Add UIFeature to hide public space and room creation (#30708)

* Add settings to hide public room & space creation.

* Add space changes.

* Add room changes.

* lint

* Add playwright tests

* don't specialcase 1 join rule

* Ensure mocks get cleared

* Fixup test

* Add SpaceCreateMenu component unit-tests

* Fixup create room test asserts

* fix import

src/components/views/dialogs/CreateRoomDialog.tsx

@@ -85,6 +85,7 @@ interface IState {
 export default class CreateRoomDialog extends React.Component<IProps, IState> {
     private readonly askToJoinEnabled: boolean;
     private readonly advancedSettingsEnabled: boolean;
+    private readonly allowCreatingPublicRooms: boolean;
     private readonly supportsRestricted: boolean;
     private nameField = createRef<Field>();
     private aliasField = createRef<RoomAliasField>();
@@ -94,11 +95,13 @@ export default class CreateRoomDialog extends React.Component<IProps, IState> {
 
         this.askToJoinEnabled = SettingsStore.getValue("feature_ask_to_join");
         this.advancedSettingsEnabled = SettingsStore.getValue(UIFeature.AdvancedSettings);
+        this.allowCreatingPublicRooms = SettingsStore.getValue(UIFeature.AllowCreatingPublicRooms);
 
         this.supportsRestricted = !!this.props.parentSpace;
+        const defaultPublic = this.allowCreatingPublicRooms && this.props.defaultPublic;
 
         let joinRule = JoinRule.Invite;
-        if (this.props.defaultPublic) {
+        if (defaultPublic) {
             joinRule = JoinRule.Public;
         } else if (this.supportsRestricted) {
             joinRule = JoinRule.Restricted;
@@ -106,7 +109,7 @@ export default class CreateRoomDialog extends React.Component<IProps, IState> {
 
         const cli = MatrixClientPeg.safeGet();
         this.state = {
-            isPublicKnockRoom: this.props.defaultPublic || false,
+            isPublicKnockRoom: defaultPublic || false,
             isEncrypted: this.props.defaultEncrypted ?? privateShouldBeEncrypted(cli),
             joinRule,
             name: this.props.defaultName || "",
@@ -419,7 +422,7 @@ export default class CreateRoomDialog extends React.Component<IProps, IState> {
                             labelKnock={
                                 this.askToJoinEnabled ? _t("room_settings|security|join_rule_knock") : undefined
                             }
-                            labelPublic={_t("common|public_room")}
+                            labelPublic={this.allowCreatingPublicRooms ? _t("common|public_room") : undefined}
                             labelRestricted={
                                 this.supportsRestricted ? _t("create_room|join_rule_restricted") : undefined
                             }

src/components/views/elements/JoinRuleDropdown.tsx

@@ -19,7 +19,7 @@ interface IProps {
     width?: number;
     labelInvite: string;
     labelKnock?: string;
-    labelPublic: string;
+    labelPublic?: string;
     labelRestricted?: string; // if omitted then this option will be hidden, e.g if unsupported
     onChange(value: JoinRule): void;
 }
@@ -38,11 +38,18 @@ const JoinRuleDropdown: React.FC<IProps> = ({
         <div key={JoinRule.Invite} className="mx_JoinRuleDropdown_invite">
             {labelInvite}
         </div>,
-        <div key={JoinRule.Public} className="mx_JoinRuleDropdown_public">
-            {labelPublic}
-        </div>,
     ] as NonEmptyArray<ReactElement & { key: string }>;
 
+    if (labelPublic) {
+        options.push(
+            (
+                <div key={JoinRule.Public} className="mx_JoinRuleDropdown_public">
+                    {labelPublic}
+                </div>
+            ) as ReactElement & { key: string },
+        );
+    }
+
     if (labelKnock) {
         options.unshift(
             (
@@ -72,6 +79,7 @@ const JoinRuleDropdown: React.FC<IProps> = ({
             menuWidth={width}
             value={value}
             label={label}
+            disabled={options.length === 1}
         >
             {options}
         </Dropdown>

src/components/views/spaces/SpaceCreateMenu.tsx

@@ -45,6 +45,8 @@ import defaultDispatcher from "../../../dispatcher/dispatcher";
 import { Action } from "../../../dispatcher/actions";
 import { Filter } from "../dialogs/spotlight/Filter";
 import { type OpenSpotlightPayload } from "../../../dispatcher/payloads/OpenSpotlightPayload.ts";
+import { useSettingValue } from "../../../hooks/useSettings.ts";
+import { UIFeature } from "../../../settings/UIFeature.ts";
 
 export const createSpace = async (
     client: MatrixClient,
@@ -212,7 +214,10 @@ const SpaceCreateMenu: React.FC<{
     onFinished(): void;
 }> = ({ onFinished }) => {
     const cli = useMatrixClientContext();
-    const [visibility, setVisibility] = useState<Visibility | null>(null);
+    const settingAllowPublicSpaces = useSettingValue(UIFeature.AllowCreatingPublicSpaces);
+    const [visibility, setVisibility] = useState<Visibility | null>(
+        settingAllowPublicSpaces === false ? Visibility.Private : null,
+    );
     const [busy, setBusy] = useState<boolean>(false);
 
     const [name, setName] = useState("");
@@ -303,16 +308,20 @@ const SpaceCreateMenu: React.FC<{
     } else {
         body = (
             <React.Fragment>
-                <AccessibleButton
-                    className="mx_SpaceCreateMenu_back"
-                    onClick={() => setVisibility(null)}
-                    title={_t("action|go_back")}
-                />
+                {settingAllowPublicSpaces && (
+                    <AccessibleButton
+                        className="mx_SpaceCreateMenu_back"
+                        onClick={() => setVisibility(null)}
+                        title={_t("action|go_back")}
+                    />
+                )}
 
                 <h2>
                     {visibility === Visibility.Public
                         ? _t("create_space|public_heading")
-                        : _t("create_space|private_heading")}
+                        : settingAllowPublicSpaces
+                          ? _t("create_space|private_heading")
+                          : _t("create_space|private_only_heading")}
                 </h2>
                 <p>
                     {_t("create_space|add_details_prompt")} {_t("create_space|add_details_prompt_2")}