/* Copyright (C) 2016 J.F.Dockes
* 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.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "plgwithslave.hxx"
#include <string>
#include <vector>
#include <sstream>
#include <string.h>
#include <fcntl.h>
#include <upnp/upnp.h>
#include <microhttpd.h>
#include <json/json.h>
#include <libupnpp/log.hxx>
#include "cmdtalk.h"
#include "pathut.h"
#include "smallut.h"
#include "main.hxx"
using namespace std;
using namespace std::placeholders;
//using json = nlohmann::json;
using namespace UPnPProvider;
class StreamHandle {
public:
StreamHandle(PlgWithSlave::Internal *plg) {
}
~StreamHandle() {
clear();
}
void clear() {
plg = 0;
path.clear();
media_url.clear();
len = 0;
opentime = 0;
}
PlgWithSlave::Internal *plg;
string path;
string media_url;
long long len;
time_t opentime;
};
// Timeout seconds for reading data from plugins. Be generous because
// streaming services are sometimes slow, but we don't want to be
// stuck forever.
static const int read_timeout(60);
class PlgWithSlave::Internal {
public:
Internal(PlgWithSlave *_plg, const string& exe, const string& hst,
int prt, const string& pp)
: plg(_plg), cmd(read_timeout), exepath(exe), upnphost(hst),
upnpport(prt), pathprefix(pp), laststream(this) { }
bool maybeStartCmd();
PlgWithSlave *plg;
CmdTalk cmd;
string exepath;
// Upnp Host and port. This would only be used to generate URLs *if*
// we were using the libupnp miniserver. We currently use
// microhttp because it can do redirects
string upnphost;
int upnpport;
// path prefix (this is used by upmpdcli that gets it for us).
string pathprefix;
// Cached uri translation
StreamHandle laststream;
};
// microhttpd daemon handle. There is only one of these, and one port, we find
// the right plugin by looking at the url path.
static struct MHD_Daemon *mhd;
// Microhttpd connection handler. We re-build the complete url + query
// string (&trackid=value), use this to retrieve a service URL
// (tidal/qobuz...), and redirect to it (HTTP). A previous version
// handled rtmp streams, and had to read them. Look up the history if
// you need the code again (the apparition of RTMP streams was
// apparently linked to the use of a different API key).
static int answer_to_connection(void *cls, struct MHD_Connection *connection,
const char *url,
const char *method, const char *version,
const char *upload_data,
size_t *upload_data_size, void **con_cls)
{
static int aptr;
if (&aptr != *con_cls) {
/* do not respond on first call */
*con_cls = &aptr;
return MHD_YES;
}
LOGDEB("answer_to_connection: url " << url << " method " << method <<
" version " << version << endl);
// The 'plgi' here is just whatever plugin started up the httpd task
// We just use it to find the appropriate plugin for this path,
// and then dispatch the request.
PlgWithSlave::Internal *plgi = (PlgWithSlave::Internal*)cls;
PlgWithSlave *realplg =
dynamic_cast<PlgWithSlave*>(plgi->plg->m_services->getpluginforpath(url));
if (nullptr == realplg) {
LOGERR("answer_to_connection: no plugin for path [" << url << endl);
return MHD_NO;
}
// We may need one day to subclass PlgWithSlave to implement a
// plugin-specific method. For now, existing plugins have
// compatible python code, and we can keep one c++ method.
// get_media_url() would also need changing because it is in
// Internal: either make it generic or move to subclass.
//return realplg->answer_to_connection(connection, url, method, version,
// upload_data, upload_data_size, con_cls);
string path(url);
// The streaming services plugins set a trackId parameter in the
// URIs. This gets parsed out by mhttpd. We rebuild a full url
// which we pass to them for translation (they will extract the
// trackid and use it, the rest of the path is bogus).
