viewer_p.cpp 112 KB
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/*
  Copyright (c) 1997 Markus Wuebben <markus.wuebben@kde.org>
  Copyright (C) 2009 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.net
  Copyright (c) 2009 Andras Mantia <andras@kdab.net>
  Copyright (c) 2010 Torgny Nyblom <nyblom@kde.org>
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  Copyright (C) 2011-2016 Laurent Montel <montel@kde.org>
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  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.,
  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
//#define MESSAGEVIEWER_READER_HTML_DEBUG 1
#include "viewer_p.h"
#include "viewer.h"
#include "messageviewer_debug.h"
#include "viewer/objecttreeemptysource.h"
#include "viewer/objecttreeviewersource.h"
#include "messagedisplayformatattribute.h"
#include "scamdetection/scamdetectionwarningwidget.h"
#include "scamdetection/scamattribute.h"
#include "adblock/adblockmanager.h"
#include "viewer/mimeparttree/mimeparttreeview.h"
#include "widgets/openattachmentfolderwidget.h"
#include "messageviewer/headerstyle.h"
#include "messageviewer/headerstrategy.h"
#include "kpimtextedit/slidecontainer.h"
#include "Gravatar/GravatarCache"
#include "gravatarsettings.h"
#include "job/attachmenteditjob.h"
#include "job/modifymessagedisplayformatjob.h"
#include "viewerplugins/viewerplugintoolmanager.h"
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#include <KContacts/VCardConverter>
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#ifdef MESSAGEVIEWER_READER_HTML_DEBUG
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#include <MimeMessagePart/FileHtmlWriter>
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#include "htmlwriter/teehtmlwriter.h"
#endif
#include <unistd.h> // link()
#include <errno.h>
//KDE includes
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QAction>
#include <KActionCollection>
#include <KActionMenu>
#include <KCharsets>
#include <QWebView>
#include <QWebFrame>
#include <QMenu>
#include <KMessageBox>
#include <KMimeTypeChooser>
#include <KMimeTypeTrader>
#include <KRun>
#include <KSelectAction>
#include <KSharedConfigPtr>
#include <KStandardGuiItem>
#include <QTemporaryDir>
#include <KToggleAction>
#include <QIcon>
#include <kfileitemactions.h>
#include <KLocalizedString>
#include <QMimeData>
#include <KEmailAddress>
#include <AkonadiCore/ItemModifyJob>
#include <AkonadiCore/ItemCreateJob>

#include <Libkleo/CryptoBackendFactory>
#include <Libkleo/CryptoBackend>

#include <MailTransport/mailtransport/errorattribute.h>

//Qt includes
#include <QClipboard>
#include <QDesktopWidget>
#include <QFileInfo>
#include <QItemSelectionModel>
#include <QSignalMapper>
#include <QSplitter>
#include <QTreeView>
#include <QPrinter>
#include <QPrintDialog>
#include <QMimeDatabase>
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#include <QWheelEvent>
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//libkdepim
#include "Libkdepim/BroadcastStatus"
#include <MessageCore/AttachmentPropertiesDialog>
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#include <PimCommon/KPimPrintPreviewDialog>
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#include <AkonadiCore/collection.h>
#include <AkonadiCore/itemfetchjob.h>
#include <AkonadiCore/itemfetchscope.h>
#include <Akonadi/KMime/MessageStatus>
#include <Akonadi/KMime/SpecialMailCollections>
#include <AkonadiCore/attributefactory.h>
#include <Akonadi/KMime/MessageParts>

//own includes
#include "widgets/attachmentdialog.h"
#include "viewer/attachmentstrategy.h"
#include "csshelper.h"
#include "settings/messageviewersettings.h"
#include "widgets/htmlstatusbar.h"
#include "viewer/mimeparttree/mimetreemodel.h"
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#include <MimeTreeParser/NodeHelper>
#include <MimeTreeParser/ObjectTreeParser>
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#include "viewer/urlhandlermanager.h"
#include "messageviewer/messageviewerutil.h"
#include "widgets/vcardviewer.h"
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#ifdef MESSAGEVIEWER_USE_QTWEBENGINE
#include "findbar/findbarwebengineview.h"
#include "viewer/webengine/mailwebengineview.h"
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#include <QWebEngineSettings>
#include "htmlwriter/webengineparthtmlwriter.h"
#include <widgets/mailsourcewebengineviewer.h>
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#include <MessageViewer/WebHitTestResult>
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#else
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#include <QWebElement>
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#include "widgets/mailsourceviewer.h"
#include "htmlwriter/webkitparthtmlwriter.h"
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#include "viewer/webview/mailwebview.h"
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#include "findbar/findbarwebview.h"
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#endif
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#include "header/headerstylemenumanager.h"

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#include <MimeTreeParser/BodyPart>
#include <MimeTreeParser/HtmlWriter>
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#include <MessageCore/StringUtil>

#include <MessageCore/NodeHelper>
#include "MessageCore/MessageCoreSettings"
#include <AkonadiCore/agentinstance.h>
#include <AkonadiCore/agentmanager.h>
#include <AkonadiCore/CollectionFetchJob>
#include <AkonadiCore/collectionfetchscope.h>

#include <boost/bind.hpp>
#include <KJobWidgets/KJobWidgets>
#include <QApplication>
#include <QStandardPaths>
#include <header/headerstyleplugin.h>
#include <viewerplugins/viewerplugininterface.h>
#include <widgets/zoomactionmenu.h>
#include <kpimtextedit/texttospeechwidget.h>

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#include <grantleetheme/grantleethememanager.h>
#include <grantleetheme/grantleetheme.h>

using namespace boost;
using namespace MailTransport;
using namespace MessageViewer;
using namespace MessageCore;

static QAtomicInt _k_attributeInitialized;

ViewerPrivate::ViewerPrivate(Viewer *aParent, QWidget *mainWindow,
                             KActionCollection *actionCollection)
    : QObject(aParent),
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      mNodeHelper(new MimeTreeParser::NodeHelper),
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      mViewer(Q_NULLPTR),
      mFindBar(Q_NULLPTR),
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      mAttachmentStrategy(0),
      mUpdateReaderWinTimer(0),
      mResizeTimer(0),
      mOldGlobalOverrideEncoding(QStringLiteral("---")),   // init with dummy value
      mMsgDisplay(true),
      mCSSHelper(0),
      mMainWindow(mainWindow),
      mActionCollection(actionCollection),
      mCopyAction(0),
      mCopyURLAction(0),
      mUrlOpenAction(0),
      mSelectAllAction(0),
      mScrollUpAction(0),
      mScrollDownAction(0),
      mScrollUpMoreAction(0),
      mScrollDownMoreAction(0),
      mHeaderOnlyAttachmentsAction(0),
      mSelectEncodingAction(0),
      mToggleFixFontAction(0),
      mToggleDisplayModeAction(0),
      mToggleMimePartTreeAction(0),
      mSpeakTextAction(0),
      mCanStartDrag(false),
      mHtmlWriter(0),
      mSavedRelativePosition(0),
      mDecrytMessageOverwrite(false),
      mShowSignatureDetails(false),
      mShowAttachmentQuicklist(true),
      mRecursionCountForDisplayMessage(0),
      mCurrentContent(0),
      mMessagePartNode(0),
      q(aParent),
      mShowFullToAddressList(true),
      mShowFullCcAddressList(true),
      mPreviouslyViewedItem(-1),
      mScamDetectionWarning(0),
      mOpenAttachmentFolderWidget(Q_NULLPTR),
      mSliderContainer(0),
      mShareServiceManager(Q_NULLPTR),
      mHeaderStylePlugin(Q_NULLPTR),
      mHeaderStyleMenuManager(Q_NULLPTR),
      mViewerPluginToolManager(Q_NULLPTR),
      mZoomActionMenu(Q_NULLPTR)
{
    mMimePartTree = 0;
    if (!mainWindow) {
        mMainWindow = aParent;
    }
    if (_k_attributeInitialized.testAndSetAcquire(0, 1)) {
        Akonadi::AttributeFactory::registerAttribute<MessageViewer::MessageDisplayFormatAttribute>();
        Akonadi::AttributeFactory::registerAttribute<MessageViewer::ScamAttribute>();
    }
    mShareServiceManager = new PimCommon::ShareServiceUrlManager(this);

    mDisplayFormatMessageOverwrite = MessageViewer::Viewer::UseGlobalSetting;
    mHtmlLoadExtOverride = false;

    mHtmlLoadExternalGlobalSetting = false;
    mHtmlMailGlobalSetting = false;

    mUpdateReaderWinTimer.setObjectName(QStringLiteral("mUpdateReaderWinTimer"));
    mResizeTimer.setObjectName(QStringLiteral("mResizeTimer"));

    mExternalWindow  = false;
    mPrinting = false;

    createWidgets();
    createActions();
    initHtmlWidget();
    readConfig();

    mLevelQuote = MessageViewer::MessageViewerSettings::self()->collapseQuoteLevelSpin() - 1;

    mResizeTimer.setSingleShot(true);
    connect(&mResizeTimer, &QTimer::timeout,
            this, &ViewerPrivate::slotDelayedResize);

    mUpdateReaderWinTimer.setSingleShot(true);
    connect(&mUpdateReaderWinTimer, &QTimer::timeout,
            this, &ViewerPrivate::updateReaderWin);

    connect(mColorBar, &HtmlStatusBar::clicked,
            this, &ViewerPrivate::slotToggleHtmlMode);

    // FIXME: Don't use the full payload here when attachment loading on demand is used, just
    //        like in KMMainWidget::slotMessageActivated().
    Akonadi::ItemFetchScope fs;
    fs.fetchFullPayload();
    fs.fetchAttribute<MailTransport::ErrorAttribute>();
    fs.fetchAttribute<MessageViewer::MessageDisplayFormatAttribute>();
    fs.fetchAttribute<MessageViewer::ScamAttribute>();
    mMonitor.setItemFetchScope(fs);
    connect(&mMonitor, &Akonadi::Monitor::itemChanged,
            this, &ViewerPrivate::slotItemChanged);
    connect(&mMonitor, &Akonadi::Monitor::itemRemoved,
            this, &ViewerPrivate::slotClear);
    connect(&mMonitor, &Akonadi::Monitor::itemMoved,
            this, &ViewerPrivate::slotItemMoved);
}

ViewerPrivate::~ViewerPrivate()
{
    MessageViewer::MessageViewerSettings::self()->save();
    delete mHtmlWriter; mHtmlWriter = 0;
    delete mViewer; mViewer = 0;
    delete mCSSHelper;
    mNodeHelper->forceCleanTempFiles();
    delete mNodeHelper;
}

