public static boolean isValidHostAndLength()

in java/src/main/java/com/twitter/twittertext/Extractor.java [384:411]

• 21 lines of code
• 5 McCabe index (conditional complexity)

  public static boolean isValidHostAndLength(int originalUrlLength, @Nullable String protocol,
                                             @Nullable String originalHost) {
    if (isEmptyString(originalHost)) {
      return false;
    }
    final int originalHostLength = originalHost.length();
    String host;
    try {
      // Use IDN for all host names, if the host is all ASCII, it returns unchanged.
      // It comes with an added benefit of checking host length to be between 1 and 63 characters.
      host = IDN.toASCII(originalHost, IDN.ALLOW_UNASSIGNED);
      // toASCII can throw IndexOutOfBoundsException when the domain name is longer than
      // 256 characters, instead of the documented IllegalArgumentException.
    } catch (IllegalArgumentException | IndexOutOfBoundsException e) {
      return false;
    }
    final int punycodeEncodedHostLength = host.length();
    if (punycodeEncodedHostLength == 0) {
      return false;
    }
    // The punycodeEncoded host length might be different now, offset that length from the URL.
    final int urlLength = originalUrlLength + punycodeEncodedHostLength - originalHostLength;
    // Add the protocol to our length check, if there isn't one,
    // to ensure it doesn't go over the limit.
    final int urlLengthWithProtocol =
        urlLength + (protocol == null ? URL_GROUP_PROTOCOL_LENGTH : 0);
    return urlLengthWithProtocol <= MAX_URL_LENGTH;
  }