mirror of
https://github.com/jambonz/jambonz-feature-server.git
synced 2025-12-20 08:40:38 +00:00
102 lines
3.2 KiB
JavaScript
102 lines
3.2 KiB
JavaScript
const Task = require('./task');
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const {TaskName, TaskPreconditions} = require('../utils/constants');
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const {parseUri} = require('drachtio-srf');
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/**
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* sends a sip REFER to transfer the existing call
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*/
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class TaskSipRefer extends Task {
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constructor(logger, opts) {
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super(logger, opts);
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this.preconditions = TaskPreconditions.StableCall;
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this.referTo = this.data.referTo;
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this.referredBy = this.data.referredBy;
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this.headers = this.data.headers || {};
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this.eventHook = this.data.eventHook;
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}
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get name() { return TaskName.SipRefer; }
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async exec(cs) {
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super.exec(cs);
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const {dlg} = cs;
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const {referTo, referredBy} = this._normalizeReferHeaders(cs, dlg);
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try {
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this.notifyHandler = this._handleNotify.bind(this, cs, dlg);
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dlg.on('notify', this.notifyHandler);
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const response = await dlg.request({
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method: 'REFER',
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headers: {
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...this.headers,
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'Refer-To': referTo,
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'Referred-By': referredBy
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}
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});
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this.referStatus = response.status;
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this.logger.info(`TaskSipRefer:exec - received ${this.referStatus} to REFER`);
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/* if we fail, fall through to next verb. If success, we should get BYE from far end */
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if (this.referStatus === 202) {
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await this.awaitTaskDone();
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}
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else await this.performAction({refer_status: this.referStatus});
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} catch (err) {
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this.logger.info({err}, 'TaskSipRefer:exec - error sending REFER');
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}
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}
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async kill(cs) {
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super.kill(cs);
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const {dlg} = cs;
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dlg.off('notify', this.notifyHandler);
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}
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async _handleNotify(cs, dlg, req, res) {
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res.send(200);
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const contentType = req.get('Content-Type');
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this.logger.debug({body: req.body}, `TaskSipRefer:_handleNotify got ${contentType}`);
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if (contentType === 'message/sipfrag') {
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const arr = /SIP\/2\.0\s+(\d+)/.exec(req.body);
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if (arr) {
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const status = arr[1];
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this.logger.debug(`TaskSipRefer:_handleNotify: call got status ${status}`);
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if (this.eventHook) {
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await cs.requestor.request('verb:hook', this.eventHook, {event: 'transfer-status', call_status: status});
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}
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if (status >= 200) {
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await this.performAction({refer_status: 202, final_referred_call_status: status});
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this.notifyTaskDone();
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}
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}
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}
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}
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_normalizeReferHeaders(cs, dlg) {
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let {referTo, referredBy} = this;
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/* get IP address of the SBC to use as hostname if needed */
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const {host} = parseUri(dlg.remote.uri);
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if (!referTo.startsWith('<') && !referTo.startsWith('sip') && !referTo.startsWith('"')) {
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/* they may have only provided a phone number/user */
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referTo = `sip:${referTo}@${host}`;
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}
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if (!referredBy) {
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/* default */
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referredBy = cs.req?.callingNumber || dlg.local.uri;
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this.logger.info({referredBy}, 'setting referredby');
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}
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if (!referredBy.startsWith('<') && !referredBy.startsWith('sip') && !referredBy.startsWith('"')) {
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/* they may have only provided a phone number/user */
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referredBy = `sip:${referredBy}@${host}`;
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}
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return {referTo, referredBy};
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}
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}
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module.exports = TaskSipRefer;
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