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// 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/content_settings/content_settings_default_provider.h"
#include <string>
#include <vector>
#include "base/auto_reset.h"
#include "base/basictypes.h"
#include "base/command_line.h"
#include "base/metrics/histogram.h"
#include "chrome/browser/content_settings/content_settings_rule.h"
#include "chrome/browser/content_settings/content_settings_utils.h"
#include "chrome/browser/prefs/pref_service.h"
#include "chrome/browser/prefs/scoped_user_pref_update.h"
#include "chrome/common/chrome_notification_types.h"
#include "chrome/common/content_settings.h"
#include "chrome/common/content_settings_pattern.h"
#include "chrome/common/pref_names.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/notification_details.h"
#include "content/public/browser/notification_source.h"
#include "content/public/browser/user_metrics.h"
#include "googleurl/src/gurl.h"
using content::BrowserThread;
using content::UserMetricsAction;
namespace {
// The default setting for each content type.
const ContentSetting kDefaultSettings[] = {
CONTENT_SETTING_ALLOW, // CONTENT_SETTINGS_TYPE_COOKIES
CONTENT_SETTING_ALLOW, // CONTENT_SETTINGS_TYPE_IMAGES
CONTENT_SETTING_ALLOW, // CONTENT_SETTINGS_TYPE_JAVASCRIPT
CONTENT_SETTING_ALLOW, // CONTENT_SETTINGS_TYPE_PLUGINS
CONTENT_SETTING_BLOCK, // CONTENT_SETTINGS_TYPE_POPUPS
CONTENT_SETTING_ASK, // CONTENT_SETTINGS_TYPE_GEOLOCATION
CONTENT_SETTING_ASK, // CONTENT_SETTINGS_TYPE_NOTIFICATIONS
CONTENT_SETTING_ASK, // CONTENT_SETTINGS_TYPE_INTENTS
CONTENT_SETTING_DEFAULT, // CONTENT_SETTINGS_TYPE_AUTO_SELECT_CERTIFICATE
CONTENT_SETTING_ASK, // CONTENT_SETTINGS_TYPE_FULLSCREEN
CONTENT_SETTING_ASK, // CONTENT_SETTINGS_TYPE_MOUSELOCK
CONTENT_SETTING_DEFAULT, // CONTENT_SETTINGS_TYPE_MIXEDSCRIPT
CONTENT_SETTING_ASK, // CONTENT_SETTINGS_TYPE_MEDIASTREAM
};
COMPILE_ASSERT(arraysize(kDefaultSettings) == CONTENT_SETTINGS_NUM_TYPES,
default_settings_incorrect_size);
} // namespace
namespace content_settings {
namespace {
class DefaultRuleIterator : public RuleIterator {
public:
explicit DefaultRuleIterator(const base::Value* value) {
if (value)
value_.reset(value->DeepCopy());
}
bool HasNext() const {
return value_.get() != NULL;
}
Rule Next() {
DCHECK(value_.get());
return Rule(ContentSettingsPattern::Wildcard(),
ContentSettingsPattern::Wildcard(),
value_.release());
}
private:
scoped_ptr<base::Value> value_;
};
} // namespace
// static
void DefaultProvider::RegisterUserPrefs(PrefService* prefs) {
// The registration of the preference prefs::kDefaultContentSettings should
// also include the default values for default content settings. This allows
// functional tests to get default content settings by reading the preference
// prefs::kDefaultContentSettings via pyauto.
// TODO(markusheintz): Write pyauto hooks for the content settings map as
// content settings should be read from the host content settings map.
