mpd/src/command/OtherCommands.cxx

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/*
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* Copyright (C) 2003-2015 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 "config.h"
#include "OtherCommands.hxx"
#include "Request.hxx"
#include "FileCommands.hxx"
#include "StorageCommands.hxx"
#include "CommandError.hxx"
#include "db/Uri.hxx"
#include "storage/StorageInterface.hxx"
#include "DetachedSong.hxx"
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#include "SongPrint.hxx"
#include "TagPrint.hxx"
#include "TagStream.hxx"
#include "tag/TagHandler.hxx"
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#include "TimePrint.hxx"
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#include "decoder/DecoderPrint.hxx"
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#include "protocol/ArgParser.hxx"
#include "protocol/Result.hxx"
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#include "ls.hxx"
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#include "mixer/Volume.hxx"
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#include "util/UriUtil.hxx"
#include "util/Error.hxx"
#include "util/ConstBuffer.hxx"
#include "fs/AllocatedPath.hxx"
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#include "Stats.hxx"
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#include "Permission.hxx"
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#include "PlaylistFile.hxx"
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#include "db/PlaylistVector.hxx"
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#include "client/Client.hxx"
#include "Partition.hxx"
#include "Instance.hxx"
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#include "Idle.hxx"
#ifdef ENABLE_DATABASE
#include "DatabaseCommands.hxx"
#include "db/Interface.hxx"
#include "db/update/Service.hxx"
#endif
#include <assert.h>
#include <string.h>
static void
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print_spl_list(Client &client, const PlaylistVector &list)
{
for (const auto &i : list) {
client_printf(client, "playlist: %s\n", i.name.c_str());
if (i.mtime > 0)
time_print(client, "Last-Modified", i.mtime);
}
}
CommandResult
handle_urlhandlers(Client &client, gcc_unused Request args)
{
if (client.IsLocal())
client_puts(client, "handler: file://\n");
print_supported_uri_schemes(client);
return CommandResult::OK;
}
CommandResult
handle_decoders(Client &client, gcc_unused Request args)
{
decoder_list_print(client);
return CommandResult::OK;
}
CommandResult
handle_tagtypes(Client &client, gcc_unused Request args)
{
tag_print_types(client);
return CommandResult::OK;
}
CommandResult
handle_kill(gcc_unused Client &client, gcc_unused Request args)
{
return CommandResult::KILL;
}
CommandResult
handle_close(gcc_unused Client &client, gcc_unused Request args)
{
return CommandResult::FINISH;
}
static void
print_tag(TagType type, const char *value, void *ctx)
{
Client &client = *(Client *)ctx;
tag_print(client, type, value);
}
CommandResult
handle_listfiles(Client &client, Request args)
{
/* default is root directory */
const char *const uri = args.IsEmpty() ? "" : args.front();
if (memcmp(uri, "file:///", 8) == 0)
/* list local directory */
return handle_listfiles_local(client, uri + 7);
#ifdef ENABLE_DATABASE
if (uri_has_scheme(uri))
/* use storage plugin to list remote directory */
return handle_listfiles_storage(client, uri);
/* must be a path relative to the configured
music_directory */
if (client.partition.instance.storage != nullptr)
/* if we have a storage instance, obtain a list of
files from it */
return handle_listfiles_storage(client,
*client.partition.instance.storage,
uri);
/* fall back to entries from database if we have no storage */
return handle_listfiles_db(client, uri);
#else
command_error(client, ACK_ERROR_NO_EXIST, "No database");
return CommandResult::ERROR;
#endif
}
static constexpr tag_handler print_tag_handler = {
nullptr,
print_tag,
nullptr,
};
CommandResult
handle_lsinfo(Client &client, Request args)
{
/* default is root directory */
const char *const uri = args.IsEmpty() ? "" : args.front();
if (memcmp(uri, "file:///", 8) == 0) {
/* print information about an arbitrary local file */
const char *path_utf8 = uri + 7;
const auto path_fs = AllocatedPath::FromUTF8(path_utf8);
if (path_fs.IsNull()) {
command_error(client, ACK_ERROR_NO_EXIST,
"unsupported file name");
return CommandResult::ERROR;
}
Error error;
if (!client.AllowFile(path_fs, error))
return print_error(client, error);
DetachedSong song(path_utf8);
if (!song.Update()) {
command_error(client, ACK_ERROR_NO_EXIST,
"No such file");
return CommandResult::ERROR;
}
song_print_info(client, song);
return CommandResult::OK;
}
if (uri_has_scheme(uri)) {
if (!uri_supported_scheme(uri)) {
command_error(client, ACK_ERROR_NO_EXIST,
"unsupported URI scheme");
return CommandResult::ERROR;
}
if (!tag_stream_scan(uri, print_tag_handler, &client)) {
command_error(client, ACK_ERROR_NO_EXIST,
"No such file");
return CommandResult::ERROR;
}
return CommandResult::OK;
}
#ifdef ENABLE_DATABASE
CommandResult result = handle_lsinfo2(client, args);
if (result != CommandResult::OK)
return result;
#endif
