public static URL from()

in webindex/modules/core/src/main/java/webindex/core/models/URL.java [84:150]
59 lines of code
11 McCabe index (conditional complexity)

  public static URL from(String rawUrl, Function<String, String> domainFromHost,
      Function<String, Boolean> isValidHost) {

    if (rawUrl.contains(URI_SEP)) {
      badUrl(false, "Skipping raw URL as it contains '" + URI_SEP + "':" + rawUrl);
    }

    String trimUrl = rawUrl.trim();
    if (trimUrl.length() < 8) {
      badUrl(false, "Raw URL is too short to start with valid protocol: " + rawUrl);
    }

    String urlNoProto = "";
    boolean secure = false;
    int port = 80;
    if (trimUrl.substring(0, 7).equalsIgnoreCase(HTTP_PROTO)) {
      urlNoProto = trimUrl.substring(7);
    } else if (trimUrl.substring(0, 8).equalsIgnoreCase(HTTPS_PROTO)) {
      urlNoProto = trimUrl.substring(8);
      secure = true;
      port = 443;
    } else {
      badUrl(false, "Raw URL does not start with valid protocol: " + rawUrl);
    }

    String hostPort;
    String[] args = urlNoProto.split(URL_SEP_REGEX, 2);
    String path;
    String sep;
    if (args.length == 2) {
      hostPort = args[0].toLowerCase();
      int sepIndex = args[0].length();
      sep = urlNoProto.substring(sepIndex, sepIndex + 1);
      path = sep + args[1];
    } else {
      hostPort = urlNoProto.toLowerCase();
      path = "/";
    }

    args = hostPort.split(":", 2);
    String host;
    if (args.length == 2) {
      host = args[0];
      try {
        port = Integer.parseInt(args[1]);
      } catch (NumberFormatException e) {
        badUrl(false, "Raw URL (" + rawUrl + ") has invalid port: " + args[1]);
      }
    } else {
      host = hostPort;
    }

    if (host.isEmpty()) {
      badUrl(false, "Raw URL cannot have empty host: " + rawUrl);
    }

    String domain = host;
    boolean ipHost = isValidIP(host);
    if (!ipHost) {
      if (!isValidHost.apply(host)) {
        badUrl(false, "Raw URL (" + rawUrl + ") has invalid host: " + host);
      }
      domain = domainFromHost.apply(host);
    }

    return new URL(domain, host, path, port, secure, ipHost);
  }