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/************************************************************************
**
** Copyright (C) 2020-2021 Kevin B. Hendricks, Stratford, Ontario, Canada
**
** This file is part of PageEdit.
**
** PageEdit 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 3 of the License, or
** (at your option) any later version.
**
** PageEdit 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 PageEdit. If not, see <http://www.gnu.org/licenses/>.
**
*************************************************************************/
#include <QString>
#include <QUrl>
#include <QApplication>
#include <QWidgetList>
#include <QDebug>
#include "Utility.h"
#include "MainWindow.h"
#include "URLInterceptor.h"
#define INTERCEPTDEBUG 0
URLInterceptor::URLInterceptor(QObject *parent)
: QWebEngineUrlRequestInterceptor(parent)
{
}
void URLInterceptor::interceptRequest(QWebEngineUrlRequestInfo &info)
{
#if INTERCEPTDEBUG
// Debug: output all requests
qDebug() << "-----";
qDebug() << "method: " << info.requestMethod();
qDebug() << "party: " << info.firstPartyUrl();
qDebug() << "request" << info.requestUrl();
qDebug() << "navtype: " << info.navigationType();
qDebug() << "restype: " << info.resourceType();
qDebug() << "ActiveWindow: " << qApp->activeWindow();
#endif
if (info.requestMethod() != "GET") {
info.block(true);
qDebug() << "Warning: URLInterceptor Blocking POST request from " << info.firstPartyUrl();
return;
}
QUrl destination(info.requestUrl());
QUrl sourceurl(info.firstPartyUrl());
// Finally let the navigation type determine what to verify against:
// Use firstPartyURL when NavigationTypeLink or NavigationTypeOther (ie. a true source url)
// Otherwise if we Typed it in it is from us
if (info.navigationType() == QWebEngineUrlRequestInfo::NavigationTypeTyped) {
sourceurl = destination;
}
// verify all url file schemes before allowing
if (destination.scheme() == "file") {
QString bookfolder;
QString usercssfolder = Utility::DefinePrefsDir() + "/";;
QString sourcefolder = sourceurl.toLocalFile();
// possible for multiple main windows to exist
// create a topLevelWidget equivalent to screen out stale
// QWidget more safely
const QWidgetList all_widgets = QApplication::allWidgets();
foreach(QWidget* w, all_widgets) {
if (w && w->isWindow() && w->windowType() != Qt::Desktop) {
MainWindow * mw = qobject_cast<MainWindow *>(w);
if (mw) {
QString sandbox = mw->GetSandBoxPath();
if (!sandbox.isEmpty() && sourcefolder.startsWith(sandbox)) {
// found the correct main window
bookfolder = sandbox;
#if INTERCEPTDEBUG
qDebug() << "mainwin: " << mw;
qDebug() << "book: " << bookfolder;
qDebug() << "usercss: " << usercssfolder;
qDebug() << "party: " << info.firstPartyUrl();
qDebug() << "source: " << sourcefolder;
#endif
break;
}
}
}
}
// if can not determine book folder block it
if (bookfolder.isEmpty()) {
info.block(true);
qDebug() << "Error: URLInterceptor can not determine book folder so all file: requests blocked";
return;
}
// path must be inside of bookfolder, Note it is legal for it not to exist
QString destpath = destination.toLocalFile();
if (destpath.startsWith(bookfolder)) {
info.block(false);
return;
}
// or path must be inside the PageEdit's user preferences directory
if (destpath.startsWith(usercssfolder)) {
info.block(false);
return;
}
// otherwise block it to prevent access to any user file path
info.block(true);
qDebug() << "Warning: URLInterceptor blocking access to url " << destination;
qDebug() << " from " << info.firstPartyUrl();
return;
}
// allow others to proceed
info.block(false);
return;
}
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