transmission/libtransmission/platform.cc

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// This file Copyright © Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
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#include <algorithm>
#include <array>
#include <iterator>
#include <list>
#include <string>
#include <string_view>
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#include <utility>
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#include <vector>
#ifdef __HAIKU__
#include <limits.h> /* PATH_MAX */
#endif
#ifdef _WIN32
#include <process.h> /* _beginthreadex(), _endthreadex() */
#include <windows.h>
#include <shlobj.h> /* SHGetKnownFolderPath(), FOLDERID_... */
#ifdef small // workaround name collision between libsmall and rpcndr.h
#undef small
#endif
#else
#include <pwd.h>
#include <unistd.h> /* getuid() */
#endif
#ifdef BUILD_MAC_CLIENT
#include <CoreFoundation/CoreFoundation.h>
#endif
#ifdef __HAIKU__
#include <FindDirectory.h>
#endif
#include <fmt/core.h>
#include "libtransmission/transmission.h"
#include "libtransmission/file.h"
#include "libtransmission/log.h"
#include "libtransmission/platform.h"
#include "libtransmission/session.h"
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#include "libtransmission/tr-strbuf.h"
#include "libtransmission/utils.h"
using namespace std::literals;
namespace
{
#ifdef _WIN32
std::string win32_get_known_folder_ex(REFKNOWNFOLDERID folder_id, DWORD flags)
{
if (PWSTR path; SHGetKnownFolderPath(folder_id, flags | KF_FLAG_DONT_UNEXPAND, nullptr, &path) == S_OK)
{
auto ret = tr_win32_native_to_utf8(path);
CoTaskMemFree(path);
return ret;
}
return {};
}
auto win32_get_known_folder(REFKNOWNFOLDERID folder_id)
{
return win32_get_known_folder_ex(folder_id, KF_FLAG_DONT_VERIFY);
}
#endif
std::string getHomeDir()
{
if (auto dir = tr_env_get_string("HOME"sv); !std::empty(dir))
{
return dir;
}
#ifdef _WIN32
if (auto dir = win32_get_known_folder(FOLDERID_Profile); !std::empty(dir))
{
return dir;
}
#else
struct passwd pwent = {};
struct passwd* pw = nullptr;
auto buf = std::array<char, 4096>{};
getpwuid_r(getuid(), &pwent, std::data(buf), std::size(buf), &pw);
if (pw != nullptr)
{
return pw->pw_dir;
}
#endif
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return {};
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}
std::string xdgConfigHome()
{
if (auto dir = tr_env_get_string("XDG_CONFIG_HOME"sv); !std::empty(dir))
{
return dir;
}
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return fmt::format("{:s}/.config"sv, getHomeDir());
}
std::string getXdgEntryFromUserDirs(std::string_view key)
{
auto content = std::vector<char>{};
if (auto const filename = fmt::format("{:s}/{:s}"sv, xdgConfigHome(), "user-dirs.dirs"sv);
!tr_sys_path_exists(filename) || !tr_file_read(filename, content) || std::empty(content))
{
return {};
}
// search for key="val" and extract val
auto const search = fmt::format("{:s}=\"", key);
auto begin = std::search(std::begin(content), std::end(content), std::begin(search), std::end(search));
if (begin == std::end(content))
{
return {};
}
std::advance(begin, std::size(search));
auto const end = std::find(begin, std::end(content), '"');
if (end == std::end(content))
{
return {};
}
auto val = std::string{ begin, end };
// if val contains "$HOME", replace that with getHomeDir()
auto constexpr Home = "$HOME"sv;
if (auto const it = std::search(std::begin(val), std::end(val), std::begin(Home), std::end(Home)); it != std::end(val))
{
val.replace(it, it + std::size(Home), getHomeDir());
}
return val;
}
[[nodiscard]] bool isWebClientDir(std::string_view path)
{
auto const filename = tr_pathbuf{ path, '/', "index.html"sv };
bool const found = tr_sys_path_exists(filename);
tr_logAddTrace(fmt::format("Searching for web interface file '{:s}'", filename));
return found;
}
} // namespace
// ---
std::string tr_getDefaultConfigDir(std::string_view appname)
{
if (std::empty(appname))
{
appname = "Transmission"sv;
}
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if (auto dir = tr_env_get_string("TRANSMISSION_HOME"sv); !std::empty(dir))
{
return dir;
}
#ifdef __APPLE__
return fmt::format("{:s}/Library/Application Support/{:s}"sv, getHomeDir(), appname);
#elif defined(_WIN32)
auto const appdata = win32_get_known_folder(FOLDERID_LocalAppData);
return fmt::format("{:s}/{:s}"sv, appdata, appname);
#elif defined(__HAIKU__)
char buf[PATH_MAX];