// The uprcl module has a real path and no trackid. Handle both cases
const char* stid =
MHD_lookup_connection_value(connection, MHD_GET_ARGUMENT_KIND,
"trackId");
if (stid && *stid) {
path += string("?version=1&trackId=") + stid;
}
// Translate to Tidal/Qobuz etc real temporary URL
string media_url = realplg->get_media_url(path);
if (media_url.empty()) {
LOGERR("answer_to_connection: no media_uri for: " << url << endl);
return MHD_NO;
}
if (media_url.find("http") == 0) {
static char data[] = "<html><body></body></html>";
struct MHD_Response *response =
MHD_create_response_from_buffer(strlen(data), data,
MHD_RESPMEM_PERSISTENT);
if (response == NULL) {
LOGERR("answer_to_connection: could not create response" << endl);
return MHD_NO;
}
MHD_add_response_header (response, "Location", media_url.c_str());
int ret = MHD_queue_response(connection, 302, response);
MHD_destroy_response(response);
return ret;
} else {
LOGERR("PlgWithSlave: got non-http URL !: " << media_url << endl);
LOGERR("PlgWithSlave: the code for handling these is gone !\n");
LOGERR(" will have to fetch it from git history\n");
return MHD_NO;
}
}
static int accept_policy(void *, const struct sockaddr* sa, socklen_t addrlen)
{
return MHD_YES;
}
// Called once for starting the Python program and do other initialization.
bool PlgWithSlave::Internal::maybeStartCmd()
{
if (cmd.running()) {
return true;
}
int port = CDPluginServices::default_microhttpport();
string sport;
if (plg->m_services->config_get("plgmicrohttpport", sport)) {
port = atoi(sport.c_str());
}
if (nullptr == mhd) {
// Start the microhttpd daemon. There can be only one, and it
// is started with a context handle which points to whatever
// plugin got there first. The callback will only use the
// handle to get to the plugin services, and retrieve the
// appropriate plugin based on the url path prefix.
LOGDEB("PlgWithSlave: starting httpd on port "<< port << endl);
mhd = MHD_start_daemon(
MHD_USE_THREAD_PER_CONNECTION,
//MHD_USE_SELECT_INTERNALLY,
port,
/* Accept policy callback and arg */
accept_policy, NULL,
/* handler and arg */
&answer_to_connection, this,
MHD_OPTION_END);
if (nullptr == mhd) {
LOGERR("PlgWithSlave: MHD_start_daemon failed\n");
return false;
}
}
string pythonpath = string("PYTHONPATH=") +
path_cat(g_datadir, "cdplugins") + ":" +
path_cat(g_datadir, "cdplugins/pycommon") + ":" +
path_cat(g_datadir, "cdplugins/" + plg->m_name);
string configname = string("UPMPD_CONFIG=") + g_configfilename;
stringstream ss;
ss << upnphost << ":" << port;
string hostport = string("UPMPD_HTTPHOSTPORT=") + ss.str();
string pp = string("UPMPD_PATHPREFIX=") + pathprefix;
if (!cmd.startCmd(exepath, {/*args*/},
/* env */ {pythonpath, configname, hostport, pp})) {
LOGERR("PlgWithSlave::maybeStartCmd: startCmd failed\n");
return false;
}
return true;
}
bool PlgWithSlave::startInit()
{
return m && m->maybeStartCmd();
}
// Translate the slave-generated HTTP URL (based on the trackid), to
// an actual temporary service (e.g. tidal one), which will be an HTTP
// URL pointing to either an AAC or a FLAC stream.
// Older versions of this module handled AAC FLV transported over
// RTMP, apparently because of the use of a different API key. Look up
// the git history if you need this again.
// The Python code calls the service to translate the trackid to a temp
// URL. We cache the result for a few seconds to avoid multiple calls
// to tidal.