//-----------------------------------------------------------------------------
KMime::Content *ViewerPrivate::nodeFromUrl(const QUrl &url) const
{
    return mNodeHelper->fromHREF(mMessage, url);
}

void ViewerPrivate::openAttachment(KMime::Content *node, const QString &name)
{
    if (!node) {
        return;
    }

    if (node->contentType(false)) {
        if (node->contentType()->mimeType() == "text/x-moz-deleted") {
            return;
        }
        if (node->contentType()->mimeType() == "message/external-body") {
            if (node->contentType()->hasParameter(QStringLiteral("url"))) {
                const QString url = node->contentType()->parameter(QStringLiteral("url"));
                KRun::runUrl(QUrl(url), QStringLiteral("text/html"), q);
                return;
            }
        }
    }

    const bool isEncapsulatedMessage = node->parent() && node->parent()->bodyIsMessage();
    if (isEncapsulatedMessage) {

        // the viewer/urlhandlermanager expects that the message (mMessage) it is passed is the root when doing index calculation
        // in urls. Simply passing the result of bodyAsMessage() does not cut it as the resulting pointer is a child in its tree.
        KMime::Message::Ptr m = KMime::Message::Ptr(new KMime::Message);
        m->setContent(node->parent()->bodyAsMessage()->encodedContent());
        m->parse();
        atmViewMsg(m);
        return;
    }
    // determine the MIME type of the attachment
    // prefer the value of the Content-Type header
    QMimeDatabase mimeDb;
    auto mimetype = mimeDb.mimeTypeForName(QString::fromLatin1(node->contentType()->mimeType().toLower()));
    if (mimetype.isValid() && mimetype.inherits(KContacts::Addressee::mimeType())) {
        showVCard(node);
        return;
    }

    // special case treatment on mac and windows
    QString atmName = name;
    if (name.isEmpty()) {
        atmName = mNodeHelper->tempFileUrlFromNode(node).toLocalFile();
    }
    if (Util::handleUrlWithQDesktopServices(atmName)) {
        return;
    }

    if (!mimetype.isValid() || mimetype.name() == QLatin1String("application/octet-stream")) {
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        mimetype = MimeTreeParser::Util::mimetype(name);
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    }
    KService::Ptr offer =
        KMimeTypeTrader::self()->preferredService(mimetype.name(), QStringLiteral("Application"));

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    const QString filenameText = MimeTreeParser::NodeHelper::fileName(node);
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    AttachmentDialog dialog(mMainWindow, filenameText, offer ? offer->name() : QString(),
                            QLatin1String("askSave_") + mimetype.name());
    const int choice = dialog.exec();

    if (choice == AttachmentDialog::Save) {
        QUrl currentUrl;
        if (Util::saveContents(mMainWindow, KMime::Content::List() << node, currentUrl)) {
            showOpenAttachmentFolderWidget(currentUrl);
        }
    } else if (choice == AttachmentDialog::Open) { // Open
        if (offer) {
            attachmentOpenWith(node, offer);
        } else {
            attachmentOpen(node);
        }
    } else if (choice == AttachmentDialog::OpenWith) {
        attachmentOpenWith(node);
    } else { // Cancel
        qCDebug(MESSAGEVIEWER_LOG) << "Canceled opening attachment";
    }

}

bool ViewerPrivate::deleteAttachment(KMime::Content *node, bool showWarning)
{
    if (!node) {
        return true;
    }
    KMime::Content *parent = node->parent();
    if (!parent) {
        return true;
    }

    QList<KMime::Content *> extraNodes = mNodeHelper->extraContents(mMessage.data());
    if (extraNodes.contains(node->topLevel())) {
        KMessageBox::error(mMainWindow,
                           i18n("Deleting an attachment from an encrypted or old-style mailman message is not supported."),
                           i18n("Delete Attachment"));
        return true; //cancelled
    }

    if (showWarning && KMessageBox::warningContinueCancel(mMainWindow,
            i18n("Deleting an attachment might invalidate any digital signature on this message."),
            i18n("Delete Attachment"), KStandardGuiItem::del(), KStandardGuiItem::cancel(),
            QStringLiteral("DeleteAttachmentSignatureWarning"))
            != KMessageBox::Continue) {
        return false; //cancelled
    }
    //don't confuse the model
#ifndef QT_NO_TREEVIEW
    mMimePartTree->clearModel();
#endif
    QString filename;
    QString name;
    QByteArray mimetype;
    if (node->contentDisposition(false)) {
        filename = node->contentDisposition()->filename();
    }

    if (node->contentType(false)) {
        name = node->contentType()->name();
        mimetype = node->contentType()->mimeType();
    }

    // text/plain part:
    KMime::Content *deletePart = new KMime::Content(parent);
    deletePart->contentType()->setMimeType("text/x-moz-deleted");
    deletePart->contentType()->setName(QStringLiteral("Deleted: %1").arg(name), "utf8");
    deletePart->contentDisposition()->setDisposition(KMime::Headers::CDattachment);
    deletePart->contentDisposition()->setFilename(QStringLiteral("Deleted: %1").arg(name));

    deletePart->contentType()->setCharset("utf-8");
    deletePart->contentTransferEncoding()->setEncoding(KMime::Headers::CE7Bit);
    QByteArray bodyMessage = QByteArray("\nYou deleted an attachment from this message. The original MIME headers for the attachment were:");
    bodyMessage += ("\nContent-Type: ") + mimetype;
    bodyMessage += ("\nname=\"") + name.toUtf8() + "\"";
    bodyMessage += ("\nfilename=\"") + filename.toUtf8() + "\"";
    deletePart->setBody(bodyMessage);
    parent->replaceContent(node, deletePart);

    parent->assemble();

    KMime::Message *modifiedMessage = mNodeHelper->messageWithExtraContent(mMessage.data());
#ifndef QT_NO_TREEVIEW
    mMimePartTree->mimePartModel()->setRoot(modifiedMessage);
#endif
    mMessageItem.setPayloadFromData(modifiedMessage->encodedContent());
    Akonadi::ItemModifyJob *job = new Akonadi::ItemModifyJob(mMessageItem);
    job->disableRevisionCheck();
    connect(job, &KJob::result, this, &ViewerPrivate::itemModifiedResult);
    return true;
}

void ViewerPrivate::itemModifiedResult(KJob *job)
{
    if (job->error()) {
        qCDebug(MESSAGEVIEWER_LOG) << "Item update failed:" << job->errorString();
    } else {
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        setMessageItem(mMessageItem, MimeTreeParser::Force);
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    }
}

void ViewerPrivate::editAttachment(KMime::Content *node, bool showWarning)
{
    MessageViewer::AttachmentEditJob *job = new MessageViewer::AttachmentEditJob(this);
    connect(job, &AttachmentEditJob::refreshMessage, this, &ViewerPrivate::slotRefreshMessage);
    job->setMainWindow(mMainWindow);
    job->setMessageItem(mMessageItem);
    job->setMessage(mMessage);
    job->addAttachment(node, showWarning);
    job->canDeleteJob();
}

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void ViewerPrivate::scrollToAnchor(const QString &anchor)
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{
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    mViewer->scrollToAnchor(anchor);
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}

void ViewerPrivate::createOpenWithMenu(QMenu *topMenu, const QString &contentTypeStr, bool fromCurrentContent)
{
    const KService::List offers = KFileItemActions::associatedApplications(QStringList() << contentTypeStr, QString());
    if (!offers.isEmpty()) {
        QMenu *menu = topMenu;
        QActionGroup *actionGroup = new QActionGroup(menu);

        if (fromCurrentContent) {
            connect(actionGroup, &QActionGroup::triggered, this, &ViewerPrivate::slotOpenWithActionCurrentContent);
        } else {
            connect(actionGroup, &QActionGroup::triggered, this, &ViewerPrivate::slotOpenWithAction);
        }

        if (offers.count() > 1) { // submenu 'open with'
            menu = new QMenu(i18nc("@title:menu", "&Open With"), topMenu);
            menu->menuAction()->setObjectName(QStringLiteral("openWith_submenu")); // for the unittest
            topMenu->addMenu(menu);
        }
        qCDebug(MESSAGEVIEWER_LOG) << offers.count() << "offers" << topMenu << menu;

        KService::List::ConstIterator it = offers.constBegin();
        KService::List::ConstIterator end = offers.constEnd();
        for (; it != end; ++it) {
            QAction *act = MessageViewer::Util::createAppAction(*it,
                           // no submenu -> prefix single offer
                           menu == topMenu, actionGroup, menu);
            menu->addAction(act);
        }

        QString openWithActionName;
        if (menu != topMenu) { // submenu
            menu->addSeparator();
            openWithActionName = i18nc("@action:inmenu Open With", "&Other...");
        } else {
            openWithActionName = i18nc("@title:menu", "&Open With...");
        }
        QAction *openWithAct = new QAction(menu);
        openWithAct->setText(openWithActionName);
        if (fromCurrentContent) {
            connect(openWithAct, &QAction::triggered, this, &ViewerPrivate::slotOpenWithDialogCurrentContent);
        } else {
            connect(openWithAct, &QAction::triggered, this, &ViewerPrivate::slotOpenWithDialog);
        }

        menu->addAction(openWithAct);
    } else { // no app offers -> Open With...
        QAction *act = new QAction(topMenu);
        act->setText(i18nc("@title:menu", "&Open With..."));
        if (fromCurrentContent) {
            connect(act, &QAction::triggered, this, &ViewerPrivate::slotOpenWithDialogCurrentContent);
        } else {
            connect(act, &QAction::triggered, this, &ViewerPrivate::slotOpenWithDialog);
        }
        topMenu->addAction(act);
    }
}

void ViewerPrivate::slotOpenWithDialogCurrentContent()
{
    if (!mCurrentContent) {
        return;
    }
    attachmentOpenWith(mCurrentContent);
}

void ViewerPrivate::slotOpenWithDialog()
{
    auto contents = selectedContents();
    if (contents.count() == 1) {
        attachmentOpenWith(contents.first());
    }
}

void ViewerPrivate::slotOpenWithActionCurrentContent(QAction *act)
{
    if (!mCurrentContent) {
        return;
    }
    KService::Ptr app = act->data().value<KService::Ptr>();
    attachmentOpenWith(mCurrentContent, app);
}

void ViewerPrivate::slotOpenWithAction(QAction *act)
{
    KService::Ptr app = act->data().value<KService::Ptr>();
    auto contents = selectedContents();
    if (contents.count() == 1) {
        attachmentOpenWith(contents.first(), app);
    }
}

void ViewerPrivate::showAttachmentPopup(KMime::Content *node, const QString &name, const QPoint &globalPos)
{
    prepareHandleAttachment(node, name);
    QMenu *menu = new QMenu();
    QAction *action;
    bool deletedAttachment = false;
    if (node->contentType(false)) {
        deletedAttachment = (node->contentType()->mimeType() == "text/x-moz-deleted");
    }
    const QString contentTypeStr = QLatin1String(node->contentType()->mimeType());

    QSignalMapper *attachmentMapper = new QSignalMapper(menu);
    connect(attachmentMapper, SIGNAL(mapped(int)),
            this, SLOT(slotHandleAttachment(int)));

    action = menu->addAction(QIcon::fromTheme(QStringLiteral("document-open")), i18nc("to open", "Open"));
    action->setEnabled(!deletedAttachment);
    connect(action, SIGNAL(triggered(bool)), attachmentMapper, SLOT(map()));
    attachmentMapper->setMapping(action, Viewer::Open);
    if (!deletedAttachment) {
        createOpenWithMenu(menu, contentTypeStr, true);
    }

