From 66e5f060abe831fa08a758b9de44b29bfec8b3ba Mon Sep 17 00:00:00 2001
From: Melvin Keskin <melvo@olomono.de>
Date: Sun, 16 Oct 2022 19:59:49 +0200
Subject: Implement XEP-0444: Message Reactions (#492)

https://xmpp.org/extensions/xep-0444.html
---
 src/base/QXmppMessageReaction.cpp | 132 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 src/base/QXmppMessageReaction.cpp

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

diff --git a/src/base/QXmppMessageReaction.cpp b/src/base/QXmppMessageReaction.cpp
new file mode 100644
index 00000000..4bf9dcb3
--- /dev/null
+++ b/src/base/QXmppMessageReaction.cpp
@@ -0,0 +1,132 @@
+// SPDX-FileCopyrightText: 2022 Melvin Keskin <melvo@olomono.de>
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+#include "QXmppMessageReaction.h"
+
+#include "QXmppConstants_p.h"
+#include "QXmppUtils.h"
+
+#include <QDomElement>
+
+class QXmppMessageReactionPrivate : public QSharedData
+{
+public:
+    QString messageId;
+    QVector<QString> emojis;
+};
+
+///
+/// \class QXmppMessageReaction
+///
+/// \brief The QXmppMessageReaction class represents a reaction to a message in the form of emojis
+/// as specified by \xep{0444, Message Reactions}.
+///
+/// \since QXmpp 1.5
+///
+
+///
+/// Constructs a message reaction.
+///
+QXmppMessageReaction::QXmppMessageReaction()
+    : d(new QXmppMessageReactionPrivate)
+{
+}
+
+QXMPP_PRIVATE_DEFINE_RULE_OF_SIX(QXmppMessageReaction)
+
+///
+/// Returns the ID of the message for that the reaction is sent.
+///
+/// For a group chat message, \code QXmppMessage::stanzaId() \endcode is used.
+///
+/// For other message types, \code QXmppMessage::originId() \endcode is used.
+/// If that is not available, \code QXmppMessage::id() \endcode is used.
+///
+/// \return the message's ID
+///
+QString QXmppMessageReaction::messageId() const
+{
+    return d->messageId;
+}
+
+///
+/// Sets the ID of the message for that the reaction is sent.
+///
+/// For a group chat message, \code QXmppMessage::stanzaId() \endcode must be used.
+/// If there is no such ID, a message reaction must not be sent.
+///
+/// For other message types, \code QXmppMessage::originId() \endcode should be used.
+/// If that is not available, \code QXmppMessage::id() \endcode should be used.
+///
+/// \param messageId message's ID
+///
+void QXmppMessageReaction::setMessageId(const QString &messageId)
+{
+    d->messageId = messageId;
+}
+
+///
+/// Returns the emojis in reaction to a message.
+///
+/// \return the emoji reactions
+///
+QVector<QString> QXmppMessageReaction::emojis() const
+{
+    return d->emojis;
+}
+
+///
+/// Sets the emojis in reaction to a message.
+///
+/// Each reaction should only consist of unicode codepoints that can be displayed as a single emoji.
+/// Duplicates are not allowed.
+///
+/// \param emojis emoji reactions
+///
+void QXmppMessageReaction::setEmojis(const QVector<QString> &emojis)
+{
+    d->emojis = emojis;
+}
+
+/// \cond
+void QXmppMessageReaction::parse(const QDomElement &element)
+{
+    d->messageId = element.attribute(QStringLiteral("id"));
+
+    for (auto childElement = element.firstChildElement();
+         !childElement.isNull();
+         childElement = childElement.nextSiblingElement()) {
+        d->emojis.append(childElement.text());
+    }
+
+    // Remove duplicate emojis.
+    std::sort(d->emojis.begin(), d->emojis.end());
+    d->emojis.erase(std::unique(d->emojis.begin(), d->emojis.end()), d->emojis.end());
+}
+
+void QXmppMessageReaction::toXml(QXmlStreamWriter *writer) const
+{
+    writer->writeStartElement(QStringLiteral("reactions"));
+    writer->writeDefaultNamespace(ns_reactions);
+    writer->writeAttribute(QStringLiteral("id"), d->messageId);
+
+    for (const auto &reaction : d->emojis) {
+        helperToXmlAddTextElement(writer, QStringLiteral("reaction"), reaction);
+    }
+    writer->writeEndElement();
+}
+/// \endcond
+
+///
+/// Determines whether the given DOM element is a message reaction element.
+///
+/// \param element DOM element being checked
+///
+/// \return true if element is a message reaction element, otherwise false
+///
+bool QXmppMessageReaction::isMessageReaction(const QDomElement &element)
+{
+    return element.tagName() == QStringLiteral("reactions") &&
+        element.namespaceURI() == ns_reactions;
+}
-- 
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