tdlight/td/telegram/files/FileLoaderUtils.cpp

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/telegram/files/FileLoaderUtils.h"
#include "td/telegram/files/FileLocation.h"
#include "td/telegram/Global.h"
#include "td/utils/common.h"
#include "td/utils/filesystem.h"
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/PathView.h"
#include "td/utils/port/FileFd.h"
#include "td/utils/port/path.h"
#include "td/utils/Random.h"
#include "td/utils/StringBuilder.h"
namespace td {
namespace {
Result<std::pair<FileFd, string>> try_create_new_file(Result<CSlice> result_name) {
TRY_RESULT(name, std::move(result_name));
TRY_RESULT(fd, FileFd::open(name, FileFd::Read | FileFd::Write | FileFd::CreateNew, 0640));
return std::make_pair(std::move(fd), name.str());
}
struct RandSuff {
int len;
};
StringBuilder &operator<<(StringBuilder &sb, const RandSuff &) {
for (int i = 0; i < 6; i++) {
sb << format::hex_digit(Random::fast(0, 15));
}
return sb;
}
struct Ext {
Slice ext;
};
StringBuilder &operator<<(StringBuilder &sb, const Ext &ext) {
if (ext.ext.empty()) {
return sb;
}
return sb << "." << ext.ext;
}
} // namespace
Result<std::pair<FileFd, string>> open_temp_file(const FileType &file_type) {
auto pmc = G()->td_db()->get_binlog_pmc();
// TODO: CAS?
int32 file_id = to_integer<int32>(pmc->get("tmp_file_id"));
pmc->set("tmp_file_id", to_string(file_id + 1));
auto temp_dir = get_files_temp_dir(file_type);
auto res = try_create_new_file(PSLICE_SAFE() << temp_dir << file_id);
if (res.is_error()) {
res = try_create_new_file(PSLICE_SAFE() << temp_dir << file_id << "_" << RandSuff{6});
}
return res;
}
Result<string> create_from_temp(CSlice temp_path, CSlice dir, CSlice name) {
decltype(try_create_new_file("path")) res;
auto cleaned_name = clean_filename(name);
PathView path_view(cleaned_name);
auto stem = path_view.file_stem();
auto ext = path_view.extension();
if (!stem.empty() && !G()->parameters().ignore_file_names) {
res = try_create_new_file(PSLICE_SAFE() << dir << stem << Ext{ext});
for (int i = 0; res.is_error() && i < 10; i++) {
res = try_create_new_file(PSLICE_SAFE() << dir << stem << "_(" << i << ")" << Ext{ext});
}
for (int i = 2; res.is_error() && i < 12; i++) {
res = try_create_new_file(PSLICE_SAFE() << dir << stem << "_(" << RandSuff{i} << ")" << Ext{ext});
}
} else {
auto pmc = G()->td_db()->get_binlog_pmc();
int32 file_id = to_integer<int32>(pmc->get("perm_file_id"));
pmc->set("perm_file_id", to_string(file_id + 1));
res = try_create_new_file(PSLICE_SAFE() << dir << "file_" << file_id << Ext{ext});
if (res.is_error()) {
res = try_create_new_file(PSLICE_SAFE() << dir << "file_" << file_id << "_" << RandSuff{6} << Ext{ext});
}
}
TRY_RESULT(tmp, std::move(res));
tmp.first.close();
auto perm_path = std::move(tmp.second);
TRY_STATUS(rename(temp_path, perm_path));
return perm_path;
}
const char *file_type_name[file_type_size] = {"thumbnails", "profile_photos", "photos", "voice",
"videos", "documents", "secret", "temp",
"stickers", "music", "animations", "secret_thumbnails",
"wallpapers", "video_notes"};
string get_file_base_dir(const FileDirType &file_dir_type) {
switch (file_dir_type) {
case FileDirType::Secure:
return G()->get_dir().str();
case FileDirType::Common:
return G()->get_files_dir().str();
default:
UNREACHABLE();
return "";
}
}
string get_files_base_dir(const FileType &file_type) {
return get_file_base_dir(get_file_dir_type(file_type));
}
string get_files_temp_dir(const FileType &file_type) {
return get_files_base_dir(file_type) + "temp" + TD_DIR_SLASH;
}
string get_files_dir(const FileType &file_type) {
return get_files_base_dir(file_type) + file_type_name[static_cast<int32>(file_type)] + TD_DIR_SLASH;
}
} // namespace td