FEATURE: implemented a client side blacklist

front/src/WebRtc/BlackListManager.ts

@@ -0,0 +1,24 @@
+import {Subject} from 'rxjs';
+
+class BlackListManager {
+    private list: number[] = [];
+    public onBlockStream: Subject<number> = new Subject();
+    public onUnBlockStream: Subject<number> = new Subject();
+    
+    isBlackListed(userId: number): boolean {
+        return this.list.find((data) => data === userId) !== undefined;
+    }
+    
+    blackList(userId: number): void {
+        if (this.isBlackListed(userId)) return;
+        this.list.push(userId);
+        this.onBlockStream.next(userId);
+    }
+
+    cancelBlackList(userId: number): void {
+        this.list.splice(this.list.findIndex(data => data === userId), 1);
+        this.onUnBlockStream.next(userId);
+    }
+}
+
+export const blackListManager = new BlackListManager();