add UUID module (denoland/deno_std#479)

Original: https://github.com/denoland/deno_std/commit/f52b3ec002ac38aa9146695283aa491bc2d115b6

1 files changed, 19 insertions, 0 deletions

diff --git a/uuid/v4.ts b/uuid/v4.ts
new file mode 100644
index 000000000..eeb9c4f14
--- /dev/null
+++ b/uuid/v4.ts
@@ -0,0 +1,19 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+
+const UUID_RE = new RegExp(
+  "^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$",
+  "i"
+);
+
+export function validate(id: string): boolean {
+  return UUID_RE.test(id);
+}
+
+export default function generate(): string {
+  return "00000000-0000-4000-8000-000000000000".replace(
+    /[0]/g,
+    (): string =>
+      // random integer from 0 to 15 as a hex digit.
+      (crypto.getRandomValues(new Uint8Array(1))[0] % 16).toString(16)
+  );
+}