string PlgWithSlave::get_media_url(const string& path)
{
LOGDEB0("PlgWithSlave::get_media_url: " << path << endl);
if (!m->maybeStartCmd()) {
return string();
}
time_t now = time(0);
if (m->laststream.path.compare(path) ||
(now - m->laststream.opentime > 10)) {
unordered_map<string, string> res;
if (!m->cmd.callproc("trackuri", {{"path", path}}, res)) {
LOGERR("PlgWithSlave::get_media_url: slave failure\n");
return string();
}
auto it = res.find("media_url");
if (it == res.end()) {
LOGERR("PlgWithSlave::get_media_url: no media url in result\n");
return string();
}
m->laststream.clear();
m->laststream.path = path;
m->laststream.media_url = it->second;
m->laststream.opentime = now;
}
LOGDEB("PlgWithSlave: media url [" << m->laststream.media_url << "]\n");
return m->laststream.media_url;
}
PlgWithSlave::PlgWithSlave(const string& name, CDPluginServices *services)
: CDPlugin(name, services)
{
string exepath = path_cat(g_datadir, "cdplugins");
exepath = path_cat(exepath, name);
exepath = path_cat(exepath, name + "-app" + ".py");
m = new Internal(this, exepath,
services->getupnpaddr(this),
services->getupnpport(this),
services->getpathprefix(this));
}
PlgWithSlave::~PlgWithSlave()
{
delete m;
}
static void catstring(string& dest, const string& s2)
{
if (s2.empty()) {
return;
}
if (dest.empty()) {
dest = s2;
} else {
dest += string(" ") + s2;
}
}
static int resultToEntries(const string& encoded, int stidx, int cnt,
vector<UpSong>& entries)
{
Json::Value decoded;
istringstream input(encoded);
input >> decoded;
LOGDEB0("PlgWithSlave::results: got " << decoded.size() << " entries \n");
LOGDEB1("PlgWithSlave::results: undecoded: " << decoded.dump() << endl);
bool dolimit = cnt > 0;
for (unsigned int i = stidx; i < decoded.size(); i++) {
#define JSONTOUPS(fld, nm) {catstring(song.fld, \
decoded[i].get(#nm, "").asString());}
if (dolimit && --cnt < 0) {
break;
}
UpSong song;
JSONTOUPS(id, id);
JSONTOUPS(parentid, pid);
JSONTOUPS(title, tt);
JSONTOUPS(artUri, upnp:albumArtURI);
JSONTOUPS(artist, upnp:artist);
JSONTOUPS(upnpClass, upnp:class);
JSONTOUPS(date, dc:date)
JSONTOUPS(date, releasedate)
// tp is container ("ct") or item ("it")
string stp = decoded[i].get("tp", "").asString();
if (!stp.compare("ct")) {
song.iscontainer = true;
string ss = decoded[i].get("searchable", "").asString();
if (!ss.empty()) {
song.searchable = stringToBool(ss);
}
} else if (!stp.compare("it")) {
song.iscontainer = false;
JSONTOUPS(uri, uri);
JSONTOUPS(artist, dc:creator);
JSONTOUPS(genre, upnp:genre);
JSONTOUPS(album, upnp:album);
JSONTOUPS(tracknum, upnp:originalTrackNumber);
JSONTOUPS(mime, res:mime);
string ss = decoded[i].get("duration", "").asString();
if (!ss.empty()) {
song.duration_secs = atoi(ss.c_str());
}
ss = decoded[i].get("res:size", "").asString();
if (!ss.empty()) {
song.size = atoll(ss.c_str());
}
ss = decoded[i].get("res:bitrate", "").asString();
if (!ss.empty()) {
song.bitrate = atoi(ss.c_str());
}
ss = decoded[i].get("res:samplefreq", "").asString();
if (!ss.empty()) {
song.samplefreq = atoi(ss.c_str());
}
ss = decoded[i].get("res:channels", "").asString();
if (!ss.empty()) {
song.channels = atoi(ss.c_str());
}
} else {
LOGERR("PlgWithSlave::result: bad type in entry: " << stp <<
"(title: " << song.title << ")\n");
continue;
}
LOGDEB1("PlgWitSlave::result: pushing: " << song.dump() << endl);
entries.push_back(song);
}
// We return the total match size, the count of actually returned
// entries can be obtained from the vector
return decoded.size();
}
class ContentCacheEntry {
public:
ContentCacheEntry()
: m_time(time(0)) {
}
int toResult(const string& classfilter, int stidx, int cnt,
vector<UpSong>& entries) const;
time_t m_time;
vector<UpSong> m_results;
};
int ContentCacheEntry::toResult(const string& classfilter, int stidx, int cnt,
vector<UpSong>& entries) const
{
const vector<UpSong>& res = m_results;
LOGDEB0("searchCacheEntryToResult: filter " << classfilter << " start " <<
stidx << " cnt " << cnt << " res.size " << res.size() << endl);
entries.reserve(cnt);
int total = 0;