    QMimeDatabase mimeDb;
    auto mimetype = mimeDb.mimeTypeForName(contentTypeStr);
    if (mimetype.isValid()) {
        const QStringList parentMimeType = mimetype.parentMimeTypes();
        if ((contentTypeStr == QLatin1String("text/plain")) ||
                (contentTypeStr == QLatin1String("image/png")) ||
                (contentTypeStr == QLatin1String("image/jpeg")) ||
                parentMimeType.contains(QStringLiteral("text/plain")) ||
                parentMimeType.contains(QStringLiteral("image/png")) ||
                parentMimeType.contains(QStringLiteral("image/jpeg"))
           ) {
            action = menu->addAction(i18nc("to view something", "View"));
            action->setEnabled(!deletedAttachment);
            connect(action, SIGNAL(triggered(bool)), attachmentMapper, SLOT(map()));
            attachmentMapper->setMapping(action, Viewer::View);
        }
    }

    const bool attachmentInHeader = mViewer->isAttachmentInjectionPoint(globalPos);
    const bool hasScrollbar = mViewer->hasVerticalScrollBar();
    if (attachmentInHeader && hasScrollbar) {
        action = menu->addAction(i18n("Scroll To"));
        connect(action, SIGNAL(triggered(bool)), attachmentMapper, SLOT(map()));
        attachmentMapper->setMapping(action, Viewer::ScrollTo);
    }

    action = menu->addAction(QIcon::fromTheme(QStringLiteral("document-save-as")), i18n("Save As..."));
    action->setEnabled(!deletedAttachment);
    connect(action, SIGNAL(triggered(bool)), attachmentMapper, SLOT(map()));
    attachmentMapper->setMapping(action, Viewer::Save);

    action = menu->addAction(QIcon::fromTheme(QStringLiteral("edit-copy")), i18n("Copy"));
    action->setEnabled(!deletedAttachment);
    connect(action, SIGNAL(triggered(bool)), attachmentMapper, SLOT(map()));
    attachmentMapper->setMapping(action, Viewer::Copy);

    const bool isEncapsulatedMessage = node->parent() && node->parent()->bodyIsMessage();
    const bool canChange = mMessageItem.isValid() && mMessageItem.parentCollection().isValid() &&
                           (mMessageItem.parentCollection().rights() != Akonadi::Collection::ReadOnly) &&
                           !isEncapsulatedMessage;

    if (MessageViewer::MessageViewerSettings::self()->allowAttachmentEditing()) {
        action = menu->addAction(QIcon::fromTheme(QStringLiteral("document-properties")), i18n("Edit Attachment"));
        connect(action, SIGNAL(triggered()), attachmentMapper, SLOT(map()));
        attachmentMapper->setMapping(action, Viewer::Edit);
        action->setEnabled(canChange);
    }
    action = menu->addAction(QIcon::fromTheme(QStringLiteral("edit-delete")), i18n("Delete Attachment"));
    connect(action, SIGNAL(triggered()), attachmentMapper, SLOT(map()));
    attachmentMapper->setMapping(action, Viewer::Delete);
    action->setEnabled(canChange && !deletedAttachment);
    action = menu->addAction(i18n("Properties"));
    connect(action, SIGNAL(triggered(bool)), attachmentMapper, SLOT(map()));
    attachmentMapper->setMapping(action, Viewer::Properties);
    menu->exec(globalPos);
    delete menu;
}

void ViewerPrivate::prepareHandleAttachment(KMime::Content *node, const QString &fileName)
{
    mCurrentContent = node;
    mCurrentFileName = fileName;
}

QString ViewerPrivate::createAtmFileLink(const QString &atmFileName) const
{
    QFileInfo atmFileInfo(atmFileName);

    // tempfile name is /TMP/attachmentsRANDOM/atmFileInfo.fileName()"
    const QString tmpPath = QDir::tempPath() + QLatin1Char('/') +  QLatin1String("attachments");
    QDir().mkpath(tmpPath);
    QTemporaryDir *linkDir = new QTemporaryDir(tmpPath);
    QString linkPath = linkDir->path() + atmFileInfo.fileName();
    QFile *linkFile = new QFile(linkPath);
    linkFile->open(QIODevice::ReadWrite);
    const QString linkName = linkFile->fileName();
    delete linkFile;
    delete linkDir;

    if (::link(QFile::encodeName(atmFileName), QFile::encodeName(linkName)) == 0) {
        return linkName; // success
    }
    return QString();
}

KService::Ptr ViewerPrivate::getServiceOffer(KMime::Content *content)
{
    const QString fileName = mNodeHelper->writeNodeToTempFile(content);

    const QString contentTypeStr = QLatin1String(content->contentType()->mimeType());

    // determine the MIME type of the attachment
    // prefer the value of the Content-Type header
    QMimeDatabase mimeDb;
    auto mimetype = mimeDb.mimeTypeForName(contentTypeStr);

    if (mimetype.isValid() && mimetype.inherits(KContacts::Addressee::mimeType())) {
        attachmentView(content);
        return KService::Ptr(0);
    }

    if (!mimetype.isValid() || mimetype.name() == QLatin1String("application/octet-stream")) {
        /*TODO(Andris) port when on-demand loading is done   && msgPart.isComplete() */
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        mimetype = MimeTreeParser::Util::mimetype(fileName);
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    }
    return KMimeTypeTrader::self()->preferredService(mimetype.name(), QStringLiteral("Application"));
}

KMime::Content::List ViewerPrivate::selectedContents()
{
    return mMimePartTree->selectedContents();
}

void ViewerPrivate::attachmentOpenWith(KMime::Content *node, const KService::Ptr &offer)
{
    QString name = mNodeHelper->writeNodeToTempFile(node);
    QString linkName = createAtmFileLink(name);
    QList<QUrl> lst;
    bool autoDelete = true;

    if (linkName.isEmpty()) {
        autoDelete = false;
        linkName = name;
    }

    const QFileDevice::Permissions perms = QFile::permissions(linkName);
    QFile::setPermissions(linkName, perms | QFileDevice::ReadUser | QFileDevice::WriteUser);
    const QUrl url = QUrl::fromLocalFile(linkName);
    lst.append(url);
    if (offer) {
        if ((!KRun::runService(*offer, lst, 0, autoDelete)) && autoDelete) {
            QFile::remove(url.toLocalFile());
        }
    } else {
        if ((! KRun::displayOpenWithDialog(lst, mMainWindow, autoDelete)) && autoDelete) {
            QFile::remove(url.toLocalFile());
        }
    }
}

void ViewerPrivate::attachmentOpen(KMime::Content *node)
{
    KService::Ptr offer = getServiceOffer(node);
    if (!offer) {
        qCDebug(MESSAGEVIEWER_LOG) << "got no offer";
        return;
    }
    attachmentOpenWith(node, offer);
}

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MimeTreeParser::HtmlWriter *ViewerPrivate::htmlWriter() const
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{
    return mHtmlWriter;
}

CSSHelper *ViewerPrivate::cssHelper() const
{
    return mCSSHelper;
}

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MimeTreeParser::NodeHelper *ViewerPrivate::nodeHelper() const
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{
    return mNodeHelper;
}

Viewer *ViewerPrivate::viewer() const
{
    return q;
}

Akonadi::Item ViewerPrivate::messageItem() const
{
    return mMessageItem;
}

KMime::Message::Ptr ViewerPrivate::message() const
{
    return mMessage;
}

bool ViewerPrivate::decryptMessage() const
{
    if (!MessageViewer::MessageViewerSettings::self()->alwaysDecrypt()) {
        return mDecrytMessageOverwrite;
    } else {
        return true;
    }
}

int ViewerPrivate::pointsToPixel(int pointSize) const
{
    return (pointSize * mViewer->logicalDpiY() + 36) / 72;
}

void ViewerPrivate::displaySplashPage(const QString &message)
{
    displaySplashPage(QStringLiteral("status.html"), {
        { QStringLiteral("icon"), QStringLiteral("kmail") },
        { QStringLiteral("name"), i18n("KMail") },
        { QStringLiteral("subtitle"), i18n("The KDE Mail Client") },
        { QStringLiteral("message"), message }
    });
}

void ViewerPrivate::displaySplashPage(const QString &templateName, const QVariantHash &data)
{
    mMsgDisplay = false;
    adjustLayout();

    GrantleeTheme::ThemeManager manager(QStringLiteral("splashPage"),
                                        QStringLiteral("splash.theme"),
                                        Q_NULLPTR,
                                        QStringLiteral("messageviewer/about/"));
    GrantleeTheme::Theme theme = manager.theme(QStringLiteral("default"));
    if (theme.isValid()) {
        mViewer->setHtml(theme.render(templateName, data),
                         QUrl::fromLocalFile(theme.absolutePath() + QLatin1Char('/')));
    } else {
        qCDebug(MESSAGEVIEWER_LOG) << "Theme error: failed to find splash theme";
    }
    mViewer->show();
}

void ViewerPrivate::enableMessageDisplay()
{
    mMsgDisplay = true;
    adjustLayout();
}

void ViewerPrivate::displayMessage()
{
    showHideMimeTree();

    mNodeHelper->setOverrideCodec(mMessage.data(), overrideCodec());

    if (mMessageItem.hasAttribute<MessageViewer::MessageDisplayFormatAttribute>()) {
        const MessageViewer::MessageDisplayFormatAttribute *const attr = mMessageItem.attribute<MessageViewer::MessageDisplayFormatAttribute>();
        setHtmlLoadExtOverride(attr->remoteContent());
        setDisplayFormatMessageOverwrite(attr->messageFormat());
    }

    htmlWriter()->begin(QString());
    htmlWriter()->queue(mCSSHelper->htmlHead(mUseFixedFont));

    if (!mMainWindow) {
        q->setWindowTitle(mMessage->subject()->asUnicodeString());
    }

