Allow teacher to change user permissions (#28)

* Add permission function

* Update permission function

* format with prettier

---------

Co-authored-by: neda_moshki <uzijb@student.kit.edu>
Co-authored-by: Florian Raith <florianraith00@gmail.com>
Co-authored-by: Marius Friess <34072851+mariusfriess@users.noreply.github.com>

src/channel/channel.gateway.ts

@@ -105,6 +105,7 @@ export class ChannelGateway implements OnGatewayConnection {
       video: student.video,
       audio: student.audio,
       handSignal: student.handSignal,
+      permission: student.permission,
     }));
 
     return {
@@ -196,6 +197,23 @@ export class ChannelGateway implements OnGatewayConnection {
     return true;
   }
 
+  @SubscribeMessage('update-permission')
+  @UseRequestContext()
+  public async updatePermission(
+    @ConnectedSocket() client: Socket,
+    @MessageBody() payload: { studentId: string; permission: boolean },
+  ) {
+    const channel = await this.channels.fromClientOrFail(client);
+    channel.updatePermission(payload.studentId, payload.permission);
+
+    this.server.to(channel.id).emit('update-permission', {
+      id: payload.studentId,
+      permission: payload.permission,
+    });
+
+    return true;
+  }
+
   public async handleConnection(client: Socket) {
     /*
      * This is a workaround for getting the client's rooms in the disconnecting event.

src/channel/channel.ts

@@ -16,6 +16,7 @@ export interface Teacher extends ChannelUser {
 export interface Student extends ChannelUser {
   name: string;
   handSignal: boolean;
+  permission: boolean;
 }
 
 export class Channel {
@@ -39,6 +40,7 @@ export class Channel {
       video: true,
       audio: true,
       handSignal: false,
+      permission: false,
     };
     this.students.set(client.id, student);
 
@@ -143,6 +145,14 @@ export class Channel {
     }
   }
 
+  public updatePermission(studentId: string, permission: boolean) {
+    const student = this.getStudent(studentId);
+
+    if (student) {
+      student.permission = permission;
+    }
+  }
+
   public toString(): string {
     return `Channel{${this.id}}`;
   }