node-onvif/lib/modules/service-events.js

The node-onvif is a Node.js module which allows you to communicate with the network camera which supports the ONVIF specifications.

/* ------------------------------------------------------------------
* node-onvif - service-events.js
*
* Copyright (c) 2016 - 2017, Futomi Hatano, All rights reserved.
* Released under the MIT license
* Date: 2017-08-26
* ---------------------------------------------------------------- */
'use strict';
const mUrl    = require('url');
const mOnvifSoap = require('./soap.js');

/* ------------------------------------------------------------------
* Constructor: OnvifServiceEvents(params)
* - params:
*    - xaddr   : URL of the entry point for the media service
*                (Required)
*    - user  : User name (Optional)
*    - pass  : Password (Optional)
*    - time_diff: ms
* ---------------------------------------------------------------- */
function OnvifServiceEvents(params) {
	this.xaddr = '';
	this.user = '';
	this.pass = '';

	let err_msg = '';

	if(err_msg = mOnvifSoap.isInvalidValue(params, 'object')) {
		throw new Error('The value of "params" was invalid: ' + err_msg);
	}

	if('xaddr' in params) {
		if(err_msg = mOnvifSoap.isInvalidValue(params['xaddr'], 'string')) {
			throw new Error('The "xaddr" property was invalid: ' + err_msg);
		} else {
			this.xaddr = params['xaddr'];
		}
	} else {
		throw new Error('The "xaddr" property is required.');
	}

	if('user' in params) {
		if(err_msg = mOnvifSoap.isInvalidValue(params['user'], 'string', true)) {
			throw new Error('The "user" property was invalid: ' + err_msg);
		} else {
			this.user = params['user'] || '';
		}
	}

	if('pass' in params) {
		if(err_msg = mOnvifSoap.isInvalidValue(params['pass'], 'string', true)) {
			throw new Error('The "pass" property was invalid: ' + err_msg);
		} else {
			this.pass = params['pass'] || '';
		}
	}

	this.oxaddr = mUrl.parse(this.xaddr);
	if(this.user) {
		this.oxaddr.auth = this.user + ':' + this.pass;
	}

	this.time_diff = params['time_diff'];
	this.name_space_attr_list = [
		'xmlns:wsa="http://www.w3.org/2005/08/addressing"',
		'xmlns:tev="http://www.onvif.org/ver10/events/wsdl"'
	];
}

OnvifServiceEvents.prototype._createRequestSoap = function(body) {
	let soap = mOnvifSoap.createRequestSoap({
		'body': body,
		'xmlns': this.name_space_attr_list,
		'diff': this.time_diff,
		'user': this.user,
		'pass': this.pass
	});
	return soap;
};

/* ------------------------------------------------------------------
* Method: setAuth(user, pass)
* ---------------------------------------------------------------- */
OnvifServiceEvents.prototype.setAuth = function(user, pass) {
	this.user = user || '';
	this.pass = pass || '';
	if(this.user) {
		this.oxaddr.auth = this.user + ':' + this.pass;
	} else {
		this.oxaddr.auth = '';
	}
};

/* ------------------------------------------------------------------
* Method: getEventProperties([callback])
* ---------------------------------------------------------------- */
OnvifServiceEvents.prototype.getEventProperties = function(callback) {
	let promise = new Promise((resolve, reject) => {
		let soap_body = '';
		soap_body += '<tev:GetEventProperties/>';
		let soap = this._createRequestSoap(soap_body);
		mOnvifSoap.requestCommand(this.oxaddr, 'GetEventProperties', soap).then((result) => {
			resolve(result);
		}).catch((error) => {
			reject(error);
		});
	});
	if(callback) {
		promise.then((result) => {
			callback(null, result);
		}).catch((error) => {
			callback(error);
		});
	} else {
		return promise;
	}
};

module.exports = OnvifServiceEvents;