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// Copyright (c) 2012 The Chromium OS 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 "mtpd_server_impl.h"
#include <base/logging.h>
#include <base/rand_util.h>
#include <base/stl_util.h>
#include "build_config.h"
#include "service_constants.h"
// TODO(thestig) Merge these once libchrome catches up to Chromium's base,
// or when mtpd moves into its own repo. http://crbug.com/221123
#if defined(CROS_BUILD)
#include <base/string_number_conversions.h>
#else
#include <base/strings/string_number_conversions.h>
#endif
namespace mtpd {
namespace {
// Maximum number of bytes to read from the device at one time. This is set low
// enough such that a reasonable device can read this much data before D-Bus
// times out.
const uint32_t kMaxReadCount = 1024 * 1024;
const char kInvalidHandleErrorMessage[] = "Invalid handle ";
void SetInvalidHandleError(const std::string& handle, DBus::Error* error) {
std::string error_msg = kInvalidHandleErrorMessage + handle;
error->set(kMtpdServiceError, error_msg.c_str());
}
template<typename ReturnType>
ReturnType InvalidHandle(const std::string& handle, DBus::Error* error) {
SetInvalidHandleError(handle, error);
return ReturnType();
}
} // namespace
MtpdServer::MtpdServer(DBus::Connection& connection)
: DBus::ObjectAdaptor(connection, kMtpdServicePath),
device_manager_(this) {
}
MtpdServer::~MtpdServer() {
}
std::vector<std::string> MtpdServer::EnumerateStorages(DBus::Error& error) {
return device_manager_.EnumerateStorages();
}
std::vector<uint8_t> MtpdServer::GetStorageInfo(const std::string& storageName,
DBus::Error& error) {
const StorageInfo* info = device_manager_.GetStorageInfo(storageName);
return info ? info->ToDBusFormat() : StorageInfo().ToDBusFormat();
}
std::string MtpdServer::OpenStorage(const std::string& storageName,
const std::string& mode,
DBus::Error& error) {
// TODO(thestig) Handle read-write and possibly append-only modes.
if (mode != kReadOnlyMode) {
std::string error_msg = "Cannot open " + storageName + " in mode: " + mode;
error.set(kMtpdServiceError, error_msg.c_str());
return std::string();
}
if (!device_manager_.HasStorage(storageName)) {
std::string error_msg = "Cannot open unknown storage " + storageName;
error.set(kMtpdServiceError, error_msg.c_str());
return std::string();
}
std::string id;
uint32_t random_data[4];
do {
base::RandBytes(random_data, sizeof(random_data));
id = base::HexEncode(random_data, sizeof(random_data));
} while (ContainsKey(handle_map_, id));
handle_map_.insert(std::make_pair(id, storageName));
return id;
}
void MtpdServer::CloseStorage(const std::string& handle, DBus::Error& error) {
if (handle_map_.erase(handle) == 0)
SetInvalidHandleError(handle, &error);
}
std::vector<uint8_t> MtpdServer::ReadDirectoryByPath(
const std::string& handle,
const std::string& filePath,
DBus::Error& error) {
std::string storage_name = LookupHandle(handle);
if (storage_name.empty()) {
SetInvalidHandleError(handle, &error);
return FileEntry::EmptyFileEntriesToDBusFormat();
}
std::vector<FileEntry> directory_listing;
if (!device_manager_.ReadDirectoryByPath(storage_name,
filePath,
&directory_listing)) {
error.set(kMtpdServiceError, "ReadDirectoryByPath failed");
return FileEntry::EmptyFileEntriesToDBusFormat();
}
return FileEntry::FileEntriesToDBusFormat(directory_listing);
}
std::vector<uint8_t> MtpdServer::ReadDirectoryById(const std::string& handle,
const uint32_t& fileId,
DBus::Error& error) {
std::string storage_name = LookupHandle(handle);
if (storage_name.empty()) {
