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|
/*
* Copyright (C) 2003-2014 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 "UpnpDatabasePlugin.hxx"
#include "upnp/Domain.hxx"
#include "upnp/upnpplib.hxx"
#include "upnp/Discovery.hxx"
#include "upnp/ContentDirectoryService.hxx"
#include "upnp/Directory.hxx"
#include "upnp/Tags.hxx"
#include "upnp/Util.hxx"
#include "DatabasePlugin.hxx"
#include "DatabaseSelection.hxx"
#include "DatabaseError.hxx"
#include "PlaylistVector.hxx"
#include "Directory.hxx"
#include "Song.hxx"
#include "ConfigData.hxx"
#include "tag/TagBuilder.hxx"
#include "tag/TagTable.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "Log.hxx"
#include "SongFilter.hxx"
#include <string>
#include <vector>
#include <set>
#include <assert.h>
#include <string.h>
static const char *const rootid = "0";
class UpnpDatabase : public Database {
LibUPnP *m_lib;
UPnPDeviceDirectory *m_superdir;
Directory *m_root;
public:
static Database *Create(EventLoop &loop, DatabaseListener &listener,
const config_param ¶m,
Error &error);
virtual bool Open(Error &error) override;
virtual void Close() override;
virtual Song *GetSong(const char *uri_utf8,
Error &error) const override;
virtual void ReturnSong(Song *song) const;
virtual bool Visit(const DatabaseSelection &selection,
VisitDirectory visit_directory,
VisitSong visit_song,
VisitPlaylist visit_playlist,
Error &error) const override;
virtual bool VisitUniqueTags(const DatabaseSelection &selection,
TagType tag_type,
VisitString visit_string,
Error &error) const override;
virtual bool GetStats(const DatabaseSelection &selection,
DatabaseStats &stats,
Error &error) const override;
virtual time_t GetUpdateStamp() const {return 0;}
protected:
bool Configure(const config_param ¶m, Error &error);
private:
bool VisitServer(ContentDirectoryService &server,
const std::vector<std::string> &vpath,
const DatabaseSelection &selection,
VisitDirectory visit_directory,
VisitSong visit_song,
VisitPlaylist visit_playlist,
Error &error) const;
/**
* Run an UPnP search according to MPD parameters, and
* visit_song the results.
*/
bool SearchSongs(ContentDirectoryService &server,
const char *objid,
const DatabaseSelection &selection,
VisitSong visit_song,
Error &error) const;
bool SearchSongs(ContentDirectoryService &server,
const char *objid,
const DatabaseSelection &selection,
UPnPDirContent& dirbuf,
Error &error) const;
bool Namei(ContentDirectoryService &server,
const std::vector<std::string> &vpath,
std::string &oobjid, UPnPDirObject &dirent,
Error &error) const;
/**
* Take server and objid, return metadata.
*/
bool ReadNode(ContentDirectoryService &server,
const char *objid, UPnPDirObject& dirent,
Error &error) const;
/**
* Get the path for an object Id. This works much like pwd,
* except easier cause our inodes have a parent id. Not used
* any more actually (see comments in SearchSongs).
