File indexing completed on 2024-05-12 16:45:57

 /***************************************************************************
     Copyright (C) 2009-2020 Robby Stephenson <robby@periapsis.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) version 3 or any later version        *
  *   accepted by the membership of KDE e.V. (or its successor approved     *
  *   by the membership of KDE e.V.), which shall act as a proxy            *
  *   defined in Section 14 of version 3 of the license.                    *
  *                                                                         *
  *   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, see <http://www.gnu.org/licenses/>. *
  *                                                                         *
  ***************************************************************************/
 
 #include <config.h> // for TELLICO_VERSION
 
 #include "musicbrainzfetcher.h"
 #include "../translators/xslthandler.h"
 #include "../translators/tellicoimporter.h"
 #include "../images/imagefactory.h"
 #include "../utils/guiproxy.h"
 #include "../utils/string_utils.h"
 #include "../collection.h"
 #include "../entry.h"
 #include "../utils/datafileregistry.h"
 #include "../utils/xmlhandler.h"
 #include "../tellico_debug.h"
 
 #include <KLocalizedString>
 #include <KIO/Job>
 #include <KJobUiDelegate>
 #include <KJobWidgets/KJobWidgets>
 #include <KConfigGroup>
 
 #include <QLabel>
 #include <QFile>
 #include <QTextStream>
 #include <QGridLayout>
 #include <QDomDocument>
 #include <QTextCodec>
 #include <QUrlQuery>
 #include <QThread>
 
 namespace {
   static const int MUSICBRAINZ_MAX_RETURNS_TOTAL = 10;
   static const char* MUSICBRAINZ_API_URL = "https://musicbrainz.org/ws/2/";
 }
 
 using namespace Tellico;
 using Tellico::Fetch::MusicBrainzFetcher;
 
 MusicBrainzFetcher::MusicBrainzFetcher(QObject* parent_)
     : Fetcher(parent_), m_xsltHandler(nullptr),
       m_limit(MUSICBRAINZ_MAX_RETURNS_TOTAL), m_total(-1), m_offset(0),
       m_job(nullptr), m_started(false) {
 }
 
 MusicBrainzFetcher::~MusicBrainzFetcher() {
   delete m_xsltHandler;
   m_xsltHandler = nullptr;
 }
 
 QString MusicBrainzFetcher::source() const {
   return m_name.isEmpty() ? defaultName() : m_name;
 }
 
 bool MusicBrainzFetcher::canSearch(Fetch::FetchKey k) const {
   return k == Title || k == Person || k == Keyword || k == UPC;
 }
 
 bool MusicBrainzFetcher::canFetch(int type) const {
   return type == Data::Collection::Album;
 }
 
 void MusicBrainzFetcher::readConfigHook(const KConfigGroup&) {
 }
 
 void MusicBrainzFetcher::setLimit(int limit_) {
   m_limit = qBound(1, limit_, MUSICBRAINZ_MAX_RETURNS_TOTAL);
 }
 
 void MusicBrainzFetcher::search() {
   m_started = true;
   m_total = -1;
   m_offset = 0;
   doSearch();
 }
 
 void MusicBrainzFetcher::continueSearch() {
   m_started = true;
   doSearch();
 }
 
 void MusicBrainzFetcher::doSearch() {
   QUrl u(QString::fromLatin1(MUSICBRAINZ_API_URL));
   // all searches are for musical releases since Tellico only tracks albums
   u.setPath(u.path() + QStringLiteral("release"));
 
   QString queryString;
   switch(request().key()) {
     case Title:
       queryString = QStringLiteral("release:\"%1\"").arg(request().value());
       break;
 
     case Person:
       queryString = QStringLiteral("artist:\"%1\"").arg(request().value());
       break;
 
     case UPC:
       queryString = QStringLiteral("barcode:\"%1\"").arg(request().value());
       break;
 
     case Keyword:
     case Raw:
       queryString = request().value();
       break;
 
     default:
       myWarning() << "key not recognized: " << request().key();
       stop();
       return;
   }
   QUrlQuery q;
   q.addQueryItem(QStringLiteral("query"), queryString);
   q.addQueryItem(QStringLiteral("limit"), QString::number(m_limit));
   q.addQueryItem(QStringLiteral("offset"), QString::number(m_offset));
   q.addQueryItem(QStringLiteral("fmt"), QStringLiteral("xml"));
   u.setQuery(q);
 //  myDebug() << "url: " << u.url();
 
