Cloud function: common class.

index.ts

"use strict";
import functions = require("firebase-functions");
import admin = require("firebase-admin");
import * as rcFunctions from './RemoteConfigFunctions';
import { RemoteConfigObj } from "./RemoteConfigObj";
import * as secretProps from '../SecretProperties';
const request = require('request');
const STATUS_CODE_OK = 200
Object.defineProperty(exports, "__esModule", { value: true });
admin.initializeApp({
    credential: admin.credential.cert(secretProps.service),
    databaseURL: secretProps.DB_URL
});
exports.showConfigDiff = functions.remoteConfig.onUpdate(async (param) => {
// Here is a payload for the future notification.
    const payload = {
        notification: {
            title: 'New updates',
            body: 'We have updated our app remote config.'
        },
// Also I have here some specific data for the remote config only, 
// by which I can easily discern the basic notification from the 
//remote config notification.
        data: {
            "rc_extra_back_notification": "true"
        }
    };
rcFunctions.getAccessToken(secretProps.service).then(token => {
//After a successful token request, we will compose 
//the options for the future request.
        const options = {
            uri: secretProps.FB_URL_RC,
            method: 'GET',
            gzip: true,
            resolveWithFullResponse: true,
            headers: {
                'Authorization': 'Bearer ' + token,
                'Accept-Encoding': 'gzip',
            }
        };
// Here we will run the request on remote config.
// As a response we will have: error, response: { statusCode } and body.
        request(options, function (error: any, response: { statusCode: any; },
        body: any) {
            console.log('statusCode:', response && response.statusCode);
            if (response.statusCode === STATUS_CODE_OK) {
                console.log('body:', body);
                const obj: RemoteConfigObj = JSON.parse(body);
                const platformSettings =
                JSON.parse(obj.parameters.platform_setting.defaultValue.value);
                if (platformSettings !== null) {
                    console.log("platformSettings: " + platformSettings.isItDev + "," + platformSettings.isPushAvailable + ", " + platformSettings.platform);
                    const topic = rcFunctions.choosePushTopics(platformSettings)
                    console.log("topic: " + topic.length);
                    if (topic.length !== 0) {
                        topic.forEach(async (top) => {
                            console.log("Topic: " + top);
// And finally, we will send the notifications to our topic/s.
                            const resp = 
                            await admin.messaging().sendToTopic(top, payload);
                            console.log(resp);
                        })
                    }
                }
            } else console.error('error:', error);
        });
    }).catch(er => console.error('error:', er))
});