Add voice broadcast recording stores (#9319)

* Add voice broadcast recording stores

* Refactor startNewVoiceBroadcastRecording

src/voice-broadcast/stores/VoiceBroadcastRecordingsStore.ts

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+/*
+Copyright 2022 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 { MatrixClient, MatrixEvent } from "matrix-js-sdk/src/matrix";
+import { TypedEventEmitter } from "matrix-js-sdk/src/models/typed-event-emitter";
+
+import { VoiceBroadcastRecording } from "..";
+
+export enum VoiceBroadcastRecordingsStoreEvent {
+    CurrentChanged = "current_changed",
+}
+
+interface EventMap {
+    [VoiceBroadcastRecordingsStoreEvent.CurrentChanged]: (recording: VoiceBroadcastRecording) => void;
+}
+
+/**
+ * This store provides access to the current and specific Voice Broadcast recordings.
+ */
+export class VoiceBroadcastRecordingsStore extends TypedEventEmitter<VoiceBroadcastRecordingsStoreEvent, EventMap> {
+    private _current: VoiceBroadcastRecording | null;
+    private recordings = new Map<string, VoiceBroadcastRecording>();
+
+    public constructor() {
+        super();
+    }
+
+    public setCurrent(current: VoiceBroadcastRecording): void {
+        if (this._current === current) return;
+
+        this._current = current;
+        this.recordings.set(current.infoEvent.getId(), current);
+        this.emit(VoiceBroadcastRecordingsStoreEvent.CurrentChanged, current);
+    }
+
+    public get current(): VoiceBroadcastRecording {
+        return this._current;
+    }
+
+    public getByInfoEvent(infoEvent: MatrixEvent, client: MatrixClient): VoiceBroadcastRecording {
+        const infoEventId = infoEvent.getId();
+
+        if (!this.recordings.has(infoEventId)) {
+            this.recordings.set(infoEventId, new VoiceBroadcastRecording(infoEvent, client));
+        }
+
+        return this.recordings.get(infoEventId);
+    }
+
+    public static readonly _instance = new VoiceBroadcastRecordingsStore();
+
+    /**
+     * TODO Michael W: replace when https://github.com/matrix-org/matrix-react-sdk/pull/9293 has been merged
+     */
+    public static instance() {
+        return VoiceBroadcastRecordingsStore._instance;
+    }
+}

src/voice-broadcast/stores/index.ts

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+/*
+Copyright 2022 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 * from "./VoiceBroadcastRecordingsStore";