First Release of Claw3D (#11)

Co-authored-by: iamlukethedev <iamlukethedev@users.noreply.github.com>

src/lib/uuid.ts

@@ -0,0 +1,43 @@
+type CryptoLike = {
+  randomUUID?: (() => string) | undefined;
+  getRandomValues?: ((array: Uint8Array) => Uint8Array) | undefined;
+};
+
+function uuidFromBytes(bytes: Uint8Array): string {
+  bytes[6] = (bytes[6] & 0x0f) | 0x40;
+  bytes[8] = (bytes[8] & 0x3f) | 0x80;
+
+  let hex = "";
+  for (let i = 0; i < bytes.length; i++) {
+    hex += bytes[i]!.toString(16).padStart(2, "0");
+  }
+
+  return `${hex.slice(0, 8)}-${hex.slice(8, 12)}-${hex.slice(12, 16)}-${hex.slice(
+    16,
+    20
+  )}-${hex.slice(20)}`;
+}
+
+function weakRandomBytes(): Uint8Array {
+  const bytes = new Uint8Array(16);
+  const now = Date.now();
+  for (let i = 0; i < bytes.length; i++) bytes[i] = Math.floor(Math.random() * 256);
+  bytes[0] ^= now & 0xff;
+  bytes[1] ^= (now >>> 8) & 0xff;
+  bytes[2] ^= (now >>> 16) & 0xff;
+  bytes[3] ^= (now >>> 24) & 0xff;
+  return bytes;
+}
+
+export function randomUUID(cryptoLike: CryptoLike | null | undefined = globalThis.crypto): string {
+  if (cryptoLike && typeof cryptoLike.randomUUID === "function") return cryptoLike.randomUUID();
+
+  if (cryptoLike && typeof cryptoLike.getRandomValues === "function") {
+    const bytes = new Uint8Array(16);
+    cryptoLike.getRandomValues(bytes);
+    return uuidFromBytes(bytes);
+  }
+
+  return uuidFromBytes(weakRandomBytes());
+}
+