    // Don't update here, parseMsg() can overwrite the HTML mode, which would lead to flicker.
    // It is updated right after parseMsg() instead.
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    mColorBar->setMode(MimeTreeParser::Util::Normal, HtmlStatusBar::NoUpdate);
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    if (mMessageItem.hasAttribute<ErrorAttribute>()) {
        //TODO: Insert link to clear error so that message might be resent
        const ErrorAttribute *const attr = mMessageItem.attribute<ErrorAttribute>();
        Q_ASSERT(attr);
        const QColor foreground = KColorScheme(QPalette::Active, KColorScheme::View).foreground(KColorScheme::NegativeText).color();
        const QColor background = KColorScheme(QPalette::Active, KColorScheme::View).background(KColorScheme::NegativeBackground).color();

        htmlWriter()->queue(QStringLiteral("<div style=\"background:%1;color:%2;border:1px solid %3\">%4</div>").arg(background.name(), foreground.name(), foreground.name(), attr->message().toHtmlEscaped()));
        htmlWriter()->queue(QStringLiteral("<p></p>"));
    }

    parseContent(mMessage.data());
#ifndef QT_NO_TREEVIEW
    mMimePartTree->setRoot(mNodeHelper->messageWithExtraContent(mMessage.data()));
#endif
    mColorBar->update();

    htmlWriter()->queue(QStringLiteral("</body></html>"));
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#ifdef MESSAGEVIEWER_USE_QTWEBENGINE
    connect(mPartHtmlWriter.data(), &WebEnginePartHtmlWriter::finished, this, &ViewerPrivate::injectAttachments, Qt::UniqueConnection);
    connect(mPartHtmlWriter.data(), &WebEnginePartHtmlWriter::finished, this, &ViewerPrivate::slotMessageRendered, Qt::UniqueConnection);
#else
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    connect(mPartHtmlWriter.data(), &WebKitPartHtmlWriter::finished, this, &ViewerPrivate::injectAttachments, Qt::UniqueConnection);
    connect(mPartHtmlWriter.data(), &WebKitPartHtmlWriter::finished, this, &ViewerPrivate::slotMessageRendered, Qt::UniqueConnection);
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#endif
    connect(mPartHtmlWriter, SIGNAL(finished()), this, SLOT(toggleFullAddressList()), Qt::UniqueConnection);
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    htmlWriter()->flush();
}

void ViewerPrivate::collectionFetchedForStoringDecryptedMessage(KJob *job)
{
    if (job->error()) {
        return;
    }

    Akonadi::Collection col;
    Q_FOREACH (const Akonadi::Collection &c, static_cast<Akonadi::CollectionFetchJob *>(job)->collections()) {
        if (c == mMessageItem.parentCollection()) {
            col = c;
            break;
        }
    }

    if (!col.isValid()) {
        return;
    }
    Akonadi::AgentInstance::List instances = Akonadi::AgentManager::self()->instances();
    const QString itemResource = col.resource();
    Akonadi::AgentInstance resourceInstance;
    foreach (const Akonadi::AgentInstance &instance, instances) {
        if (instance.identifier() == itemResource) {
            resourceInstance = instance;
            break;
        }
    }
    bool isInOutbox = true;
    Akonadi::Collection outboxCollection = Akonadi::SpecialMailCollections::self()->collection(
            Akonadi::SpecialMailCollections::Outbox, resourceInstance);
    if (resourceInstance.isValid() && outboxCollection != col) {
        isInOutbox = false;
    }

    if (!isInOutbox) {
        KMime::Message::Ptr unencryptedMessage = mNodeHelper->unencryptedMessage(mMessage);
        if (unencryptedMessage) {
            mMessageItem.setPayload<KMime::Message::Ptr>(unencryptedMessage);
            Akonadi::ItemModifyJob *job = new Akonadi::ItemModifyJob(mMessageItem);
            connect(job, &KJob::result, this, &ViewerPrivate::itemModifiedResult);
        }
    }
}

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void ViewerPrivate::postProcessMessage(MimeTreeParser::ObjectTreeParser *otp, MimeTreeParser::KMMsgEncryptionState encryptionState)
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{
    if (MessageViewer::MessageViewerSettings::self()->storeDisplayedMessagesUnencrypted()) {

        // Hack to make sure the S/MIME CryptPlugs follows the strict requirement
        // of german government:
        // --> All received encrypted messages *must* be stored in unencrypted form
        //     after they have been decrypted once the user has read them.
        //     ( "Aufhebung der Verschluesselung nach dem Lesen" )
        //
        // note: Since there is no configuration option for this, we do that for
        //       all kinds of encryption now - *not* just for S/MIME.
        //       This could be changed in the objectTreeToDecryptedMsg() function
        //       by deciding when (or when not, resp.) to set the 'dataNode' to
        //       something different than 'curNode'.

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        const bool messageAtLeastPartiallyEncrypted = (MimeTreeParser::KMMsgFullyEncrypted == encryptionState) ||
                (MimeTreeParser::KMMsgPartiallyEncrypted == encryptionState);
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        // only proceed if we were called the normal way - not by
        // double click on the message (==not running in a separate window)
        if (decryptMessage() && // only proceed if the message has actually been decrypted
                !otp->hasPendingAsyncJobs() && // only proceed if no pending async jobs are running:
                messageAtLeastPartiallyEncrypted) {
            //check if the message is in the outbox folder
            //FIXME: using root() is too much, but using mMessageItem.parentCollection() returns no collections in job->collections()
            //FIXME: this is done async, which means it is possible that the user selects another message while
            //       this job is running. In that case, collectionFetchedForStoringDecryptedMessage() will work
            //       on the wrong item!
            Akonadi::CollectionFetchJob *job = new Akonadi::CollectionFetchJob(Akonadi::Collection::root(),
                    Akonadi::CollectionFetchJob::Recursive);
            connect(job, &KJob::result,
                    this, &ViewerPrivate::collectionFetchedForStoringDecryptedMessage);
        }
    }
}

void ViewerPrivate::parseContent(KMime::Content *content)
{
    assert(content != 0);

    // Check if any part of this message is a v-card
    // v-cards can be either text/x-vcard or text/directory, so we need to check
    // both.
    KMime::Content *vCardContent = findContentByType(content, "text/x-vcard");
    if (!vCardContent) {
        vCardContent = findContentByType(content, "text/directory");
    }
    bool hasVCard = false;
    if (vCardContent) {
        // ### FIXME: We should only do this if the vCard belongs to the sender,
        // ### i.e. if the sender's email address is contained in the vCard.
        const QByteArray vCard = vCardContent->decodedContent();
        KContacts::VCardConverter t;
        if (!t.parseVCards(vCard).isEmpty()) {
            hasVCard = true;
            mNodeHelper->writeNodeToTempFile(vCardContent);
        }
    }

    KMime::Message *message = dynamic_cast<KMime::Message *>(content);
    if (message) {
        htmlWriter()->queue(writeMsgHeader(message, hasVCard ? vCardContent : 0, true));
    }

    // Pass control to the OTP now, which does the real work
    mNodeHelper->removeTempFiles();
    mNodeHelper->setNodeUnprocessed(mMessage.data(), true);
    MailViewerSource otpSource(this);
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    MimeTreeParser::ObjectTreeParser otp(&otpSource, mNodeHelper, mMessage.data() != content /* show only single node */);
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    otp.setAllowAsync(!mPrinting);
    otp.setPrinting(mPrinting);
    otp.parseObjectTree(content);

    // TODO: Setting the signature state to nodehelper is not enough, it should actually
    // be added to the store, so that the message list correctly displays the signature state
    // of messages that were parsed at least once
    // store encrypted/signed status information in the KMMessage
    //  - this can only be done *after* calling parseObjectTree()
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    MimeTreeParser::KMMsgEncryptionState encryptionState = mNodeHelper->overallEncryptionState(content);
    MimeTreeParser::KMMsgSignatureState signatureState  = mNodeHelper->overallSignatureState(content);
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    mNodeHelper->setEncryptionState(content, encryptionState);
    // Don't reset the signature state to "not signed" (e.g. if one canceled the
    // decryption of a signed messages which has already been decrypted before).
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    if (signatureState != MimeTreeParser::KMMsgNotSigned ||
            mNodeHelper->signatureState(content) == MimeTreeParser::KMMsgSignatureStateUnknown) {
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        mNodeHelper->setSignatureState(content, signatureState);
    }

    postProcessMessage(&otp, encryptionState);

    showHideMimeTree();
}

QString ViewerPrivate::writeMsgHeader(KMime::Message *aMsg, KMime::Content *vCardNode,
                                      bool topLevel)
{
    if (!headerStylePlugin()) {
        qCCritical(MESSAGEVIEWER_LOG) << "trying to writeMsgHeader() without a header style set!";
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        return {};
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    }
    QString href;
    if (vCardNode) {
        href = mNodeHelper->asHREF(vCardNode, QStringLiteral("body"));
    }
    headerStylePlugin()->headerStyle()->setHeaderStrategy(headerStylePlugin()->headerStrategy());
    headerStylePlugin()->headerStyle()->setVCardName(href);
    headerStylePlugin()->headerStyle()->setPrinting(mPrinting);
    headerStylePlugin()->headerStyle()->setTopLevel(topLevel);
    headerStylePlugin()->headerStyle()->setAllowAsync(true);
    headerStylePlugin()->headerStyle()->setSourceObject(this);
    headerStylePlugin()->headerStyle()->setNodeHelper(mNodeHelper);
    headerStylePlugin()->headerStyle()->setMessagePath(mMessagePath);
    if (mMessageItem.isValid()) {
        Akonadi::MessageStatus status;
        status.setStatusFromFlags(mMessageItem.flags());

        headerStylePlugin()->headerStyle()->setMessageStatus(status);
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        headerStylePlugin()->headerStyle()->setCollectionName(mMessageItem.parentCollection().displayName());
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    } else {
        headerStylePlugin()->headerStyle()->setCollectionName(QString());
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        headerStylePlugin()->headerStyle()->setReadOnlyMessage(true);
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    }

    return headerStylePlugin()->headerStyle()->format(aMsg);
}

void ViewerPrivate::showVCard(KMime::Content *msgPart)
{
    const QByteArray vCard = msgPart->decodedContent();

    VCardViewer *vcv = new VCardViewer(mMainWindow, vCard);
    vcv->setAttribute(Qt::WA_DeleteOnClose);
    vcv->show();
}

void ViewerPrivate::initHtmlWidget()
{
    mViewer->setFocusPolicy(Qt::WheelFocus);
    mViewer->installEventFilter(this);

    if (!htmlWriter()) {
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#ifdef MESSAGEVIEWER_USE_QTWEBENGINE
        mPartHtmlWriter = new WebEnginePartHtmlWriter(mViewer, 0);
#else
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        mPartHtmlWriter = new WebKitPartHtmlWriter(mViewer, 0);
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#endif
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#ifdef MESSAGEVIEWER_READER_HTML_DEBUG
        mHtmlWriter = new TeeHtmlWriter(new FileHtmlWriter(QString()),
                                        mPartHtmlWriter);
#else
        mHtmlWriter = mPartHtmlWriter;
#endif
    }
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#ifdef MESSAGEVIEWER_USE_QTWEBENGINE
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    connect(mViewer->page(), &QWebEnginePage::linkHovered,
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            this, &ViewerPrivate::slotUrlOn);
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    connect(mViewer, &MailWebEngineView::openUrl,
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            this, &ViewerPrivate::slotUrlOpen, Qt::QueuedConnection);
    connect(mViewer, &MailWebEngineView::popupMenu,
            this, &ViewerPrivate::slotUrlPopup);
    connect(mViewer, &MailWebEngineView::messageMayBeAScam, this, &ViewerPrivate::slotMessageMayBeAScam);
    connect(mScamDetectionWarning, &ScamDetectionWarningWidget::showDetails, mViewer, &MailWebEngineView::slotShowDetails);
#else
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    connect(mViewer, &MailWebView::linkHovered,
            this, &ViewerPrivate::slotUrlOn);
    connect(mViewer, &QWebView::linkClicked,
            this, &ViewerPrivate::slotUrlOpen, Qt::QueuedConnection);
    connect(mViewer, &MailWebView::popupMenu,
            this, &ViewerPrivate::slotUrlPopup);
    connect(mViewer, &MailWebView::messageMayBeAScam, this, &ViewerPrivate::slotMessageMayBeAScam);
    connect(mScamDetectionWarning, &ScamDetectionWarningWidget::showDetails, mViewer, &MailWebView::slotShowDetails);
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#endif
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    connect(mScamDetectionWarning, &ScamDetectionWarningWidget::moveMessageToTrash, this, &ViewerPrivate::moveMessageToTrash);
    connect(mScamDetectionWarning, &ScamDetectionWarningWidget::messageIsNotAScam, this, &ViewerPrivate::slotMessageIsNotAScam);
    connect(mScamDetectionWarning, &ScamDetectionWarningWidget::addToWhiteList, this, &ViewerPrivate::slotAddToWhiteList);
}

