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/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "UDisks2.hxx"
#include "Message.hxx"
#include "ReadIter.hxx"
#include "ObjectManager.hxx"
#include "util/StringAPI.hxx"
#include "util/StringView.hxx"
#include "util/Compiler.h"
#include <functional>
#include <stdexcept>
namespace UDisks2 {
template<typename I>
gcc_pure
static const char *
CheckString(I &&i) noexcept
{
if (i.GetArgType() != DBUS_TYPE_STRING)
return nullptr;
return i.GetString();
}
template<typename I>
gcc_pure
static StringView
CheckRecursedByteArrayToString(I &&i) noexcept
{
if (i.GetArgType() != DBUS_TYPE_BYTE)
return nullptr;
auto value = i.template GetFixedArray<char>();
return { value.data, value.size };
}
template<typename I>
gcc_pure
static StringView
CheckByteArrayToString(I &&i) noexcept
{
if (i.GetArgType() != DBUS_TYPE_ARRAY)
return nullptr;
return CheckRecursedByteArrayToString(i.Recurse());
}
template<typename I>
gcc_pure
static StringView
CheckByteArrayArrayFrontToString(I &&i) noexcept
{
if (i.GetArgType() != DBUS_TYPE_ARRAY)
return nullptr;
return CheckByteArrayToString(i.Recurse());
}
static void
ParseDriveDictEntry(Object &o, const char *name,
ODBus::ReadMessageIter &&value_i) noexcept
{
if (StringIsEqual(name, "Id")) {
const char *value = CheckString(value_i);
if (value != nullptr && o.drive_id.empty())
o.drive_id = value;
}
}
static void
ParseBlockDictEntry(Object &o, const char *name,
ODBus::ReadMessageIter &&value_i) noexcept
{
if (StringIsEqual(name, "Id")) {
const char *value = CheckString(value_i);
if (value != nullptr && o.block_id.empty())
o.block_id = value;
}
}
static void
ParseFileesystemDictEntry(Object &o, const char *name,
ODBus::ReadMessageIter &&value_i) noexcept
{
if (StringIsEqual(name, "MountPoints")) {
if (!o.mount_point.empty())
/* we already know one mount point, and we're
not interested in more */
return;
/* get the first string in the array */
auto value = CheckByteArrayArrayFrontToString(value_i);
if (value != nullptr)
o.mount_point = {value.data, value.size};
// TODO: check whether the string is a valid filesystem path
}
}
static void
ParseInterface(Object &o, const char *interface,
ODBus::ReadMessageIter &&i) noexcept
{
if (StringIsEqual(interface, "org.freedesktop.UDisks2.Drive")) {
i.ForEachProperty([&](auto n, auto v) {
return ParseDriveDictEntry(o, n, std::move(v));
});
} else if (StringIsEqual(interface, "org.freedesktop.UDisks2.Block")) {
i.ForEachProperty([&](auto n, auto v) {
return ParseBlockDictEntry(o, n, std::move(v));
});
} else if (StringIsEqual(interface, "org.freedesktop.UDisks2.Filesystem")) {
o.is_filesystem = true;
i.ForEachProperty([&](auto n, auto v) {
return ParseFileesystemDictEntry(o, n, std::move(v));
});
}
}
static void
ParseInterfaceDictEntry(Object &o, ODBus::ReadMessageIter &&i) noexcept
{
if (i.GetArgType() != DBUS_TYPE_STRING)
return;
const char *interface = i.GetString();
i.Next();
if (i.GetArgType() != DBUS_TYPE_ARRAY)
return;
ParseInterface(o, interface, i.Recurse());
}
void
ParseObject(Object &o, ODBus::ReadMessageIter &&i) noexcept
{
i.ForEach(DBUS_TYPE_DICT_ENTRY, [&o](auto &&j){
ParseInterfaceDictEntry(o, j.Recurse());
});
}
void
ParseObjects(ODBus::ReadMessageIter &&i,
std::function<void(Object &&o)> callback)
{
using namespace ODBus;
ForEachInterface(std::move(i), [&callback](const char *path, auto &&j){
Object o(path);
ParseObject(o, std::forward<decltype(j)>(j));
if (o.IsValid())
callback(std::move(o));
});
}
void
ParseObjects(ODBus::Message &reply,
std::function<void(Object &&o)> callback)
{
using namespace ODBus;
reply.CheckThrowError();
ReadMessageIter i(*reply.Get());
if (i.GetArgType() != DBUS_TYPE_ARRAY)
throw std::runtime_error("Malformed response");
ParseObjects(i.Recurse(), std::move(callback));
}
} // namespace UDisks2