for (unsigned int i = 0; i < res.size(); i++) {
if (!classfilter.empty() && res[i].upnpClass.find(classfilter) != 0) {
continue;
}
total++;
if (stidx > int(i)) {
continue;
}
if (cnt && int(entries.size()) >= cnt) {
break;
}
LOGDEB1("ContentCacheEntry::toResult: pushing class " <<
res[i].upnpClass << " tt " << res[i].title << endl);
entries.push_back(res[i]);
}
return res.size();
}
class ContentCache {
public:
ContentCache(int retention_secs = 300);
ContentCacheEntry *get(const string& query);
void set(const string& query, ContentCacheEntry &entry);
void purge();
private:
time_t m_lastpurge;
int m_retention_secs;
unordered_map<string, ContentCacheEntry> m_cache;
};
ContentCache::ContentCache(int retention_secs)
: m_lastpurge(time(0)), m_retention_secs(retention_secs)
{
}
void ContentCache::purge()
{
time_t now(time(0));
if (now - m_lastpurge < 5) {
return;
}
for (auto it = m_cache.begin(); it != m_cache.end(); ) {
if (now - it->second.m_time > m_retention_secs) {
LOGDEB0("ContentCache::purge: erasing " << it->first << endl);
it = m_cache.erase(it);
} else {
it++;
}
}
m_lastpurge = now;
}
ContentCacheEntry *ContentCache::get(const string& key)
{
purge();
auto it = m_cache.find(key);
if (it != m_cache.end()) {
LOGDEB0("ContentCache::get: found " << key << endl);
// we return a copy of the vector. Make our multi-access life simpler...
return new ContentCacheEntry(it->second);
}
LOGDEB0("ContentCache::get: not found " << key << endl);
return nullptr;
}
void ContentCache::set(const string& key, ContentCacheEntry &entry)
{
LOGDEB0("ContentCache::set: " << key << endl);
m_cache[key] = entry;
}
// Cache for searches
static ContentCache o_scache(300);
// Cache for browsing
static ContentCache o_bcache(180);
// Better return a bogus informative entry than an outright error:
static int errorEntries(const string& pid, vector<UpSong>& entries)
{
entries.push_back(
UpSong::item(pid + "$bogus", pid,
"Service login or communication failure"));
return 1;
}
// Note that the offset and count don't get to the plugin for
// now. Plugins just return a (plugin-dependant) fixed number of
// entries from offset 0, which we cache. There is no good reason for
// this, beyond the fact that we have to cap the entry count anyway,
// else the CP is going to read to the end which might be
// reaaaaalllllyyyy long.
int PlgWithSlave::browse(const string& objid, int stidx, int cnt,
vector<UpSong>& entries,
const vector<string>& sortcrits,
BrowseFlag flg)
{
LOGDEB1("PlgWithSlave::browse\n");
entries.clear();
if (!m->maybeStartCmd()) {
return errorEntries(objid, entries);
}
string sbflg;
switch (flg) {
case CDPlugin::BFMeta:
sbflg = "meta";
break;
case CDPlugin::BFChildren:
default:
sbflg = "children";
break;
}
string cachekey(m_name + ":" + objid);
if (flg == CDPlugin::BFChildren) {
// Check cache
ContentCacheEntry *cep;
if ((cep = o_bcache.get(cachekey)) != nullptr) {
int total = cep->toResult("", stidx, cnt, entries);
delete cep;
return total;
}
}
unordered_map<string, string> res;
if (!m->cmd.callproc("browse", {{"objid", objid}, {"flag", sbflg}}, res)) {
LOGERR("PlgWithSlave::browse: slave failure\n");
return errorEntries(objid, entries);
}
auto ite = res.find("entries");
if (ite == res.end()) {
LOGERR("PlgWithSlave::browse: no entries returned\n");
return errorEntries(objid, entries);
}
bool nocache = false;
auto itc = res.find("nocache");
if (itc != res.end()) {
nocache = stringToBool(itc->second);
}
if (flg == CDPlugin::BFChildren) {
ContentCacheEntry e;
resultToEntries(ite->second, 0, 0, e.m_results);
if (!nocache) {
o_bcache.set(cachekey, e);
}
return e.toResult("", stidx, cnt, entries);
} else {
return resultToEntries(ite->second, stidx, cnt, entries);
}
}
// Note that the offset and count don't get to the plugin for
// now. Plugins just return a (plugin-dependant) fixed number of
// entries from offset 0, which we cache. There is no good reason for
// this, beyond the fact that we have to cap the entry count anyway,
// else the CP is going to read to the end which might be
// reaaaaalllllyyyy long.
