Join rule event

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 +1,106 @@
+// 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 {
+Q_NAMESPACE_EXPORT(QUOTIENT_API)
+
+//! \brief Definition of an allow AllowCondition
+//!
+//! \sa https://spec.matrix.org/latest/client-server-api/#mroomjoin_ruless
+struct AllowCondition {
+    QString roomId;
+    QString type;
+};
+
+//! Enum representing the available room join rules
+enum JoinRule {
+    Public,
+    Knock,
+    Invite,
+    Private,
+    Restricted,
+    KnockRestricted,
+};
+Q_ENUM_NS(JoinRule)
+
+[[maybe_unused]] constexpr std::array JoinRuleStrings {
+    "public"_L1,
+    "knock"_L1,
+    "invite"_L1,
+    "private"_L1,
+    "restricted"_L1,
+    "knock_restricted"_L1,
+};
+
+//! \brief The content of a join rule event
+//!
+//! \sa https://spec.matrix.org/latest/client-server-api/#mroomjoin_rules
+struct JoinRuleContent {
+    JoinRule 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 {
+        enumFromJsonString<EventContent::JoinRule>(jo["join_rule"_L1].toString(), EventContent::JoinRuleStrings).value_or(EventContent::Public),
+        fromJson<QList<EventContent::AllowCondition>>(jo["allow"_L1])
+    };
+}
+
+template<>
+inline auto toJson(const EventContent::JoinRuleContent& c)
+{
+    QJsonObject jo;
+    addParam<IfNotEmpty>(jo, "join_rule"_L1, enumToJsonString<EventContent::JoinRule>(c.joinRule, EventContent::JoinRuleStrings));
+    addParam<IfNotEmpty>(jo, "allow"_L1, c.allow);
+    return jo;
+}
+
+//! \brief Class to define a join rule state event.
+//!
+//! \sa Quotient::StateEvent, https://spec.matrix.org/latest/client-server-api/#mroomjoin_rules
+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.
+    //!
+    //! \sa https://spec.matrix.org/latest/client-server-api/#mroomjoin_rules
+    EventContent::JoinRule joinRule() const { return content().joinRule; }
+
+    //! \brief The allow rules for restricted rooms.
+    //!
+    //! \sa https://spec.matrix.org/latest/client-server-api/#mroomjoin_rules
+    QList<EventContent::AllowCondition> allow() const { return content().allow; }
+};
+} // namespace Quotient

Quotient/room.cpp

@@ -52,6 +52,7 @@
 #include "events/roomavatarevent.h"
 #include "events/roomcanonicalaliasevent.h"
 #include "events/roomcreateevent.h"
+#include "events/roomjoinrulesevent.h"
 #include "events/roommemberevent.h"
 #include "events/roompowerlevelsevent.h"
 #include "events/roomtombstoneevent.h"
@@ -1534,6 +1535,36 @@ RoomStateView Room::currentState() const
     return d->currentState;
 }
 
+EventContent::JoinRule Room::joinRule() const
+{
+    return currentState().queryOr(&JoinRulesEvent::joinRule, EventContent::Public);
+}
+
+QList<QString> Room::allowIds() const
+{
+    QList<QString> allowIds;
+    for (const auto& allowCondition : currentState().queryOr(&JoinRulesEvent::allow, QList<EventContent::AllowCondition>())) {
+        allowIds.append(allowCondition.roomId);
+    }
+    return allowIds;
+}
+
+void Room::setJoinRule(EventContent::JoinRule newRule, const QList<QString>& allowedRooms)
+{
+    if (memberEffectivePowerLevel() < powerLevelFor<JoinRulesEvent>()) {
+        return;
+    }
+
+    EventContent::JoinRule actualRule = (newRule == EventContent::Restricted || newRule == EventContent::KnockRestricted) && allowedRooms.isEmpty() ? EventContent::Invite : newRule;
+    QList<EventContent::AllowCondition> newAllow;
+    for (const auto& room :allowedRooms) {
+        newAllow.append({room, "m.room_membership"_L1});
+    }
+    setState<JoinRulesEvent>(actualRule, newAllow);
+    // Not emitting joinRuleChanged() here, since that would override the change
+    // in the UI with the *current* value, which is not the *new* value.
+}
+
 int Room::memberEffectivePowerLevel(const UserId& memberId) const
 {
     return currentState().get<RoomPowerLevelsEvent>()->powerLevelForUser(
@@ -3208,6 +3239,14 @@ Room::Change Room::Private::processStateEvent(const RoomEvent& curEvent,
 