*/
bool BuildPath(ContentDirectoryService &server,
const UPnPDirObject& dirent, std::string &idpath,
Error &error) const;
};
Database *
UpnpDatabase::Create(gcc_unused EventLoop &loop,
gcc_unused DatabaseListener &listener,
const config_param ¶m, Error &error)
{
UpnpDatabase *db = new UpnpDatabase();
if (!db->Configure(param, error)) {
delete db;
return nullptr;
}
/* libupnp loses its ability to receive multicast messages
apparently due to daemonization; using the LazyDatabase
wrapper works around this problem */
return db;
}
bool
UpnpDatabase::Configure(const config_param &, Error &)
{
return true;
}
bool
UpnpDatabase::Open(Error &error)
{
m_lib = new LibUPnP();
if (!m_lib->ok()) {
error.Set(m_lib->GetInitError());
delete m_lib;
return false;
}
m_superdir = new UPnPDeviceDirectory(m_lib);
if (!m_superdir->Start(error)) {
delete m_superdir;
delete m_lib;
return false;
}
m_root = Directory::NewRoot();
// Wait for device answers. This should be consistent with the value set
// in the lib (currently 2)
sleep(2);
return true;
}
void
UpnpDatabase::Close()
{
delete m_root;
delete m_superdir;
delete m_lib;
}
void
UpnpDatabase::ReturnSong(Song *song) const
{
assert(song != nullptr);
song->Free();
}
// If uri is empty, we use the object's url instead. This happens
// when the target of a Visit() is a song, which only happens when
// "add"ing AFAIK. Visit() calls us with a null uri so that the url
// appropriate for fetching is used instead.
static Song *
upnpItemToSong(const UPnPDirObject &dirent, const char *uri)
{
if (*uri == 0)
uri = dirent.url.c_str();
Song *s = Song::NewFile(uri, nullptr);
s->tag = new Tag(dirent.tag);
return s;
}
// Get song info by path. We can receive either the id path, or the titles
// one
Song *
UpnpDatabase::GetSong(const char *uri, Error &error) const
{
Song *song = nullptr;
auto vpath = stringToTokens(uri, "/", true);
if (vpath.size() >= 2) {
ContentDirectoryService server;
if (!m_superdir->getServer(vpath[0].c_str(), server, error))
return nullptr;
vpath.erase(vpath.begin());
UPnPDirObject dirent;
if (vpath[0].compare(rootid)) {
std::string objid;
if (!Namei(server, vpath, objid, dirent, error))
return nullptr;
} else {
if (!ReadNode(server, vpath.back().c_str(), dirent,
error))
return nullptr;
}
song = upnpItemToSong(dirent, "");
}
if (song == nullptr)
error.Format(db_domain, DB_NOT_FOUND, "No such song: %s", uri);
return song;
}
/**
* Double-quote a string, adding internal backslash escaping.
*/
static void
dquote(std::string &out, const char *in)
{
out.append(1, '"');
for (; *in != 0; ++in) {
switch(*in) {
case '\\':
case '"':
out.append(1, '\\');
out.append(1, *in);
break;
default:
out.append(1, *in);
}
}
out.append(1, '"');
}
// Run an UPnP search, according to MPD parameters. Return results as
// UPnP items
bool
UpnpDatabase::SearchSongs(ContentDirectoryService &server,
const char *objid,
const DatabaseSelection &selection,
UPnPDirContent &dirbuf,
Error &error) const
{
const SongFilter *filter = selection.filter;
if (selection.filter == nullptr)
return true;
std::set<std::string> searchcaps;
if (!server.getSearchCapabilities(m_lib->getclh(), searchcaps, error))
return false;
if (searchcaps.empty())
return true;
std::string cond;
for (const auto &item : filter->GetItems()) {
switch (auto tag = item.GetTag()) {
case LOCATE_TAG_ANY_TYPE:
{
if (!cond.empty()) {
cond += " and ";
}
cond += "(";
bool first(true);
for (const auto& cap : searchcaps) {
if (first)
first = false;
else
cond += " or ";
cond += cap;
if (item.GetFoldCase()) {
cond += " contains ";
} else {
cond += " = ";
}
dquote(cond, item.GetValue().c_str());
}
cond += ")";
}
break;
default:
/* Unhandled conditions like
LOCATE_TAG_BASE_TYPE or
LOCATE_TAG_FILE_TYPE won't have a
corresponding upnp prop, so they will be
skipped */
if (tag == TAG_ALBUM_ARTIST)
tag = TAG_ARTIST;
// TODO: support LOCATE_TAG_ANY_TYPE etc.