DictionaryValue* default_content_settings = new DictionaryValue();
prefs->RegisterDictionaryPref(prefs::kDefaultContentSettings,
default_content_settings,
PrefService::SYNCABLE_PREF);
// Obsolete prefs, for migrations:
prefs->RegisterIntegerPref(
prefs::kDesktopNotificationDefaultContentSetting,
kDefaultSettings[CONTENT_SETTINGS_TYPE_NOTIFICATIONS],
PrefService::SYNCABLE_PREF);
prefs->RegisterIntegerPref(
prefs::kGeolocationDefaultContentSetting,
kDefaultSettings[CONTENT_SETTINGS_TYPE_GEOLOCATION],
PrefService::UNSYNCABLE_PREF);
}
DefaultProvider::DefaultProvider(PrefService* prefs, bool incognito)
: prefs_(prefs),
is_incognito_(incognito),
updating_preferences_(false) {
DCHECK(prefs_);
MigrateObsoleteNotificationPref();
MigrateObsoleteGeolocationPref();
// Read global defaults.
ReadDefaultSettings(true);
UMA_HISTOGRAM_ENUMERATION(
"ContentSettings.DefaultCookiesSetting",
ValueToContentSetting(
default_settings_[CONTENT_SETTINGS_TYPE_COOKIES].get()),
CONTENT_SETTING_NUM_SETTINGS);
UMA_HISTOGRAM_ENUMERATION(
"ContentSettings.DefaultImagesSetting",
ValueToContentSetting(
default_settings_[CONTENT_SETTINGS_TYPE_IMAGES].get()),
CONTENT_SETTING_NUM_SETTINGS);
UMA_HISTOGRAM_ENUMERATION(
"ContentSettings.DefaultJavaScriptSetting",
ValueToContentSetting(
default_settings_[CONTENT_SETTINGS_TYPE_JAVASCRIPT].get()),
CONTENT_SETTING_NUM_SETTINGS);
UMA_HISTOGRAM_ENUMERATION(
"ContentSettings.DefaultPluginsSetting",
ValueToContentSetting(
default_settings_[CONTENT_SETTINGS_TYPE_PLUGINS].get()),
CONTENT_SETTING_NUM_SETTINGS);
UMA_HISTOGRAM_ENUMERATION(
"ContentSettings.DefaultPopupsSetting",
ValueToContentSetting(
default_settings_[CONTENT_SETTINGS_TYPE_POPUPS].get()),
CONTENT_SETTING_NUM_SETTINGS);
UMA_HISTOGRAM_ENUMERATION(
"ContentSettings.DefaultLocationSetting",
ValueToContentSetting(
default_settings_[CONTENT_SETTINGS_TYPE_GEOLOCATION].get()),
CONTENT_SETTING_NUM_SETTINGS);
UMA_HISTOGRAM_ENUMERATION(
"ContentSettings.DefaultNotificationsSetting",
ValueToContentSetting(
default_settings_[CONTENT_SETTINGS_TYPE_NOTIFICATIONS].get()),
CONTENT_SETTING_NUM_SETTINGS);
UMA_HISTOGRAM_ENUMERATION(
"ContentSettings.DefaultHandlersSetting",
ValueToContentSetting(
default_settings_[CONTENT_SETTINGS_TYPE_INTENTS].get()),
CONTENT_SETTING_NUM_SETTINGS);
UMA_HISTOGRAM_ENUMERATION(
"ContentSettings.DefaultMouseCursorSetting",
ValueToContentSetting(
default_settings_[CONTENT_SETTINGS_TYPE_MOUSELOCK].get()),
CONTENT_SETTING_NUM_SETTINGS);
UMA_HISTOGRAM_ENUMERATION(
"ContentSettings.DefaultMediaStreamSetting",
ValueToContentSetting(
default_settings_[CONTENT_SETTINGS_TYPE_MEDIASTREAM].get()),
CONTENT_SETTING_NUM_SETTINGS);
pref_change_registrar_.Init(prefs_);
pref_change_registrar_.Add(prefs::kDefaultContentSettings, this);
pref_change_registrar_.Add(prefs::kGeolocationDefaultContentSetting, this);
}
DefaultProvider::~DefaultProvider() {
}
bool DefaultProvider::SetWebsiteSetting(
const ContentSettingsPattern& primary_pattern,
const ContentSettingsPattern& secondary_pattern,
ContentSettingsType content_type,
const ResourceIdentifier& resource_identifier,
Value* in_value) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
DCHECK(prefs_);
// Ignore non default settings
if (primary_pattern != ContentSettingsPattern::Wildcard() ||
secondary_pattern != ContentSettingsPattern::Wildcard()) {
return false;
}
// The default settings may not be directly modified for OTR sessions.
