feat: add shared typescript utility methods, and stores for ui layer

shared/keys.ts

@@ -0,0 +1,46 @@
+import { x25519 } from "@noble/curves/ed25519";
+import {
+  getCommunicationKey,
+  getRemoteCommunicationKey,
+  setCommunicationKey,
+  setRemoteCommunicationKey,
+} from "./vars.js";
+import { queryBackground } from "./util.js";
+import { bytesToHex, hexToBytes, randomBytes } from "@lumeweb/libweb";
+import { secretbox } from "@noble/ciphers/salsa";
+
+export function generateCommunicationKey() {
+  return x25519.utils.randomPrivateKey();
+}
+
+export async function exchangeCommunicationKeys() {
+  if (!getCommunicationKey()) {
+    setCommunicationKey(generateCommunicationKey());
+  }
+
+  const pubKey = await queryBackground(
+    "exchangeCommunicationKeys",
+    bytesToHex(x25519.getPublicKey(getCommunicationKey())),
+  );
+
+  if (!pubKey) {
+    throw new Error("could not get communication key");
+  }
+
+  setRemoteCommunicationKey(hexToBytes(pubKey));
+}
+
+export async function setLoginKey(key: Uint8Array) {
+  const privKey = getCommunicationKey();
+  const pubKey = getRemoteCommunicationKey();
+
+  const secret = x25519.getSharedSecret(privKey, pubKey);
+  const nonce = randomBytes(24);
+  const box = secretbox(secret, nonce);
+  const ciphertext = box.seal(key);
+
+  await queryBackground("setLoginKey", {
+    data: bytesToHex(ciphertext),
+    nonce: bytesToHex(nonce),
+  });
+}

shared/util.ts

@@ -0,0 +1,29 @@
+import browser from "webextension-polyfill";
+
+import { createClient } from "@lumeweb/kernel-swarm-client";
+
+let swarmClient = createClient();
+
+export async function queryBackground(method: string, data = {}) {
+  let resp;
+  try {
+    resp = await browser.runtime.sendMessage({
+      method,
+      data,
+    });
+  } catch (e) {
+    throw e;
+  }
+
+  return resp;
+}
+
+export async function waitForBoot() {
+  await queryBackground("waitForBoot");
+}
+
+export async function waitForConnected(cb?: Function) {
+  await waitForBoot();
+  await swarmClient.ready();
+  await cb?.();
+}

shared/vars.ts

@@ -0,0 +1,17 @@
+let communicationKey: Uint8Array;
+let remoteCommunicationKey: Uint8Array;
+
+export function setCommunicationKey(key: Uint8Array) {
+  communicationKey = key;
+}
+
+export function getCommunicationKey() {
+  return communicationKey;
+}
+export function setRemoteCommunicationKey(key: Uint8Array) {
+  remoteCommunicationKey = key;
+}
+
+export function getRemoteCommunicationKey() {
+  return remoteCommunicationKey;
+}