diff --git a/mimetreeparser/src/viewer/messagepart.h b/mimetreeparser/src/viewer/messagepart.h
--- a/mimetreeparser/src/viewer/messagepart.h
+++ b/mimetreeparser/src/viewer/messagepart.h
@@ -106,14 +106,22 @@
     /** @see NodeHelper::asHREF */
     QString attachmentLink() const;
 
+    /** Returns a string respresentation of an URL that can be used
+     *  to invoke a BodyPartURLHandler for this body part.
+     */
+    QString makeLink(const QString &path) const;
+
     void setIsRoot(bool root);
     bool isRoot() const;
 
     virtual bool isHtml() const;
     virtual bool isHidden() const;
 
     PartMetaData *partMetaData() const;
 
+    Interface::BodyPartMemento *memento() const;
+    void setMemento(Interface::BodyPartMemento *memento);
+
     /* only a function that should be removed if the refactoring is over */
     virtual void fix() const;
 
diff --git a/mimetreeparser/src/viewer/messagepart.cpp b/mimetreeparser/src/viewer/messagepart.cpp
--- a/mimetreeparser/src/viewer/messagepart.cpp
+++ b/mimetreeparser/src/viewer/messagepart.cpp
@@ -47,6 +47,7 @@
 #include <KLocalizedString>
 
 #include <QTextCodec>
+#include <QUrl>
 
 using namespace MimeTreeParser;
 
@@ -99,6 +100,16 @@
     return &d->mMetaData;
 }
 
+Interface::BodyPartMemento* MessagePart::memento() const
+{
+    return nodeHelper()->bodyPartMemento(content(), "__plugin__");
+}
+
+void MessagePart::setMemento(Interface::BodyPartMemento *memento)
+{
+    nodeHelper()->setBodyPartMemento(content(), "__plugin__", memento);
+}
+
 KMime::Content *MessagePart::content() const
 {
     return d->mNode;
@@ -134,6 +145,18 @@
     return mOtp->nodeHelper()->asHREF(content(), QStringLiteral("body"));
 }
 
+QString MessagePart::makeLink(const QString &path) const
+{
+    // FIXME: use a PRNG for the first arg, instead of a serial number
+    static int serial = 0;
+    if (path.isEmpty()) {
+        return {};
+    }
+    return QStringLiteral("x-kmail:/bodypart/%1/%2/%3")
+           .arg(serial++).arg(content()->index().toString())
+           .arg(QString::fromLatin1(QUrl::toPercentEncoding(path, "/")));
+}
+
 void MessagePart::setIsRoot(bool root)
 {
     d->mRoot = root;
diff --git a/mimetreeparser/src/viewer/partnodebodypart.h b/mimetreeparser/src/viewer/partnodebodypart.h
--- a/mimetreeparser/src/viewer/partnodebodypart.h
+++ b/mimetreeparser/src/viewer/partnodebodypart.h
@@ -54,7 +54,7 @@
 public:
     explicit PartNodeBodyPart(ObjectTreeParser *otp, ProcessResult *result, KMime::Content *topLevelContent, KMime::Content *content, NodeHelper *nodeHelper);
 
-    QString makeLink(const QString &path) const override;
+    MIMETREEPARSER_DEPRECATED QString makeLink(const QString &path) const override;
     QString asText() const override;
     QByteArray asBinary() const override;
     QString contentTypeParameter(const char *param) const override;