b38dea0597
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110 lines
3 KiB
JavaScript
Executable file
110 lines
3 KiB
JavaScript
Executable file
'use strict';
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// See reference TS in following document for GSM and CDMA:
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// [1] GSM:
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// http://www.etsi.org/deliver/etsi_ts/123000_123099/123041/11.06.00_60/ts_123041v110600p.pdf
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//
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// [2] CDMA:
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// http://www.3gpp2.org/public_html/specs/C.R1001-G_v1.0_Param_Administration.pdf
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(function() {
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const CMAS_ID = 'emergency-alert-title',
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CMAS_ENABLED_KEY = 'cmas.enabled';
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// See GSM[1] section 9.4.1.2.2 Message Identifier and
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// CDMA[2] section 9.3.3 Commercial Mobile for thet presidential alerts
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const GSM_PRESIDENTIAL_ALERTS = [4370, 4383];
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const CDMA_PRESIDENTIAL_ALERT = 0x1000;
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window.navigator.mozSetMessageHandler(
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'cellbroadcast-received',
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onCellbroadcast
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);
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/**
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* Check if the id of the message in in CMAS specific range. Please ref link
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* above for GSM[1] and CDMA[2]
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*
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* @param {number} Message
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*/
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function isEmergencyAlert(message) {
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var messageId = message.messageId;
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var cdmaServiceCategory = message.cdmaServiceCategory;
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var isGSM = cdmaServiceCategory === null;
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if (isGSM) {
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return (messageId >= 4370 && messageId < 4400);
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} else {
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return (cdmaServiceCategory >= 0x1000 && cdmaServiceCategory <= 0x10FF);
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}
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}
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function isCmasEnabledForServiceId(serviceId) {
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var getPromise = navigator.mozSettings.createLock().get(CMAS_ENABLED_KEY);
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return getPromise.then(
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result => !!(result[CMAS_ENABLED_KEY][serviceId])
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);
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}
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function isPresidentialAlert(message) {
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var messageId = message.messageId;
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var cdmaServiceCategory = message.cdmaServiceCategory;
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var isGSM = cdmaServiceCategory === null;
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if (isGSM) {
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return GSM_PRESIDENTIAL_ALERTS.indexOf(messageId) !== -1;
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} else {
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return CDMA_PRESIDENTIAL_ALERT === cdmaServiceCategory;
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}
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}
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/**
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* Handling the cellbroadcast system message.
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* @param {Object} Cellbroadcast message object which contains necessary
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* information like Identifier and body for displaying attention screen.
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*/
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function onCellbroadcast(message) {
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if (!isEmergencyAlert(message)) {
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window.close();
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return;
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}
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var shouldSendAlertPromise =
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isPresidentialAlert(message) ?
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Promise.resolve(true) :
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isCmasEnabledForServiceId(message.serviceId).catch((e) => {
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console.error('CMAS: Unable to query settings database', e);
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return false;
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});
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return shouldSendAlertPromise.then((yes) => {
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if (yes) {
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sendAlert({
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title: CMAS_ID,
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body: message.body
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});
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// Do not close window here because it will close attention screen
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} else {
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window.close();
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}
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});
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}
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/**
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* Open CMAS alert attention screen with given message body content and
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* title.
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* @param {Object} Options object that contains the title l10n id and message
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* body.
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*/
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function sendAlert(opts) {
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var url = [
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'attention.html?title=',
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encodeURIComponent(opts.title),
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'&body=',
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encodeURIComponent(opts.body)
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].join('');
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window.open(url, '_blank', 'attention');
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}
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})();
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