Add roster versioning stream feature

4 files changed, 40 insertions, 8 deletions

diff --git a/src/base/QXmppConstants.cpp b/src/base/QXmppConstants.cpp
index a98a7ff0..94aec45a 100644
--- a/src/base/QXmppConstants.cpp
+++ b/src/base/QXmppConstants.cpp
@@ -33,6 +33,7 @@ const char* ns_bind = "urn:ietf:params:xml:ns:xmpp-bind";
 const char* ns_session = "urn:ietf:params:xml:ns:xmpp-session";
 const char* ns_stanza = "urn:ietf:params:xml:ns:xmpp-stanzas";
 const char* ns_pre_approval = "urn:xmpp:features:pre-approval";
+const char* ns_rosterver = "urn:xmpp:features:rosterver";
 // XEP-0009: Jabber-RPC
 const char* ns_rpc = "jabber:iq:rpc";
 // XEP-0020: Feature Negotiation
diff --git a/src/base/QXmppConstants_p.h b/src/base/QXmppConstants_p.h
index 125e6d19..85d3eaa0 100644
--- a/src/base/QXmppConstants_p.h
+++ b/src/base/QXmppConstants_p.h
@@ -45,6 +45,7 @@ extern const char* ns_bind;
 extern const char* ns_session;
 extern const char* ns_stanza;
 extern const char* ns_pre_approval;
+extern const char* ns_rosterver;
 // XEP-0009: Jabber-RPC
 extern const char* ns_rpc;
 // XEP-0020: Feature Negotiation
diff --git a/src/base/QXmppStreamFeatures.cpp b/src/base/QXmppStreamFeatures.cpp
index 25626aa0..70d4dc46 100644
--- a/src/base/QXmppStreamFeatures.cpp
+++ b/src/base/QXmppStreamFeatures.cpp
@@ -40,6 +40,7 @@ public:
     QXmppStreamFeatures::Mode csiMode;
     QXmppStreamFeatures::Mode registerMode;
     bool preApprovedSubscriptionsSupported;
+    bool rosterVersioningSupported;
     QStringList authMechanisms;
     QStringList compressionMethods;
 };
@@ -206,6 +207,26 @@ void QXmppStreamFeatures::setPreApprovedSubscriptionsSupported(bool supported)
     d->preApprovedSubscriptionsSupported = supported;
 }
 
+///
+/// Returns whether roster versioning from RFC6121 is supported.
+///
+/// \since QXmpp 1.3
+///
+bool QXmppStreamFeatures::rosterVersioningSupported() const
+{
+    return d->rosterVersioningSupported;
+}
+
+///
+/// Sets whether roster versioning from RFC6121 is supported.
+///
+/// \since QXmpp 1.3
+///
+void QXmppStreamFeatures::setRosterVersioningSupported(bool supported)
+{
+    d->rosterVersioningSupported = supported;
+}
+
 /// \cond
 bool QXmppStreamFeatures::isStreamFeatures(const QDomElement &element)
 {
@@ -251,6 +272,7 @@ void QXmppStreamFeatures::parse(const QDomElement &element)
     d->csiMode = readFeature(element, "csi", ns_csi);
     d->registerMode = readFeature(element, "register", ns_register_feature);
     d->preApprovedSubscriptionsSupported = readBooleanFeature(element, QStringLiteral("sub"), ns_pre_approval);
+    d->rosterVersioningSupported = readBooleanFeature(element, QStringLiteral("ver"), ns_rosterver);
 
     // parse advertised compression methods
     QDomElement compression = element.firstChildElement(QStringLiteral("compression"));
@@ -284,6 +306,15 @@ static void writeFeature(QXmlStreamWriter *writer, const char *tagName, const ch
     }
 }
 
+static void writeBoolenFeature(QXmlStreamWriter *writer, const QString &tagName, const QString &xmlns, bool enabled)
+{
+    if (enabled) {
+        writer->writeStartElement(tagName);
+        writer->writeDefaultNamespace(xmlns);
+        writer->writeEndElement();
+    }
+}
+
 void QXmppStreamFeatures::toXml(QXmlStreamWriter *writer) const
 {
     writer->writeStartElement(QStringLiteral("stream:features"));
@@ -294,24 +325,20 @@ void QXmppStreamFeatures::toXml(QXmlStreamWriter *writer) const
     writeFeature(writer, "sm", ns_stream_management, d->streamManagementMode);
     writeFeature(writer, "csi", ns_csi, d->csiMode);
     writeFeature(writer, "register", ns_register_feature, d->registerMode);
-
-    if (d->preApprovedSubscriptionsSupported) {
-        writer->writeStartElement(QStringLiteral("sub"));
-        writer->writeDefaultNamespace(ns_pre_approval);
-        writer->writeEndElement();
-    }
+    writeBoolenFeature(writer, QStringLiteral("sub"), ns_pre_approval, d->preApprovedSubscriptionsSupported);
+    writeBoolenFeature(writer, QStringLiteral("ver"), ns_rosterver, d->rosterVersioningSupported);
 
     if (!d->compressionMethods.isEmpty()) {
         writer->writeStartElement(QStringLiteral("compression"));
         writer->writeDefaultNamespace(ns_compressFeature);
-        for (const auto &method : d->compressionMethods)
+        for (const auto &method : qAsConst(d->compressionMethods))
             writer->writeTextElement(QStringLiteral("method"), method);
         writer->writeEndElement();
     }
     if (!d->authMechanisms.isEmpty()) {
         writer->writeStartElement(QStringLiteral("mechanisms"));
         writer->writeDefaultNamespace(ns_sasl);
-        for (const auto &mechanism : d->authMechanisms)
+        for (const auto &mechanism : qAsConst(d->authMechanisms))
             writer->writeTextElement(QStringLiteral("mechanism"), mechanism);
         writer->writeEndElement();
     }
diff --git a/src/base/QXmppStreamFeatures.h b/src/base/QXmppStreamFeatures.h
index ed439788..d6e6f3ba 100644
--- a/src/base/QXmppStreamFeatures.h
+++ b/src/base/QXmppStreamFeatures.h
@@ -79,6 +79,9 @@ public:
     bool preApprovedSubscriptionsSupported() const;
     void setPreApprovedSubscriptionsSupported(bool);
 
+    bool rosterVersioningSupported() const;
+    void setRosterVersioningSupported(bool);
+
     /// \cond
     void parse(const QDomElement &element) override;
     void toXml(QXmlStreamWriter *writer) const override;