SetInvalidHandleError(handle, &error);
return FileEntry::EmptyFileEntriesToDBusFormat();
}
std::vector<FileEntry> directory_listing;
if (!device_manager_.ReadDirectoryById(storage_name,
fileId,
&directory_listing)) {
error.set(kMtpdServiceError, "ReadDirectoryById failed");
return FileEntry::EmptyFileEntriesToDBusFormat();
}
return FileEntry::FileEntriesToDBusFormat(directory_listing);
}
std::vector<uint8_t> MtpdServer::ReadFileChunkByPath(
const std::string& handle,
const std::string& filePath,
const uint32_t& offset,
const uint32_t& count,
DBus::Error& error) {
if (count > kMaxReadCount || count == 0) {
error.set(kMtpdServiceError, "Invalid count for ReadFileChunkByPath");
return std::vector<uint8_t>();
}
std::string storage_name = LookupHandle(handle);
if (storage_name.empty())
return InvalidHandle<std::vector<uint8_t> >(handle, &error);
std::vector<uint8_t> file_contents;
if (!device_manager_.ReadFileChunkByPath(storage_name, filePath, offset,
count, &file_contents)) {
error.set(kMtpdServiceError, "ReadFileChunkByPath failed");
return std::vector<uint8_t>();
}
return file_contents;
}
std::vector<uint8_t> MtpdServer::ReadFileChunkById(const std::string& handle,
const uint32_t& fileId,
const uint32_t& offset,
const uint32_t& count,
DBus::Error& error) {
if (count > kMaxReadCount || count == 0) {
error.set(kMtpdServiceError, "Invalid count for ReadFileChunkById");
return std::vector<uint8_t>();
}
std::string storage_name = LookupHandle(handle);
if (storage_name.empty())
return InvalidHandle<std::vector<uint8_t> >(handle, &error);
std::vector<uint8_t> file_contents;
if (!device_manager_.ReadFileChunkById(storage_name, fileId, offset, count,
&file_contents)) {
error.set(kMtpdServiceError, "ReadFileChunkById failed");
return std::vector<uint8_t>();
}
return file_contents;
}
std::vector<uint8_t> MtpdServer::GetFileInfoByPath(const std::string& handle,
const std::string& filePath,
DBus::Error& error) {
std::string storage_name = LookupHandle(handle);
if (storage_name.empty()) {
SetInvalidHandleError(handle, &error);
return FileEntry().ToDBusFormat();
}
FileEntry entry;
if (!device_manager_.GetFileInfoByPath(storage_name, filePath, &entry)) {
error.set(kMtpdServiceError, "GetFileInfoByPath failed");
return FileEntry().ToDBusFormat();
}
return entry.ToDBusFormat();
}
std::vector<uint8_t> MtpdServer::GetFileInfoById(const std::string& handle,
const uint32_t& fileId,
DBus::Error& error) {
std::string storage_name = LookupHandle(handle);
if (storage_name.empty()) {
SetInvalidHandleError(handle, &error);
return FileEntry().ToDBusFormat();
}
FileEntry entry;
if (!device_manager_.GetFileInfoById(storage_name, fileId, &entry)) {
error.set(kMtpdServiceError, "GetFileInfoById failed");
return FileEntry().ToDBusFormat();
}
return entry.ToDBusFormat();
}
bool MtpdServer::IsAlive(DBus::Error& error) {
return true;
}
void MtpdServer::StorageAttached(const std::string& storage_name) {
// Fire DBus signal.
MTPStorageAttached(storage_name);
}
void MtpdServer::StorageDetached(const std::string& storage_name) {
// Fire DBus signal.
MTPStorageDetached(storage_name);
}
int MtpdServer::GetDeviceEventDescriptor() const {
return device_manager_.GetDeviceEventDescriptor();
}
void MtpdServer::ProcessDeviceEvents() {
device_manager_.ProcessDeviceEvents();
}
std::string MtpdServer::LookupHandle(const std::string& handle) {
HandleMap::const_iterator it = handle_map_.find(handle);
return (it == handle_map_.end()) ? std::string() : it->second;
}
} // namespace mtpd
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