Add customisation point for visibility of invites and room creation

Fixes https://github.com/vector-im/element-web/issues/19331

src/SlashCommands.tsx

@@ -44,7 +44,7 @@ import { Action } from "./dispatcher/actions";
 import { EffectiveMembership, getEffectiveMembership, leaveRoomBehaviour } from "./utils/membership";
 import SdkConfig from "./SdkConfig";
 import SettingsStore from "./settings/SettingsStore";
-import { UIFeature } from "./settings/UIFeature";
+import { UIComponent, UIFeature } from "./settings/UIFeature";
 import { CHAT_EFFECTS } from "./effects";
 import CallHandler from "./CallHandler";
 import { guessAndSetDMRoom } from "./Rooms";
@@ -56,6 +56,7 @@ import InfoDialog from "./components/views/dialogs/InfoDialog";
 import SlashCommandHelpDialog from "./components/views/dialogs/SlashCommandHelpDialog";
 
 import { logger } from "matrix-js-sdk/src/logger";
+import { shouldShowComponent } from "./customisations/helpers/UIComponents";
 
 // XXX: workaround for https://github.com/microsoft/TypeScript/issues/31816
 interface HTMLInputEvent extends Event {
@@ -403,6 +404,7 @@ export const Commands = [
         command: 'invite',
         args: '<user-id> [<reason>]',
         description: _td('Invites user with given id to current room'),
+        isEnabled: () => shouldShowComponent(UIComponent.InviteUsers),
         runFn: function(roomId, args) {
             if (args) {
                 const [address, reason] = args.split(/\s+(.+)/);

src/components/structures/SpaceRoomView.tsx

@@ -81,6 +81,8 @@ import GroupAvatar from "../views/avatars/GroupAvatar";
 import { useDispatcher } from "../../hooks/useDispatcher";
 
 import { logger } from "matrix-js-sdk/src/logger";
+import { shouldShowComponent } from "../../customisations/helpers/UIComponents";
+import { UIComponent } from "../../settings/UIFeature";
 
 interface IProps {
     space: Room;
@@ -411,7 +413,7 @@ const SpaceLanding = ({ space }) => {
     const userId = cli.getUserId();
 
     let inviteButton;
-    if (myMembership === "join" && space.canInvite(userId)) {
+    if (myMembership === "join" && space.canInvite(userId) && shouldShowComponent(UIComponent.InviteUsers)) {
         inviteButton = (
             <AccessibleButton
                 kind="primary"

src/components/views/right_panel/UserInfo.tsx

@@ -72,6 +72,8 @@ import { ComposerInsertPayload } from "../../../dispatcher/payloads/ComposerInse
 import SpaceStore from "../../../stores/SpaceStore";
 
 import { logger } from "matrix-js-sdk/src/logger";
+import { shouldShowComponent } from "../../../customisations/helpers/UIComponents";
+import { UIComponent } from "../../../settings/UIFeature";
 
 export interface IDevice {
     deviceId: string;
@@ -393,7 +395,7 @@ const UserOptionsSection: React.FC<{
             );
         }
 
-        if (canInvite && (!member || !member.membership || member.membership === 'leave')) {
+        if (canInvite && (member?.membership ?? 'leave') === 'leave' && shouldShowComponent(UIComponent.InviteUsers)) {
             const roomId = member && member.roomId ? member.roomId : RoomViewStore.getRoomId();
             const onInviteUserButton = async () => {
                 try {

src/components/views/rooms/MemberList.tsx

@@ -44,6 +44,8 @@ import MemberTile from "./MemberTile";
 import BaseAvatar from '../avatars/BaseAvatar';
 import { throttle } from 'lodash';
 import SpaceStore from "../../../stores/SpaceStore";
+import { shouldShowComponent } from "../../../customisations/helpers/UIComponents";
+import { UIComponent } from "../../../settings/UIFeature";
 
 const getSearchQueryLSKey = (roomId: string) => `mx_MemberList_searchQuarry_${roomId}`;
 
@@ -530,7 +532,7 @@ export default class MemberList extends React.Component<IProps, IState> {
         const room = cli.getRoom(this.props.roomId);
         let inviteButton;
 
