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// Copyright (c) 2010 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/extensions/extension_pref_store.h"
#include "base/logging.h"
#include "base/values.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/prefs/pref_service.h"
#include "chrome/browser/profile.h"
#include "chrome/common/extensions/extension.h"
#include "chrome/common/notification_service.h"
ExtensionPrefStore::ExtensionPrefStore(Profile* profile,
PrefNotifier::PrefStoreType type)
: prefs_(new DictionaryValue()),
profile_(profile),
type_(type) {
RegisterObservers();
}
ExtensionPrefStore::~ExtensionPrefStore() {
STLDeleteElements(&extension_stack_);
notification_registrar_.RemoveAll();
}
void ExtensionPrefStore::InstallExtensionPref(Extension* extension,
const char* new_pref_path,
Value* new_pref_value) {
ExtensionStack::iterator i;
for (i = extension_stack_.begin(); i != extension_stack_.end(); ++i) {
if ((*i)->extension == extension)
break;
}
// If this extension is not already in the stack, add it. Otherwise, update
// or add the value of this preference, but don't change the extension's
// position in the stack. We store the extension even if this preference
// isn't registered with our PrefService, so that the ordering of extensions
// is consistent among all local-state and user ExtensionPrefStores.
PrefService* pref_service = GetPrefService();
// The pref_service may be NULL in unit testing.
bool is_registered_pref = (pref_service == NULL ||
pref_service->FindPreference(new_pref_path) != NULL);
PrefValueMap* pref_values;
if (i == extension_stack_.end()) {
pref_values = new PrefValueMap();
if (is_registered_pref)
(*pref_values)[new_pref_path] = new_pref_value;
ExtensionPrefs* extension_prefs = new ExtensionPrefs(extension,
pref_values);
extension_stack_.push_front(extension_prefs);
} else if (is_registered_pref) {
pref_values = (*i)->pref_values;
delete (*pref_values)[new_pref_path];
(*pref_values)[new_pref_path] = new_pref_value;
}
// Apply the preference to our local |prefs_| store.
UpdateOnePref(new_pref_path);
}
void ExtensionPrefStore::UninstallExtension(Extension* extension) {
// Remove this extension from the stack.
for (ExtensionStack::iterator i = extension_stack_.begin();
i != extension_stack_.end(); ++i) {
if ((*i)->extension == extension) {
scoped_ptr<ExtensionPrefs> to_be_deleted(*i);
extension_stack_.erase(i);
UpdatePrefs(to_be_deleted->pref_values);
return;
}
}
}
void ExtensionPrefStore::GetExtensionIDs(std::vector<std::string>* result) {
for (ExtensionStack::iterator i = extension_stack_.begin();
i != extension_stack_.end(); ++i) {
(*result).push_back((*i)->extension->id());
}
}
// This could be sped up by keeping track of which extension currently controls
// a given preference, among other optimizations. But probably fewer than 10
// installed extensions will be trying to control any preferences, so stick
// with this simpler algorithm until it causes a problem.
void ExtensionPrefStore::UpdateOnePref(const char* path) {
scoped_ptr<Value> old_value;
PrefService* pref_service = GetPrefService();
// There are at least two PrefServices, one for local state and one for
// user prefs. (See browser_main.cc.) Different preferences are registered
// in each; if this one doesn't have the desired pref registered, we ignore
// it and let the other one handle it.
// The pref_service may be NULL in unit testing.
if (pref_service) {
const PrefService::Preference* pref = pref_service->FindPreference(path);
if (!pref)
return;
old_value.reset(pref->GetValue()->DeepCopy());
}
// DictionaryValue::Set complains if a key is overwritten with the same
// value, so delete it first.
prefs_->Remove(path, NULL);
// Find the first extension that wants to set this pref and use its value.
for (ExtensionStack::iterator ext_iter = extension_stack_.begin();
ext_iter != extension_stack_.end(); ++ext_iter) {
PrefValueMap::iterator value_iter = (*ext_iter)->pref_values->find(path);
if (value_iter != (*ext_iter)->pref_values->end()) {
prefs_->Set(path, (*value_iter).second->DeepCopy());
break;
}
}
if (pref_service) {
pref_service->pref_notifier()->OnPreferenceSet(
path, type_, old_value.get());
}
}
void ExtensionPrefStore::UpdatePrefs(const PrefValueMap* pref_values) {
if (!pref_values)
return;
for (PrefValueMap::const_iterator i = pref_values->begin();
i != pref_values->end(); ++i) {
UpdateOnePref(i->first);
}
}
PrefService* ExtensionPrefStore::GetPrefService() {
if (profile_)
return profile_->GetPrefs();
return g_browser_process->local_state();
}
void ExtensionPrefStore::RegisterObservers() {
notification_registrar_.Add(this,
NotificationType::EXTENSION_PREF_CHANGED,
NotificationService::AllSources());
notification_registrar_.Add(this,
NotificationType::EXTENSION_UNLOADED,
NotificationService::AllSources());
}
void ExtensionPrefStore::Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details) {
switch (type.value) {
case NotificationType::EXTENSION_PREF_CHANGED: {
Profile* extension_profile = Source<Profile>(source).ptr();
// The ExtensionPrefStore for the local state watches all profiles.
if (!profile_ || profile_ == extension_profile) {
ExtensionPrefStore::ExtensionPrefDetails* data =
Details<ExtensionPrefStore::ExtensionPrefDetails>(details).ptr();
InstallExtensionPref(data->first, data->second.first,
data->second.second);
}
break;
}
case NotificationType::EXTENSION_UNLOADED: {
Profile* extension_profile = Source<Profile>(source).ptr();
Extension* extension = Details<Extension>(details).ptr();
// The ExtensionPrefStore for the local state watches all profiles.
if (profile_ == NULL || profile_ == extension_profile)
UninstallExtension(extension);
break;
}
default: {
NOTREACHED();
}
}
}
ExtensionPrefStore::ExtensionPrefs::ExtensionPrefs(Extension* extension,
PrefValueMap* values) : extension(extension), pref_values(values) {}
ExtensionPrefStore::ExtensionPrefs::~ExtensionPrefs() {
STLDeleteValues(pref_values);
delete pref_values;
}
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