const char *name = tag_table_lookup(upnp_tags,
TagType(tag));
if (name == nullptr)
continue;
if (!cond.empty()) {
cond += " and ";
}
cond += name;
/* FoldCase doubles up as contains/equal
switch. UpNP search is supposed to be
case-insensitive, but at least some servers
have the same convention as mpd (e.g.:
minidlna) */
if (item.GetFoldCase()) {
cond += " contains ";
} else {
cond += " = ";
}
dquote(cond, item.GetValue().c_str());
}
}
return server.search(m_lib->getclh(),
objid, cond.c_str(), dirbuf,
error);
}
static bool
visitSong(const UPnPDirObject& meta, const char *path,
const DatabaseSelection &selection,
VisitSong visit_song, Error& error)
{
if (!visit_song)
return true;
Song *s = upnpItemToSong(meta, path);
if (!selection.Match(*s))
return true;
bool success = visit_song(*s, error);
s->Free();
return success;
}
/**
* Build synthetic path based on object id for search results. The use
* of "rootid" is arbitrary, any name that is not likely to be a top
* directory name would fit.
*/
static const std::string
songPath(const std::string &servername,
const std::string &objid)
{
return servername + "/" + rootid + "/" + objid;
}
bool
UpnpDatabase::SearchSongs(ContentDirectoryService &server,
const char *objid,
const DatabaseSelection &selection,
VisitSong visit_song,
Error &error) const
{
UPnPDirContent dirbuf;
if (!visit_song)
return true;
if (!SearchSongs(server, objid, selection, dirbuf, error))
return false;
for (const auto &dirent : dirbuf.objects) {
if (dirent.type != UPnPDirObject::Type::ITEM ||
dirent.item_class != UPnPDirObject::ItemClass::MUSIC)
continue;
// We get song ids as the result of the UPnP search. But our
// client expects paths (e.g. we get 1$4$3788 from minidlna,
// but we need to translate to /Music/All_Music/Satisfaction).
// We can do this in two ways:
// - Rebuild a normal path using BuildPath() which is a kind of pwd
// - Build a bogus path based on the song id.
// The first method is nice because the returned paths are pretty, but
// it has two big problems:
// - The song paths are ambiguous: e.g. minidlna returns all search
// results as being from the "All Music" directory, which can
// contain several songs with the same title (but different objids)
// - The performance of BuildPath() is atrocious on very big
// directories, even causing timeouts in clients. And of
// course, 'All Music' is very big.
// So we return synthetic and ugly paths based on the object id,
// which we later have to detect.
std::string path = songPath(server.getFriendlyName(),
dirent.m_id);
//BuildPath(server, dirent, path);
if (!visitSong(dirent, path.c_str(), selection, visit_song,
error))
return false;
}
return true;
}
bool
UpnpDatabase::ReadNode(ContentDirectoryService &server,
const char *objid, UPnPDirObject &dirent,
Error &error) const
{
UPnPDirContent dirbuf;
if (!server.getMetadata(m_lib->getclh(), objid, dirbuf, error))
return false;
if (dirbuf.objects.size() == 1) {
dirent = std::move(dirbuf.objects[0]);
} else {
error.Format(upnp_domain, "Bad resource");
return false;
}
return true;
}
bool
UpnpDatabase::BuildPath(ContentDirectoryService &server,
const UPnPDirObject& idirent,
std::string &path,
Error &error) const
{
const char *pid = idirent.m_id.c_str();
path.clear();
UPnPDirObject dirent;
while (strcmp(pid, rootid) != 0) {
if (!ReadNode(server, pid, dirent, error))
return false;
pid = dirent.m_pid.c_str();
path = dirent.name + (path.empty()? "" : "/" + path);
}
path = std::string(server.getFriendlyName()) + "/" + path;
return true;
}
// Take server and internal title pathname and return objid and metadata.
