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gaia/apps/network-alerts/js/index.js

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