first v3

packages/shared/src/api.ts

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+import { encode, decode } from "@msgpack/msgpack";
+
+import type { ServerNote } from "./types.js";
+
+let server = "";
+
+export function setServer(url: string) {
+  server = url.replace(/\/+$/, "");
+}
+
+export function getServer() {
+  return server;
+}
+
+function api(path: string) {
+  return `${server}/api/v3/${path}`;
+}
+
+export async function create(note: ServerNote): Promise<{ id: string }> {
+  const res = await fetch(api("notes"), {
+    method: "POST",
+    headers: { "content-type": "application/msgpack" },
+    body: encode(note),
+  });
+  if (!res.ok) throw new Error("create failed");
+  const buf = await res.arrayBuffer();
+  const data = decode(new Uint8Array(buf)) as any;
+  if (typeof data?.id !== "string") throw new Error("invalid response");
+  return { id: data.id };
+}
+
+export async function info(id: string): Promise<ServerNote["meta"] | null> {
+  const res = await fetch(api(`notes/${id}`));
+  if (!res.ok) return null;
+  const buf = await res.arrayBuffer();
+  const data = decode(new Uint8Array(buf)) as any;
+  const meta = data?.meta as ServerNote["meta"] | undefined;
+  if (!meta) return null;
+  if (meta.extra && !(meta.extra instanceof Uint8Array)) meta.extra = new Uint8Array(meta.extra as any);
+  return meta;
+}
+
+export async function get(id: string): Promise<ServerNote | null> {
+  const res = await fetch(api(`notes/${id}`), { method: "DELETE" });
+  if (!res.ok) return null;
+  const buf = await res.arrayBuffer();
+  const data = decode(new Uint8Array(buf)) as any;
+  const meta = data.meta as ServerNote["meta"];
+  if (meta?.extra && !(meta.extra instanceof Uint8Array)) meta.extra = new Uint8Array(meta.extra as any);
+  const d = data.data;
+  return { meta, data: d instanceof Uint8Array ? d : new Uint8Array(d) } satisfies ServerNote;
+}
+
+export async function status(): Promise<Record<string, unknown>> {
+  const res = await fetch(api("status"));
+  if (!res.ok) throw new Error("status failed");
+  return res.json();
+}

packages/shared/src/crypto.test.ts

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+import { describe, expect, it } from "vitest";
+import { deriveKey, encrypt, decrypt, generateKey, utf8ToBytes, randomBytes } from "./crypto";
+
+describe("crypto", () => {
+  it("encrypts and decrypts with generated key", () => {
+    const data = utf8ToBytes("hello world");
+    const key = generateKey();
+    const enc = encrypt(data, key);
+    const dec = decrypt(enc, key);
+    expect(dec).toEqual(data);
+  });
+
+  it("encrypts and decrypts with derived key", () => {
+    const data = utf8ToBytes("secret message");
+    const salt = randomBytes(16);
+    const key = deriveKey("password123", salt);
+    const enc = encrypt(data, key);
+    const dec = decrypt(enc, key);
+    expect(dec).toEqual(data);
+  });
+
+  it("derived key has same length as generated", () => {
+    const salt = randomBytes(16);
+    expect(deriveKey("test", salt).length).toBe(generateKey().length);
+  });
+});

packages/shared/src/crypto.ts

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+import { xchacha20poly1305 } from "@noble/ciphers/chacha.js";
+import { managedNonce, randomBytes, utf8ToBytes } from "@noble/ciphers/utils.js";
+import { scrypt } from "@noble/hashes/scrypt.js";
+
+export { bytesToUtf8, utf8ToBytes } from "@noble/ciphers/utils.js";
+export { randomBytes } from "@noble/ciphers/utils.js";
+
+const N = 2 ** 15;
+const KEY_SIZE = 32;
+
+export function generateKey(): Uint8Array {
+  return randomBytes(KEY_SIZE);
+}
+
+export function deriveKey(password: string, salt: Uint8Array): Uint8Array {
+  return scrypt(password, salt, { N, r: 8, p: 1, dkLen: KEY_SIZE });
+}
+
+export function encrypt(data: Uint8Array, key: Uint8Array): Uint8Array {
+  const chacha = managedNonce(xchacha20poly1305)(key);
+  return chacha.encrypt(data);
+}
+
+export function decrypt(data: Uint8Array, key: Uint8Array): Uint8Array {
+  const chacha = managedNonce(xchacha20poly1305)(key);
+  return chacha.decrypt(data);
+}
+
+export function bytesToHex(bytes: Uint8Array): string {
+  return Array.from(bytes)
+    .map((b) => b.toString(16).padStart(2, "0"))
+    .join("");
+}
+
+export function hexToBytes(hex: string): Uint8Array {
+  const bytes = new Uint8Array(hex.length / 2);
+  for (let i = 0; i < bytes.length; i++) {
+    bytes[i] = Number.parseInt(hex.slice(i * 2, i * 2 + 2), 16);
+  }
+  return bytes;
+}

packages/shared/src/index.ts

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+export * from "./crypto.js";
+export * from "./types.js";
+export * from "./api.js";
+export { encode, decode } from "@msgpack/msgpack";

packages/shared/src/types.ts

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+export type NoteMeta = {
+  expiration?: number;
+  views?: number;
+  extra?: Uint8Array;
+};
+
+export type ServerNote = {
+  meta: NoteMeta;
+  data: Uint8Array;
+};
+
+export type NoteContent =
+  | { type: "text"; data: string }
+  | { type: "files"; data: FileDTO[] };
+
+export type FileDTO = {
+  name: string;
+  mime: string;
+  size: number;
+  data: Uint8Array;
+};