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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/ui/webui/chromeos/salsa_ui.h"
      6 
      7 #include "base/bind.h"
      8 #include "base/memory/scoped_ptr.h"
      9 #include "base/prefs/pref_service.h"
     10 #include "base/values.h"
     11 #include "chrome/browser/browser_process.h"
     12 #include "chrome/browser/profiles/profile.h"
     13 #include "chrome/common/pref_names.h"
     14 #include "chrome/common/url_constants.h"
     15 #include "content/public/browser/browser_thread.h"
     16 #include "content/public/browser/web_ui.h"
     17 #include "content/public/browser/web_ui_data_source.h"
     18 #include "grit/browser_resources.h"
     19 
     20 // Whitelist of which preferences are possible targets for Salsa treatments.
     21 // If new preferences are added and they are to be used in an experiment, then
     22 // they must be added to this list as well to keep chrome://salsa from
     23 // changing arbitrary values.
     24 
     25 namespace {
     26 
     27 const char* kWhitelist[] = {
     28   prefs::kMaxSeparationForGestureTouchesInPixels,
     29   prefs::kFlingAccelerationCurveCoefficient0,
     30   prefs::kFlingAccelerationCurveCoefficient1,
     31   prefs::kFlingAccelerationCurveCoefficient2,
     32   prefs::kFlingAccelerationCurveCoefficient3,
     33   prefs::kTabScrubActivationDelayInMS,
     34   prefs::kOverscrollHorizontalThresholdComplete,
     35   prefs::kOverscrollVerticalThresholdComplete,
     36   prefs::kOverscrollMinimumThresholdStart,
     37   prefs::kOverscrollVerticalThresholdStart,
     38   prefs::kOverscrollHorizontalResistThreshold,
     39   prefs::kOverscrollVerticalResistThreshold,
     40   prefs::kFlingCurveTouchscreenAlpha,
     41   prefs::kFlingCurveTouchscreenBeta,
     42   prefs::kFlingCurveTouchscreenGamma,
     43   prefs::kFlingCurveTouchpadAlpha,
     44   prefs::kFlingCurveTouchpadBeta,
     45   prefs::kFlingCurveTouchpadGamma,
     46 };
     47 
     48 void RevertPreferences(PrefService* prefs,
     49                        std::map<int, const base::Value*>* vals) {
     50   std::map<int, const base::Value*>::const_iterator it;
     51   for (it = vals->begin(); it != vals->end(); ++it) {
     52     if (!prefs->FindPreference(kWhitelist[it->first]))
     53       continue;
     54 
     55     if (!it->second) {
     56       prefs->ClearPref(kWhitelist[it->first]);
     57     } else {
     58       prefs->Set(kWhitelist[it->first], *it->second);
     59       delete it->second;
     60     }
     61   }
     62 }
     63 
     64 } // namespace
     65 
     66 SalsaUI::SalsaUI(content::WebUI* web_ui)
     67     : content::WebUIController(web_ui) {
     68   // Set up the chrome://salsa source.
     69   content::WebUIDataSource* html_source =
     70       content::WebUIDataSource::Create(chrome::kChromeUISalsaHost);
     71 
     72   // Register callback handlers.
     73   web_ui->RegisterMessageCallback(
     74       "salsaSetPreferenceValue",
     75       base::Bind(&SalsaUI::SetPreferenceValue,
     76                  base::Unretained(this)));
     77   web_ui->RegisterMessageCallback(
     78       "salsaBackupPreferenceValue",
     79       base::Bind(&SalsaUI::BackupPreferenceValue,
     80                  base::Unretained(this)));
     81 
     82   // Add required resources.
     83   html_source->AddResourcePath("salsa.css", IDR_SALSA_CSS);
     84   html_source->AddResourcePath("salsa.js", IDR_SALSA_JS);
     85   html_source->SetDefaultResource(IDR_SALSA_HTML);
     86 
     87   Profile* profile = Profile::FromWebUI(web_ui);
     88   content::WebUIDataSource::Add(profile, html_source);
     89 }
     90 
     91 SalsaUI::~SalsaUI() {
     92   std::map<int, const base::Value*>* values_to_revert =
     93       new std::map<int, const base::Value*>;
     94   values_to_revert->swap(orig_values_);
     95 
     96   Profile* profile = Profile::FromWebUI(web_ui());
     97   PrefService* prefs = profile->GetPrefs();
     98 
     99   content::BrowserThread::PostTask(
    100       content::BrowserThread::UI,
    101       FROM_HERE,
    102       base::Bind(&RevertPreferences, prefs, base::Owned(values_to_revert))
    103     );
    104 }
    105 
    106 int SalsaUI::WhitelistIndex(const char* key) const {
    107   if (!key)
    108     return -1;
    109 
    110   int len = arraysize(kWhitelist);
    111   for (int i = 0; i < len; ++i) {
    112     if (!strcmp(key, kWhitelist[i]))
    113       return i;
    114   }
    115   return -1;
    116 }
    117 
    118 void SalsaUI::SetPreferenceValue(const base::ListValue* args) {
    119   std::string pref_name;
    120   const base::Value* value;
    121   if (!args->GetString(0, &pref_name) || !args->Get(1, &value))
    122     return;
    123 
    124   int index = WhitelistIndex(pref_name.c_str());
    125   if (index < 0)
    126     return;
    127 
    128   Profile* profile = Profile::FromWebUI(web_ui());
    129   PrefService* prefs = profile->GetPrefs();
    130   const PrefService::Preference* pref =
    131       prefs->FindPreference(kWhitelist[index]);
    132 
    133   if (pref->GetType() == value->GetType()) {
    134     prefs->Set(kWhitelist[index], *value);
    135   } else if (pref->GetType() == base::Value::TYPE_DOUBLE &&
    136              value->GetType() == base::Value::TYPE_INTEGER) {
    137     int int_val;
    138     if (!value->GetAsInteger(&int_val))
    139       return;
    140     base::FundamentalValue double_val(static_cast<double>(int_val));
    141     prefs->Set(kWhitelist[index], double_val);
    142   }
    143 }
    144 
    145 void SalsaUI::BackupPreferenceValue(const base::ListValue* args) {
    146   std::string pref_name;
    147   if (!args->GetString(0, &pref_name))
    148     return;
    149 
    150   int index = WhitelistIndex(pref_name.c_str());
    151   if (index < 0)
    152     return;
    153 
    154   Profile* profile = Profile::FromWebUI(web_ui());
    155   PrefService* prefs = profile->GetPrefs();
    156   const PrefService::Preference* pref =
    157       prefs->FindPreference(kWhitelist[index]);
    158 
    159   if (!pref)
    160     return;
    161 
    162   // Get our own copy of the user defined value or NULL if they are using the
    163   // default. You have to make a copy since they'll be used in the destructor
    164   // to restore the values and we need to make sure they're still around.
    165   orig_values_[index] =
    166       pref->IsDefaultValue() ? NULL : pref->GetValue()->DeepCopy();
    167 }
    168