React Native - iOS subscription receipt verification (firebase) - reactjs

Question

currently I am working on a app but struggling to find since last two weeks the following:
I have react native iOS app with RN-iap for subscription.. and would like to implement receipt verification via cloud function at firebase.
I found a similar solution but its with SWIFT: https://www.loopwerk.io/articles/2020/storekit-webhooks-firestore/
can anybody please help me convert the code (swift below) into React Native ? really appreciate
or if any suitable example or lines please.
(I am using React native firebase).
I can able to fetch receipt and save in Firestore collection. Thanks in advance.
below are the codes:
FRONT END CALLING Cloud function
import Firebase
import FirebaseFunctions
import Foundation
final class CloudFunction {
private lazy var functions = Functions.functions()
func validateReceipt(receipt: String, completionHandler: #escaping () -> Void) {
let parameters = ["receipt": receipt]
functions.httpsCallable("validateReceipt").call(parameters) { _, error in
if let error = error {
print(error)
}
completionHandler()
}
}
}
Cloud Function for above:
const functions = require('firebase-functions');
const admin = require('firebase-admin');
const fetch = require('node-fetch');
const db = admin.firestore();
const runtimeOpts = {
memory: '1GB',
};
function validateAndStoreReceipt(url, options, userSnapshot) {
return fetch(url, options).then(result => {
return result.json();
}).then(data => {
if (data.status === 21007) {
// Retry with sandbox URL
return validateAndStoreReceipt('https://sandbox.itunes.apple.com/verifyReceipt', options, userSnapshot);
}
// Process the result
if (data.status !== 0) {
return false;
}
const latestReceiptInfo = data.latest_receipt_info[0];
const expireDate = +latestReceiptInfo.expires_date_ms;
const isSubscribed = expireDate > Date.now();
const status = {
isSubscribed: isSubscribed,
expireDate: expireDate,
};
const appleSubscription = {
receipt: data.latest_receipt,
productId: latestReceiptInfo.product_id,
originalTransactionId: latestReceiptInfo.original_transaction_id
};
// Update the user document!
return userSnapshot.ref.update({status: status, appleSubscription: appleSubscription});
});
}
exports.validateReceipt = functions.runWith(runtimeOpts).https.onCall(async (data, context) => {
if (!context.auth) {
throw new functions.https.HttpsError('permission-denied', 'The function must be called while authenticated.');
}
if (!data.receipt) {
throw new functions.https.HttpsError('permission-denied', 'receipt is required');
}
// First we fetch the user
const userSnapshot = await db.collection('users').doc(context.auth.uid).get();
if (!userSnapshot.exists) {
throw new functions.https.HttpsError('not-found', 'No user document found.');
}
// Now we fetch the receipt from Apple
let body = {
'receipt-data': data.receipt,
'password': 'MY_SECRET_PASSWORD',
'exclude-old-transactions': true
};
const options = {
method: 'post',
body: JSON.stringify(body),
headers: {'Content-Type': 'application/json'},
};
return validateAndStoreReceipt('https://buy.itunes.apple.com/verifyReceipt', options, userSnapshot);
});
continuation another cloud function:
const functions = require('firebase-functions');
const admin = require('firebase-admin');
const db = admin.firestore();
const runtimeOpts = {
memory: '1GB',
};
exports.appleWebhook = functions.runWith(runtimeOpts).https.onRequest(async (req, res) => {
// Only allow POST requests
if (req.method !== 'POST') {
return res.status(403).send('Forbidden');
}
// Check for correct password
if (req.body.password !== 'MY_SECRET_PASSWORD') {
return res.status(403).send('Forbidden');
}
const receipt = req.body.unified_receipt.latest_receipt_info[0];
// Find the user with this stored transaction id
const userQuerySnapshot = await db.collection('users')
.where('appleSubscription.originalTransactionId', '==', receipt.original_transaction_id)
.limit(1)
.get();
if (userQuerySnapshot.empty) {
throw new functions.https.HttpsError('not-found', 'No user found');
}
const expireDate = +receipt.expires_date_ms;
const isSubscribed = expireDate > Date.now();
const status = {
isSubscribed: isSubscribed,
expireDate: expireDate,
};
const appleSubscription = {
receipt: req.body.unified_receipt.latest_receipt,
productId: receipt.product_id,
originalTransactionId: receipt.original_transaction_id,
};
// Update the user
return userQuerySnapshot.docs[0].ref.update({ status: status, appleSubscription: appleSubscription }).then(function() {
return res.sendStatus(200);
});
});