jssip/lib/RTCSession/ReferNotifier.js

The Javascript SIP library

"use strict";
const Logger = require('../Logger');
const JsSIP_C = require('../Constants');
const logger = new Logger('RTCSession:ReferNotifier');
const C = {
    event_type: 'refer',
    body_type: 'message/sipfrag;version=2.0',
    expires: 300,
};
module.exports = class ReferNotifier {
    constructor(session, id, expires) {
        this._session = session;
        this._id = id;
        this._expires = expires || C.expires;
        this._active = true;
        // The creation of a Notifier results in an immediate NOTIFY.
        this.notify(100);
    }
    notify(code, reason) {
        logger.debug('notify()');
        if (this._active === false) {
            return;
        }
        reason = reason || JsSIP_C.REASON_PHRASE[code] || '';
        let state;
        if (code >= 200) {
            state = 'terminated;reason=noresource';
        }
        else {
            state = `active;expires=${this._expires}`;
        }
        // Put this in a try/catch block.
        this._session.sendRequest(JsSIP_C.NOTIFY, {
            extraHeaders: [
                `Event: ${C.event_type};id=${this._id}`,
                `Subscription-State: ${state}`,
                `Content-Type: ${C.body_type}`,
            ],
            body: `SIP/2.0 ${code} ${reason}`,
            eventHandlers: {
                // If a negative response is received, subscription is canceled.
                onErrorResponse() {
                    this._active = false;
                },
            },
        });
    }
};