bool ViewerPrivate::eventFilter(QObject *, QEvent *e)
{
    if (e->type() == QEvent::MouseButtonPress) {
        QMouseEvent *me = static_cast<QMouseEvent *>(e);
        if (me->button() == Qt::LeftButton && (me->modifiers() & Qt::ShiftModifier)) {
            // special processing for shift+click
            URLHandlerManager::instance()->handleShiftClick(mHoveredUrl, this);
            return true;
        }
        if (me->button() == Qt::LeftButton) {
            mCanStartDrag = URLHandlerManager::instance()->willHandleDrag(mHoveredUrl, this);
            mLastClickPosition = me->pos();
        }
    } else if (e->type() ==  QEvent::MouseButtonRelease) {
        mCanStartDrag = false;
    } else if (e->type() == QEvent::MouseMove) {

        QMouseEvent *me = static_cast<QMouseEvent *>(e);

        // First, update the hovered URL
        mHoveredUrl = mViewer->linkOrImageUrlAt(me->globalPos());

        // If we are potentially handling a drag, deal with that.
        if (mCanStartDrag && me->buttons() & Qt::LeftButton) {

            if ((mLastClickPosition - me->pos()).manhattanLength() > QApplication::startDragDistance()) {
                if (URLHandlerManager::instance()->handleDrag(mHoveredUrl, this)) {

                    // If the URL handler manager started a drag, don't handle this in the future
                    mCanStartDrag = false;
                }
            }

            // Don't tell WebKit about this mouse move event, or it might start its own drag!
            return true;
        }
    }
    //Don't tell to Webkit to get zoom > 300 and < 100
    else if (e->type() == QEvent::Wheel) {
        QWheelEvent *me = static_cast<QWheelEvent *>(e);
        if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
            const int numDegrees = me->delta() / 8;
            const int numSteps = numDegrees / 15;
            const qreal factor = mZoomActionMenu->zoomFactor() + numSteps * 10;
            if (factor >= 10 && factor <= 300) {
                mZoomActionMenu->setZoomFactor(factor);
                mZoomActionMenu->setWebViewerZoomFactor(factor / 100.0);
            }
            return true;
        }
    }

    // standard event processing
    return false;
}

void ViewerPrivate::readConfig()
{
    delete mCSSHelper;
    mCSSHelper = new CSSHelper(mViewer);

    mUseFixedFont = MessageViewer::MessageViewerSettings::self()->useFixedFont();
    if (mToggleFixFontAction) {
        mToggleFixFontAction->setChecked(mUseFixedFont);
    }

    mHtmlMailGlobalSetting = MessageViewer::MessageViewerSettings::self()->htmlMail();
    mHtmlLoadExternalGlobalSetting = MessageViewer::MessageViewerSettings::self()->htmlLoadExternal();

    if (mZoomActionMenu) {
        mZoomActionMenu->setZoomTextOnly(MessageViewer::MessageViewerSettings::self()->zoomTextOnly());
    }
    readGravatarConfig();
    if (mHeaderStyleMenuManager) {
        mHeaderStyleMenuManager->readConfig();
    }

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    setAttachmentStrategy(MimeTreeParser::AttachmentStrategy::create(MessageViewer::MessageViewerSettings::self()->attachmentStrategy()));
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    KToggleAction *raction = actionForAttachmentStrategy(attachmentStrategy());
    if (raction) {
        raction->setChecked(true);
    }

    adjustLayout();

    readGlobalOverrideCodec();
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#ifdef MESSAGEVIEWER_USE_QTWEBENGINE
    mViewer->settings()->setFontSize(QWebEngineSettings::MinimumFontSize, MessageViewer::MessageViewerSettings::self()->minimumFontSize());
    mViewer->settings()->setFontSize(QWebEngineSettings::MinimumLogicalFontSize, MessageViewer::MessageViewerSettings::self()->minimumFontSize());
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    //TODO verify Qt5.7
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    //FIXME mViewer->settings()->setAttribute(QWebEngineSettings::PrintElementBackgrounds, MessageViewer::MessageViewerSettings::self()->printBackgroundColorImages());
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#else
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    mViewer->settings()->setFontSize(QWebSettings::MinimumFontSize, MessageViewer::MessageViewerSettings::self()->minimumFontSize());
    mViewer->settings()->setFontSize(QWebSettings::MinimumLogicalFontSize, MessageViewer::MessageViewerSettings::self()->minimumFontSize());
    mViewer->settings()->setAttribute(QWebSettings::PrintElementBackgrounds, MessageViewer::MessageViewerSettings::self()->printBackgroundColorImages());
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#endif
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    if (mMessage) {
        update();
    }
    mColorBar->update();
}

void ViewerPrivate::readGravatarConfig()
{
    Gravatar::GravatarCache::self()->setMaximumSize(Gravatar::GravatarSettings::self()->gravatarCacheSize());
    if (!Gravatar::GravatarSettings::self()->gravatarSupportEnabled()) {
        Gravatar::GravatarCache::self()->clear();
    }
}

void ViewerPrivate::slotGeneralFontChanged()
{
    delete mCSSHelper;
    mCSSHelper = new CSSHelper(mViewer);
    if (mMessage) {
        update();
    }
}

void ViewerPrivate::writeConfig(bool sync)
{
    MessageViewer::MessageViewerSettings::self()->setUseFixedFont(mUseFixedFont);
    if (attachmentStrategy()) {
        MessageViewer::MessageViewerSettings::self()->setAttachmentStrategy(QLatin1String(attachmentStrategy()->name()));
    }
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    if (mZoomActionMenu) {
        MessageViewer::MessageViewerSettings::self()->setZoomTextOnly(mZoomActionMenu->zoomTextOnly());
    }
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    saveSplitterSizes();
    if (sync) {
        Q_EMIT requestConfigSync();
    }
}

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const MimeTreeParser::AttachmentStrategy *ViewerPrivate::attachmentStrategy() const
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{
    return mAttachmentStrategy;
}

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void ViewerPrivate::setAttachmentStrategy(const MimeTreeParser::AttachmentStrategy *strategy)
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{
    if (mAttachmentStrategy == strategy) {
        return;
    }
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    mAttachmentStrategy = strategy ? strategy : MimeTreeParser::AttachmentStrategy::smart();
    update(MimeTreeParser::Force);
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}

QString ViewerPrivate::overrideEncoding() const
{
    return mOverrideEncoding;
}

void ViewerPrivate::setOverrideEncoding(const QString &encoding)
{
    if (encoding == mOverrideEncoding) {
        return;
    }

    mOverrideEncoding = encoding;
    if (mSelectEncodingAction) {
        if (encoding.isEmpty()) {
            mSelectEncodingAction->setCurrentItem(0);
        } else {
            const QStringList encodings = mSelectEncodingAction->items();
            int i = 0;
            for (QStringList::const_iterator it = encodings.constBegin(), end = encodings.constEnd(); it != end; ++it, ++i) {
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                if (MimeTreeParser::NodeHelper::encodingForName(*it) == encoding) {
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                    mSelectEncodingAction->setCurrentItem(i);
                    break;
                }
            }
            if (i == encodings.size()) {
                // the value of encoding is unknown => use Auto
                qCWarning(MESSAGEVIEWER_LOG) << "Unknown override character encoding" << encoding
                                             << ". Using Auto instead.";
                mSelectEncodingAction->setCurrentItem(0);
                mOverrideEncoding.clear();
            }
        }
    }
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    update(MimeTreeParser::Force);
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}

void ViewerPrivate::setPrinting(bool enable)
{
    mPrinting = enable;
}

void ViewerPrivate::printMessage(const Akonadi::Item &message)
{
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#ifdef MESSAGEVIEWER_USE_QTWEBENGINE
    disconnect(mPartHtmlWriter.data(), &WebEnginePartHtmlWriter::finished, this, &ViewerPrivate::slotPrintMsg);
    connect(mPartHtmlWriter.data(), &WebEnginePartHtmlWriter::finished, this, &ViewerPrivate::slotPrintMsg);
#else
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    disconnect(mPartHtmlWriter.data(), &WebKitPartHtmlWriter::finished, this, &ViewerPrivate::slotPrintMsg);
    connect(mPartHtmlWriter.data(), &WebKitPartHtmlWriter::finished, this, &ViewerPrivate::slotPrintMsg);
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    setMessageItem(message, MimeTreeParser::Force);
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}

void ViewerPrivate::printPreviewMessage(const Akonadi::Item &message)
{
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#ifdef MESSAGEVIEWER_USE_QTWEBENGINE
    disconnect(mPartHtmlWriter.data(), &WebEnginePartHtmlWriter::finished, this, &ViewerPrivate::slotPrintPreview);
    connect(mPartHtmlWriter.data(), &WebEnginePartHtmlWriter::finished, this, &ViewerPrivate::slotPrintPreview);
#else
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    disconnect(mPartHtmlWriter.data(), &WebKitPartHtmlWriter::finished, this, &ViewerPrivate::slotPrintPreview);
    connect(mPartHtmlWriter.data(), &WebKitPartHtmlWriter::finished, this, &ViewerPrivate::slotPrintPreview);
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    setMessageItem(message, MimeTreeParser::Force);
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}

void ViewerPrivate::resetStateForNewMessage()
{
    mClickedUrl.clear();
    mImageUrl.clear();
    enableMessageDisplay(); // just to make sure it's on
    mMessage.reset();
    mNodeHelper->clear();
    mMessagePartNode = 0;
#ifndef QT_NO_TREEVIEW
    mMimePartTree->clearModel();
#endif
    mSavedRelativePosition = 0;
    setShowSignatureDetails(false);
    mFindBar->closeBar();
    mViewerPluginToolManager->closeAllTools();
    mScamDetectionWarning->setVisible(false);
    mOpenAttachmentFolderWidget->setVisible(false);

    if (mPrinting) {
        if (MessageViewer::MessageViewerSettings::self()->respectExpandCollapseSettings()) {
            if (MessageViewer::MessageViewerSettings::self()->showExpandQuotesMark()) {
                mLevelQuote = MessageViewer::MessageViewerSettings::self()->collapseQuoteLevelSpin() - 1;
            } else {
                mLevelQuote = -1;
            }
        } else {
            mLevelQuote = -1;
        }
    }
}

void ViewerPrivate::setMessageInternal(const KMime::Message::Ptr &message,
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                                       MimeTreeParser::UpdateMode updateMode)
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{
    mViewerPluginToolManager->updateActions(mMessageItem);
    mMessage = message;
    if (message) {
        mNodeHelper->setOverrideCodec(mMessage.data(), overrideCodec());
    }