// Instead, they are synced to the main profile's setting.
if (is_incognito_)
return false;
// Put |in_value| in a scoped pointer to ensure that it gets cleaned up
// properly if we don't pass on the ownership.
scoped_ptr<base::Value> value(in_value);
{
AutoReset<bool> auto_reset(&updating_preferences_, true);
// Keep the obsolete pref in sync as long as backwards compatibility is
// required. This is required to keep sync working correctly.
if (content_type == CONTENT_SETTINGS_TYPE_GEOLOCATION) {
if (value.get()) {
prefs_->Set(prefs::kGeolocationDefaultContentSetting, *value);
} else {
prefs_->ClearPref(prefs::kGeolocationDefaultContentSetting);
}
}
// |DefaultProvider| should not send any notifications when holding
// |lock_|. |DictionaryPrefUpdate| destructor and
// |PrefService::SetInteger()| send out notifications. As a response, the
// upper layers may call |GetAllContentSettingRules| which acquires |lock_|
// again.
DictionaryPrefUpdate update(prefs_, prefs::kDefaultContentSettings);
DictionaryValue* default_settings_dictionary = update.Get();
base::AutoLock lock(lock_);
if (value.get() == NULL ||
ValueToContentSetting(value.get()) == kDefaultSettings[content_type]) {
// If |value| is NULL we need to reset the default setting the the
// hardcoded default.
default_settings_[content_type].reset(
Value::CreateIntegerValue(kDefaultSettings[content_type]));
// Remove the corresponding pref entry since the hardcoded default value
// is used.
default_settings_dictionary->RemoveWithoutPathExpansion(
GetTypeName(content_type), NULL);
} else {
default_settings_[content_type].reset(value->DeepCopy());
// Transfer ownership of |value| to the |default_settings_dictionary|.
default_settings_dictionary->SetWithoutPathExpansion(
GetTypeName(content_type), value.release());
}
}
NotifyObservers(ContentSettingsPattern(),
ContentSettingsPattern(),
content_type,
std::string());
return true;
}
RuleIterator* DefaultProvider::GetRuleIterator(
ContentSettingsType content_type,
const ResourceIdentifier& resource_identifier,
bool incognito) const {
base::AutoLock lock(lock_);
if (resource_identifier.empty()) {
ValueMap::const_iterator it(default_settings_.find(content_type));
if (it != default_settings_.end()) {
return new DefaultRuleIterator(it->second.get());
}
NOTREACHED();
}
return new EmptyRuleIterator();
}
void DefaultProvider::ClearAllContentSettingsRules(
ContentSettingsType content_type) {
// TODO(markusheintz): This method is only called when the
// |DesktopNotificationService| calls |ClearAllSettingsForType| method on the
// |HostContentSettingsMap|. Don't implement this method yet, otherwise the
// default notification settings will be cleared as well.
}
void DefaultProvider::ShutdownOnUIThread() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
DCHECK(prefs_);
RemoveAllObservers();
pref_change_registrar_.RemoveAll();
prefs_ = NULL;
}
void DefaultProvider::Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (type == chrome::NOTIFICATION_PREF_CHANGED) {
DCHECK_EQ(prefs_, content::Source<PrefService>(source).ptr());
if (updating_preferences_)
return;
std::string* name = content::Details<std::string>(details).ptr();
if (*name == prefs::kDefaultContentSettings) {
ReadDefaultSettings(true);
} else if (*name == prefs::kGeolocationDefaultContentSetting) {
MigrateObsoleteGeolocationPref();
// Return and don't send a notifications. Migrating the obsolete
// geolocation pref will change the prefs::kDefaultContentSettings and
// cause the notification to be fired.
