Upstream join rule event from neochat

CMakeLists.txt

@@ -150,6 +150,7 @@ target_sources(${QUOTIENT_LIB_NAME} PUBLIC FILE_SET HEADERS BASE_DIRS .
         Quotient/events/eventcontent.h
         Quotient/events/eventrelation.h
         Quotient/events/roomcreateevent.h
+        Quotient/events/roomjoinrulesevent.h
         Quotient/events/roomtombstoneevent.h
         Quotient/events/roommessageevent.h
         Quotient/events/roommemberevent.h

Quotient/events/roomjoinrulesevent.h

@@ -0,0 +1,91 @@
+// SPDX-FileCopyrightText: 2025 James Graham <[email protected]>
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+#pragma once
+
+#include <Quotient/events/stateevent.h>
+
+namespace Quotient
+{
+namespace EventContent {
+    //! \brief Definition of an allow AllowCondition
+    //!
+    //! see https://spec.matrix.org/latest/client-server-api/#mroomjoin_rules for the
+    //! full definition.
+    struct AllowCondition {
+        QString roomId;
+        QString type;
+    };
+
+    //! \brief The content of a join rule event
+    //!
+    //! see https://spec.matrix.org/latest/client-server-api/#mroomjoin_rules for the
+    //! full definition.
+    struct JoinRuleContent {
+        QString joinRule;
+        QList<AllowCondition> allow;
+    };
+} // namespace EventContent
+
+template<>
+inline EventContent::AllowCondition fromJson(const QJsonObject& jo)
+{
+    return EventContent::AllowCondition {
+        fromJson<QString>(jo["room_id"_L1]),
+        fromJson<QString>(jo["type"_L1])
+    };
+}
+
+template<>
+inline auto toJson(const EventContent::AllowCondition& c)
+{
+    QJsonObject jo;
+    addParam<IfNotEmpty>(jo, "room_id"_L1, c.roomId);
+    addParam<IfNotEmpty>(jo, "type"_L1, c.type);
+    return jo;
+}
+
+template<>
+inline EventContent::JoinRuleContent fromJson(const QJsonObject& jo)
+{
+    return EventContent::JoinRuleContent {
+        fromJson<QString>(jo["join_rule"_L1]),
+        fromJson<QList<EventContent::AllowCondition>>(jo["allow"_L1])
+    };
+}
+
+template<>
+inline auto toJson(const EventContent::JoinRuleContent& c)
+{
+    QJsonObject jo;
+    addParam<IfNotEmpty>(jo, "join_rule"_L1, c.joinRule);
+    addParam<IfNotEmpty>(jo, "allow"_L1, c.allow);
+    return jo;
+}
+
+//! \brief Class to define a join rule state event.
+//!
+//! see https://spec.matrix.org/latest/client-server-api/#mroomjoin_rules for the
+//! full definition.
+//!
+//! \sa Quotient::StateEvent
+class JoinRulesEvent : public KeylessStateEventBase<JoinRulesEvent,
+    EventContent::JoinRuleContent>
+{
+public:
+    QUO_EVENT(JoinRulesEvent, "m.room.join_rules")
+    using KeylessStateEventBase::KeylessStateEventBase;
+
+    //! \brief The join rule for the room.
+    //!
+    //! see https://spec.matrix.org/latest/client-server-api/#mroomjoin_rules for
+    //! the available join rules for a room.
+    QString joinRule() const { return content().joinRule; }
+
+    //! \brief The allow rules for restricted rooms.
+    //!
+    //! see https://spec.matrix.org/latest/client-server-api/#mroomjoin_rules for
+    //! the full details on allow rules.
+    QList<EventContent::AllowCondition> allow() const { return content().allow; }
+};
+} // namespace Quotient