#ifndef QT_NO_TREEVIEW
    mMimePartTree->setRoot(mNodeHelper->messageWithExtraContent(message.data()));
    update(updateMode);
#endif

}

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void ViewerPrivate::setMessageItem(const Akonadi::Item &item, MimeTreeParser::UpdateMode updateMode)
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{
    resetStateForNewMessage();
    foreach (const Akonadi::Item::Id monitoredId, mMonitor.itemsMonitoredEx()) {
        mMonitor.setItemMonitored(Akonadi::Item(monitoredId), false);
    }
    Q_ASSERT(mMonitor.itemsMonitoredEx().isEmpty());

    mMessageItem = item;
    if (mMessageItem.isValid()) {
        mMonitor.setItemMonitored(mMessageItem, true);
    }

    if (!mMessageItem.hasPayload<KMime::Message::Ptr>()) {
        if (mMessageItem.isValid()) {
            qCWarning(MESSAGEVIEWER_LOG) << "Payload is not a MessagePtr!";
        }
        return;
    }

    setMessageInternal(mMessageItem.payload<KMime::Message::Ptr>(), updateMode);
}

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void ViewerPrivate::setMessage(const KMime::Message::Ptr &aMsg, MimeTreeParser::UpdateMode updateMode)
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{
    resetStateForNewMessage();

    Akonadi::Item item;
    item.setMimeType(KMime::Message::mimeType());
    item.setPayload(aMsg);
    mMessageItem = item;

    setMessageInternal(aMsg, updateMode);
}

void ViewerPrivate::setMessagePart(KMime::Content *node)
{
    // Cancel scheduled updates of the reader window, as that would stop the
    // timer of the HTML writer, which would make viewing attachment not work
    // anymore as not all HTML is written to the HTML part.
    // We're updating the reader window here ourselves anyway.
    mUpdateReaderWinTimer.stop();

    if (node) {
        mMessagePartNode = node;
        if (node->bodyIsMessage()) {
            mMainWindow->setWindowTitle(node->bodyAsMessage()->subject()->asUnicodeString());
        } else {
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            QString windowTitle = MimeTreeParser::NodeHelper::fileName(node);
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            if (windowTitle.isEmpty()) {
                windowTitle = node->contentDescription()->asUnicodeString();
            }
            if (!windowTitle.isEmpty()) {
                mMainWindow->setWindowTitle(i18n("View Attachment: %1", windowTitle));
            }
        }

        htmlWriter()->begin(QString());
        htmlWriter()->queue(mCSSHelper->htmlHead(mUseFixedFont));

        parseContent(node);

        htmlWriter()->queue(QStringLiteral("</body></html>"));
        htmlWriter()->flush();
    }
}

void ViewerPrivate::showHideMimeTree()
{
#ifndef QT_NO_TREEVIEW
    if (mimePartTreeIsEmpty()) {
        mMimePartTree->hide();
        return;
    }
    bool showMimeTree = false;
    if (MessageViewer::MessageViewerSettings::self()->mimeTreeMode() == MessageViewer::MessageViewerSettings::EnumMimeTreeMode::Always) {
        mMimePartTree->show();
        showMimeTree = true;
    } else {
        // don't rely on QSplitter maintaining sizes for hidden widgets:
        saveSplitterSizes();
        mMimePartTree->hide();
        showMimeTree = false;
    }
    if (mToggleMimePartTreeAction && (mToggleMimePartTreeAction->isChecked() != showMimeTree)) {
        mToggleMimePartTreeAction->setChecked(showMimeTree);
    }
#endif
}

void ViewerPrivate::atmViewMsg(const KMime::Message::Ptr &message)
{
    Q_ASSERT(message);
    Q_EMIT showMessage(message, overrideEncoding());
}

void ViewerPrivate::adjustLayout()
{
#ifndef QT_NO_TREEVIEW
    const int mimeH = MessageViewer::MessageViewerSettings::self()->mimePaneHeight();
    const int messageH = MessageViewer::MessageViewerSettings::self()->messagePaneHeight();
    QList<int> splitterSizes;
    splitterSizes << messageH << mimeH;

    mSplitter->addWidget(mMimePartTree);
    mSplitter->setSizes(splitterSizes);

    if (MessageViewer::MessageViewerSettings::self()->mimeTreeMode() == MessageViewer::MessageViewerSettings::EnumMimeTreeMode::Always &&
            mMsgDisplay) {
        mMimePartTree->show();
    } else {
        mMimePartTree->hide();
    }
#endif

    if (MessageViewer::MessageViewerSettings::self()->showColorBar() && mMsgDisplay) {
        mColorBar->show();
    } else {
        mColorBar->hide();
    }
}

void ViewerPrivate::saveSplitterSizes() const
{
#ifndef QT_NO_TREEVIEW
    if (!mSplitter || !mMimePartTree) {
        return;
    }
    if (mMimePartTree->isHidden()) {
        return;    // don't rely on QSplitter maintaining sizes for hidden widgets.
    }
    MessageViewer::MessageViewerSettings::self()->setMimePaneHeight(mSplitter->sizes().at(1));
    MessageViewer::MessageViewerSettings::self()->setMessagePaneHeight(mSplitter->sizes().at(0));
#endif
}

void ViewerPrivate::createWidgets()
{
    //TODO: Make a MDN bar similar to Mozillas password bar and show MDNs here as soon as a
    //      MDN enabled message is shown.
    QVBoxLayout *vlay = new QVBoxLayout(q);
    vlay->setMargin(0);
    mSplitter = new QSplitter(Qt::Vertical, q);
    connect(mSplitter, &QSplitter::splitterMoved, this, &ViewerPrivate::saveSplitterSizes);
    mSplitter->setObjectName(QStringLiteral("mSplitter"));
    mSplitter->setChildrenCollapsible(false);
    vlay->addWidget(mSplitter);
#ifndef QT_NO_TREEVIEW
    mMimePartTree = new MimePartTreeView(mSplitter);
    connect(mMimePartTree, &QAbstractItemView::activated, this, &ViewerPrivate::slotMimePartSelected);
    connect(mMimePartTree, &QWidget::customContextMenuRequested, this, &ViewerPrivate::slotMimeTreeContextMenuRequested);
#endif

    mBox = new QWidget(mSplitter);
    QHBoxLayout *mBoxHBoxLayout = new QHBoxLayout(mBox);
    mBoxHBoxLayout->setMargin(0);

    mColorBar = new HtmlStatusBar(mBox);
    mBoxHBoxLayout->addWidget(mColorBar);
    QWidget *readerBox = new QWidget(mBox);
    QVBoxLayout *readerBoxVBoxLayout = new QVBoxLayout(readerBox);
    readerBoxVBoxLayout->setMargin(0);
    mBoxHBoxLayout->addWidget(readerBox);

    mColorBar->setObjectName(QStringLiteral("mColorBar"));
    mColorBar->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);

    mScamDetectionWarning = new ScamDetectionWarningWidget(readerBox);
    mScamDetectionWarning->setObjectName(QStringLiteral("scandetectionwarning"));
    readerBoxVBoxLayout->addWidget(mScamDetectionWarning);

    mOpenAttachmentFolderWidget = new OpenAttachmentFolderWidget(readerBox);
    mOpenAttachmentFolderWidget->setObjectName(QStringLiteral("openattachementfolderwidget"));
    readerBoxVBoxLayout->addWidget(mOpenAttachmentFolderWidget);

    mTextToSpeechWidget = new KPIMTextEdit::TextToSpeechWidget(readerBox);
    mTextToSpeechWidget->setObjectName(QStringLiteral("texttospeechwidget"));
    readerBoxVBoxLayout->addWidget(mTextToSpeechWidget);

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#ifdef MESSAGEVIEWER_USE_QTWEBENGINE
    mViewer = new MailWebEngineView(mActionCollection, readerBox);
#else
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    mViewer = new MailWebView(mActionCollection, readerBox);
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#endif
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    readerBoxVBoxLayout->addWidget(mViewer);
    mViewer->setObjectName(QStringLiteral("mViewer"));

    mViewerPluginToolManager = new MessageViewer::ViewerPluginToolManager(readerBox, this);
    mViewerPluginToolManager->setActionCollection(mActionCollection);
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    mViewerPluginToolManager->setPluginName(QStringLiteral("messageviewer"));
    mViewerPluginToolManager->setServiceTypeName(QStringLiteral("MessageViewer/ViewerPlugin"));
    if (!mViewerPluginToolManager->initializePluginList()) {
        qCDebug(MESSAGEVIEWER_LOG) << " Impossible to initialize plugins";
    }
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    mViewerPluginToolManager->createView();
    connect(mViewerPluginToolManager, &MessageViewer::ViewerPluginToolManager::activatePlugin, this, &ViewerPrivate::slotActivatePlugin);

    mSliderContainer = new KPIMTextEdit::SlideContainer(readerBox);
    mSliderContainer->setObjectName(QStringLiteral("slidercontainer"));
    readerBoxVBoxLayout->addWidget(mSliderContainer);
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#ifdef MESSAGEVIEWER_USE_QTWEBENGINE
    mFindBar = new FindBarWebEngineView(mViewer, q);
#else
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    mFindBar = new FindBarWebView(mViewer, q);
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#endif
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    connect(mFindBar, &FindBarBase::hideFindBar, mSliderContainer, &KPIMTextEdit::SlideContainer::slideOut);
    mSliderContainer->setContent(mFindBar);

#ifndef QT_NO_TREEVIEW
    mSplitter->setStretchFactor(mSplitter->indexOf(mMimePartTree), 0);
#endif
}

void ViewerPrivate::slotStyleChanged(MessageViewer::HeaderStylePlugin *plugin)
{
    mHeaderStylePlugin = plugin;
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    update(MimeTreeParser::Force);
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}

void ViewerPrivate::slotStyleUpdated()
{
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    update(MimeTreeParser::Force);
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}

void ViewerPrivate::createActions()
{
    KActionCollection *ac = mActionCollection;
    mHeaderStyleMenuManager = new MessageViewer::HeaderStyleMenuManager(ac, this);
    connect(mHeaderStyleMenuManager, &MessageViewer::HeaderStyleMenuManager::styleChanged, this, &ViewerPrivate::slotStyleChanged);
    connect(mHeaderStyleMenuManager, &MessageViewer::HeaderStyleMenuManager::styleUpdated, this, &ViewerPrivate::slotStyleUpdated);
    if (!ac) {
        return;
    }
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    mZoomActionMenu = new MessageViewer::ZoomActionMenu(this);
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#ifdef MESSAGEVIEWER_USE_QTWEBENGINE
    connect(mZoomActionMenu, &ZoomActionMenu::zoomChanged, mViewer, &MailWebEngineView::slotZoomChanged);
#else
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    connect(mZoomActionMenu, &ZoomActionMenu::zoomChanged, mViewer, &MailWebView::slotZoomChanged);
    connect(mZoomActionMenu, &ZoomActionMenu::zoomTextOnlyChanged, mViewer, &MailWebView::slotZoomTextOnlyChanged);
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#endif
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    mZoomActionMenu->setActionCollection(ac);
    mZoomActionMenu->createZoomActions();