bool
UpnpDatabase::Namei(ContentDirectoryService &server,
const std::vector<std::string> &vpath,
std::string &oobjid, UPnPDirObject &odirent,
Error &error) const
{
oobjid.clear();
std::string objid(rootid);
if (vpath.empty()) {
// looking for root info
if (!ReadNode(server, rootid, odirent, error))
return false;
oobjid = rootid;
return true;
}
const UpnpClient_Handle handle = m_lib->getclh();
// Walk the path elements, read each directory and try to find the next one
for (unsigned int i = 0; i < vpath.size(); i++) {
UPnPDirContent dirbuf;
if (!server.readDir(handle, objid.c_str(), dirbuf, error))
return false;
// Look for the name in the sub-container list
UPnPDirObject *child = dirbuf.FindObject(vpath[i].c_str());
if (child == nullptr)
break;
switch (child->type) {
case UPnPDirObject::Type::UNKNOWN:
assert(false);
gcc_unreachable();
case UPnPDirObject::Type::CONTAINER:
objid = child->m_id; // Next readdir target
if (i == vpath.size() - 1) {
// The last element in the path was found and it's
// a container, we're done
oobjid = objid;
odirent = std::move(*child);
return true;
}
break;
case UPnPDirObject::Type::ITEM:
// If this is the last path elt, we found the target,
// else it does not exist
if (i == vpath.size() - 1) {
oobjid = objid;
odirent = std::move(*child);
return true;
} else {
error.Format(db_domain, DB_NOT_FOUND,
"No such object");
return false;
}
}
}
error.Format(db_domain, DB_NOT_FOUND, "No such object");
return false;
}
// vpath is a parsed and writeable version of selection.uri. There is
// really just one path parameter.
bool
UpnpDatabase::VisitServer(ContentDirectoryService &server,
const std::vector<std::string> &vpath,
const DatabaseSelection &selection,
VisitDirectory visit_directory,
VisitSong visit_song,
VisitPlaylist visit_playlist,
Error &error) const
{
/* If the path begins with rootid, we know that this is a
song, not a directory (because that's how we set things
up). Just visit it. Note that the choice of rootid is
arbitrary, any value not likely to be the name of a top
directory would be ok. */
/* !Note: this *can't* be handled by Namei further down,
because the path is not valid for traversal. Besides, it's
just faster to access the target node directly */
if (!vpath.empty() && !vpath[0].compare(rootid)) {
if (visit_song) {
UPnPDirObject dirent;
if (!ReadNode(server, vpath.back().c_str(), dirent,
error))
return false;
if (!visitSong(dirent, "", selection,
visit_song, error))
return false;
}
return true;
}
// Translate the target path into an object id and the associated metadata.
std::string objid;
UPnPDirObject tdirent;
if (!Namei(server, vpath, objid, tdirent, error))
return false;
if (objid.empty())
// Not found, not a fatal error
return true;
/* If recursive is set, this is a search... No use sending it
if the filter is empty. In this case, we implement limited
recursion (1-deep) here, which will handle the "add dir"
case. */
if (selection.recursive && selection.filter)
return SearchSongs(server, objid.c_str(), selection,
visit_song, error);
if (tdirent.type == UPnPDirObject::Type::ITEM) {
// Target is a song. Not too sure we ever get there actually, maybe
// this is always catched by the special uri test above.
