comunicapiv2/src/entities/WebSocketRequestHandler.ts

/**
 * User Web Sockets requests handler implementation
 * 
 * @author Pierre Hubert
 */

import { BaseRequestsHandler } from "./BaseRequestsHandler";
import { ActiveClient, UserWebSocketController } from "../controllers/UserWebSocketController";
import { WsMessage } from "./WsMessage";

export class UserWebSocketRequestsHandler extends BaseRequestsHandler {

	private sentResponse = false;

	constructor(public wsClient: ActiveClient, private req: WsMessage) {
		super();
	}

	public get isResponseSent() : boolean {
		return this.sentResponse;
	}
	
	protected get userID(): number {
		return this.wsClient.userID;
	}


	protected getPostParam(name: string) {
		return this.req.data[name];
	}

	public hasPostParameter(name: string): boolean {
		return this.req.data.hasOwnProperty(name)
			&& this.req.data[name] != null
			&& this.req.data[name] != undefined;
	}

	public error(code: number, message: string): void {
		this.sendResponse("error", {
			code: code,
			message: message
		});
		throw new Error("User WS error ("+code+"): "+message);
	}

	public success(message: string = ""): void {
		this.sendResponse("success", message);
	}

	public send(data: any): void {
		this.sendResponse("success", data);
	}

	public sendResponse(title: string, data: any) {
		if(this.sentResponse)
			throw new Error("Trying to send a response to a request to which a response has already been sent!")
		
		// Send the response
		UserWebSocketController.SendToClient(this.wsClient, new WsMessage({
			title: title,
			data: data,
			id: this.req.id
		}))

		this.sentResponse = true;
	}


	/**
	 * Get the ID of a call included in WebSocket request
	 * 
	 * @param name The name of the parameter
	 */
	public postCallId(name: string) : number {
		const convID = this.postInt(name);

		// Check if the user is a member of this call
		if(!this.wsClient.activeCalls.has(convID))
			this.error(401, "You do not belong to this call!")
		
		return convID;
	}

	/**
	 * Get the ID of a peer of a call included in the WebSocket request
	 * 
	 * @param callID Target call ID
	 * @param name The name of the POST field
	 */
	public postCallPeerID(callID: number, name: string) : number{
		const peerID = this.postInt(name);

		if(peerID != this.getUserId() && UserWebSocketController.active_clients.find(
			(e) => e.userID == peerID && e.activeCalls.has(callID)) === undefined)
			this.error(401, "This peer is not a member of the call!");
		
		return peerID;
	}
}