From d340447aba098dbac6163bfbacca0429323e6e45 Mon Sep 17 00:00:00 2001
From: Derrick Hammer <derrick@derrickhammer.com>
Date: Fri, 23 Jun 2023 03:28:39 -0400
Subject: [PATCH] feat: add portal management apis

---
 src/portal.ts | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++
 src/types.ts  |  5 ++++
 2 files changed, 83 insertions(+)
 create mode 100644 src/portal.ts

diff --git a/src/portal.ts b/src/portal.ts
new file mode 100644
index 0000000..1219014
--- /dev/null
+++ b/src/portal.ts
@@ -0,0 +1,78 @@
+import { ErrTuple, KeyPair, Portal } from "#types.js";
+import { Client } from "@lumeweb/libportal";
+import { deriveChildKey } from "#keys.js";
+import { ed25519 } from "@noble/curves/ed25519";
+import { bytesToHex } from "@noble/hashes/utils.js";
+
+let activePortalMasterKey;
+
+export const DEFAULT_PORTAL_LIST: Portal[] = [
+  { id: "lumeweb", url: "https://web3portal.com", name: "web3portal.com" },
+];
+
+const ACTIVE_PORTALS = new Set<Client>();
+
+type PortalSessionsStore = { [id: string]: string };
+
+export function maybeInitDefaultPortals(): ErrTuple {
+  if (!activePortalMasterKey) {
+    return [null, "activePortalMasterKey not set"];
+  }
+
+  let portalSessionsData = window.localStorage.getItem("portals");
+  let portalSessions: PortalSessionsStore = {};
+  if (portalSessions) {
+    portalSessions = JSON.parse(
+      portalSessionsData as string,
+    ) as PortalSessionsStore;
+  }
+
+  for (const portal of DEFAULT_PORTAL_LIST) {
+    let jwt: string | null = null;
+
+    if (portalSessions) {
+      if (portal.id in portalSessions) {
+        jwt = portalSessions[portal.id];
+      }
+    }
+
+    const client = new Client({
+      email: generatePortalEmail(portal),
+      portalUrl: portal.url,
+      privateKey: generatePortalKeyPair(portal).privateKey,
+      jwt: jwt as string,
+    });
+
+    ACTIVE_PORTALS.add(client);
+  }
+
+  return [null, null];
+}
+
+export function setActivePortalMasterKey(key: Uint8Array) {
+  activePortalMasterKey = key;
+}
+
+export function generatePortalEmail(portal: Portal) {
+  const keyPair = generatePortalKeyPair(portal);
+
+  const userId = bytesToHex(keyPair.publicKey.slice(0, 12));
+
+  return `${userId}@example.com`;
+}
+
+export function generatePortalKeyPair(portal: Portal): KeyPair {
+  const privateKey = deriveChildKey(
+    activePortalMasterKey,
+    `portal-account:${portal.id}`,
+  );
+
+  return {
+    privateKey,
+    publicKey: ed25519.getPublicKey(privateKey),
+  };
+}
+
+export function getActivePortals(): Set<Client> {
+  return ACTIVE_PORTALS;
+}
diff --git a/src/types.ts b/src/types.ts
index 33b1e23..7d4958e 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -71,6 +71,11 @@ interface RequestOverrideResponse {
   body?: Uint8Array;
 }
 
+export interface KeyPair {
+  publicKey: Uint8Array;
+  privateKey: Uint8Array;
+}
+
 export {
   DataFn,
   ErrFn,