Firebase function for sending notification in flutter app.

gistfile1.txt

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.sendNotification = functions.https.onRequest((req, res) => {
    const to = req.query.to;
    const fromId = req.query.fromId;
    const fromPushId = req.query.fromPushId;
    const fromName = req.query.fromName;
    const fromMessage = req.query.fromMessage;
    const isApproved = req.query.isApproved;
    const type = req.query.type;

    var payload = {
        data: {
            click_action: "FLUTTER_NOTIFICATION_CLICK",
            fromId: fromId,
            fromPushId: fromPushId,
            fromName: fromName,
            type: type,
            isApproved: isApproved,
            fromMessage: fromMessage
        }
    };

    if (type === 'leave_request') {
        payload.notification = {
            title: 'Leave Request',
            body: `${fromName} has request for a leave!`
        };
    } else if (type === 'leave_approved') {
        payload.notification = {
            title: 'Leave Approved',
            body: `${fromName} has approved your leave!`
        };
    }

    var options = {
        priority: "high",
        timeToLive: 60 * 60 * 24
    };

    admin.messaging().sendToDevice(to, payload, options)
        .then(function (response) {
            return res.send(200, 'ok');
        })
        .catch(function (error) {
            res.send(200, 'failed');
        });
});