Apply strictNullChecks to src/LegacyCallHandler.tsx (#10690)

src/LegacyCallHandler.tsx

@@ -18,6 +18,7 @@ limitations under the License.
 */
 
 import React from "react";
+import { MatrixError } from "matrix-js-sdk/src/matrix";
 import {
     CallError,
     CallErrorCode,
@@ -29,7 +30,7 @@ import {
 } from "matrix-js-sdk/src/webrtc/call";
 import { logger } from "matrix-js-sdk/src/logger";
 import EventEmitter from "events";
-import { RuleId, TweakName, Tweaks } from "matrix-js-sdk/src/@types/PushRules";
+import { RuleId, TweakName } from "matrix-js-sdk/src/@types/PushRules";
 import { PushProcessor } from "matrix-js-sdk/src/pushprocessor";
 import { SyncState } from "matrix-js-sdk/src/sync";
 import { CallEventHandlerEvent } from "matrix-js-sdk/src/webrtc/callEventHandler";
@@ -65,6 +66,7 @@ import { getJoinedNonFunctionalMembers } from "./utils/room/getJoinedNonFunction
 import { localNotificationsAreSilenced } from "./utils/notifications";
 import { SdkContextClass } from "./contexts/SDKContext";
 import { showCantStartACallDialog } from "./voice-broadcast/utils/showCantStartACallDialog";
+import { isNotNull } from "./Typeguards";
 
 export const PROTOCOL_PSTN = "m.protocol.pstn";
 export const PROTOCOL_PSTN_PREFIXED = "im.vector.protocol.pstn";
@@ -582,7 +584,9 @@ export default class LegacyCallHandler extends EventEmitter {
         call.on(CallEvent.Hangup, () => {
             if (!mappedRoomId || !this.matchesCallForThisRoom(call)) return;
 
+            if (isNotNull(mappedRoomId)) {
                 this.removeCallForRoom(mappedRoomId);
+            }
         });
         call.on(CallEvent.State, (newState: CallState, oldState: CallState) => {
             this.onCallStateChanged(newState, oldState, call);
@@ -598,8 +602,10 @@ export default class LegacyCallHandler extends EventEmitter {
                 this.pause(AudioID.Ringback);
             }
 
+            if (isNotNull(mappedRoomId)) {
                 this.removeCallForRoom(mappedRoomId);
                 this.addCallForRoom(mappedRoomId, newCall);
+            }
             this.setCallListeners(newCall);
             this.setCallState(newCall, newCall.state);
         });
@@ -635,7 +641,7 @@ export default class LegacyCallHandler extends EventEmitter {
 
                 const newMappedRoomId = this.roomIdForCall(call);
                 logger.log(`Old room ID: ${mappedRoomId}, new room ID: ${newMappedRoomId}`);
-                if (newMappedRoomId && newMappedRoomId !== mappedRoomId) {
+                if (newMappedRoomId !== mappedRoomId && isNotNull(mappedRoomId) && isNotNull(newMappedRoomId)) {
                     this.removeCallForRoom(mappedRoomId);
                     mappedRoomId = newMappedRoomId;
                     logger.log("Moving call to room " + mappedRoomId);
@@ -675,8 +681,11 @@ export default class LegacyCallHandler extends EventEmitter {
                     RuleId.IncomingCall,
                 );
                 const pushRuleEnabled = incomingCallPushRule?.enabled;
+                // actions can be either Tweaks | PushRuleActionName, ie an object or a string type enum
+                // and we want to only run this check on the Tweaks
                 const tweakSetToRing = incomingCallPushRule?.actions.some(
-                    (action: Tweaks) => action.set_tweak === TweakName.Sound && action.value === "ring",
+                    (action) =>
+                        typeof action !== "string" && action.set_tweak === TweakName.Sound && action.value === "ring",
                 );
 
                 if (pushRuleEnabled && tweakSetToRing && !this.isForcedSilent()) {
@@ -692,7 +701,10 @@ export default class LegacyCallHandler extends EventEmitter {
             }
             case CallState.Ended: {
                 const hangupReason = call.hangupReason;
+                if (isNotNull(mappedRoomId)) {
                     this.removeCallForRoom(mappedRoomId);
+                }
+
                 if (oldState === CallState.InviteSent && call.hangupParty === CallParty.Remote) {
                     this.play(AudioID.Busy);
 
@@ -724,7 +736,9 @@ export default class LegacyCallHandler extends EventEmitter {
                     this.play(AudioID.CallEnd);
                 }
 
+                if (isNotNull(mappedRoomId)) {
                     this.logCallStats(call, mappedRoomId);
+                }
                 break;
             }
         }
@@ -1081,6 +1095,7 @@ export default class LegacyCallHandler extends EventEmitter {
 
         const roomId = await ensureDMExists(MatrixClientPeg.get(), nativeUserId);
 
+        if (isNotNull(roomId)) {
             dis.dispatch<ViewRoomPayload>({
                 action: Action.ViewRoom,
                 room_id: roomId,
@@ -1089,6 +1104,7 @@ export default class LegacyCallHandler extends EventEmitter {
 
             await this.placeMatrixCall(roomId, CallType.Voice, transferee);
         }
+    }
 
     public async startTransferToPhoneNumber(
         call: MatrixCall,
@@ -1183,9 +1199,11 @@ export default class LegacyCallHandler extends EventEmitter {
         // Prevent double clicking the call button
         const widget = WidgetStore.instance.getApps(roomId).find((app) => WidgetType.JITSI.matches(app.type));
         if (widget) {
-            const room = client.getRoom(roomId);
             // If there already is a Jitsi widget, pin it
-            if (room) WidgetLayoutStore.instance.moveToContainer(room, widget, Container.Top);
+            const room = client.getRoom(roomId);
+            if (isNotNull(room)) {
+                WidgetLayoutStore.instance.moveToContainer(room, widget, Container.Top);
+            }
             return;
         }
 
@@ -1193,7 +1211,7 @@ export default class LegacyCallHandler extends EventEmitter {
             await WidgetUtils.addJitsiWidget(roomId, type, "Jitsi", false);
             logger.log("Jitsi widget added");
         } catch (e) {
-            if (e.errcode === "M_FORBIDDEN") {
+            if (e instanceof MatrixError && e.errcode === "M_FORBIDDEN") {
                 Modal.createDialog(ErrorDialog, {
                     title: _t("Permission Required"),
                     description: _t("You do not have permission to start a conference call in this room"),

src/Typeguards.ts

@@ -0,0 +1,19 @@
+/*
+Copyright 2023 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.
+*/
+
+export function isNotNull<T>(arg: T): arg is Exclude<T, null> {
+    return arg !== null;
+}