1 files changed, 36 insertions, 0 deletions
diff --git a/sdc-workflow-designer-ui/src/app/paletx/core/uuid.ts b/sdc-workflow-designer-ui/src/app/paletx/core/uuid.ts
new file mode 100644
index 00000000..58756b63
--- /dev/null
+++ b/sdc-workflow-designer-ui/src/app/paletx/core/uuid.ts
@@ -0,0 +1,36 @@
+/* tslint:disable:array-type member-access variable-name */
+export class UUID {
+  constructor() {
+      //
+  }
+
+  static UUID(): string {
+	if (typeof(window.crypto) !== 'undefined' &&
+		typeof(window.crypto.getRandomValues) !== 'undefined') {
+      // If we have a cryptographically secure PRNG, use that
+		let buf: Uint16Array = new Uint16Array(8);
+		window.crypto.getRandomValues(buf);
+		return (
+			this.pad4(buf[0]) + this.pad4(buf[1]) + '-' + this.pad4(buf[2]) +
+			'-' + this.pad4(buf[3]) + '-' + this.pad4(buf[4]) + '-' +
+			this.pad4(buf[5]) + this.pad4(buf[6]) + this.pad4(buf[7]));
+	} else {
+      // Otherwise, just use Math.random
+		return this.random4() + this.random4() + '-' + this.random4() + '-' +
+			this.random4() + '-' + this.random4() + '-' + this.random4() +
+			this.random4() + this.random4();
+	}
+  }
+
+  private static pad4(num: number): string {
+	let ret: string = num.toString(16);
+	while (ret.length < 4) {
+		ret = '0' + ret;
+	}
+	return ret;
+  }
+
+  private static random4(): string {
+	return Math.floor((1 + Math.random()) * 0x10000).toString(16).substring(1);
+  }
+}