From ceb62dd9d0d86bc8327ace116930962cf7fad1e9 Mon Sep 17 00:00:00 2001
From: Melvin Keskin <melvo@olomono.de>
Date: Mon, 9 May 2022 21:45:49 +0200
Subject: Implement XEP-0384: OMEMO Encryption v0.8

This implements XEP-0384 in version v0.8 with a manager and storage
classes to be user-implemented for persistant storage.

The license of the code is LGPL-2.1-or-later as usual.  However since
libomemo-c (libsignal-protocol-c) is GPL-3.0, the built binary is always
licensed under GPL-3.0.  Having our code LGPL licensed will make it
avoids relicensing in the future in case we port it to an LGPL
compatible omemo library.

Closes #133.

Co-authored-by: Linus Jahn <lnj@kaidan.im>
---
 src/base/QXmppMessage.cpp | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

(limited to 'src/base/QXmppMessage.cpp')

diff --git a/src/base/QXmppMessage.cpp b/src/base/QXmppMessage.cpp
index d583fd7e..2f0fb5fe 100644
--- a/src/base/QXmppMessage.cpp
+++ b/src/base/QXmppMessage.cpp
@@ -11,8 +11,10 @@
 #include "QXmppConstants_p.h"
 #include "QXmppGlobal_p.h"
 #include "QXmppMixInvitation.h"
+#ifdef BUILD_OMEMO
 #include "QXmppOmemoElement_p.h"
 #include "QXmppOmemoEnvelope_p.h"
+#endif
 #include "QXmppTrustMessageElement.h"
 #include "QXmppUtils.h"
 
@@ -136,10 +138,10 @@ public:
     // XEP-0382: Spoiler messages
     bool isSpoiler;
     QString spoilerHint;
-
+#ifdef BUILD_OMEMO
     // XEP-0384: OMEMO Encryption
     std::optional<QXmppOmemoElement> omemoElement;
-
+#endif
     // XEP-0407: Mediated Information eXchange (MIX): Miscellaneous Capabilities
     std::optional<QXmppMixInvitation> mixInvitation;
 
@@ -1078,6 +1080,8 @@ void QXmppMessage::setSpoilerHint(const QString &spoilerHint)
         d->isSpoiler = true;
 }
 
+#ifdef BUILD_OMEMO
+/// \cond
 ///
 /// Returns an included OMEMO element as defined by \xep{0384, OMEMO Encryption}.
 ///
@@ -1097,6 +1101,8 @@ void QXmppMessage::setOmemoElement(const std::optional<QXmppOmemoElement> &omemo
 {
     d->omemoElement = omemoElement;
 }
+/// \endcond
+#endif
 
 ///
 /// Returns an included \xep{0369}: Mediated Information eXchange (MIX)
@@ -1297,6 +1303,7 @@ bool QXmppMessage::parseExtension(const QDomElement &element, QXmpp::SceMode sce
             d->encryptionName = element.attribute(QStringLiteral("name"));
             return true;
         }
+#ifdef BUILD_OMEMO
         // XEP-0384: OMEMO Encryption
         if (QXmppOmemoElement::isOmemoElement(element)) {
             QXmppOmemoElement omemoElement;
@@ -1304,6 +1311,7 @@ bool QXmppMessage::parseExtension(const QDomElement &element, QXmpp::SceMode sce
             d->omemoElement = omemoElement;
             return true;
         }
+#endif
         // XEP-0428: Fallback Indication
         if (checkElement(element, QStringLiteral("fallback"), ns_fallback_indication)) {
             d->isFallback = true;
@@ -1523,10 +1531,12 @@ void QXmppMessage::serializeExtensions(QXmlStreamWriter *writer, QXmpp::SceMode
             writer->writeEndElement();
         }
 
+#ifdef BUILD_OMEMO
         // XEP-0384: OMEMO Encryption
         if (d->omemoElement) {
             d->omemoElement->toXml(writer);
         }
+#endif
 
         // XEP-0428: Fallback Indication
         if (d->isFallback) {
-- 
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