From 5ec472c036f33e5f863847596c0d8e3d9e9643ef Mon Sep 17 00:00:00 2001
From: Linus Jahn <lnj@kaidan.im>
Date: Wed, 12 Feb 2020 21:24:43 +0100
Subject: Reapply "Implement MIX-PAM XEP-0405: Roster IQ extension"

This reverts commit 4af8f27d6bcbb44d349f4637d4653ac6ca3de09c.

On the XMPP summit the decision was made to stick to the roster
extension now. The custom protocol would in the end be like a copy of
the roster protocol. Thus, the roster iq extension should not be
removed or replaced with another protocol.
---
 src/base/QXmppRosterIq.cpp | 82 ++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 79 insertions(+), 3 deletions(-)

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

diff --git a/src/base/QXmppRosterIq.cpp b/src/base/QXmppRosterIq.cpp
index a930a3ca..a8e2ffc7 100644
--- a/src/base/QXmppRosterIq.cpp
+++ b/src/base/QXmppRosterIq.cpp
@@ -37,6 +37,8 @@ public:
     QList<QXmppRosterIq::Item> items;
     // XEP-0237 Roster Versioning
     QString version;
+    // XEP-0405: Mediated Information eXchange (MIX): Participant Server Requirements
+    bool mixAnnotate = false;
 };
 
 QXmppRosterIq::QXmppRosterIq()
@@ -84,6 +86,21 @@ void QXmppRosterIq::setVersion(const QString &version)
     d->version = version;
 }
 
+/// Whether to annotate which items are MIX channels.
+
+bool QXmppRosterIq::mixAnnotate() const
+{
+    return d->mixAnnotate;
+}
+
+/// Sets whether to include which roster items are MIX channels. This MUST only
+/// be enabled in get requests.
+
+void QXmppRosterIq::setMixAnnotate(bool mixAnnotate)
+{
+    d->mixAnnotate = mixAnnotate;
+}
+
 /// \cond
 bool QXmppRosterIq::isRosterIq(const QDomElement &element)
 {
@@ -93,15 +110,19 @@ bool QXmppRosterIq::isRosterIq(const QDomElement &element)
 void QXmppRosterIq::parseElementFromChild(const QDomElement &element)
 {
     QDomElement queryElement = element.firstChildElement("query");
-    QDomElement itemElement = queryElement.firstChildElement("item");
-
     setVersion(queryElement.attribute("ver"));
+
+    QDomElement itemElement = queryElement.firstChildElement("item");
     while (!itemElement.isNull()) {
         QXmppRosterIq::Item item;
         item.parse(itemElement);
         d->items.append(item);
-        itemElement = itemElement.nextSiblingElement();
+        itemElement = itemElement.nextSiblingElement("item");
     }
+
+    QDomElement annotateElement = queryElement.firstChildElement("annotate");
+    setMixAnnotate(!annotateElement.isNull() && annotateElement.namespaceURI()
+                   == ns_mix_roster);
 }
 
 void QXmppRosterIq::toXmlElementFromChild(QXmlStreamWriter *writer) const
@@ -112,6 +133,14 @@ void QXmppRosterIq::toXmlElementFromChild(QXmlStreamWriter *writer) const
     // XEP-0237 roster versioning - If the server does not advertise support for roster versioning, the client MUST NOT include the 'ver' attribute.
     if (!version().isEmpty())
         writer->writeAttribute("ver", version());
+
+    // XEP-0405: Mediated Information eXchange (MIX): Participant Server Requirements
+    if (d->mixAnnotate) {
+        writer->writeStartElement("annotate");
+        writer->writeAttribute("xmlns", ns_mix_roster);
+        writer->writeEndElement();
+    }
+
     for (int i = 0; i < d->items.count(); ++i)
         d->items.at(i).toXml(writer);
     writer->writeEndElement();
@@ -127,6 +156,9 @@ public:
     // can be subscribe/unsubscribe (attribute "ask")
     QString subscriptionStatus;
     QSet<QString> groups;
+    // XEP-0405: Mediated Information eXchange (MIX): Participant Server Requirements
+    bool isMixChannel = false;
+    QString mixParticipantId;
 };
 
 /// Constructs a new roster entry.
@@ -287,6 +319,34 @@ void QXmppRosterIq::Item::setSubscriptionTypeFromStr(const QString &type)
         qWarning("QXmppRosterIq::Item::setTypeFromStr(): invalid type");
 }
 
+/// Returns whether this is a MIX channel.
+
+bool QXmppRosterIq::Item::isMixChannel() const
+{
+    return d->isMixChannel;
+}
+
+/// Sets whether this is a MIX channel.
+
+void QXmppRosterIq::Item::setIsMixChannel(bool isMixChannel)
+{
+    d->isMixChannel = isMixChannel;
+}
+
+/// Returns the participant id for this MIX channel.
+
+QString QXmppRosterIq::Item::mixParticipantId() const
+{
+    return d->mixParticipantId;
+}
+
+/// Sets the participant id for this MIX channel.
+
+void QXmppRosterIq::Item::setMixParticipantId(const QString& participantId)
+{
+    d->mixParticipantId = participantId;
+}
+
 /// \cond
 void QXmppRosterIq::Item::parse(const QDomElement &element)
 {
@@ -300,6 +360,13 @@ void QXmppRosterIq::Item::parse(const QDomElement &element)
         d->groups << groupElement.text();
         groupElement = groupElement.nextSiblingElement("group");
     }
+
+    // XEP-0405: Mediated Information eXchange (MIX): Participant Server Requirements
+    QDomElement channelElement = element.firstChildElement("channel");
+    if (!channelElement.isNull() && channelElement.namespaceURI() == ns_mix_roster) {
+        d->isMixChannel = true;
+        d->mixParticipantId = channelElement.attribute("participant-id");
+    }
 }
 
 void QXmppRosterIq::Item::toXml(QXmlStreamWriter *writer) const
@@ -315,6 +382,15 @@ void QXmppRosterIq::Item::toXml(QXmlStreamWriter *writer) const
         helperToXmlAddTextElement(writer, "group", *i);
         ++i;
     }
+
+    // XEP-0405: Mediated Information eXchange (MIX): Participant Server Requirements
+    if (d->isMixChannel) {
+        writer->writeStartElement("channel");
+        writer->writeAttribute("xmlns", ns_mix_roster);
+        helperToXmlAddAttribute(writer, "participant-id", d->mixParticipantId);
+        writer->writeEndElement();
+    }
+
     writer->writeEndElement();
 }
 /// \endcond
-- 
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