   m_requestTimer.start();
   m_job = KIO::storedGet(u, KIO::NoReload, KIO::HideProgressInfo);
   // see https://musicbrainz.org/doc/XML_Web_Service/Rate_Limiting#Provide_meaningful_User-Agent_strings
   m_job->addMetaData(QStringLiteral("UserAgent"), QStringLiteral("Tellico/%1 ( http://tellico-project.org )")
                                                                 .arg(QStringLiteral(TELLICO_VERSION)));
   KJobWidgets::setWindow(m_job, GUI::Proxy::widget());
   connect(m_job.data(), &KJob::result,
           this, &MusicBrainzFetcher::slotComplete);
 }
 
 void MusicBrainzFetcher::stop() {
   if(!m_started) {
     return;
   }
   if(m_job) {
     m_job->kill();
     m_job = nullptr;
   }
   m_started = false;
   emit signalDone(this);
 }
 
 void MusicBrainzFetcher::slotComplete(KJob* ) {
   if(m_job->error()) {
     m_job->uiDelegate()->showErrorMessage();
     stop();
     return;
   }
 
   QByteArray data = m_job->data();
   if(data.isEmpty()) {
     myDebug() << "no data";
     stop();
     return;
   }
   // see bug 319662. If fetcher is cancelled, job is killed
   // if the pointer is retained, it gets double-deleted
   m_job = nullptr;
 
 #if 0
   myWarning() << "Remove debug from musicbrainzfetcher.cpp";
   QFile f(QStringLiteral("/tmp/test.xml"));
   if(f.open(QIODevice::WriteOnly)) {
     QTextStream t(&f);
     t.setCodec("UTF-8");
     t << data;
   }
   f.close();
 #endif
 
   if(m_total == -1) {
     QDomDocument dom;
     if(!dom.setContent(data, false)) {
       myWarning() << "server did not return valid XML:" << data;
       stop();
       return;
     }
     // total is /metadata/release-list/@count
     QDomNode n = dom.documentElement().namedItem(QStringLiteral("release-list"));
     QDomElement e = n.toElement();
     if(!e.isNull()) {
       m_total = e.attribute(QStringLiteral("count")).toInt();
 //      myDebug() << "total = " << m_total;
     }
   }
 
   if(!m_xsltHandler) {
     initXSLTHandler();
     if(!m_xsltHandler) { // probably an error somewhere in the stylesheet loading
       stop();
       return;
     }
   }
 
   // assume always utf-8
   QString str = m_xsltHandler->applyStylesheet(QString::fromUtf8(data.constData(), data.size()));
   Import::TellicoImporter imp(str);
   // be quiet when loading images
   imp.setOptions(imp.options() ^ Import::ImportShowImageErrors);
   Data::CollPtr coll = imp.collection();
   if(!coll) {
     myDebug() << "no collection pointer";
     stop();
     return;
   }
 
   int count = 0;
   Data::EntryList entries = coll->entries();
   foreach(Data::EntryPtr entry, entries) {
     if(count >= m_limit) {
       break;
     }
     if(!m_started) {
       // might get aborted
       break;
     }
 
     FetchResult* r = new FetchResult(this, entry);
     m_entries.insert(r->uid, Data::EntryPtr(entry));
     emit signalResultFound(r);
     ++count;
   }
 
   m_offset += count;
   m_hasMoreResults = m_offset <= m_total;
 
   stop(); // required
 }
 
 Tellico::Data::EntryPtr MusicBrainzFetcher::fetchEntryHook(uint uid_) {
   Data::EntryPtr entry = m_entries[uid_];
   if(!entry) {
     myWarning() << "no entry in dict";
     return Data::EntryPtr();
   }
 
   QString mbid = entry->field(QStringLiteral("mbid"));
   if(mbid.isEmpty()) {
     return entry;
   }
 
   QUrl u(QString::fromLatin1(MUSICBRAINZ_API_URL));
   u.setPath(u.path() + QStringLiteral("release/") + mbid);
   QUrlQuery q;
   q.addQueryItem(QStringLiteral("fmt"), QStringLiteral("xml"));
   q.addQueryItem(QStringLiteral("inc"), QStringLiteral("artists+recordings+release-groups+labels+url-rels"));
   u.setQuery(q);
 //  myDebug() << u;
 
   // limit to one request per second
   while(m_requestTimer.elapsed() < 1000) {
     QThread::msleep(300);
   }
   m_requestTimer.start();
 