-        if (room && room.getMyMembership() === 'join') {
+        if (room?.getMyMembership() === 'join' && shouldShowComponent(UIComponent.InviteUsers)) {
             let inviteButtonText = _t("Invite to this room");
             const chat = CommunityPrototypeStore.instance.getSelectedCommunityGeneralChat();
             if (chat && chat.roomId === this.props.roomId) {

src/components/views/rooms/NewRoomIntro.tsx

@@ -28,15 +28,17 @@ import AccessibleButton from "../elements/AccessibleButton";
 import MiniAvatarUploader, { AVATAR_SIZE } from "../elements/MiniAvatarUploader";
 import RoomAvatar from "../avatars/RoomAvatar";
 import defaultDispatcher from "../../../dispatcher/dispatcher";
+import dis from "../../../dispatcher/dispatcher";
 import { ViewUserPayload } from "../../../dispatcher/payloads/ViewUserPayload";
 import { Action } from "../../../dispatcher/actions";
-import dis from "../../../dispatcher/dispatcher";
 import SpaceStore from "../../../stores/SpaceStore";
 import { showSpaceInvite } from "../../../utils/space";
 import { privateShouldBeEncrypted } from "../../../createRoom";
 import EventTileBubble from "../messages/EventTileBubble";
 import { ROOM_SECURITY_TAB } from "../dialogs/RoomSettingsDialog";
 import { MatrixClientPeg } from "../../../MatrixClientPeg";
+import { shouldShowComponent } from "../../../customisations/helpers/UIComponents";
+import { UIComponent } from "../../../settings/UIFeature";
 
 function hasExpectedEncryptionSettings(matrixClient: MatrixClient, room: Room): boolean {
     const isEncrypted: boolean = matrixClient.isRoomEncrypted(room.roomId);
@@ -150,7 +152,7 @@ const NewRoomIntro = () => {
                     { _t("Invite to just this room") }
                 </AccessibleButton> }
             </div>;
-        } else if (room.canInvite(cli.getUserId())) {
+        } else if (room.canInvite(cli.getUserId()) && shouldShowComponent(UIComponent.InviteUsers)) {
             buttons = <div className="mx_NewRoomIntro_buttons">
                 <AccessibleButton
                     className="mx_NewRoomIntro_inviteButton"

src/components/views/rooms/RoomList.tsx

@@ -49,6 +49,8 @@ import { showAddExistingRooms, showCreateNewRoom, showSpaceInvite } from "../../
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 import RoomAvatar from "../avatars/RoomAvatar";
 import AccessibleTooltipButton from "../elements/AccessibleTooltipButton";
+import { shouldShowComponent } from "../../../customisations/helpers/UIComponents";
+import { UIComponent } from "../../../settings/UIFeature";
 
 interface IProps {
     onKeyDown: (ev: React.KeyboardEvent) => void;
@@ -133,6 +135,9 @@ const TAG_AESTHETICS: ITagAestheticsMap = {
                     MatrixClientPeg.get().getUserId());
 
                 return <IconizedContextMenuOptionList first>
+                    {
+                        shouldShowComponent(UIComponent.CreateRooms)
+                            ? (<>
                                 <IconizedContextMenuOption
                                     label={_t("Create new room")}
                                     iconClassName="mx_RoomList_iconPlus"
@@ -159,6 +164,9 @@ const TAG_AESTHETICS: ITagAestheticsMap = {
                                     tooltip={canAddRooms ? undefined
                                         : _t("You do not have permissions to add rooms to this space")}
                                 />
+                            </>)
+                            : null
+                    }
                     <IconizedContextMenuOption
                         label={_t("Explore rooms")}
                         iconClassName="mx_RoomList_iconBrowse"

src/components/views/rooms/RoomSublist.tsx

@@ -55,6 +55,8 @@ import { ListNotificationState } from "../../../stores/notifications/ListNotific
 import IconizedContextMenu from "../context_menus/IconizedContextMenu";
 import { getKeyBindingsManager, RoomListAction } from "../../../KeyBindingsManager";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
+import { shouldShowComponent } from "../../../customisations/helpers/UIComponents";
+import { UIComponent } from "../../../settings/UIFeature";
 
 const SHOW_N_BUTTON_HEIGHT = 28; // As defined by CSS
 const RESIZE_HANDLE_HEIGHT = 4; // As defined by CSS
@@ -675,7 +677,7 @@ export default class RoomSublist extends React.Component<IProps, IState> {
                     );
 
