File indexing completed on 2025-04-27 06:57:32

 /*
     This file is part of the syndication library
     SPDX-FileCopyrightText: 2019 Laurent Montel <montel@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "loaderutil_p.h"
 #include <QDebug>
 #include <QRegularExpression>
 
 //#define DEBUG_PARSING_FEED
 #ifdef DEBUG_PARSING_FEED
 #include <QFile>
 #include <QTextStream>
 #endif
 QUrl Syndication::LoaderUtil::parseFeed(const QByteArray &data, const QUrl &url)
 {
 #ifdef DEBUG_PARSING_FEED
     qDebug() << " QUrl Syndication::LoaderUtil::parseFeed(const QByteArray &data, const QUrl &url)";
     QFile headerFile(QStringLiteral("/tmp/bb.txt"));
     headerFile.open(QIODevice::WriteOnly | QIODevice::Text);
     QTextStream outHeaderStream(&headerFile);
     outHeaderStream << data;
     headerFile.close();
 #endif
     QUrl discoveredFeedURL;
     QString str = QString::fromLatin1(data.constData()).simplified();
     QString s2;
     // QTextStream ts( &str, QIODevice::WriteOnly );
     // ts << data.data();
 
     // "<[\\s]link[^>]*rel[\\s]=[\\s]\\\"[\\s]alternate[\\s]\\\"[^>]*>"
     // "type[\\s]=[\\s]\\\"application/rss+xml\\\""
     // "href[\\s]=[\\s]\\\"application/rss+xml\\\""
 
     QRegularExpression rx(QStringLiteral("(?:REL)[^=]*=[^sAa]*(?:service.feed|ALTERNATE)[^sAa]*"
                                          "[\\s]*type[^=]*=\"application/rss\\+xml\"[^s][^s](?:[^>]*)"
                                          "[\\s]*[\\s]*[^s]*(?:HREF)[^=]*=[^A-Z0-9-_~,./$]*([^'\">\\s]*)"),
                           QRegularExpression::CaseInsensitiveOption);
     QRegularExpressionMatch match;
     if ((match = rx.match(str)).hasMatch()) {
         s2 = match.captured(1);
     } else {
         const QRegularExpression rx2(QStringLiteral("(?:REL)[^=]*=[^sAa]*(?:service.feed|ALTERNATE)"
                                                     "[\\s]*[^s][^s](?:[^>]*)(?:HREF)[^=]*=[^A-Z0-9-_~,./$]*([^'\">\\s]*)"),
                                      QRegularExpression::CaseInsensitiveOption);
         if ((match = rx2.match(str)).hasMatch()) {
             s2 = match.captured(1);
         } else {
             // does not support Atom/RSS autodiscovery.. try finding feeds by brute force....
             QStringList feeds;
             QString host = url.host();
             rx.setPattern(QStringLiteral("(?:<A )[^H]*(?:HREF)[^=]*=[^A-Z0-9-_~,./]*([^'\">\\s]*)"));
             QRegularExpressionMatchIterator iter = rx.globalMatch(str);
             while (iter.hasNext()) {
                 match = iter.next();
                 s2 = match.captured(1);
                 if (s2.endsWith(QLatin1String(".rdf")) //
                     || s2.endsWith(QLatin1String(".rss")) //
                     || s2.endsWith(QLatin1String(".xml"))) {
                     feeds.append(s2);
                 }
             }
 
             // Prefer feeds on same host
             auto it = std::find_if(feeds.cbegin(), feeds.cend(), [&host](const QString &s) {
                 return QUrl(s).host() == host;
             });
             if (it != feeds.cend()) {
                 s2 = *it;
             }
         }
     }
 
     if (s2.isNull()) {
         return discoveredFeedURL;
     }
 
     if (QUrl(s2).isRelative()) {
         if (s2.startsWith(QLatin1String("//"))) {
             s2.prepend(url.scheme() + QLatin1Char(':'));
             discoveredFeedURL = QUrl(s2);
         } else if (s2.startsWith(QLatin1Char('/'))) {
             discoveredFeedURL = url;
             discoveredFeedURL.setPath(s2);
         } else {
             discoveredFeedURL = url;
             discoveredFeedURL.setPath(discoveredFeedURL.path() + QLatin1Char('/') + s2);
         }
     } else {
         discoveredFeedURL = QUrl(s2);
     }
 
     return discoveredFeedURL;
 }