Add a way to block invites from all users

This is a useful safety feature, not just for people under attack but
also if you have no use for this feature. Currently this is gated for
servers that support Matrix CSAPI 1.18.

Fixes #662

src/libneochat/neochatconnection.cpp

@@ -62,6 +62,9 @@ void NeoChatConnection::connectSignals()
         if (type == u"m.identity_server"_s) {
             Q_EMIT identityServerChanged();
         }
+        if (type == u"m.invite_permission_config"_s) {
+            Q_EMIT blockAllInvitesChanged();
+        }
     });
     connect(this, &NeoChatConnection::requestFailed, this, [this](BaseJob *job) {
         if (job->error() == BaseJob::UserConsentRequired) {
@@ -636,4 +639,20 @@ void NeoChatConnection::setNoteForUser(const QString &userId, const QString &not
     setAccountData(QStringLiteral("org.kde.neochat.user_note"), object);
 }
 
+bool NeoChatConnection::blockAllInvites() const
+{
+    return accountDataJson("m.invite_permission_config"_L1)["default_action"_L1].toString() == "block"_L1;
+}
+
+void NeoChatConnection::setBlockAllInvites(bool block)
+{
+    auto object = accountDataJson(QStringLiteral("m.invite_permission_config"));
+    if (block) {
+        object["default_action"_L1] = "block"_L1;
+    } else {
+        object.remove("default_action"_L1);
+    }
+    setAccountData(QStringLiteral("m.invite_permission_config"), object);
+}
+
 #include "moc_neochatconnection.cpp"

src/libneochat/neochatconnection.h

@@ -100,6 +100,11 @@ class NeoChatConnection : public Quotient::Connection
      */
     Q_PROPERTY(bool isVerifiedSession READ isVerifiedSession NOTIFY ownSessionVerified)
 
+    /**
+     * @brief True if this account is blocking invites for all users.
+     */
+    Q_PROPERTY(bool blockAllInvites READ blockAllInvites WRITE setBlockAllInvites NOTIFY blockAllInvitesChanged)
+
 public:
     /**
      * @brief Defines the status after an attempt to change the password on an account.
@@ -244,6 +249,9 @@ public:
      */
     Q_INVOKABLE void setNoteForUser(const QString &userId, const QString &note);
 
+    bool blockAllInvites() const;
+    void setBlockAllInvites(bool block);
+
 Q_SIGNALS:
     void globalUrlPreviewEnabledChanged();
     void labelChanged();
@@ -283,6 +291,7 @@ Q_SIGNALS:
 
     void keyBackupUnlocked();
     void keyBackupError();
+    void blockAllInvitesChanged();
 
 private:
     static bool m_globalUrlPreviewDefault;

src/settings/NeoChatSecurityPage.qml

@@ -87,17 +87,31 @@ FormCard.FormCardPage {
         title: i18nc("@title:group", "Invites")
     }
     FormCard.FormCard {
-        FormCard.FormCheckDelegate {
+        FormCard.FormRadioDelegate {
+            text: i18nc("@info:label", "Everyone")
+            checked: !NeoChatConfig.rejectUnknownInvites && !root.connection.blockAllInvites
+            description: i18nc("@info:description", "Anyone can send you invites.")
+        }
+
+        FormCard.FormRadioDelegate {
             id: rejectInvitationsDelegate
-            text: i18nc("@option:check", "Reject invitations from unknown users")
-            description: root.connection.canCheckMutualRooms ? i18nc("@info", "If enabled, NeoChat will reject invitations from users you don't share a room with.") : i18nc("@info", "Your server does not support this setting.")
+            text: i18nc("@option:check", "Known users")
+            description: root.connection.canCheckMutualRooms ? i18nc("@info", "Only users you share a room with can send you invites.") : i18nc("@info", "Your server does not support this setting.")
             checked: NeoChatConfig.rejectUnknownInvites
             enabled: !NeoChatConfig.isRejectUnknownInvitesImmutable && root.connection.canCheckMutualRooms
-            onToggled: {
+            onCheckedChanged: {
                 NeoChatConfig.rejectUnknownInvites = checked;
                 NeoChatConfig.save();
             }
         }
+
+        FormCard.FormRadioDelegate {
+            text: i18nc("@info:label", "No one")
+            checked: root.connection.blockAllInvites
+            enabled: root.connection.supportsMatrixSpecVersion("v1.18")
+            description: root.connection.supportsMatrixSpecVersion("v1.18") ? i18nc("@info:description", "No one can send you invites.") : i18nc("@info", "Your server does not support this setting.")
+            onCheckedChanged: root.connection.blockAllInvites = checked
+        }
     }
     FormCard.FormHeader {
         title: i18nc("@title:group", "Encryption")