if (isRootDirectory(uri)) {
Error error;
const auto &list = ListPlaylistFiles(error);
print_spl_list(client, list);
} else {
#ifndef ENABLE_DATABASE
command_error(client, ACK_ERROR_NO_EXIST, "No database");
return CommandResult::ERROR;
#endif
}
return CommandResult::OK;
}
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#ifdef ENABLE_DATABASE
static CommandResult
handle_update(Client &client, UpdateService &update,
const char *uri_utf8, bool discard)
{
unsigned ret = update.Enqueue(uri_utf8, discard);
if (ret > 0) {
client_printf(client, "updating_db: %i\n", ret);
return CommandResult::OK;
} else {
command_error(client, ACK_ERROR_UPDATE_ALREADY,
"already updating");
return CommandResult::ERROR;
}
}
static CommandResult
handle_update(Client &client, Database &db,
const char *uri_utf8, bool discard)
{
Error error;
unsigned id = db.Update(uri_utf8, discard, error);
if (id > 0) {
client_printf(client, "updating_db: %i\n", id);
return CommandResult::OK;
} else if (error.IsDefined()) {
return print_error(client, error);
} else {
/* Database::Update() has returned 0 without setting
the Error: the method is not implemented */
command_error(client, ACK_ERROR_NO_EXIST, "Not implemented");
return CommandResult::ERROR;
}
}
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#endif
static CommandResult
handle_update(Client &client, Request args, bool discard)
{
#ifdef ENABLE_DATABASE
const char *path = "";
assert(args.size <= 1);
if (!args.IsEmpty()) {
path = args.front();
if (*path == 0 || strcmp(path, "/") == 0)
/* backwards compatibility with MPD 0.15 */
path = "";
else if (!uri_safe_local(path)) {
command_error(client, ACK_ERROR_ARG,
"Malformed path");
return CommandResult::ERROR;
}
}
UpdateService *update = client.partition.instance.update;
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if (update != nullptr)
return handle_update(client, *update, path, discard);
Database *db = client.partition.instance.database;
if (db != nullptr)
return handle_update(client, *db, path, discard);
#else
(void)args;
(void)discard;
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#endif
command_error(client, ACK_ERROR_NO_EXIST, "No database");
return CommandResult::ERROR;
}
CommandResult
handle_update(Client &client, gcc_unused Request args)
{
return handle_update(client, args, false);
}
CommandResult
handle_rescan(Client &client, gcc_unused Request args)
{
return handle_update(client, args, true);
}
CommandResult
handle_setvol(Client &client, Request args)
{
unsigned level;
if (!ParseCommandArg(client, level, args.front()))
return CommandResult::ERROR;
if (level > 100) {
command_error(client, ACK_ERROR_ARG, "Invalid volume value");
return CommandResult::ERROR;
}
if (!volume_level_change(client.partition.outputs, level)) {
command_error(client, ACK_ERROR_SYSTEM,
"problems setting volume");
return CommandResult::ERROR;
}
return CommandResult::OK;
}
CommandResult
handle_volume(Client &client, Request args)
{
int relative;
if (!ParseCommandArg(client, relative, args.front()))
return CommandResult::ERROR;
if (relative < -100 || relative > 100) {
command_error(client, ACK_ERROR_ARG, "Invalid volume value");
return CommandResult::ERROR;
}
const int old_volume = volume_level_get(client.partition.outputs);
if (old_volume < 0) {
command_error(client, ACK_ERROR_SYSTEM, "No mixer");
return CommandResult::ERROR;
}
int new_volume = old_volume + relative;
if (new_volume < 0)
new_volume = 0;
else if (new_volume > 100)
new_volume = 100;
if (new_volume != old_volume &&
!volume_level_change(client.partition.outputs, new_volume)) {
command_error(client, ACK_ERROR_SYSTEM,
"problems setting volume");
return CommandResult::ERROR;
}
return CommandResult::OK;
}
CommandResult
handle_stats(Client &client, gcc_unused Request args)
{
stats_print(client);
return CommandResult::OK;
}
CommandResult
handle_ping(gcc_unused Client &client, gcc_unused Request args)
{
return CommandResult::OK;
}
CommandResult
handle_password(Client &client, Request args)
{
unsigned permission = 0;
if (getPermissionFromPassword(args.front(), &permission) < 0) {
command_error(client, ACK_ERROR_PASSWORD, "incorrect password");
return CommandResult::ERROR;
}
client.SetPermission(permission);
return CommandResult::OK;
}
CommandResult
handle_config(Client &client, gcc_unused Request args)
{
if (!client.IsLocal()) {
command_error(client, ACK_ERROR_PERMISSION,
"Command only permitted to local clients");
return CommandResult::ERROR;
}
#ifdef ENABLE_DATABASE
const Storage *storage = client.GetStorage();
if (storage != nullptr) {
const auto path = storage->MapUTF8("");
client_printf(client, "music_directory: %s\n", path.c_str());
}
#endif
return CommandResult::OK;
}
CommandResult
handle_idle(Client &client, Request args)
{
unsigned flags = 0;
for (const char *i : args) {
unsigned event = idle_parse_name(i);
if (event == 0) {
command_error(client, ACK_ERROR_ARG,
"Unrecognized idle event: %s",
i);
return CommandResult::ERROR;
}
flags |= event;
}
/* No argument means that the client wants to receive everything */
if (flags == 0)
flags = ~0;
/* enable "idle" mode on this client */
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client.IdleWait(flags);
return CommandResult::IDLE;
}