android Firebase useful codes to get notification 2

Firebase useful codes to get notification

'user strict'



const functions = require('firebase-functions');

const admin=require('firebase-admin');

admin.initializeApp(functions.config().firebase);



exports.sendNotification=functions.database.ref('/notifications/{user_id}/{notification_id}').onWrite(event  => {

 const user_id = event.params.user_id;

 const notification_id = event.params.notification_id;



 console.log('We have a notification to send to ', user_id);



 if (!event.data.val()) {

 return console.log('ANotification has been deleted from db :',notification_id);

 }



 const fromUser=admin.database().ref(`/notifications/${user_id}/${notification_id}/`).once('value');

 

 return fromUser.then(fromUserResult => {



  const from_user_id=fromUserResult.val().from;



  console.log('You have a new notification from id :',from_user_id);



  const userQuery=admin.database().ref(`Users/${from_user_id}/`).once('value');



  return userQuery.then(userQueryResult => {



   const userName=userQueryResult.val().name;

   console.log('You have a new notification from  name :',userName);

   const deviceToken=admin.database().ref(`/Users/${user_id}/`).once('value');



    return deviceToken.then(result => {



    const token_id=result.val().device_token;

    console.log('ANotification OCCURED from token id :',token_id);

    

    const payLoad={

     notification:{

     title:"Friend Requset",

     body:`${userName} has sent you request`,

     icon:"default",

     click_action:"com.mamstricks.mypets.pets_TARGET_NOTIFICATION"

     },

     data: {

      from_user_id:from_user_id

     }

    };

    console.log('ANotification OCCURED from payload :',payLoad);

     

     return admin.messaging().sendToDevice(token_id,payLoad).then(response => {

     console.log('this was the notification features');

     }); 

    }); 

  });

});



});