From b077271d465a7e674fefb0e549aa09d6c9adf2b1 Mon Sep 17 00:00:00 2001
From: fiatjaf <fiatjaf@alhur.es>
Date: Mon, 4 Jan 2021 14:15:27 -0300
Subject: [PATCH] initial commit.

---
 .gitignore   |  1 +
 event.js     | 39 +++++++++++++++++++++++++++++++++++++++
 index.js     |  4 ++++
 package.json | 13 +++++++++++++
 relay.js     | 27 +++++++++++++++++++++++++++
 schnorr.js   | 10 ++++++++++
 utils.js     |  5 +++++
 7 files changed, 99 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 event.js
 create mode 100644 index.js
 create mode 100644 package.json
 create mode 100644 relay.js
 create mode 100644 schnorr.js
 create mode 100644 utils.js

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3c3629e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+node_modules
diff --git a/event.js b/event.js
new file mode 100644
index 0000000..c866703
--- /dev/null
+++ b/event.js
@@ -0,0 +1,39 @@
+import shajs from 'sha.js'
+import BigInteger from 'bigi'
+import schnorr from 'bip-schnorr'
+
+export function serializeEvent(evt) {
+  return JSON.stringify([
+    0,
+    evt.pubkey,
+    evt.created_at,
+    evt.kind,
+    evt.tags,
+    evt.content
+  ])
+}
+
+export function getEventID(event) {
+  let hash = shajs('sha256').update(serializeEvent(event)).digest()
+  return hash.toString('hex')
+}
+
+export function verifySignature(event) {
+  try {
+    schnorr.verify(
+      Buffer.from(event.pubkey, 'hex'),
+      Buffer.from(getEventID(event), 'hex'),
+      Buffer.from(event.sig, 'hex')
+    )
+    return true
+  } catch (err) {
+    return false
+  }
+}
+
+export function signEvent(event, key) {
+  let eventHash = shajs('sha256').update(serializeEvent(event)).digest()
+  schnorr
+    .sign(new BigInteger(key, 16), eventHash, makeRandom32())
+    .toString('hex')
+}
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..63c9c4f
--- /dev/null
+++ b/index.js
@@ -0,0 +1,4 @@
+export {relayConnect} from './relay'
+export {signEvent, verifySignature, serializeEvent, getEventID} from './event'
+export {pubkeyFromPrivate} from './schnorr'
+export {makeRandom32} from './utils'
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..3eeef7d
--- /dev/null
+++ b/package.json
@@ -0,0 +1,13 @@
+{
+  "name": "nostr-tools",
+  "version": "0.0.1",
+  "dependencies": {
+    "assert": "^2.0.0",
+    "bigi": "^1.4.2",
+    "bip-schnorr": "^0.6.2",
+    "buffer": "^6.0.3",
+    "ecurve": "^1.0.6",
+    "pws": "^5.0.2",
+    "sha.js": "^2.4.11"
+  }
+}
diff --git a/relay.js b/relay.js
new file mode 100644
index 0000000..5dd20fe
--- /dev/null
+++ b/relay.js
@@ -0,0 +1,27 @@
+import PersistentWebSocket from 'pws'
+
+export function relayConnect(url, onEventCallback) {
+  if (url.length && url[url.length - 1] === '/') url = url.slice(0, -1)
+
+  const ws = new PersistentWebSocket(url + '/ws?session=' + Math.random(), {
+    pingTimeout: 30 * 1000
+  })
+
+  ws.onopen = () => console.log('connected to ', url)
+  ws.onerror = err => console.log('error connecting', url, err)
+
+  ws.onmessage = e => {
+    let event = JSON.parse(e.data)
+    event.context
+  }
+
+  return {
+    url,
+    subscribe() {},
+    request() {},
+    publish() {},
+    close() {
+      ws.close()
+    }
+  }
+}
diff --git a/schnorr.js b/schnorr.js
new file mode 100644
index 0000000..a233171
--- /dev/null
+++ b/schnorr.js
@@ -0,0 +1,10 @@
+import BigInteger from 'bigi'
+import ecurve from 'ecurve'
+
+const curve = ecurve.getCurveByName('secp256k1')
+const G = curve.G
+
+export function pubkeyFromPrivate(privateHex) {
+  const privKey = BigInteger.fromHex(privateHex)
+  return G.multiply(privKey).getEncoded(true).slice(1).toString('hex')
+}
diff --git a/utils.js b/utils.js
new file mode 100644
index 0000000..8046146
--- /dev/null
+++ b/utils.js
@@ -0,0 +1,5 @@
+export function makeRandom32() {
+  var array = new Uint32Array(32)
+  window.crypto.getRandomValues(array)
+  return Buffer.from(array)
+}