests_ = true;
 }
 
 // static
 void ChromeNetworkDelegate::InitializePrefsOnUIThread(
     BooleanPrefMember* enable_referrers,
     BooleanPrefMember* enable_do_not_track,
+    BooleanPrefMember* force_google_safesearch,
     PrefService* pref_service) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   enable_referrers->Init(prefs::kEnableReferrers, pref_service, NULL);
   enable_referrers->MoveToThread(BrowserThread::IO);
   if (enable_do_not_track) {
     enable_do_not_track->Init(prefs::kEnableDoNotTrack, pref_service, NULL);
     enable_do_not_track->MoveToThread(BrowserThread::IO);
   }
+  if (force_google_safesearch) {
+    force_google_safesearch->Init(prefs::kForceSafeSearch, pref_service, NULL);
+    force_google_safesearch->MoveToThread(BrowserThread::IO);
+  }
 }
 
 // static
 void ChromeNetworkDelegate::AllowAccessToAllFiles() {
   g_allow_file_access_ = true;
 }
 
+// static
+void ChromeNetworkDelegate::ForceGoogleSafeSearch(net::URLRequest* request,
+                                                  GURL* new_url) {
+  // Force SafeSearch.
+  const bool is_search_url = google_util::IsGoogleSearchUrl(
+      request->url().spec());
+  const bool is_homepage_url = google_util::IsGoogleHomePageUrl(
+      request->url().spec());
+  if (is_search_url || is_homepage_url) {
+    std::string query = request->url().query();
+    std::string single_parameters = chrome::kSafeSearchParameters;
+    std::string multiple_parameters = "&"+single_parameters;

[Bernhard Bauer, 2012/10/17 15:23:54]

Nit: space before and after operators like "+"

[Sergiu, 2012/10/19 08:40:55]

Done.

+    std::string append_parameters;
+
+    if (is_homepage_url && query.empty())
+      append_parameters = single_parameters;
+    else
+      append_parameters = multiple_parameters;
+    // Make sure that our parameters are either the only ones
+    // or have a & before them so that we don't accept &bogussafe=active.
+    if (query == chrome::kSafeSearchParameters ||
+        query.rfind(multiple_parameters) != std::string::npos)
+      return;

[Bernhard Bauer, 2012/10/17 15:23:54]

Nit: newline please.

[Sergiu, 2012/10/19 08:40:55]

Done.

+    // Add this parameter at the end of this query since it will override the
+    // other parameters.
+    query.append(append_parameters);
+
+    GURL::Replacements replacements;
+    replacements.SetQueryStr(query);
+    *new_url = request->url().ReplaceComponents(replacements);
+  }
+}
+
 int ChromeNetworkDelegate::OnBeforeURLRequest(
     net::URLRequest* request,
     const net::CompletionCallback& callback,
     GURL* new_url) {
 #if defined(ENABLE_CONFIGURATION_POLICY)
   // TODO(joaodasilva): This prevents extensions from seeing URLs that are
   // blocked. However, an extension might redirect the request to another URL,
   // which is not blocked.
   if (url_blacklist_manager_ &&
       url_blacklist_manager_->IsURLBlocked(request->url())) {
@@ skipping 13 matching lines @@
     return net::ERR_NETWORK_ACCESS_DENIED;
   }
 #endif
 
   ForwardRequestStatus(REQUEST_STARTED, request, profile_);
 
   if (!enable_referrers_->GetValue())
     request->set_referrer(std::string());
   if (enable_do_not_track_ && enable_do_not_track_->GetValue())
     request->SetExtraRequestHeaderByName(kDNTHeader, "1", true /* override */);
+
+  if (force_google_safesearch_ && force_google_safesearch_->GetValue()) {
+    net::CompletionCallback wrapped_callback =
+      base::Bind(&ForceGoogleSafeSearchCallbackWrapper,
+                 callback,
+                 base::Unretained(request),
+                 base::Unretained(new_url));
+
+    int rv = ExtensionWebRequestEventRouter::GetInstance()->OnBeforeRequest(
+        profile_, extension_info_map_.get(), request, wrapped_callback,
+        new_url);
+
+    if (rv == net::OK && new_url->is_empty()) {
+      ForceGoogleSafeSearch(request, new_url);
+      return net::OK;
+    }
+
+    return rv;
+  }
+
   return ExtensionWebRequestEventRouter::GetInstance()->OnBeforeRequest(
       profile_, extension_info_map_.get(), request, callback, new_url);
 }
 
 int ChromeNetworkDelegate::OnBeforeSendHeaders(
     net::URLRequest* request,
     const net::CompletionCallback& callback,
     net::HttpRequestHeaders* headers) {
   return ExtensionWebRequestEventRouter::GetInstance()->OnBeforeSendHeaders(
       profile_, extension_info_map_.get(), request, callback, headers);
@@ skipping 216 matching lines @@
 #endif
   return net::OK;
 }
 
 void ChromeNetworkDelegate::OnRequestWaitStateChange(
     const net::URLRequest& request,
     RequestWaitState state) {
   if (load_time_stats_)
     load_time_stats_->OnRequestWaitStateChange(request, state);
 }