Allow to load cid element

messageviewer/src/viewer/viewer_p.cpp

@@ -51,6 +51,7 @@
 #include <KActionMenu>
 #include <KCharsets>
 #include <QPrintPreviewDialog>
+#include <QWebEngineUrlScheme>
 
 #include <QMenu>
 #include <KMessageBox>
@@ -188,6 +189,11 @@ ViewerPrivate::ViewerPrivate(Viewer *aParent, QWidget *mainWindow, KActionCollec
                                     + QByteArray::number(reinterpret_cast<quintptr>(this)), this))
     , mPreviouslyViewedItemId(-1)
 {
+    QWebEngineUrlScheme cidScheme("cid");
+    cidScheme.setFlags(QWebEngineUrlScheme::SecureScheme | QWebEngineUrlScheme::ContentSecurityPolicyIgnored);
+    cidScheme.setSyntax(QWebEngineUrlScheme::Syntax::Path);
+    QWebEngineUrlScheme::registerScheme(cidScheme);
+
     if (!mainWindow) {
         mMainWindow = aParent;
     }

messageviewer/src/viewer/webengine/mailwebengineview.cpp

@@ -26,6 +26,7 @@
 #include "blockexternalresourcesurlinterceptor/blockexternalresourcesurlinterceptor.h"
 #include "blockmailtrackingurlinterceptor/blockmailtrackingurlinterceptor.h"
 #include "cidreferencesurlinterceptor/cidreferencesurlinterceptor.h"
+#include "cidschemehandler/cidschemehandler.h"
 #include <WebEngineViewer/InterceptorManager>
 #include <WebEngineViewer/WebEngineManageScript>
 
@@ -33,6 +34,7 @@
 #include "scamdetection/scamcheckshorturl.h"
 #include <QContextMenuEvent>
 #include <WebEngineViewer/WebHitTest>
+#include <QWebEngineProfile>
 
 #include <QPrinter>
 
@@ -91,6 +93,8 @@ MailWebEngineView::MailWebEngineView(KActionCollection *ac, QWidget *parent)
             &MailWebEngineView::openUrl);
     connect(this, &MailWebEngineView::loadFinished, this, &MailWebEngineView::slotLoadFinished);
 
+    d->mPageEngine->profile()->installUrlSchemeHandler(QByteArrayLiteral("cid"), new CidSchemeHandler(this));
+
     d->mNetworkAccessManager = new WebEngineViewer::InterceptorManager(this, ac, this);
     d->mExternalReference = new MessageViewer::LoadExternalReferencesUrlInterceptor(this);
     d->mNetworkAccessManager->addInterceptor(d->mExternalReference);