zksync-sso/src/utils/helpers.ts

ZKsync Smart Sign On SDK

export function getWebsiteName(): string | null {
  const fullTitle = document.title;
  if (!fullTitle) return null;

  const delimiters = [" - ", " | ", " : ", " · ", " — "];

  // Find the first delimiter that splits the title
  for (const delimiter of delimiters) {
    const parts = fullTitle.split(delimiter);
    if (parts.length > 1) {
      return parts[0]!.trim();
    }
  }

  return fullTitle.trim();
}

export function getFavicon(): string | null {
  const el = document.querySelector(
    "link[sizes=\"192x192\"], link[sizes=\"180x180\"], link[rel=\"icon\"], link[rel=\"shortcut icon\"]",
  );
  const href = el?.getAttribute("href");
  if (!href) return null;

  try {
    const url = new URL(href, document.location.href);
    // Make sure no malicious URLs are returned like "javascript:..."
    if (url.protocol !== "https:" && url.protocol !== "http:") {
      return null;
    }
    return url.href;
  } catch {
    return null;
  }
}

export function noThrow<T>(fn: () => T): T | null {
  try {
    return fn();
  } catch {
    return null;
  }
}

export function findSmallestBigInt(arr: bigint[]): bigint {
  if (arr.length === 0) throw new Error("Array must not be empty");
  let smallest = arr[0];
  for (const num of arr) {
    if (num < smallest) smallest = num;
  }
  return smallest;
}

export function calculateMaxFee(fee: {
  gas?: bigint;
  gasPrice?: bigint;
  maxFeePerGas?: bigint;
  maxPriorityFeePerGas?: bigint;
}): bigint {
  if (!fee.gas) return 0n;

  if (fee.gasPrice) {
    return fee.gas * fee.gasPrice;
  } else if (fee.maxFeePerGas) {
    return fee.gas * fee.maxFeePerGas;
  } else if (fee.maxPriorityFeePerGas) {
    return fee.gas * fee.maxPriorityFeePerGas;
  }

  return 0n;
}