return;
} else {
NOTREACHED() << "Unexpected preference observed";
return;
}
NotifyObservers(ContentSettingsPattern(),
ContentSettingsPattern(),
CONTENT_SETTINGS_TYPE_DEFAULT,
std::string());
} else {
NOTREACHED() << "Unexpected notification";
}
}
void DefaultProvider::ReadDefaultSettings(bool overwrite) {
base::AutoLock lock(lock_);
const DictionaryValue* default_settings_dictionary =
prefs_->GetDictionary(prefs::kDefaultContentSettings);
if (overwrite)
default_settings_.clear();
// Careful: The returned value could be NULL if the pref has never been set.
if (default_settings_dictionary)
GetSettingsFromDictionary(default_settings_dictionary);
ForceDefaultsToBeExplicit();
}
void DefaultProvider::ForceDefaultsToBeExplicit() {
for (int i = 0; i < CONTENT_SETTINGS_NUM_TYPES; ++i) {
ContentSettingsType type = ContentSettingsType(i);
if (!default_settings_[type].get() &&
kDefaultSettings[i] != CONTENT_SETTING_DEFAULT) {
default_settings_[type].reset(
Value::CreateIntegerValue(kDefaultSettings[i]));
}
}
}
void DefaultProvider::GetSettingsFromDictionary(
const DictionaryValue* dictionary) {
for (DictionaryValue::key_iterator i(dictionary->begin_keys());
i != dictionary->end_keys(); ++i) {
const std::string& content_type(*i);
for (size_t type = 0; type < CONTENT_SETTINGS_NUM_TYPES; ++type) {
if (content_type == GetTypeName(ContentSettingsType(type))) {
int int_value = CONTENT_SETTING_DEFAULT;
bool found = dictionary->GetIntegerWithoutPathExpansion(content_type,
&int_value);
DCHECK(found);
default_settings_[ContentSettingsType(type)].reset(
Value::CreateIntegerValue(int_value));
break;
}
}
}
// Migrate obsolete cookie prompt mode.
if (ValueToContentSetting(
default_settings_[CONTENT_SETTINGS_TYPE_COOKIES].get()) ==
CONTENT_SETTING_ASK) {
default_settings_[CONTENT_SETTINGS_TYPE_COOKIES].reset(
Value::CreateIntegerValue(CONTENT_SETTING_BLOCK));
}
}
void DefaultProvider::MigrateObsoleteNotificationPref() {
if (prefs_->HasPrefPath(prefs::kDesktopNotificationDefaultContentSetting)) {
const base::Value* value = prefs_->FindPreference(
prefs::kDesktopNotificationDefaultContentSetting)->GetValue();
// Do not clear the old preference yet as long as we need to maintain
// backward compatibility.
SetWebsiteSetting(
ContentSettingsPattern::Wildcard(),
ContentSettingsPattern::Wildcard(),
CONTENT_SETTINGS_TYPE_NOTIFICATIONS,
std::string(),
value->DeepCopy());
prefs_->ClearPref(prefs::kDesktopNotificationDefaultContentSetting);
}
}
void DefaultProvider::MigrateObsoleteGeolocationPref() {
if (prefs_->HasPrefPath(prefs::kGeolocationDefaultContentSetting)) {
const base::Value* value = prefs_->FindPreference(
prefs::kGeolocationDefaultContentSetting)->GetValue();
// Do not clear the old preference yet as long as we need to maintain
// backward compatibility.
SetWebsiteSetting(
ContentSettingsPattern::Wildcard(),
ContentSettingsPattern::Wildcard(),
CONTENT_SETTINGS_TYPE_GEOLOCATION,
std::string(),
value->DeepCopy());
}
}
} // namespace content_settings
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