Stick behind a feature flag

src/Notifier.js

@@ -120,11 +120,11 @@ const Notifier = {
         };
     },
 
-    _playAudioNotification: function(ev, room) {
-        this.getSoundForRoom(room.roomId).then((sound) => {
-            console.log(`Got sound ${sound.name || "default"} for ${room.roomId}`);
-            // XXX: How do we ensure this is a sound file and not
-            // going to be exploited?
+    _playAudioNotification: async function(ev, room) {
+        const sound = SettingsStore.isFeatureEnabled("feature_notification_sounds") ? await this.getSoundForRoom(room.roomId) : null;
+        console.log(`Got sound ${sound.name || "default"} for ${room.roomId}`);
+        // XXX: How do we ensure this is a sound file and not going to be exploited?
+        try {
             const selector = document.querySelector(sound ? `audio[src='${sound.url}']` : "#messageAudio");
             let audioElement = selector;
             if (!selector) {
@@ -139,9 +139,9 @@ const Notifier = {
                 document.body.appendChild(audioElement);
             }
             audioElement.play();
-        }).catch((ex) => {
+        } catch (ex) {
             console.warn("Caught error when trying to fetch room notification sound:", ex);
-        });
+        }
     },
 
     start: function() {

src/components/views/dialogs/RoomSettingsDialog.js

@@ -25,6 +25,7 @@ import SecurityRoomSettingsTab from "../settings/tabs/room/SecurityRoomSettingsT
 import NotificationSettingsTab from "../settings/tabs/room/NotificationSettingsTab";
 import sdk from "../../../index";
 import MatrixClientPeg from "../../../MatrixClientPeg";
+import SettingsStore from '../../../settings/SettingsStore';
 
 export default class RoomSettingsDialog extends React.Component {
     static propTypes = {
@@ -50,11 +51,15 @@ export default class RoomSettingsDialog extends React.Component {
             "mx_RoomSettingsDialog_rolesIcon",
             <RolesRoomSettingsTab roomId={this.props.roomId} />,
         ));
-        tabs.push(new Tab(
-            _td("Notifications"),
-            "mx_RoomSettingsDialog_rolesIcon",
-            <NotificationSettingsTab roomId={this.props.roomId} />,
-        ));
+
+        if (SettingsStore.isFeatureEnabled("feature_notification_sounds")) {
+            tabs.push(new Tab(
+                _td("Notifications"),
+                "mx_RoomSettingsDialog_rolesIcon",
+                <NotificationSettingsTab roomId={this.props.roomId} />,
+            ));
+        }
+
         tabs.push(new Tab(
             _td("Advanced"),
             "mx_RoomSettingsDialog_warningIcon",

src/components/views/settings/tabs/room/NotificationSettingsTab.js

@@ -115,7 +115,7 @@ export default class NotificationsSettingsTab extends React.Component {
                 <div className='mx_SettingsTab_section mx_SettingsTab_subsectionText'>
                     <span className='mx_SettingsTab_subheading'>{_t("Sounds")}</span>
                     <div>
-                        <span>{_t("Notification sound")}: <code>{this.state.currentSound}</code></span>
+                        <span>{_t("Custom Notification Sounds")}: <code>{this.state.currentSound}</code></span>
                     </div>
                     <div>
                         <h3>{_t("Set a new custom sound")}</h3>

src/i18n/strings/en_EN.json

@@ -1616,7 +1616,7 @@
     "Failed to remove tag %(tagName)s from room": "Failed to remove tag %(tagName)s from room",
     "Failed to add tag %(tagName)s to room": "Failed to add tag %(tagName)s to room",
     "Sounds": "Sounds",
-    "Notification sound": "Notification sound",
+    "Custom Notification Sounds": "Notification sound",
     "Set a new custom sound": "Set a new custom sound",
     "Reset to default sound": "Reset to default sound"
 }

src/settings/Settings.js

@@ -119,6 +119,12 @@ export const SETTINGS = {
         supportedLevels: LEVELS_FEATURE,
         default: false,
     },
+    "feature_notification_sounds": {
+        isFeature: true,
+        displayName: _td("Custom Notification Sounds"),
+        supportedLevels: LEVELS_FEATURE,
+        default: false,
+    },
     "MessageComposerInput.suggestEmoji": {
         supportedLevels: LEVELS_ACCOUNT_SETTINGS,
         displayName: _td('Enable Emoji suggestions while typing'),