find_directory(B_USER_SETTINGS_DIRECTORY, -1, true, buf, sizeof(buf));
return fmt::format("{:s}/{:s}"sv, buf, appname);
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#else
return fmt::format("{:s}/{:s}"sv, xdgConfigHome(), appname);
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#endif
}
size_t tr_getDefaultConfigDirToBuf(char const* appname, char* buf, size_t buflen)
{
return tr_strv_to_buf(tr_getDefaultConfigDir(appname != nullptr ? appname : ""), buf, buflen);
}
std::string tr_getDefaultDownloadDir()
{
if (auto dir = getXdgEntryFromUserDirs("XDG_DOWNLOAD_DIR"sv); !std::empty(dir))
{
return dir;
}
#ifdef _WIN32
if (auto dir = win32_get_known_folder(FOLDERID_Downloads); !std::empty(dir))
{
return dir;
}
#endif
#ifdef __HAIKU__
return fmt::format("{:s}/Desktop"sv, getHomeDir());
#endif
return fmt::format("{:s}/Downloads"sv, getHomeDir());
}
size_t tr_getDefaultDownloadDirToBuf(char* buf, size_t buflen)
{
return tr_strv_to_buf(tr_getDefaultDownloadDir(), buf, buflen);
}
// ---
std::string tr_getWebClientDir([[maybe_unused]] tr_session const* session)
{
if (auto dir = tr_env_get_string("CLUTCH_HOME"sv); !std::empty(dir))
{
return dir;
}
if (auto dir = tr_env_get_string("TRANSMISSION_WEB_HOME"sv); !std::empty(dir))
{
return dir;
}
#ifdef BUILD_MAC_CLIENT
// look in the Application Support folder
if (auto path = tr_pathbuf{ session->configDir(), "/public_html"sv }; isWebClientDir(path))
{
return std::string{ path };
}
// look in the resource bundle
auto app_url = CFBundleCopyBundleURL(CFBundleGetMainBundle());
auto app_ref = CFURLCopyFileSystemPath(app_url, kCFURLPOSIXPathStyle);
auto const buflen = CFStringGetMaximumSizeOfFileSystemRepresentation(app_ref);
auto buf = std::vector<char>(buflen, '\0');
bool const success = CFStringGetFileSystemRepresentation(app_ref, std::data(buf), std::size(buf));
TR_ASSERT(success);
CFRelease(app_url);
CFRelease(app_ref);
if (auto const path = tr_pathbuf{ std::string_view{ std::data(buf) }, "/Contents/Resources/public_html"sv };
isWebClientDir(path))
{
return std::string{ path };
}
#elif defined(_WIN32)
/* Generally, Web interface should be stored in a Web subdir of
* calling executable dir. */
static auto constexpr KnownFolderIds = std::array<KNOWNFOLDERID const* const, 3>{
&FOLDERID_LocalAppData,
&FOLDERID_RoamingAppData,
&FOLDERID_ProgramData,
};
for (auto const* const folder_id : KnownFolderIds)
{
auto const dir = win32_get_known_folder(*folder_id);
if (auto const path = tr_pathbuf{ dir, "/Transmission/public_html"sv }; isWebClientDir(path))
{
return std::string{ path };
}
}
/* check calling module place */
auto wide_module_path = std::array<wchar_t, MAX_PATH>{};
GetModuleFileNameW(nullptr, std::data(wide_module_path), std::size(wide_module_path));
auto const module_path = tr_win32_native_to_utf8({ std::data(wide_module_path) });
if (auto const dir = tr_sys_path_dirname(module_path); !std::empty(dir))
{
if (auto const path = tr_pathbuf{ dir, "/public_html"sv }; isWebClientDir(path))
{
return std::string{ path };
}
}
#else // everyone else, follow the XDG spec
auto candidates = std::list<std::string>{};
/* XDG_DATA_HOME should be the first in the list of candidates */
if (auto tmp = tr_env_get_string("XDG_DATA_HOME"sv); !std::empty(tmp))
{
candidates.emplace_back(std::move(tmp));
}
else
{
candidates.emplace_back(fmt::format("{:s}/.local/share"sv, getHomeDir()));
}
/* XDG_DATA_DIRS are the backup directories */
{
char const* const pkg = PACKAGE_DATA_DIR;
auto const xdg = tr_env_get_string("XDG_DATA_DIRS"sv);
auto const buf = fmt::format("{:s}:{:s}:/usr/local/share:/usr/share", pkg, xdg);
auto sv = std::string_view{ buf };
auto token = std::string_view{};
while (tr_strv_sep(&sv, &token, ':'))
{
token = tr_strv_strip(token);
if (!std::empty(token))
{
candidates.emplace_back(token);
}
}
}
/* walk through the candidates & look for a match */
for (auto const& dir : candidates)
{
if (auto const path = tr_pathbuf{ dir, "/transmission/public_html"sv }; isWebClientDir(path))
{
return std::string{ path };
}
}
#endif
return {};
}
std::string tr_getSessionIdDir()
{
#ifndef _WIN32
return std::string{ "/tmp"sv };
#else
auto const program_data_dir = win32_get_known_folder_ex(FOLDERID_ProgramData, KF_FLAG_CREATE);
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auto result = fmt::format("{:s}/Transmission"sv, program_data_dir);
tr_sys_dir_create(result, 0, 0);
return result;
#endif
}