    // attachment style
    KActionMenu *attachmentMenu  = new KActionMenu(i18nc("View->", "&Attachments"), this);
    ac->addAction(QStringLiteral("view_attachments"), attachmentMenu);
    addHelpTextAction(attachmentMenu, i18n("Choose display style of attachments"));

    QActionGroup *group = new QActionGroup(this);
    KToggleAction *raction  = new KToggleAction(i18nc("View->attachments->", "&As Icons"), this);
    ac->addAction(QStringLiteral("view_attachments_as_icons"), raction);
    connect(raction, &QAction::triggered, this, &ViewerPrivate::slotIconicAttachments);
    addHelpTextAction(raction, i18n("Show all attachments as icons. Click to see them."));
    group->addAction(raction);
    attachmentMenu->addAction(raction);

    raction  = new KToggleAction(i18nc("View->attachments->", "&Smart"), this);
    ac->addAction(QStringLiteral("view_attachments_smart"), raction);
    connect(raction, &QAction::triggered, this, &ViewerPrivate::slotSmartAttachments);
    addHelpTextAction(raction, i18n("Show attachments as suggested by sender."));
    group->addAction(raction);
    attachmentMenu->addAction(raction);

    raction  = new KToggleAction(i18nc("View->attachments->", "&Inline"), this);
    ac->addAction(QStringLiteral("view_attachments_inline"), raction);
    connect(raction, &QAction::triggered, this, &ViewerPrivate::slotInlineAttachments);
    addHelpTextAction(raction, i18n("Show all attachments inline (if possible)"));
    group->addAction(raction);
    attachmentMenu->addAction(raction);

    raction  = new KToggleAction(i18nc("View->attachments->", "&Hide"), this);
    ac->addAction(QStringLiteral("view_attachments_hide"), raction);
    connect(raction, &QAction::triggered, this, &ViewerPrivate::slotHideAttachments);
    addHelpTextAction(raction, i18n("Do not show attachments in the message viewer"));
    group->addAction(raction);
    attachmentMenu->addAction(raction);

    mHeaderOnlyAttachmentsAction = new KToggleAction(i18nc("View->attachments->", "In Header Only"), this);
    ac->addAction(QStringLiteral("view_attachments_headeronly"), mHeaderOnlyAttachmentsAction);
    connect(mHeaderOnlyAttachmentsAction, &QAction::triggered,
            this, &ViewerPrivate::slotHeaderOnlyAttachments);
    addHelpTextAction(mHeaderOnlyAttachmentsAction, i18n("Show Attachments only in the header of the mail"));
    group->addAction(mHeaderOnlyAttachmentsAction);
    attachmentMenu->addAction(mHeaderOnlyAttachmentsAction);

    // Set Encoding submenu
    mSelectEncodingAction  = new KSelectAction(QIcon::fromTheme(QStringLiteral("character-set")), i18n("&Set Encoding"), this);
    mSelectEncodingAction->setToolBarMode(KSelectAction::MenuMode);
    ac->addAction(QStringLiteral("encoding"), mSelectEncodingAction);
    connect(mSelectEncodingAction, SIGNAL(triggered(int)),
            SLOT(slotSetEncoding()));
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    QStringList encodings = MimeTreeParser::NodeHelper::supportedEncodings(false);
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    encodings.prepend(i18n("Auto"));
    mSelectEncodingAction->setItems(encodings);
    mSelectEncodingAction->setCurrentItem(0);

    //
    // Message Menu
    //

    // copy selected text to clipboard
    mCopyAction = ac->addAction(KStandardAction::Copy, QStringLiteral("kmail_copy"), this,
                                SLOT(slotCopySelectedText()));
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#ifdef MESSAGEVIEWER_USE_QTWEBENGINE
    connect(mViewer, &MailWebEngineView::selectionChanged,
            this, &ViewerPrivate::viewerSelectionChanged);
#else
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    connect(mViewer, &QWebView::selectionChanged,
            this, &ViewerPrivate::viewerSelectionChanged);
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#endif
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    viewerSelectionChanged();

    // copy all text to clipboard
    mSelectAllAction  = new QAction(i18n("Select All Text"), this);
    ac->addAction(QStringLiteral("mark_all_text"), mSelectAllAction);
    connect(mSelectAllAction, &QAction::triggered, this, &ViewerPrivate::selectAll);
    ac->setDefaultShortcut(mSelectAllAction, QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_A));

    // copy Email address to clipboard
    mCopyURLAction = new QAction(QIcon::fromTheme(QStringLiteral("edit-copy")),
                                 i18n("Copy Link Address"), this);
    ac->addAction(QStringLiteral("copy_url"), mCopyURLAction);
    connect(mCopyURLAction, &QAction::triggered, this, &ViewerPrivate::slotUrlCopy);

    // open URL
    mUrlOpenAction = new QAction(QIcon::fromTheme(QStringLiteral("document-open")), i18n("Open URL"), this);
    ac->addAction(QStringLiteral("open_url"), mUrlOpenAction);
    connect(mUrlOpenAction, SIGNAL(triggered(bool)), this, SLOT(slotUrlOpen()));

    // use fixed font
    mToggleFixFontAction = new KToggleAction(i18n("Use Fi&xed Font"), this);
    ac->addAction(QStringLiteral("toggle_fixedfont"), mToggleFixFontAction);
    connect(mToggleFixFontAction, &QAction::triggered, this, &ViewerPrivate::slotToggleFixedFont);
    ac->setDefaultShortcut(mToggleFixFontAction, QKeySequence(Qt::Key_X));

    // Show message structure viewer
    mToggleMimePartTreeAction = new KToggleAction(i18n("Show Message Structure"), this);
    ac->addAction(QStringLiteral("toggle_mimeparttree"), mToggleMimePartTreeAction);
    connect(mToggleMimePartTreeAction, &QAction::toggled,
            this, &ViewerPrivate::slotToggleMimePartTree);

    mViewSourceAction  = new QAction(i18n("&View Source"), this);
    ac->addAction(QStringLiteral("view_source"), mViewSourceAction);
    connect(mViewSourceAction, &QAction::triggered, this, &ViewerPrivate::slotShowMessageSource);
    ac->setDefaultShortcut(mViewSourceAction, QKeySequence(Qt::Key_V));

    mSaveMessageAction = new QAction(QIcon::fromTheme(QStringLiteral("document-save-as")), i18n("&Save message..."), this);
    ac->addAction(QStringLiteral("save_message"), mSaveMessageAction);
    connect(mSaveMessageAction, &QAction::triggered, this, &ViewerPrivate::slotSaveMessage);
    //Laurent: conflict with kmail shortcut
    //mSaveMessageAction->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_S));

    mSaveMessageDisplayFormat = new QAction(i18n("&Save Display Format"), this);
    ac->addAction(QStringLiteral("save_message_display_format"), mSaveMessageDisplayFormat);
    connect(mSaveMessageDisplayFormat, &QAction::triggered, this, &ViewerPrivate::slotSaveMessageDisplayFormat);

    mResetMessageDisplayFormat = new QAction(i18n("&Reset Display Format"), this);
    ac->addAction(QStringLiteral("reset_message_display_format"), mResetMessageDisplayFormat);
    connect(mResetMessageDisplayFormat, &QAction::triggered, this, &ViewerPrivate::slotResetMessageDisplayFormat);

    //
    // Scroll actions
    //
    mScrollUpAction = new QAction(i18n("Scroll Message Up"), this);
    ac->setDefaultShortcut(mScrollUpAction, QKeySequence(Qt::Key_Up));
    ac->addAction(QStringLiteral("scroll_up"), mScrollUpAction);
    connect(mScrollUpAction, &QAction::triggered,
            q, &Viewer::slotScrollUp);

    mScrollDownAction = new QAction(i18n("Scroll Message Down"), this);
    ac->setDefaultShortcut(mScrollDownAction, QKeySequence(Qt::Key_Down));
    ac->addAction(QStringLiteral("scroll_down"), mScrollDownAction);
    connect(mScrollDownAction, &QAction::triggered,
            q, &Viewer::slotScrollDown);

    mScrollUpMoreAction = new QAction(i18n("Scroll Message Up (More)"), this);
    ac->setDefaultShortcut(mScrollUpMoreAction, QKeySequence(Qt::Key_PageUp));
    ac->addAction(QStringLiteral("scroll_up_more"), mScrollUpMoreAction);
    connect(mScrollUpMoreAction, &QAction::triggered,
            q, &Viewer::slotScrollPrior);

    mScrollDownMoreAction = new QAction(i18n("Scroll Message Down (More)"), this);
    ac->setDefaultShortcut(mScrollDownMoreAction, QKeySequence(Qt::Key_PageDown));
    ac->addAction(QStringLiteral("scroll_down_more"), mScrollDownMoreAction);
    connect(mScrollDownMoreAction, &QAction::triggered,
            q, &Viewer::slotScrollNext);

    //
    // Actions not in menu
    //

    // Toggle HTML display mode.
    mToggleDisplayModeAction = new KToggleAction(i18n("Toggle HTML Display Mode"), this);
    ac->addAction(QStringLiteral("toggle_html_display_mode"), mToggleDisplayModeAction);
    ac->setDefaultShortcut(mToggleDisplayModeAction, QKeySequence(Qt::SHIFT + Qt::Key_H));
    connect(mToggleDisplayModeAction, &QAction::triggered,
            this, &ViewerPrivate::slotToggleHtmlMode);
    addHelpTextAction(mToggleDisplayModeAction, i18n("Toggle display mode between HTML and plain text"));

