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// Copyright (c) 2009 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/privacy_blacklist/blacklist_manager.h"
#include "base/message_loop.h"
#include "base/string_util.h"
#include "base/task.h"
#include "base/thread.h"
#include "chrome/browser/privacy_blacklist/blacklist.h"
#include "chrome/browser/privacy_blacklist/blacklist_io.h"
#include "chrome/browser/profile.h"
#include "chrome/common/chrome_constants.h"
#include "chrome/common/notification_service.h"
#include "chrome/common/notification_source.h"
#include "chrome/common/notification_type.h"
// Base class for tasks that use BlacklistManager. It ensures that the
// BlacklistManager won't get destroyed while we need it, and that it
// will be destroyed always on the same thread. That's why we use
// a custom Task instead of just NewRunnableMethod.
class BlacklistManagerTask : public Task {
public:
explicit BlacklistManagerTask(BlacklistManager* manager)
: original_loop_(MessageLoop::current()),
manager_(manager) {
DCHECK(original_loop_);
manager->AddRef();
}
~BlacklistManagerTask() {
original_loop_->ReleaseSoon(FROM_HERE, manager_);
}
protected:
BlacklistManager* blacklist_manager() const { return manager_; }
MessageLoop* original_loop_;
private:
BlacklistManager* manager_;
DISALLOW_COPY_AND_ASSIGN(BlacklistManagerTask);
};
BlacklistPathProvider::~BlacklistPathProvider() {
}
class BlacklistManager::CompileBlacklistTask : public BlacklistManagerTask {
public:
CompileBlacklistTask(BlacklistManager* manager,
const FilePath& destination_blacklist,
const std::vector<FilePath>& source_blacklists)
: BlacklistManagerTask(manager),
destination_blacklist_(destination_blacklist),
source_blacklists_(source_blacklists) {
}
virtual void Run() {
bool success = true;
Blacklist blacklist;
std::string error_string;
for (std::vector<FilePath>::const_iterator i = source_blacklists_.begin();
i != source_blacklists_.end(); ++i) {
if (!BlacklistIO::ReadText(&blacklist, *i, &error_string)) {
success = false;
break;
}
}
// Only overwrite the current compiled blacklist if we read all source
// files successfully.
if (success)
success = BlacklistIO::WriteBinary(&blacklist, destination_blacklist_);
original_loop_->PostTask(
FROM_HERE,
NewRunnableMethod(blacklist_manager(),
&BlacklistManager::OnBlacklistCompilationFinished,
success));
}
private:
FilePath destination_blacklist_;
std::vector<FilePath> source_blacklists_;
DISALLOW_COPY_AND_ASSIGN(CompileBlacklistTask);
};
class BlacklistManager::ReadBlacklistTask : public BlacklistManagerTask {
public:
ReadBlacklistTask(BlacklistManager* manager,
const FilePath& compiled_blacklist,
const std::vector<FilePath>& transient_blacklists)
: BlacklistManagerTask(manager),
compiled_blacklist_(compiled_blacklist),
transient_blacklists_(transient_blacklists) {
}
virtual void Run() {
scoped_ptr<Blacklist> blacklist(new Blacklist);
if (!BlacklistIO::ReadBinary(blacklist.get(), compiled_blacklist_)) {
ReportReadResult(NULL);
return;
}
std::string error_string;
std::vector<FilePath>::const_iterator i;
for (i = transient_blacklists_.begin();
i != transient_blacklists_.end(); ++i) {
if (!BlacklistIO::ReadText(blacklist.get(), *i, &error_string)) {
ReportReadResult(NULL);
return;
}
}
ReportReadResult(blacklist.release());
}
private:
void ReportReadResult(Blacklist* blacklist) {
original_loop_->PostTask(
FROM_HERE, NewRunnableMethod(blacklist_manager(),
&BlacklistManager::OnBlacklistReadFinished,
blacklist));
}
FilePath compiled_blacklist_;
std::vector<FilePath> transient_blacklists_;
DISALLOW_COPY_AND_ASSIGN(ReadBlacklistTask);
};
BlacklistManager::BlacklistManager(Profile* profile,
BlacklistPathProvider* path_provider,
base::Thread* backend_thread)
: first_read_finished_(false),
profile_(profile),
compiled_blacklist_path_(
profile->GetPath().Append(chrome::kPrivacyBlacklistFileName)),
path_provider_(path_provider),
backend_thread_(backend_thread) {
registrar_.Add(this,
NotificationType::BLACKLIST_PATH_PROVIDER_UPDATED,
Source<Profile>(profile));
ReadBlacklist();
}
void BlacklistManager::Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details) {
DCHECK(type == NotificationType::BLACKLIST_PATH_PROVIDER_UPDATED);
CompileBlacklist();
}
void BlacklistManager::CompileBlacklist() {
DCHECK(CalledOnValidThread());
RunTaskOnBackendThread(new CompileBlacklistTask(
this, compiled_blacklist_path_,
path_provider_->GetPersistentBlacklistPaths()));
}
void BlacklistManager::ReadBlacklist() {
DCHECK(CalledOnValidThread());
RunTaskOnBackendThread(new ReadBlacklistTask(
this, compiled_blacklist_path_,
path_provider_->GetTransientBlacklistPaths()));
}
void BlacklistManager::OnBlacklistCompilationFinished(bool success) {
DCHECK(CalledOnValidThread());
if (success) {
ReadBlacklist();
} else {
string16 error_message(ASCIIToUTF16("Blacklist compilation failed."));
NotificationService::current()->Notify(
NotificationType::BLACKLIST_MANAGER_ERROR,
Source<Profile>(profile_),
Details<string16>(&error_message));
}
}
void BlacklistManager::OnBlacklistReadFinished(Blacklist* blacklist) {
DCHECK(CalledOnValidThread());
if (!blacklist) {
if (!first_read_finished_) {
// If we're loading for the first time, the compiled blacklist could
// just not exist. Try compiling it once.
first_read_finished_ = true;
CompileBlacklist();
} else {
string16 error_message(ASCIIToUTF16("Blacklist read failed."));
NotificationService::current()->Notify(
NotificationType::BLACKLIST_MANAGER_ERROR,
Source<Profile>(profile_),
Details<string16>(&error_message));
}
return;
}
first_read_finished_ = true;
compiled_blacklist_.reset(blacklist);
NotificationService::current()->Notify(
NotificationType::BLACKLIST_MANAGER_BLACKLIST_READ_FINISHED,
Source<Profile>(profile_),
Details<Blacklist>(blacklist));
}
void BlacklistManager::RunTaskOnBackendThread(Task* task) {
if (backend_thread_) {
backend_thread_->message_loop()->PostTask(FROM_HERE, task);
} else {
task->Run();
delete task;
}
}
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