File indexing completed on 2024-05-12 16:46:32

 /***************************************************************************
     Copyright (C) 2007-2009 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 "pdfimporter.h"
 #include "tellicoimporter.h"
 #include "xslthandler.h"
 #include "xmphandler.h"
 #include "../collections/bibtexcollection.h"
 #include "../fieldformat.h"
 #include "../core/filehandler.h"
 #include "../core/netaccess.h"
 #include "../images/imagefactory.h"
 #include "../utils/guiproxy.h"
 #include "../fetch/fetchmanager.h"
 #include "../progressmanager.h"
 #include "../utils/cursorsaver.h"
 #include "../entryupdatejob.h"
 #include "../utils/datafileregistry.h"
 #include "../tellico_debug.h"
 
 #include <KMessageBox>
 #include <KLocalizedString>
 
 #include <QString>
 #include <QPixmap>
 #include <QApplication>
 #include <QFile>
 #include <QScopedPointer>
 
 #include <config.h>
 #ifdef HAVE_POPPLER
 #include <poppler-qt5.h>
 #endif
 
 namespace {
   static const int PDF_FILE_PREVIEW_SIZE = 196;
 }
 
 using Tellico::Import::PDFImporter;
 
 PDFImporter::PDFImporter(const QUrl& url_) : Importer(url_), m_cancelled(false) {
 }
 
 PDFImporter::PDFImporter(const QList<QUrl>& urls_) : Importer(urls_), m_cancelled(false) {
 }
 
 bool PDFImporter::canImport(int type_) const {
   return type_ == Data::Collection::Bibtex;
 }
 
 Tellico::Data::CollPtr PDFImporter::collection() {
   QString xsltFile = DataFileRegistry::self()->locate(QStringLiteral("xmp2tellico.xsl"));
   if(xsltFile.isEmpty()) {
     myWarning() << "can not locate xmp2tellico.xsl";
     return Data::CollPtr();
   }
 
   ProgressItem& item = ProgressManager::self()->newProgressItem(this, progressLabel(), true);
   item.setTotalSteps(urls().count());
   connect(&item, &Tellico::ProgressItem::signalCancelled, this, &Tellico::Import::PDFImporter::slotCancel);
   ProgressItem::Done done(this);
   const bool showProgress = options() & ImportProgress;
 
   QUrl u = QUrl::fromLocalFile(xsltFile);
 
   XSLTHandler xsltHandler(u);
   if(!xsltHandler.isValid()) {
     myWarning() << "invalid xslt in xmp2tellico.xsl";
     return Data::CollPtr();
   }
 
   bool hasDOI = false;
   bool hasArxiv = false;
 
   uint j = 0;
 
   Data::CollPtr coll;
   XMPHandler xmpHandler;
   QList<QUrl> list = urls();
   for(QList<QUrl>::Iterator it = list.begin(); it != list.end() && !m_cancelled; ++it, ++j) {
     const QScopedPointer<FileHandler::FileRef> ref(FileHandler::fileRef(*it));
     if(!ref->isValid()) {
       continue;
     }
 
     Data::CollPtr newColl;
     Data::EntryPtr entry;
 
     QString xmp = xmpHandler.extractXMP(ref->fileName());
     //  myDebug() << xmp;
     if(xmp.isEmpty()) {
       setStatusMessage(i18n("Tellico was unable to read any metadata from the PDF file."));
     } else {
       setStatusMessage(QString());
 #if 0
       myWarning() << "Remove debug from pdfimporter.cpp";
       QFile f(QString::fromLatin1("/tmp/test-xmp.xml"));
       if(f.open(QIODevice::WriteOnly)) {
         QTextStream t(&f);
         t.setCodec("UTF-8");
         t << xmp;
       }
       f.close();
 #endif
       Import::TellicoImporter importer(xsltHandler.applyStylesheet(xmp));
       newColl = importer.collection();
       if(!newColl || newColl->entryCount() == 0) {
         myWarning() << "no collection found";
         setStatusMessage(i18n("Tellico was unable to read any metadata from the PDF file."));
       } else {
         entry = newColl->entries().front();
         hasDOI |= !entry->field(QStringLiteral("doi")).isEmpty();
         // the XMP handler has a habit of inserting empty values surrounded by parentheses
         QRegularExpression rx(QLatin1String("^\\(\\s*\\)$"));
         foreach(Data::FieldPtr field, newColl->fields()) {
           QString value = entry->field(field);
           if(value.contains(rx)) {
             entry->setField(field, QString());
           }
         }
       }
     }
 
     if(!newColl) {
       newColl = new Data::BibtexCollection(true);
     }
     if(!entry) {
       entry = new Data::Entry(newColl);
       newColl->addEntries(entry);
     }
 
 #ifdef HAVE_POPPLER
 
     // now load from poppler
     Poppler::Document* doc = Poppler::Document::load(ref->fileName());
     if(doc && !doc->isLocked()) {
       // now the question is, do we overwrite XMP data with Poppler data?
       // for now, let's say yes conditionally
       QString s = doc->info(QStringLiteral("Title")).simplified();
       if(!s.isEmpty()) {
         entry->setField(QStringLiteral("title"), s);
       }
       // author could be separated by commas, "and" or whatever
       // we're not going to overwrite it
       if(entry->field(QStringLiteral("author")).isEmpty()) {
         QRegularExpression rx(QLatin1String("\\s*(\\s+and\\s+|,|;)\\s*"));
         QStringList authors = doc->info(QStringLiteral("Author")).simplified().split(rx);
         entry->setField(QStringLiteral("author"), authors.join(FieldFormat::delimiterString()));
       }
       s = doc->info(QStringLiteral("Keywords")).simplified();
       if(!s.isEmpty()) {
         // keywords are also separated by semi-colons in poppler
         entry->setField(QStringLiteral("keyword"), s);
       }
 