    // Load external reference
    QAction *loadExternalReferenceAction = new QAction(i18n("Load external references"), this);
    ac->addAction(QStringLiteral("load_external_reference"), loadExternalReferenceAction);
    ac->setDefaultShortcut(loadExternalReferenceAction, QKeySequence(Qt::SHIFT + Qt::CTRL + Qt::Key_R));
    connect(loadExternalReferenceAction, &QAction::triggered,
            this, &ViewerPrivate::slotLoadExternalReference);
    addHelpTextAction(loadExternalReferenceAction, i18n("Load external references from the Internet for this message."));

    mSpeakTextAction = new QAction(i18n("Speak Text"), this);
    mSpeakTextAction->setIcon(QIcon::fromTheme(QStringLiteral("preferences-desktop-text-to-speech")));
    ac->addAction(QStringLiteral("speak_text"), mSpeakTextAction);
    connect(mSpeakTextAction, &QAction::triggered,
            this, &ViewerPrivate::slotSpeakText);

    mCopyImageLocation = new QAction(i18n("Copy Image Location"), this);
    mCopyImageLocation->setIcon(QIcon::fromTheme(QStringLiteral("view-media-visualization")));
    ac->addAction(QStringLiteral("copy_image_location"), mCopyImageLocation);
    ac->setShortcutsConfigurable(mCopyImageLocation, false);
    connect(mCopyImageLocation, &QAction::triggered,
            this, &ViewerPrivate::slotCopyImageLocation);

    mFindInMessageAction = new QAction(QIcon::fromTheme(QStringLiteral("edit-find")), i18n("&Find in Message..."), this);
    ac->addAction(QStringLiteral("find_in_messages"), mFindInMessageAction);
    connect(mFindInMessageAction, &QAction::triggered, this, &ViewerPrivate::slotFind);
    ac->setDefaultShortcut(mFindInMessageAction, KStandardShortcut::find().first());

    mBlockImage = new QAction(i18n("Block image"), this);
    ac->addAction(QStringLiteral("adblock_image"), mBlockImage);
    ac->setShortcutsConfigurable(mBlockImage, false);
    connect(mBlockImage, &QAction::triggered, this, &ViewerPrivate::slotBlockImage);

    mBlockableItems = new QAction(i18n("Open Blockable Items..."), this);
    ac->addAction(QStringLiteral("adblock_blockable_items"), mBlockableItems);
    connect(mBlockableItems, &QAction::triggered, this, &ViewerPrivate::slotOpenBlockableItems);

    mShareServiceUrlMenu = mShareServiceManager->menu();
    ac->addAction(QStringLiteral("shareservice_menu"), mShareServiceUrlMenu);
    connect(mShareServiceManager, &PimCommon::ShareServiceUrlManager::serviceUrlSelected, this, &ViewerPrivate::slotServiceUrlSelected);
}

void ViewerPrivate::showContextMenu(KMime::Content *content, const QPoint &pos)
{
#ifndef QT_NO_TREEVIEW
    if (!content) {
        return;
    }

    if (content->contentType(false)) {
        if (content->contentType()->mimeType() == "text/x-moz-deleted") {
            return;
        }
    }
    const bool isAttachment = !content->contentType()->isMultipart() && !content->isTopLevel();
    const bool isRoot = (content == mMessage.data());
    const auto hasAttachments = KMime::hasAttachment(mMessage.data());

    QMenu popup;

    if (!isRoot) {
        popup.addAction(QIcon::fromTheme(QStringLiteral("document-save-as")), i18n("Save &As..."),
                        this, SLOT(slotAttachmentSaveAs()));

        if (isAttachment) {
            popup.addAction(QIcon::fromTheme(QStringLiteral("document-open")), i18nc("to open", "Open"),
                            this, SLOT(slotAttachmentOpen()));

            if (selectedContents().count() == 1) {
                createOpenWithMenu(&popup, QLatin1String(content->contentType()->mimeType()), false);
            } else {
                popup.addAction(i18n("Open With..."), this, SLOT(slotAttachmentOpenWith()));
            }
            popup.addAction(i18nc("to view something", "View"), this, SLOT(slotAttachmentView()));
        }
    }

    if (hasAttachments) {
        popup.addAction(i18n("Save All Attachments..."), this,
                        SLOT(slotAttachmentSaveAll()));
    }

    // edit + delete only for attachments
    if (!isRoot) {
        if (isAttachment) {
            popup.addAction(QIcon::fromTheme(QStringLiteral("edit-copy")), i18n("Copy"),
                            this, SLOT(slotAttachmentCopy()));
#if 0  //FIXME Laurent Comment for the moment it crash see Bug 287177
            popup.addAction(QIcon::fromTheme("edit-delete"), i18n("Delete Attachment"),
                            this, SLOT(slotAttachmentDelete()));
#endif
            if (MessageViewer::MessageViewerSettings::self()->allowAttachmentEditing())
                popup.addAction(QIcon::fromTheme(QStringLiteral("document-properties")), i18n("Edit Attachment"),
                                this, SLOT(slotAttachmentEdit()));
        }

        if (!content->isTopLevel()) {
            popup.addAction(i18n("Properties"), this, SLOT(slotAttachmentProperties()));
        }
    }
    popup.exec(mMimePartTree->viewport()->mapToGlobal(pos));
#endif

}

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KToggleAction *ViewerPrivate::actionForAttachmentStrategy(const MimeTreeParser::AttachmentStrategy *as)
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{
    if (!mActionCollection) {
        return 0;
    }
    QString actionName;
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    if (as == MimeTreeParser::AttachmentStrategy::iconic()) {
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        actionName = QStringLiteral("view_attachments_as_icons");
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    } else if (as == MimeTreeParser::AttachmentStrategy::smart()) {
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        actionName = QStringLiteral("view_attachments_smart");
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    } else if (as == MimeTreeParser::AttachmentStrategy::inlined()) {
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        actionName = QStringLiteral("view_attachments_inline");
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    } else if (as == MimeTreeParser::AttachmentStrategy::hidden()) {
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        actionName = QStringLiteral("view_attachments_hide");
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    } else if (as == MimeTreeParser::AttachmentStrategy::headerOnly()) {
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        actionName = QStringLiteral("view_attachments_headeronly");
    }

    if (actionName.isEmpty()) {
        return 0;
    } else {
        return static_cast<KToggleAction *>(mActionCollection->action(actionName));
    }
}

void ViewerPrivate::readGlobalOverrideCodec()
{
    // if the global character encoding wasn't changed then there's nothing to do
    if (MessageCore::MessageCoreSettings::self()->overrideCharacterEncoding() == mOldGlobalOverrideEncoding) {
        return;
    }

    setOverrideEncoding(MessageCore::MessageCoreSettings::self()->overrideCharacterEncoding());
    mOldGlobalOverrideEncoding = MessageCore::MessageCoreSettings::self()->overrideCharacterEncoding();
}

const QTextCodec *ViewerPrivate::overrideCodec() const
{
    if (mOverrideEncoding.isEmpty() || mOverrideEncoding == QLatin1String("Auto")) { // Auto
        return 0;
    } else {
        return ViewerPrivate::codecForName(mOverrideEncoding.toLatin1());
    }
}

static QColor nextColor(const QColor &c)
{
    int h, s, v;
    c.getHsv(&h, &s, &v);
    return QColor::fromHsv((h + 50) % 360, qMax(s, 64), v);
}

QString ViewerPrivate::renderAttachments(KMime::Content *node, const QColor &bgColor) const
{

    if (!node) {
        return QString();
    }

    QString html;
    KMime::Content *child = MessageCore::NodeHelper::firstChild(node);

    if (child) {
        QString subHtml = renderAttachments(child, nextColor(bgColor));
        if (!subHtml.isEmpty()) {

            QString visibility;
            if (!mShowAttachmentQuicklist) {
                visibility.append(QLatin1String("display:none;"));
            }

            QString margin;
            if (node != mMessage.data() || headerStylePlugin()->hasMargin()) {
                margin = QStringLiteral("padding:2px; margin:2px; ");
            }
            QString align = headerStylePlugin()->alignment();
            const bool result = (node->contentType()->mediaType().toLower() == "message" || node->contentType()->mediaType().toLower() == "multipart" || node == mMessage.data());
            if (result)
                html += QStringLiteral("<div style=\"background:%1; %2"
                                       "vertical-align:middle; float:%3; %4\">").arg(bgColor.name()).arg(margin)
                        .arg(align).arg(visibility);
            html += subHtml;
            if (result) {
                html += QLatin1String("</div>");
            }
        }
    } else {
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        MimeTreeParser::NodeHelper::AttachmentDisplayInfo info = MimeTreeParser::NodeHelper::attachmentDisplayInfo(node);
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        if (info.displayInHeader) {
            html += QLatin1String("<div style=\"float:left;\">");
            html += QStringLiteral("<span style=\"white-space:nowrap; border-width: 0px; border-left-width: 5px; border-color: %1; 2px; border-left-style: solid;\">").arg(bgColor.name());
            mNodeHelper->writeNodeToTempFile(node);
            const QString href = mNodeHelper->asHREF(node, QStringLiteral("header"));
            html += QLatin1String("<a href=\"") + href +
                    QLatin1String("\">");
            QString imageMaxSize;
            if (!info.icon.isEmpty()) {
                QImage tmpImg(info.icon);
                if (tmpImg.width() > 48 || tmpImg.height() > 48) {
                    imageMaxSize = QStringLiteral("width=\"48\" height=\"48\"");
                }
            }
            html += QStringLiteral("<img %1 style=\"vertical-align:middle;\" src=\"").arg(imageMaxSize) + info.icon + QLatin1String("\"/>&nbsp;");
            const int elidedTextSize = headerStylePlugin()->elidedTextSize();
            if (elidedTextSize == -1) {
                html += info.label;
            } else {
                QFont bodyFont = mCSSHelper->bodyFont(mUseFixedFont);
                QFontMetrics fm(bodyFont);
                html += fm.elidedText(info.label, Qt::ElideRight, elidedTextSize);
            }
            html += QLatin1String("</a></span></div> ");
        }
    }

    Q_FOREACH (KMime::Content *extraNode, mNodeHelper->extraContents(node)) {
        html += renderAttachments(extraNode, bgColor);
    }

    KMime::Content *next  = MessageCore::NodeHelper::nextSibling(node);
    if (next) {
        html += renderAttachments(next, nextColor(bgColor));
    }

    return html;
}

KMime::Content *ViewerPrivate::findContentByType(KMime::Content *content, const QByteArray &type)
{
    auto list = content->contents();
    Q_FOREACH (KMime::Content *c, list) {
        if (c->contentType()->mimeType() ==  type) {
            return c;
        }
    }
    return 0;

}

//-----------------------------------------------------------------------------
const QTextCodec *ViewerPrivate::codecForName(const QByteArray &_str)
{
    if (_str.isEmpty()) {
        return 0;
    }
    QByteArray codec = _str.toLower();
    return KCharsets::charsets()->codecForName(QLatin1String(codec));
}

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void ViewerPrivate::update(MimeTreeParser::UpdateMode updateMode)
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{
    // Avoid flicker, somewhat of a cludge
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    if (updateMode == MimeTreeParser::Force) {
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        // stop the timer to avoid calling updateReaderWin twice
        mUpdateReaderWinTimer.stop();
        saveRelativePosition();
        updateReaderWin();
    } else if (mUpdateReaderWinTimer.isActive()) {
        mUpdateReaderWinTimer.setInterval(150);
    } else {
        mUpdateReaderWinTimer.start(0);
    }
}

void ViewerPrivate::slotUrlOpen(const QUrl &url)
{
    if (!url.isEmpty()) {
        mClickedUrl = url;
    }

    // First, let's see if the URL handler manager can handle the URL. If not, try KRun for some
    // known URLs, otherwise fallback to emitting a signal.
    // That signal is caught by KMail, and in case of mailto URLs, a composer is shown.