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// Copyright (c) 2011 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_settings_frontend.h"
#include "base/bind.h"
#include "base/file_path.h"
#include "chrome/browser/extensions/extension_event_names.h"
#include "chrome/browser/extensions/extension_event_router.h"
#include "chrome/browser/extensions/extension_service.h"
#include "chrome/browser/extensions/extension_settings_backend.h"
#include "chrome/browser/profiles/profile.h"
#include "content/browser/browser_thread.h"
#include "content/public/browser/notification_service.h"
class ExtensionSettingsFrontend::DefaultObserver
: public ExtensionSettingsObserver {
public:
explicit DefaultObserver(Profile* profile) : target_profile_(profile) {}
virtual ~DefaultObserver() {}
virtual void OnSettingsChanged(
const Profile* origin_profile,
const std::string& extension_id,
const ExtensionSettingChanges& changes) OVERRIDE {
if (origin_profile != target_profile_) {
target_profile_->GetExtensionEventRouter()->DispatchEventToExtension(
extension_id,
extension_event_names::kOnSettingsChanged,
// This is the list of function arguments to pass to the onChanged
// handler of extensions, a single argument with the list of changes.
std::string("[") + changes.ToJson() + "]",
target_profile_,
GURL());
}
}
private:
Profile* target_profile_;
};
class ExtensionSettingsFrontend::Core
: public base::RefCountedThreadSafe<Core> {
public:
explicit Core(
const scoped_refptr<ObserverListThreadSafe<ExtensionSettingsObserver> >&
observers)
: observers_(observers), backend_(NULL) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
}
// Does any FILE thread specific initialization, such as construction of
// |backend_|. Must be called before any call to
// RunWithBackendOnFileThread().
void InitOnFileThread(const FilePath& base_path) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
DCHECK(!backend_);
backend_ = new ExtensionSettingsBackend(base_path, observers_);
}
// Runs |callback| with the extension backend.
void RunWithBackendOnFileThread(const BackendCallback& callback) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
DCHECK(backend_);
callback.Run(backend_);
}
private:
virtual ~Core() {
if (BrowserThread::CurrentlyOn(BrowserThread::FILE)) {
delete backend_;
} else if (BrowserThread::CurrentlyOn(BrowserThread::UI)) {
BrowserThread::DeleteSoon(BrowserThread::FILE, FROM_HERE, backend_);
} else {
NOTREACHED();
}
}
friend class base::RefCountedThreadSafe<Core>;
// Observers to settings changes (thread safe).
scoped_refptr<ObserverListThreadSafe<ExtensionSettingsObserver> >
observers_;
// Lives on the FILE thread.
ExtensionSettingsBackend* backend_;
DISALLOW_COPY_AND_ASSIGN(Core);
};
ExtensionSettingsFrontend::ExtensionSettingsFrontend(Profile* profile)
: profile_(profile),
observers_(new ObserverListThreadSafe<ExtensionSettingsObserver>()),
core_(new ExtensionSettingsFrontend::Core(observers_.get())) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
DCHECK(!profile->IsOffTheRecord());
// This class listens to all PROFILE_{CREATED,DESTROYED} events but we're
// only interested in those for the original Profile given on construction
// and its incognito version.
registrar_.Add(this, chrome::NOTIFICATION_PROFILE_CREATED,
content::NotificationService::AllBrowserContextsAndSources());
registrar_.Add(this, chrome::NOTIFICATION_PROFILE_DESTROYED,
content::NotificationService::AllBrowserContextsAndSources());
OnProfileCreated(profile);
BrowserThread::PostTask(
BrowserThread::FILE,
FROM_HERE,
base::Bind(
&ExtensionSettingsFrontend::Core::InitOnFileThread,
core_.get(),
profile->GetPath().AppendASCII(
ExtensionService::kSettingsDirectoryName)));
}
ExtensionSettingsFrontend::~ExtensionSettingsFrontend() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
}
void ExtensionSettingsFrontend::RunWithBackend(
const BackendCallback& callback) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
BrowserThread::PostTask(
BrowserThread::FILE,
FROM_HERE,
base::Bind(
&ExtensionSettingsFrontend::Core::RunWithBackendOnFileThread,
core_.get(),
callback));
}
void ExtensionSettingsFrontend::AddObserver(
ExtensionSettingsObserver* observer) {
observers_->AddObserver(observer);
}
void ExtensionSettingsFrontend::RemoveObserver(
ExtensionSettingsObserver* observer) {
observers_->RemoveObserver(observer);
}
void ExtensionSettingsFrontend::Observe(
int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
switch (type) {
case chrome::NOTIFICATION_PROFILE_CREATED:
OnProfileCreated(content::Source<Profile>(source).ptr());
break;
case chrome::NOTIFICATION_PROFILE_DESTROYED:
OnProfileDestroyed(content::Source<Profile>(source).ptr());
break;
default:
NOTREACHED();
}
}
void ExtensionSettingsFrontend::OnProfileCreated(Profile* new_profile) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (new_profile == profile_) {
ClearDefaultObserver(&original_profile_observer);
SetDefaultObserver(new_profile, &original_profile_observer);
} else if (new_profile->GetOriginalProfile() == profile_) {
DCHECK(new_profile->IsOffTheRecord());
ClearDefaultObserver(&incognito_profile_observer_);
SetDefaultObserver(new_profile, &incognito_profile_observer_);
}
}
void ExtensionSettingsFrontend::OnProfileDestroyed(Profile* old_profile) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (old_profile == profile_) {
ClearDefaultObserver(&original_profile_observer);
} else if (old_profile->GetOriginalProfile() == profile_) {
DCHECK(old_profile->IsOffTheRecord());
ClearDefaultObserver(&incognito_profile_observer_);
}
}
void ExtensionSettingsFrontend::SetDefaultObserver(
Profile* profile, scoped_ptr<DefaultObserver>* observer) {
DCHECK(!observer->get());
observer->reset(new DefaultObserver(profile));
AddObserver(observer->get());
}
void ExtensionSettingsFrontend::ClearDefaultObserver(
scoped_ptr<DefaultObserver>* observer) {
if (observer->get()) {
RemoveObserver(observer->get());
observer->reset();
}
}
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