                     let addRoomButton = null;
-                    if (!!this.props.onAddRoom) {
+                    if (!!this.props.onAddRoom && shouldShowComponent(UIComponent.CreateRooms)) {
                         addRoomButton = (
                             <AccessibleTooltipButton
                                 tabIndex={tabIndex}
@@ -687,6 +689,7 @@ export default class RoomSublist extends React.Component<IProps, IState> {
                             />
                         );
                     } else if (this.props.addRoomContextMenu) {
+                        // We assume that shouldShowComponent() is checked by the context menu itself.
                         addRoomButton = (
                             <ContextMenuTooltipButton
                                 tabIndex={tabIndex}

src/components/views/spaces/SpacePublicShare.tsx

@@ -24,6 +24,8 @@ import { copyPlaintext } from "../../../utils/strings";
 import { RoomPermalinkCreator } from "../../../utils/permalinks/Permalinks";
 import { showRoomInviteDialog } from "../../../RoomInvite";
 import { MatrixClientPeg } from "../../../MatrixClientPeg";
+import { shouldShowComponent } from "../../../customisations/helpers/UIComponents";
+import { UIComponent } from "../../../settings/UIFeature";
 
 interface IProps {
     space: Room;
@@ -51,7 +53,8 @@ const SpacePublicShare = ({ space, onFinished }: IProps) => {
             <h3>{ _t("Share invite link") }</h3>
             <span>{ copiedText }</span>
         </AccessibleButton>
-        { space.canInvite(MatrixClientPeg.get()?.getUserId()) ? <AccessibleButton
+        { space.canInvite(MatrixClientPeg.get()?.getUserId()) && shouldShowComponent(UIComponent.InviteUsers)
+            ? <AccessibleButton
                 className="mx_SpacePublicShare_inviteButton"
                 onClick={() => {
                     if (onFinished) onFinished();
@@ -60,7 +63,8 @@ const SpacePublicShare = ({ space, onFinished }: IProps) => {
             >
                 <h3>{ _t("Invite people") }</h3>
                 <span>{ _t("Invite with email or username") }</span>
-        </AccessibleButton> : null }
+            </AccessibleButton>
+            : null }
     </div>;
 };
 

src/customisations/ComponentVisibility.ts

@@ -0,0 +1,51 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Dev note: this customisation point is heavily inspired by UIFeature flags, though
+// with an intention of being used for more complex switching on whether or not a feature
+// should be shown.
+
+// Populate this class with the details of your customisations when copying it.
+
+import { UIComponent } from "../settings/UIFeature";
+
+/**
+ * Determines whether or not the active MatrixClient user should be able to use
+ * the given UI component. If shown, the user might still not be able to use the
+ * component depending on their contextual permissions. For example, invite options
+ * might be shown to the user but they won't have permission to invite users to
+ * the current room: the button will appear disabled.
+ * @param {UIComponent} component The component to check visibility for.
+ * @returns {boolean} True (default) if the user is able to see the component, false
+ * otherwise.
+ */
+function shouldShowComponent(component: UIComponent): boolean {
+    return true; // default to visible
+}
+
+// This interface summarises all available customisation points and also marks
+// them all as optional. This allows customisers to only define and export the
+// customisations they need while still maintaining type safety.
+export interface IComponentVisibilityCustomisations {
+    shouldShowComponent?: typeof shouldShowComponent;
+}
+
+// A real customisation module will define and export one or more of the
+// customisation points that make up the interface above.
+export const ComponentVisibilityCustomisations: IComponentVisibilityCustomisations = {
+    // while we don't specify the functions here, their defaults are described
+    // in their pseudo-implementations above.
+};

src/customisations/helpers/UIComponents.ts

@@ -0,0 +1,22 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { UIComponent } from "../../settings/UIFeature";
+import { ComponentVisibilityCustomisations } from "../ComponentVisibility";
+
+export function shouldShowComponent(component: UIComponent): boolean {
+    return ComponentVisibilityCustomisations.shouldShowComponent?.(component) ?? true;
+}

src/settings/UIFeature.ts

@@ -33,3 +33,8 @@ export enum UIFeature {
     AdvancedSettings = "UIFeature.advancedSettings",
     RoomHistorySettings = "UIFeature.roomHistorySettings",
 }
+
+export enum UIComponent {
+    InviteUsers = "UIComponent.sendInvites",
+    CreateRooms = "UIComponent.roomCreation",
+}