switch (tdirent.item_class) {
case UPnPDirObject::ItemClass::MUSIC:
if (visit_song)
return visitSong(tdirent, "", selection, visit_song,
error);
break;
case UPnPDirObject::ItemClass::PLAYLIST:
if (visit_playlist) {
/* Note: I've yet to see a playlist
item (playlists seem to be usually
handled as containers, so I'll decide
what to do when I see one... */
}
break;
case UPnPDirObject::ItemClass::UNKNOWN:
break;
}
return true;
}
/* Target was a a container. Visit it. We could read slices
and loop here, but it's not useful as mpd will only return
data to the client when we're done anyway. */
UPnPDirContent dirbuf;
if (!server.readDir(m_lib->getclh(), objid.c_str(), dirbuf, error))
return false;
for (const auto &dirent : dirbuf.objects) {
switch (dirent.type) {
case UPnPDirObject::Type::UNKNOWN:
assert(false);
gcc_unreachable();
case UPnPDirObject::Type::CONTAINER:
if (visit_directory) {
Directory d((selection.uri + "/" +
dirent.name).c_str(),
m_root);
if (!visit_directory(d, error))
return false;
}
break;
case UPnPDirObject::Type::ITEM:
switch (dirent.item_class) {
case UPnPDirObject::ItemClass::MUSIC:
if (visit_song) {
/* We identify songs by giving
them a special path. The Id
is enough to fetch them
from the server anyway. */
std::string p;
if (!selection.recursive)
p = selection.uri + "/" +
dirent.name;
if (!visitSong(dirent, p.c_str(),
selection, visit_song, error))
return false;
}
break;
case UPnPDirObject::ItemClass::PLAYLIST:
if (visit_playlist) {
/* Note: I've yet to see a
playlist item (playlists
seem to be usually handled
as containers, so I'll
decide what to do when I
see one... */
}
break;
case UPnPDirObject::ItemClass::UNKNOWN:
break;
}
}
}
return true;
}
// Deal with the possibly multiple servers, call VisitServer if needed.
bool
UpnpDatabase::Visit(const DatabaseSelection &selection,
VisitDirectory visit_directory,
VisitSong visit_song,
VisitPlaylist visit_playlist,
Error &error) const
{
auto vpath = stringToTokens(selection.uri, "/", true);
if (vpath.empty()) {
std::vector<ContentDirectoryService> servers;
if (!m_superdir->getDirServices(servers, error))
return false;
if (!selection.recursive) {
// If the path is empty and recursive is not set, synthetize a
// pseudo-directory from the list of servers.
if (visit_directory) {
for (auto& server : servers) {
Directory d(server.getFriendlyName(), m_root);
if (!visit_directory(d, error))
return false;
}
}
} else {
// Recursive is set: visit each server
for (auto& server : servers) {
if (!VisitServer(server, std::vector<std::string>(), selection,
visit_directory, visit_song, visit_playlist, error))
return false;
}
}
return true;
}
// We do have a path: the first element selects the server
std::string servername(vpath[0]);
vpath.erase(vpath.begin());
ContentDirectoryService server;
if (!m_superdir->getServer(servername.c_str(), server, error))
return false;
return VisitServer(server, vpath, selection,
visit_directory, visit_song, visit_playlist, error);
}
bool
UpnpDatabase::VisitUniqueTags(const DatabaseSelection &selection,
TagType tag,
VisitString visit_string,
Error &error) const
{
if (!visit_string)
return true;
std::vector<ContentDirectoryService> servers;
if (!m_superdir->getDirServices(servers, error))
return false;
std::set<std::string> values;
for (auto& server : servers) {
UPnPDirContent dirbuf;
if (!SearchSongs(server, rootid, selection, dirbuf, error))
return false;
for (const auto &dirent : dirbuf.objects) {
if (dirent.type != UPnPDirObject::Type::ITEM ||
dirent.item_class != UPnPDirObject::ItemClass::MUSIC)
continue;
const char *value = dirent.tag.GetValue(tag);
if (value != nullptr) {
#if defined(__clang__) || GCC_CHECK_VERSION(4,8)
values.emplace(value);
#else
values.insert(value);
#endif
}
}
}
for (const auto& value : values)
if (!visit_string(value.c_str(), error))
return false;
return true;
}
bool
UpnpDatabase::GetStats(const DatabaseSelection &,
DatabaseStats &stats, Error &) const
{
/* Note: this gets called before the daemonizing so we can't
reallyopen this would be a problem if we had real stats */
stats.song_count = 0;
stats.total_duration = 0;
stats.artist_count = 0;
stats.album_count = 0;
return true;
}
const DatabasePlugin upnp_db_plugin = {
"upnp",
UpnpDatabase::Create,
};
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