protected boolean isValidAuthority()

in src/main/java/org/apache/commons/validator/routines/UrlValidator.java [378:433]
44 lines of code
15 McCabe index (conditional complexity)

    protected boolean isValidAuthority(final String authority) {
        if (authority == null) {
            return false;
        }

        // check manual authority validation if specified
        if (authorityValidator != null && authorityValidator.isValid(authority)) {
            return true;
        }
        // convert to ASCII if possible
        final String authorityASCII = DomainValidator.unicodeToASCII(authority);

        final Matcher authorityMatcher = AUTHORITY_PATTERN.matcher(authorityASCII);
        if (!authorityMatcher.matches()) {
            return false;
        }

        // We have to process IPV6 separately because that is parsed in a different group
        final String ipv6 = authorityMatcher.group(PARSE_AUTHORITY_IPV6);
        if (ipv6 != null) {
            final InetAddressValidator inetAddressValidator = InetAddressValidator.getInstance();
                if (!inetAddressValidator.isValidInet6Address(ipv6)) {
                    return false;
                }
        } else {
            final String hostLocation = authorityMatcher.group(PARSE_AUTHORITY_HOST_IP);
            // check if authority is hostname or IP address:
            // try a hostname first since that's much more likely
            if (!this.domainValidator.isValid(hostLocation)) {
                // try an IPv4 address
                final InetAddressValidator inetAddressValidator = InetAddressValidator.getInstance();
                if (!inetAddressValidator.isValidInet4Address(hostLocation)) {
                    // isn't IPv4, so the URL is invalid
                    return false;
                }
            }
            final String port = authorityMatcher.group(PARSE_AUTHORITY_PORT);
            if (port != null && !port.isEmpty()) {
                try {
                    final int iPort = Integer.parseInt(port);
                    if (iPort < 0 || iPort > MAX_UNSIGNED_16_BIT_INT) {
                        return false;
                    }
                } catch (final NumberFormatException nfe) {
                    return false; // this can happen for big numbers
                }
            }
        }

        final String extra = authorityMatcher.group(PARSE_AUTHORITY_EXTRA);
        if (extra != null && !extra.trim().isEmpty()){
            return false;
        }

        return true;
    }