From 12c63eddded9f02369bd4e569f62acfdd95cc723 Mon Sep 17 00:00:00 2001
From: Melvin Keskin <melvo@olomono.de>
Date: Thu, 2 Sep 2021 23:37:24 +0200
Subject: Add QXmppOmemoEnvelope
MIME-Version: 1.0
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Co-authored-by: Germán Márquez Mejía <mancho@olomono.de>
---
 src/base/QXmppOmemoData.cpp | 153 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 153 insertions(+)

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

diff --git a/src/base/QXmppOmemoData.cpp b/src/base/QXmppOmemoData.cpp
index 84170c24..6fb2580d 100644
--- a/src/base/QXmppOmemoData.cpp
+++ b/src/base/QXmppOmemoData.cpp
@@ -26,6 +26,7 @@
 #include "QXmppOmemoDeviceBundle.h"
 #include "QXmppOmemoDeviceElement.h"
 #include "QXmppOmemoDeviceList.h"
+#include "QXmppOmemoEnvelope.h"
 #include "QXmppUtils.h"
 
 #include <QDomElement>
@@ -465,3 +466,155 @@ bool QXmppOmemoDeviceBundle::isOmemoDeviceBundle(const QDomElement &element)
     return element.tagName() == QStringLiteral("bundle") &&
         element.namespaceURI() == ns_omemo_1;
 }
+
+///
+/// \class QXmppOmemoEnvelope
+///
+/// \brief The QXmppOmemoEnvelope class represents an OMEMO envelope as
+/// defined by \xep{0384, OMEMO Encryption}.
+///
+/// \since QXmpp 1.5
+///
+
+class QXmppOmemoEnvelopePrivate : public QSharedData
+{
+public:
+    uint32_t recipientDeviceId = 0;
+    bool isUsedForKeyExchange = false;
+    QByteArray data;
+};
+
+///
+/// Constructs an OMEMO envelope.
+///
+QXmppOmemoEnvelope::QXmppOmemoEnvelope()
+    : d(new QXmppOmemoEnvelopePrivate)
+{
+}
+
+///
+/// Constructs a copy of \a other.
+///
+/// \param other
+///
+QXmppOmemoEnvelope::QXmppOmemoEnvelope(const QXmppOmemoEnvelope &other) = default;
+
+QXmppOmemoEnvelope::~QXmppOmemoEnvelope() = default;
+
+///
+/// Assigns \a other to this OMEMO envelope.
+///
+/// \param other
+///
+QXmppOmemoEnvelope &QXmppOmemoEnvelope::operator=(const QXmppOmemoEnvelope &other) = default;
+
+///
+/// Returns the ID of the recipient's device.
+///
+/// The ID is 0 if it is unset.
+///
+/// \return the recipient's device ID
+///
+uint32_t QXmppOmemoEnvelope::recipientDeviceId() const
+{
+    return d->recipientDeviceId;
+}
+
+///
+/// Sets the ID of the recipient's device.
+///
+/// A valid ID must be at least 1 and at most 2^32-1.
+///
+/// \param id recipient's device ID
+///
+void QXmppOmemoEnvelope::setRecipientDeviceId(const uint32_t id)
+{
+    d->recipientDeviceId = id;
+}
+
+///
+/// Returns true if a pre-key was used to prepare this envelope.
+///
+/// The default is false.
+///
+/// \return true if a pre-key was used to prepare this envelope, otherwise false
+///
+bool QXmppOmemoEnvelope::isUsedForKeyExchange() const
+{
+    return d->isUsedForKeyExchange;
+}
+
+///
+/// Sets whether a pre-key was used to prepare this envelope.
+///
+/// \param isUsed whether a pre-key was used to prepare this envelope
+///
+void QXmppOmemoEnvelope::setIsUsedForKeyExchange(const bool isUsed)
+{
+    d->isUsedForKeyExchange = isUsed;
+}
+
+///
+/// Returns the BLOB containing the data for the underlying double ratchet library.
+///
+/// It should be treated like an obscure BLOB being passed as is to the ratchet
+/// library for further processing.
+///
+/// \return the binary data for the ratchet library
+///
+QByteArray QXmppOmemoEnvelope::data() const
+{
+    return d->data;
+}
+
+///
+/// Sets the BLOB containing the data from the underlying double ratchet library.
+///
+/// It should be treated like an obscure BLOB produced by the ratchet library.
+///
+/// \param data binary data from the ratchet library
+///
+void QXmppOmemoEnvelope::setData(const QByteArray &data)
+{
+    d->data = data;
+}
+
+/// \cond
+void QXmppOmemoEnvelope::parse(const QDomElement &element)
+{
+    d->recipientDeviceId = element.attribute("rid").toInt();
+
+    const auto isUsedForKeyExchange = element.attribute("kex");
+    if (isUsedForKeyExchange == "true" || isUsedForKeyExchange == "1") {
+        d->isUsedForKeyExchange = true;
+    }
+
+    d->data = QByteArray::fromBase64(element.text().toLatin1());
+}
+
+void QXmppOmemoEnvelope::toXml(QXmlStreamWriter *writer) const
+{
+    writer->writeStartElement("key");
+    writer->writeAttribute("rid", QString::number(d->recipientDeviceId));
+
+    if (d->isUsedForKeyExchange) {
+        helperToXmlAddAttribute(writer, "kex", "true");
+    }
+
+    writer->writeCharacters(d->data.toBase64());
+    writer->writeEndElement();
+}
+/// \endcond
+
+///
+/// Determines whether the given DOM element is an OMEMO envelope.
+///
+/// \param element DOM element being checked
+///
+/// \return true if element is an OMEMO envelope, otherwise false
+///
+bool QXmppOmemoEnvelope::isOmemoEnvelope(const QDomElement &element)
+{
+    return element.tagName() == QStringLiteral("key") &&
+        element.namespaceURI() == ns_omemo_1;
+}
-- 
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