utils.ts

import type { DialogSet } from "./types";

/**
 * Returns true, if input is a valid name of a dialogSet.
 * Intended to protect from loading anything other than dialogSet json.
 * @param input input to check
 */
function isValidDialogSetName(input: unknown) {
  if (typeof input !== "string") {
    return false;
  }
  if (input.length === 0) {
    return false;
  }
  if (input.length > 50) {
    return false;
  }
  return !/[^a-zA-Z0-9\-\_]/i.test(input);
}

function getHashValue(): string {
  return window.location.hash.substr(1);
}

/**
 * Fetch a dialogSet based on the hash value
 */
export async function fetchDialogSet(): Promise<DialogSet> {
  const setName = getHashValue();
  if (!isValidDialogSetName(setName))
    throw new Error("Name is not valid dialogSet name");

  const dialogSetUrl = "./dialogs/" + setName + ".json";

  try {
    const dialogSet: DialogSet = await (await fetch(dialogSetUrl)).json();
    return dialogSet;
  } catch (error) {
    throw error;
  }
}