landscape-template/api/functions/nostr-confirm-event/nostr-confirm-event.js

const serverless = require('serverless-http');
const { createExpressApp } = require('../../modules');
const express = require('express');
const extractKeyFromCookie = require('../../utils/extractKeyFromCookie');
const { getUserByPubKey } = require('../../auth/utils/helperFuncs');
const { verifySignature, validateEvent } = require('../../utils/nostr-tools');
const { prisma } = require('../../prisma');


const signEvent = async (req, res) => {
    try {
        const userPubKey = await extractKeyFromCookie(req.headers.cookie ?? req.headers.Cookie)
        const user = await getUserByPubKey(userPubKey);

        if (!user)
            return res.status(401).json({ status: 'ERROR', reason: 'Not Authenticated' });

        const pubkey = user.nostr_pub_key;

        const event = req.body.event

        if (!validateEvent(event))
            return res.status(400).send("Event not valid");

        if (event.pubkey !== pubkey || !(await verifySignature(event)))
            return res.status(400).send("Signature not valid")



        // Extract type & id
        const rTag = event.tags.find(tag => tag[0] === 'r');
        const [host, type, refId] = rTag[1].split(' ');

        if (host !== 'boltfun') return res.status(400).send("This event wasn't signed by bolt.fun");


        if (type === 'Story_comment') {

            // Extract replyTo id
            const eTag = event.tags.find(tag => tag[0] === 'e');
            let parent_comment_id;
            if (eTag) {
                const [parent_nostr_comment_id] = eTag[1].split(' ');
                if (parent_nostr_comment_id)
                    parent_comment_id = (await prisma.postComment.findFirst({
                        where: {
                            nostr_id: parent_nostr_comment_id
                        }
                    }))?.id;
            }


            // Insert comment in database
            await prisma.postComment.create({
                data: {
                    nostr_id: event.id,
                    body: event.content,
                    story_id: Number(refId),
                    user_id: user.id,
                    parent_comment_id
                },

            })


        }


        return res
            .status(200)
            .end()
    } catch (error) {
        console.log(error);
        res.status(500).send("Unexpected error happened, please try again")
    }

}


let app;

if (process.env.LOCAL) {
    app = createExpressApp()
    app.post('/nostr-confirm-event', signEvent);
}
else {
    const router = express.Router();
    router.post('/nostr-confirm-event', signEvent)
    app = createExpressApp(router)
}


const handler = serverless(app);
exports.handler = async (event, context) => {
    return await handler(event, context);
};