feat: more work on the commenting system

api/utils/nostr-tools.js

@@ -0,0 +1,45 @@
+// import * as secp256k1 from '@noble/secp256k1'
+// import { Buffer } from 'buffer'
+const secp256k1 = require('@noble/secp256k1');
+const crypto = require('crypto')
+
+function generatePrivateKey() {
+    return Buffer.from(secp256k1.utils.randomPrivateKey()).toString('hex')
+}
+
+function getPublicKey(privateKey) {
+    return Buffer.from(secp256k1.schnorr.getPublicKey(privateKey)).toString('hex')
+}
+
+
+function serializeEvent(evt) {
+    return JSON.stringify([
+        0,
+        evt.pubkey,
+        evt.created_at,
+        evt.kind,
+        evt.tags,
+        evt.content
+    ])
+}
+
+
+function getEventHash(event) {
+    let eventHash = crypto.createHash('sha256')
+        .update(Buffer.from(serializeEvent(event)))
+        .digest()
+    return Buffer.from(eventHash).toString('hex')
+}
+
+
+async function signEvent(event, key) {
+    return Buffer.from(
+        await secp256k1.schnorr.sign(getEventHash(event), key)
+    ).toString('hex')
+}
+
+module.exports = {
+    generatePrivateKey,
+    getPublicKey,
+    signEvent,
+}