int PlgWithSlave::search(const string& ctid, int stidx, int cnt,
const string& searchstr,
vector<UpSong>& entries,
const vector<string>& sortcrits)
{
LOGDEB("PlgWithSlave::search: [" << searchstr << "]\n");
entries.clear();
if (!m->maybeStartCmd()) {
return errorEntries(ctid, entries);
}
// Computing a pre-cooked query. For simple-minded plugins.
// Note that none of the qobuz/gmusic/tidal plugins actually use
// the slavefield part (defining in what field the term should
// match).
//
// Ok, so the upnp query language is quite powerful, but us, not
// so much. We get rid of parenthesis and then try to find the
// first searchExp on a field we can handle, pretend the operator
// is "contains" and just do it. I so don't want to implement a
// parser for the query language when the services don't support
// anything complicated anyway, and the users don't even want it...
string ss;
neutchars(searchstr, ss, "()");
// The search had better be space-separated. no
// upnp:artist="beatles" for you
vector<string> vs;
stringToStrings(ss, vs);
// The sequence can now be either [field, op, value], or
// [field, op, value, and/or, field, op, value,...]
if ((vs.size() + 1) % 4 != 0) {
LOGERR("PlgWithSlave::search: bad search string: [" << searchstr <<
"]\n");
return errorEntries(ctid, entries);
}
string slavefield;
string value;
string classfilter;
string objkind;
for (unsigned int i = 0; i < vs.size()-2; i += 4) {
const string& upnpproperty = vs[i];
LOGDEB("PlgWithSlave::search:clause: " << vs[i] << " " << vs[i+1] <<
" " << vs[i+2] << endl);
if (!upnpproperty.compare("upnp:class")) {
// This defines -what- we are looking for (track/album/artist)
const string& what(vs[i+2]);
if (beginswith(what, "object.item")) {
objkind = "track";
} else if (beginswith(what, "object.container.person")) {
objkind = "artist";
} else if (beginswith(what, "object.container.musicAlbum") ||
beginswith(what, "object.container.album")) {
objkind = "album";
} else if (beginswith(what, "object.container.playlistContainer")
|| beginswith(what, "object.container.playlist")) {
objkind = "playlist";
}
classfilter = what;
} else if (!upnpproperty.compare("upnp:artist") ||
!upnpproperty.compare("dc:author")) {
slavefield = "artist";
value = vs[i+2];
break;
} else if (!upnpproperty.compare("upnp:album")) {
slavefield = "album";
value = vs[i+2];
break;
} else if (!upnpproperty.compare("dc:title")) {
slavefield = "track";
value = vs[i+2];
break;
}
}
// In cache ?
ContentCacheEntry *cep;
string cachekey(m_name + ":" + ctid + ":" + searchstr);
if ((cep = o_scache.get(cachekey)) != nullptr) {
int total = cep->toResult(classfilter, stidx, cnt, entries);
delete cep;
return total;
}
// Run query
unordered_map<string, string> res;
if (!m->cmd.callproc("search", {
{"objid", ctid},
{"objkind", objkind},
{"origsearch", searchstr},
{"field", slavefield},
{"value", value} }, res)) {
LOGERR("PlgWithSlave::search: slave failure\n");
return errorEntries(ctid, entries);
}
auto ite = res.find("entries");
if (ite == res.end()) {
LOGERR("PlgWithSlave::search: no entries returned\n");
return errorEntries(ctid, entries);
}
bool nocache = false;
auto itc = res.find("nocache");
if (itc != res.end()) {
nocache = stringToBool(itc->second);
}
// Convert the whole set and store in cache
ContentCacheEntry e;
resultToEntries(ite->second, 0, 0, e.m_results);
if (!nocache) {
o_scache.set(cachekey, e);
}
return e.toResult(classfilter, stidx, cnt, entries);
}