   KIO::StoredTransferJob* dataJob = KIO::storedGet(u, KIO::NoReload, KIO::HideProgressInfo);
   dataJob->addMetaData(QStringLiteral("UserAgent"), QStringLiteral("Tellico/%1 ( http://tellico-project.org )")
                                                                 .arg(QStringLiteral(TELLICO_VERSION)));
   if(!dataJob->exec()) {
     myDebug() << "Failed to load" << u;
     return entry;
   }
   const QString output = XMLHandler::readXMLData(dataJob->data());
 #if 0
   myWarning() << "Remove output debug from musicbrainzfetcher.cpp";
   QFile f(QStringLiteral("/tmp/test2.xml"));
   if(f.open(QIODevice::WriteOnly)) {
     QTextStream t(&f);
     t.setCodec("UTF-8");
     t << output;
   }
   f.close();
 #endif
 
   Import::TellicoImporter imp(m_xsltHandler->applyStylesheet(output));
   // be quiet when loading images
   imp.setOptions(imp.options() ^ Import::ImportShowImageErrors);
   Data::CollPtr coll = imp.collection();
 //  getTracks(entry);
   if(!coll || coll->entries().isEmpty()) {
     myWarning() << "no collection pointer or no entries";
     return entry;
   }
 
   if(coll->entryCount() > 1) {
     myDebug() << "weird, more than one entry found";
   }
 
   // don't want to include id
   coll->removeField(QStringLiteral("mbid"));
 
   entry = coll->entries().front();
   m_entries.insert(uid_, entry); // replaces old value
   return entry;
 }
 
 void MusicBrainzFetcher::initXSLTHandler() {
   QString xsltfile = DataFileRegistry::self()->locate(QStringLiteral("musicbrainz2tellico.xsl"));
   if(xsltfile.isEmpty()) {
     myWarning() << "can not locate musicbrainz2tellico.xsl.";
     return;
   }
 
   QUrl u = QUrl::fromLocalFile(xsltfile);
 
   delete m_xsltHandler;
   m_xsltHandler = new XSLTHandler(u);
   if(!m_xsltHandler->isValid()) {
     myWarning() << "error in musicbrainz2tellico.xsl.";
     delete m_xsltHandler;
     m_xsltHandler = nullptr;
     return;
   }
 }
 
 Tellico::Fetch::FetchRequest MusicBrainzFetcher::updateRequest(Data::EntryPtr entry_) {
   const QString barcode = entry_->field(QStringLiteral("barcode"));
   if(!barcode.isEmpty()) {
     return FetchRequest(UPC, barcode);
   }
 
   const QString title = entry_->field(QStringLiteral("title"));
   const QString artist = entry_->field(QStringLiteral("artist"));
   if(artist.isEmpty() && !title.isEmpty()) {
     return FetchRequest(Title, title);
   } else if(title.isEmpty() && !artist.isEmpty()) {
     return FetchRequest(Person, artist);
   } else if(!title.isEmpty() && !artist.isEmpty()) {
     return FetchRequest(Raw, QStringLiteral("release:\"%1\" AND artist:\"%2\"").arg(title, artist));
   }
   return FetchRequest();
 }
 
 Tellico::Fetch::ConfigWidget* MusicBrainzFetcher::configWidget(QWidget* parent_) const {
   return new MusicBrainzFetcher::ConfigWidget(parent_, this);
 }
 
 QString MusicBrainzFetcher::defaultName() {
   return QStringLiteral("MusicBrainz"); // no translation
 }
 
 QString MusicBrainzFetcher::defaultIcon() {
   return favIcon("https://musicbrainz.org");
 }
 
 Tellico::StringHash MusicBrainzFetcher::allOptionalFields() {
   StringHash hash;
 //  hash[QStringLiteral("nationality")] = i18n("Nationality");
   hash[QStringLiteral("barcode")] = i18n("Barcode");
   return hash;
 }
 
 MusicBrainzFetcher::ConfigWidget::ConfigWidget(QWidget* parent_, const MusicBrainzFetcher* fetcher_)
     : Fetch::ConfigWidget(parent_) {
   QVBoxLayout* l = new QVBoxLayout(optionsWidget());
   l->addWidget(new QLabel(i18n("This source has no options."), optionsWidget()));
   l->addStretch();
 
   // now add additional fields widget
   addFieldsWidget(MusicBrainzFetcher::allOptionalFields(), fetcher_ ? fetcher_->optionalFields() : QStringList());
 }
 
 void MusicBrainzFetcher::ConfigWidget::saveConfigHook(KConfigGroup&) {
 }
 
 QString MusicBrainzFetcher::ConfigWidget::preferredName() const {
   return MusicBrainzFetcher::defaultName();
 }