       // now parse the first page text and try to guess
       Poppler::Page* page = doc->page(0);
       if(page) {
         // a null rectangle means get all text on page
         QString text = page->text(QRectF());
         // borrowed from Referencer
         QRegularExpression rx(QLatin1String("(?:"
                                             "(?:[Dd][Oo][Ii]:? *)"
                                             "|"
                                             "(?:[Dd]igital *[Oo]bject *[Ii]dentifier:? *)"
                                             ")"
                                             "("
                                             "[^\\.\\s]+"
                                             "\\."
                                             "[^\\/\\s]+"
                                             "\\/"
                                             "[^\\s]+"
                                             ")"));
         QRegularExpressionMatch m = rx.match(text);
         if(m.hasMatch()) {
           QString doi = m.captured(1);
           myLog() << "in PDF file, found DOI:" << doi;
           entry->setField(QStringLiteral("doi"), doi);
           hasDOI = true;
         }
         rx = QRegularExpression(QLatin1String("arXiv:"
                                               "("
                                               "[^\\/\\s]+"
                                               "[\\/\\.]"
                                               "[^\\s]+"
                                               ")"));
         m = rx.match(text);
         if(m.hasMatch()) {
           QString arxiv = m.captured(1);
           myLog() << "in PDF file, found arxiv:" << arxiv;
           if(!entry->collection()->hasField(QStringLiteral("arxiv"))) {
             Data::FieldPtr field(new Data::Field(QStringLiteral("arxiv"), i18n("arXiv ID")));
             field->setCategory(i18n("Publishing"));
             entry->collection()->addField(field);
           }
           entry->setField(QStringLiteral("arxiv"), arxiv);
           hasArxiv = true;
         }
 
         delete page;
       }
     } else {
       myDebug() << "unable to read PDF info (poppler)";
     }
     delete doc;
 #endif
 
     entry->setField(QStringLiteral("url"), (*it).url());
     // always an article?
     entry->setField(QStringLiteral("entry-type"), QStringLiteral("article"));
 
     QPixmap pix = NetAccess::filePreview(QUrl::fromLocalFile(ref->fileName()), PDF_FILE_PREVIEW_SIZE);
     if(pix.isNull()) {
       myDebug() << "No file preview from pdf";
     } else {
       // is png best option?
       QString id = ImageFactory::addImage(pix, QStringLiteral("PNG"));
       if(!id.isEmpty()) {
         Data::FieldPtr field = newColl->fieldByName(QStringLiteral("cover"));
         if(!field && !newColl->imageFields().isEmpty()) {
           field = newColl->imageFields().front();
         } else if(!field) {
           field = new Data::Field(QStringLiteral("cover"), i18n("Front Cover"), Data::Field::Image);
           newColl->addField(field);
         }
         entry->setField(field, id);
       }
     }
     if(coll) {
       coll->addEntries(newColl->entries());
     } else {
       coll = newColl;
     }
 
     if(showProgress) {
       ProgressManager::self()->setProgress(this, j+1);
       qApp->processEvents();
     }
   }
 
   if(m_cancelled) {
     return Data::CollPtr();
   }
 
   if(hasDOI) {
     Fetch::FetcherVec vec = Fetch::Manager::self()->createUpdateFetchers(coll->type(), Fetch::DOI);
     if(vec.isEmpty() && GUI::Proxy::widget()) {
       GUI::CursorSaver cs(Qt::ArrowCursor);
       KMessageBox::information(GUI::Proxy::widget(),
                               i18n("Tellico is able to download information about entries with a DOI from "
                                    "CrossRef.org. However, you must create an CrossRef account and add a new "
                                    "data source with your account information."),
                               QString(),
                               QStringLiteral("CrossRefSourceNeeded"));
     } else {
       foreach(Fetch::Fetcher::Ptr fetcher, vec) {
         foreach(Data::EntryPtr entry, coll->entries()) {
           KJob* job = new EntryUpdateJob(this, entry, fetcher);
           job->exec();
         }
       }
     }
   }
 
   if(m_cancelled) {
     return Data::CollPtr();
   }
 
   if(hasArxiv) {
     Fetch::FetcherVec vec = Fetch::Manager::self()->createUpdateFetchers(coll->type(), Fetch::ArxivID);
     foreach(Fetch::Fetcher::Ptr fetcher, vec) {
       foreach(Data::EntryPtr entry, coll->entries()) {
         KJob* job = new EntryUpdateJob(this, entry, fetcher);
         job->exec();
       }
     }
   }
 
   // finally
   foreach(Data::EntryPtr entry, coll->entries()) {
     if(entry->title().isEmpty()) {
       // use file name
       QUrl u = QUrl::fromLocalFile(entry->field(QStringLiteral("url")));
       entry->setField(QStringLiteral("title"), u.fileName());
     }
   }
 
   if(m_cancelled) {
     return Data::CollPtr();
   }
   return coll;
 }
 
 void PDFImporter::slotCancel() {
   m_cancelled = true;
 }