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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 "webkit/fileapi/file_system_origin_database.h"
#include "base/format_macros.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/string_number_conversions.h"
#include "base/stringprintf.h"
#include "base/string_util.h"
#include "base/sys_string_conversions.h"
#include "third_party/leveldatabase/src/include/leveldb/iterator.h"
#include "third_party/leveldatabase/src/include/leveldb/write_batch.h"
namespace {
const char kOriginKeyPrefix[] = "ORIGIN:";
const char kLastPathKey[] = "LAST_PATH";
std::string OriginToOriginKey(const std::string& origin) {
std::string key(kOriginKeyPrefix);
return key + origin;
}
const char* LastPathKey() {
return kLastPathKey;
}
}
namespace fileapi {
FileSystemOriginDatabase::OriginRecord::OriginRecord() {
}
FileSystemOriginDatabase::OriginRecord::OriginRecord(
const std::string& origin_in, const FilePath& path_in)
: origin(origin_in), path(path_in) {
}
FileSystemOriginDatabase::OriginRecord::~OriginRecord() {
}
FileSystemOriginDatabase::FileSystemOriginDatabase(const FilePath& path) {
#if defined(OS_POSIX)
path_ = path.value();
#elif defined(OS_WIN)
path_ = base::SysWideToUTF8(path.value());
#endif
}
FileSystemOriginDatabase::~FileSystemOriginDatabase() {
}
bool FileSystemOriginDatabase::Init() {
if (db_.get())
return true;
leveldb::Options options;
options.create_if_missing = true;
leveldb::DB* db;
leveldb::Status status = leveldb::DB::Open(options, path_, &db);
if (status.ok()) {
db_.reset(db);
return true;
}
HandleError(FROM_HERE, status);
return false;
}
void FileSystemOriginDatabase::HandleError(
const tracked_objects::Location& from_here, leveldb::Status status) {
db_.reset();
LOG(ERROR) << "FileSystemOriginDatabase failed at: "
<< from_here.ToString() << " with error: " << status.ToString();
}
bool FileSystemOriginDatabase::HasOriginPath(const std::string& origin) {
if (!Init())
return false;
if (origin.empty())
return false;
std::string path;
leveldb::Status status =
db_->Get(leveldb::ReadOptions(), OriginToOriginKey(origin), &path);
if (status.ok())
return true;
if (status.IsNotFound())
return false;
HandleError(FROM_HERE, status);
return false;
}
bool FileSystemOriginDatabase::GetPathForOrigin(
const std::string& origin, FilePath* directory) {
if (!Init())
return false;
DCHECK(directory);
if (origin.empty())
return false;
std::string path_string;
std::string origin_key = OriginToOriginKey(origin);
leveldb::Status status =
db_->Get(leveldb::ReadOptions(), origin_key, &path_string);
if (status.IsNotFound()) {
int last_path_number;
if (!GetLastPathNumber(&last_path_number))
return false;
path_string = StringPrintf("%03u", last_path_number + 1);
// store both back as a single transaction
leveldb::WriteBatch batch;
batch.Put(LastPathKey(), path_string);
batch.Put(origin_key, path_string);
status = db_->Write(leveldb::WriteOptions(), &batch);
if (!status.ok()) {
HandleError(FROM_HERE, status);
return false;
}
}
if (status.ok()) {
#if defined(OS_POSIX)
*directory = FilePath(path_string);
#elif defined(OS_WIN)
*directory = FilePath(base::SysUTF8ToWide(path_string));
#endif
return true;
}
HandleError(FROM_HERE, status);
return false;
}
bool FileSystemOriginDatabase::RemovePathForOrigin(const std::string& origin) {
if (!Init())
return false;
leveldb::Status status =
db_->Delete(leveldb::WriteOptions(), OriginToOriginKey(origin));
if (status.ok() || status.IsNotFound())
return true;
HandleError(FROM_HERE, status);
return false;
}
bool FileSystemOriginDatabase::ListAllOrigins(
std::vector<OriginRecord>* origins) {
if (!Init())
return false;
DCHECK(origins);
scoped_ptr<leveldb::Iterator> iter(db_->NewIterator(leveldb::ReadOptions()));
std::string origin_key_prefix = OriginToOriginKey("");
iter->Seek(origin_key_prefix);
origins->clear();
while(iter->Valid() &&
StartsWithASCII(iter->key().ToString(), origin_key_prefix, true)) {
std::string origin =
iter->key().ToString().substr(origin_key_prefix.length());
#if defined(OS_POSIX)
FilePath path = FilePath(iter->value().ToString());
#elif defined(OS_WIN)
FilePath path = FilePath(base::SysUTF8ToWide(iter->value().ToString()));
#endif
origins->push_back(OriginRecord(origin, path));
iter->Next();
}
return true;
}
void FileSystemOriginDatabase::DropDatabase() {
db_.reset();
}
bool FileSystemOriginDatabase::GetLastPathNumber(int* number) {
if (!Init())
return false;
DCHECK(number);
std::string number_string;
leveldb::Status status =
db_->Get(leveldb::ReadOptions(), LastPathKey(), &number_string);
if (status.ok())
return base::StringToInt(number_string, number);
if (!status.IsNotFound()) {
HandleError(FROM_HERE, status);
return false;
}
// Verify that this is a totally new database, and initialize it.
scoped_ptr<leveldb::Iterator> iter(db_->NewIterator(leveldb::ReadOptions()));
iter->SeekToFirst();
if (iter->Valid()) { // DB was not empty, but had no last path number!
LOG(ERROR) << "File system origin database is corrupt!";
return false;
}
// This is always the first write into the database. If we ever add a
// version number, they should go in in a single transaction.
status =
db_->Put(leveldb::WriteOptions(), LastPathKey(), std::string("-1"));
if (!status.ok()) {
HandleError(FROM_HERE, status);
return false;
}
*number = -1;
return true;
}
} // namespace fileapi
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