From a0095bc85041dc399ceb0e6bb8e06aaba8ac262e Mon Sep 17 00:00:00 2001
From: Melvin Keskin <melvo@olomono.de>
Date: Sat, 5 Mar 2022 19:20:27 +0100
Subject: Message: Add end-to-end encryption fallback body

---
 src/base/QXmppMessage.cpp | 40 ++++++++++++++++++++++++++++++++++++++++
 src/base/QXmppMessage.h   |  3 +++
 2 files changed, 43 insertions(+)

(limited to 'src/base')

diff --git a/src/base/QXmppMessage.cpp b/src/base/QXmppMessage.cpp
index 41b654ed..e493cf17 100644
--- a/src/base/QXmppMessage.cpp
+++ b/src/base/QXmppMessage.cpp
@@ -88,6 +88,7 @@ public:
     QXmppMessagePrivate();
 
     QString body;
+    QString e2eeFallbackBody;
     QString subject;
     QString thread;
     QString parentThread;
@@ -236,6 +237,36 @@ void QXmppMessage::setBody(const QString &body)
     d->body = body;
 }
 
+///
+/// Returns a body that is unlike the normal body not encrypted.
+///
+/// It can be presented to users if the message could not be decrypted (e.g.,
+/// because their clients do not support the used end-to-end encryption).
+///
+/// \return the end-to-end encryption fallback body
+///
+/// \since QXmpp 1.5
+///
+QString QXmppMessage::e2eeFallbackBody() const
+{
+    return d->e2eeFallbackBody;
+}
+
+///
+/// Sets a body that is unlike the normal body not encrypted.
+///
+/// It can be presented to users if the message could not be decrypted (e.g.,
+/// because their clients do not support the used end-to-end encryption).
+///
+/// \param fallbackBody end-to-end encryption fallback body
+///
+/// \since QXmpp 1.5
+///
+void QXmppMessage::setE2eeFallbackBody(const QString &fallbackBody)
+{
+    d->e2eeFallbackBody = fallbackBody;
+}
+
 /// Returns the message's type.
 
 QXmppMessage::Type QXmppMessage::type() const
@@ -1239,6 +1270,11 @@ void QXmppMessage::toXml(QXmlStreamWriter *writer, QXmpp::SceMode sceMode) const
 bool QXmppMessage::parseExtension(const QDomElement &element, QXmpp::SceMode sceMode)
 {
     if (sceMode & QXmpp::ScePublic) {
+        if (sceMode == QXmpp::ScePublic && element.tagName() == QStringLiteral("body")) {
+            d->e2eeFallbackBody = element.text();
+            return true;
+        }
+
         // XEP-0280: Message Carbons
         if (checkElement(element, QStringLiteral("private"), ns_carbons)) {
             d->privatemsg = true;
@@ -1445,6 +1481,10 @@ bool QXmppMessage::parseExtension(const QDomElement &element, QXmpp::SceMode sce
 void QXmppMessage::serializeExtensions(QXmlStreamWriter *writer, QXmpp::SceMode sceMode, const QString &baseNamespace) const
 {
     if (sceMode & QXmpp::ScePublic) {
+        if (sceMode == QXmpp::ScePublic && !d->e2eeFallbackBody.isEmpty()) {
+            writer->writeTextElement(QStringLiteral("body"), d->e2eeFallbackBody);
+        }
+
         // XEP-0280: Message Carbons
         if (d->privatemsg) {
             writer->writeStartElement(QStringLiteral("private"));
diff --git a/src/base/QXmppMessage.h b/src/base/QXmppMessage.h
index bdd47800..b7db3eab 100644
--- a/src/base/QXmppMessage.h
+++ b/src/base/QXmppMessage.h
@@ -108,6 +108,9 @@ public:
     QString body() const;
     void setBody(const QString &);
 
+    QString e2eeFallbackBody() const;
+    void setE2eeFallbackBody(const QString &fallbackBody);
+
     QString subject() const;
     void setSubject(const QString &);
 
-- 
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