1 files changed, 33 insertions, 0 deletions
diff --git a/std/uuid/v4.ts b/std/uuid/v4.ts
new file mode 100644
index 000000000..511933439
--- /dev/null
+++ b/std/uuid/v4.ts
@@ -0,0 +1,33 @@
+// 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 {
+  const rnds = crypto.getRandomValues(new Uint8Array(16));
+
+  rnds[6] = (rnds[6] & 0x0f) | 0x40; // Version 4
+  rnds[8] = (rnds[8] & 0x3f) | 0x80; // Variant 10
+
+  const bits: string[] = [...rnds].map((bit): string => {
+    const s: string = bit.toString(16);
+    return bit < 0x10 ? "0" + s : s;
+  });
+  return [
+    ...bits.slice(0, 4),
+    "-",
+    ...bits.slice(4, 6),
+    "-",
+    ...bits.slice(6, 8),
+    "-",
+    ...bits.slice(8, 10),
+    "-",
+    ...bits.slice(10)
+  ].join("");
+}