private Set getDefaultAllowedReferrers()

in src/main/java/org/apache/sling/security/impl/ReferrerFilter.java [188:221]
32 lines of code
6 McCabe index (conditional complexity)

    private Set<String> getDefaultAllowedReferrers() {
        final Set<String> referrers = new HashSet<>();
        try {
            final Enumeration<NetworkInterface> ifaces = NetworkInterface.getNetworkInterfaces();

            while (ifaces.hasMoreElements()) {
                final NetworkInterface iface = ifaces.nextElement();
                logger.info("Adding Allowed referers for Interface: {}", iface.getDisplayName());
                final Enumeration<InetAddress> ias = iface.getInetAddresses();
                while (ias.hasMoreElements()) {
                    final InetAddress ia = ias.nextElement();
                    final String address = ia.getHostAddress().trim().toLowerCase();
                    if (ia instanceof Inet4Address) {
                        referrers.add("http://" + address + ":0");
                        referrers.add("https://" + address + ":0");
                    }
                    if (ia instanceof Inet6Address) {
                        referrers.add("http://[" + address + "]" + ":0");
                        referrers.add("https://[" + address + "]" + ":0");
                    }
                }
            }
        } catch (final SocketException se) {
            logger.error("Unable to detect network interfaces", se);
        }
        referrers.add("http://localhost" + ":0");
        referrers.add("http://127.0.0.1" + ":0");
        referrers.add("http://[::1]" + ":0");
        referrers.add("https://localhost" + ":0");
        referrers.add("https://127.0.0.1" + ":0");
        referrers.add("https://[::1]" + ":0");

        return referrers;
    }