             return Change::Other;
         },
+        [this, oldEvent](const JoinRulesEvent& evt) {
+            if (const auto* oldJRE = static_cast<const JoinRulesEvent*>(oldEvent);
+                oldJRE && oldJRE->content().joinRule != evt.content().joinRule
+            ) {
+                emit q->joinRuleChanged();
+            }
+            return Change::Other;
+        },
         Change::Other);
 }
 

Quotient/room.h

@@ -25,6 +25,7 @@
 #include "events/roommessageevent.h"
 #include "events/roompowerlevelsevent.h"
 #include "events/roomtombstoneevent.h"
+#include <Quotient/events/roomjoinrulesevent.h>
 
 #include <QtCore/QJsonObject>
 #include <QtGui/QImage>
@@ -165,6 +166,8 @@ class QUOTIENT_API Room : public QObject {
     Q_PROPERTY(QStringList tagNames READ tagNames NOTIFY tagsChanged)
     Q_PROPERTY(bool isFavourite READ isFavourite NOTIFY tagsChanged STORED false)
     Q_PROPERTY(bool isLowPriority READ isLowPriority NOTIFY tagsChanged STORED false)
+    Q_PROPERTY(EventContent::JoinRule joinRule READ joinRule WRITE setJoinRule NOTIFY joinRuleChanged)
+    Q_PROPERTY(QList<QString> allowIds READ allowIds NOTIFY joinRuleChanged)
 
     Q_PROPERTY(GetRoomEventsJob* eventsHistoryJob READ eventsHistoryJob NOTIFY eventsHistoryJobChanged)
     Q_PROPERTY(int requestedHistorySize READ requestedHistorySize NOTIFY eventsHistoryJobChanged)
@@ -672,6 +675,35 @@ class QUOTIENT_API Room : public QObject {
     /// \brief Get the current room state
     RoomStateView currentState() const;
 
+    //! \brief The current Join Rule for the room
+    //!
+    //! \sa https://spec.matrix.org/latest/client-server-api/#mroomjoin_rules
+    EventContent::JoinRule joinRule() const;
+
+    //! \brief Set the Join Rule for the room
+    //!
+    //! If the local user does not have a high enough power level the request is rejected.
+    //!
+    //! \param newRule the new JoinRule to apply to the room
+    //! \param allowedRooms only required when the join rule is restricted. This is a
+    //!        list of room IDs that members of can join without an invite.
+    //!        If the rule is restricted and this list is empty it is treated as a join
+    //!        rule of invite instead.
+    //!
+    //! \note While any room ID is permitted it is designed to be only spaces that are
+    //!       input. I.e. only memebers of space `x` can join this room.
+    //!
+    //! \sa https://spec.matrix.org/latest/client-server-api/#mroomjoin_rules
+    Q_INVOKABLE void setJoinRule(EventContent::JoinRule newRule, const QList<QString>& allowedRooms = {});
+
+    //! \brief The list of Room IDs for when the join rule is Restricted
+    //!
+    //! This value will be empty when the Join Rule is not Restricted or
+    //! Knock-Restricted.
+    //!
+    //! \sa https://spec.matrix.org/latest/client-server-api/#mroomjoin_rules
+    QList<QString> allowIds() const;
+
     //! \brief The effective power level of the given member in the room
     //!
     //! This is normally the same as calling `RoomPowerLevelEvent::powerLevelForUser(userId)` but
@@ -896,6 +928,9 @@ public Q_SLOTS:
     void topicChanged();
     void avatarChanged();
 
+    //! \brief The join rule for the room has changed
+    void joinRuleChanged();
+
     //! \brief A new member has joined the room
     //!
     //! This can be from any previous state or a member previously unknown to