VirtWeb/virtweb_frontend/src/widgets/forms/MACInput.tsx

/* eslint-disable @typescript-eslint/no-unnecessary-condition */
import { TextInput } from "./TextInput";

export function MACInput(p: {
  label: string;
  editable: boolean;
  value?: string;
  onValueChange?: (newVal: string | undefined) => void;
}): React.ReactElement {
  const { onValueChange, ...props } = p;
  return (
    <TextInput
      onValueChange={(v) => {
        onValueChange?.(sanitizeMacAddress(v));
      }}
      {...props}
    />
  );
}

function sanitizeMacAddress(s: string | undefined): string | undefined {
  if (s === "" || s === undefined) return s;

  const split = s.split(":");
  if (split.length > 6) split.splice(6);

  let needAnotherIteration = false;

  const res = split
    .map((e) => {
      if (e === "") return e;

      const num = parseInt(e, 16);
      if (isNaN(num)) return "0";

      const s = num.toString(16).padStart(2, "0");
      if (num > 0xff) {
        needAnotherIteration = true;
        return s.slice(0, 2) + ":" + s.slice(2);
      }

      return s;
    })
    .join(":");

  return needAnotherIteration ? sanitizeMacAddress(res) : res;
}