BMSPushServiceWorker.js

/*
    Copyright 2016-17 IBM Corp.
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at
        http://www.apache.org/licenses/LICENSE-2.0
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/
//import "bmsutils";

const regex = /{{\s*([^}]+)\s*}}/g;
var _pushVaribales = "";

function interpolate(messageData) {
    return function interpolate(o) {
        return messageData.replace(regex, function (a, b) {
            var r = o[b];
            return typeof r === 'string' || typeof r === 'number' ? r : a;
        });
    }
}

function createTemplateMessage(messageData) {
    if (Object.keys(_pushVaribales).length > 0 ) {
        var message = interpolate(messageData)(_pushVaribales);
        return message;
    } else {
        return messageData;
    }
}

function displayNotification(event) {
    var messageJson = event.data.json();
    var title = messageJson.title ? messageJson.title : "New message";
    var imageUrl = messageJson.iconUrl ? messageJson.iconUrl : "images/icon.png";
    var tagJson = messageJson.payload;
    var tag = tagJson.tag ? tagJson.tag : "";
    var bodyAlert = messageJson.alert ? messageJson.alert : "Example message"
    var payloadData = messageJson.payload ? messageJson.payload : "Example message"
    let messageTemp;
    if ((messageTemp = regex.exec(bodyAlert)) !== null) {
        bodyAlert = createTemplateMessage(bodyAlert);
    }
    self.registration.showNotification(title, {
        body: bodyAlert,
        icon: imageUrl,
        data: payloadData,
        tag: tag
    });  
    return Promise.resolve();
}


function triggerSeenEvent(strMsg) {
    send_message_to_all_clients("msgEventSeen:" + strMsg);
}

function triggerOpenEvent(strMsg) {
    send_message_to_all_clients("msgEventOpen:" + strMsg);
}

function onPushNotificationReceived(event) {
    console.log('Push notification received : ', event);
    if (event.data) {
        console.log('Event data is : ', event.data.text());
    }
    event.waitUntil(displayNotification(event).then(() => triggerSeenEvent(event.data.text())));
};

self.addEventListener('push', onPushNotificationReceived);

function send_message_to_client(client, msg) {
    return new Promise(function (resolve, reject) {
        var msg_chan = new MessageChannel();

        msg_chan.port1.onmessage = function (event) {
            if (event.data.error) {
                reject(event.data.error);
            } else {
                resolve(event.data);
            }
        };

        client.postMessage(msg, [msg_chan.port2]);
    });
}

function send_message_to_all_clients(msg) {
    clients.matchAll().then(clients => {
        clients.forEach(client => {
            send_message_to_client(client, msg);
        })
    });
}

self.addEventListener('install', function (event) {
    self.skipWaiting();
    console.log('Installed Service Worker : ', event);
    //event.postMessage("SW Says 'Hello back!'");
});

self.addEventListener('message', function (event) {
    replyPort = event.ports[0];
    _pushVaribales = event.data;
});

self.addEventListener('activate', function (event) {
    console.log('Activated Service Worker : ', event);
    event.waitUntil(self.clients.claim());
});

self.addEventListener('notificationclick', function (event) {
    console.log('Notification clicked with tag' + event.notification.tag + " and data " + event.notification.data);
    let nidjson = event.notification.data;
    event.notification.close();
    event.waitUntil(triggerOpenEvent(nidjson));
});

self.addEventListener('pushsubscriptionchange', function () {
    console.log('Push Subscription change');
    send_message_to_all_clients("updateRegistration:");
});