private static Collection<Node> getNodeMatching(Node body, String regexp) {
final Collection<Node> nodes = new ArrayList<>();
if (body.getNodeName().matches(regexp)) nodes.add(body);
if (body.getChildNodes().getLength() == 0) return nodes;
NodeList returnList = body.getChildNodes();
for (int k = 0; k < returnList.getLength(); k++) {
final Node node = returnList.item(k);
nodes.addAll(getNodeMatching(node, regexp));
}
return nodes;
}
/**
* Discover WS device on the local network with specified filter
*
* @param regexpProtocol url protocol matching regexp like "^http$", might be empty ""
* @param regexpPath url path matching regexp like "onvif", might be empty ""
* @return list of unique device urls filtered
*/
public static Collection<URL> discoverWsDevicesAsUrls(String regexpProtocol, String regexpPath) {
final Collection<URL> urls =
new TreeSet<>(
new Comparator<URL>() {
public int compare(URL o1, URL o2) {
return o1.toString().compareTo(o2.toString());
}
});
for (String key : discoverWsDevices()) {
try {
final URL url = new URL(key);
boolean ok = true;
if (regexpProtocol.length() > 0 && !url.getProtocol().matches(regexpProtocol)) ok = false;
if (regexpPath.length() > 0 && !url.getPath().matches(regexpPath)) ok = false;
if (ok) urls.add(url);
} catch (MalformedURLException e) {
e.printStackTrace();
}
}
return urls;
}
/**
* Discover WS device on the local network
*
* @return list of unique devices access strings which might be URLs in most cases
*/
public static Collection<String> discoverWsDevices() {
final Collection<String> addresses = new ConcurrentSkipListSet<>();
final CountDownLatch serverStarted = new CountDownLatch(1);
final CountDownLatch serverFinished = new CountDownLatch(1);
final Collection<InetAddress> addressList = new ArrayList<>();
try {
final Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
if (interfaces != null) {
while (interfaces.hasMoreElements()) {
NetworkInterface anInterface = interfaces.nextElement();
if (!anInterface.isLoopback()) {
final List<InterfaceAddress> interfaceAddresses = anInterface.getInterfaceAddresses();
for (InterfaceAddress address : interfaceAddresses) {
addressList.add(address.getAddress());
}
}
}
}
} catch (SocketException e) {
e.printStackTrace();
}
ExecutorService executorService = Executors.newCachedThreadPool();
for (final InetAddress address : addressList) {
Runnable runnable =
new Runnable() {
public void run() {
try {
final String uuid = UUID.randomUUID().toString();
final String probe =
WS_DISCOVERY_PROBE_MESSAGE.replaceAll(
"<wsa:MessageID>urn:uuid:.*</wsa:MessageID>",
"<wsa:MessageID>urn:uuid:" + uuid + "</wsa:MessageID>");
final int port = random.nextInt(20000) + 40000;
@SuppressWarnings("SocketOpenedButNotSafelyClosed")
final DatagramSocket server = new DatagramSocket(port, address);
new Thread() {
public void run() {
try {
final DatagramPacket packet = new DatagramPacket(new byte[4096], 4096);
server.setSoTimeout(WS_DISCOVERY_TIMEOUT);
long timerStarted = System.currentTimeMillis();
while (System.currentTimeMillis() - timerStarted < (WS_DISCOVERY_TIMEOUT)) {
serverStarted.countDown();
server.receive(packet);
final Collection<String> collection =
parseSoapResponseForUrls(
Arrays.copyOf(packet.getData(), packet.getLength()));
for (String key : collection) {
addresses.add(key);
}
}
} catch (SocketTimeoutException ignored) {
} catch (Exception e) {
e.printStackTrace();
} finally {
serverFinished.countDown();
server.close();
}
}
}.start();
try {
serverStarted.await(1000, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
e.printStackTrace();
}
if (address instanceof Inet4Address) {
server.send(
new DatagramPacket(
probe.getBytes(),
probe.length(),
InetAddress.getByName(WS_DISCOVERY_ADDRESS_IPv4),
WS_DISCOVERY_PORT));
} else {
server.send(
new DatagramPacket(
probe.getBytes(),
probe.length(),
InetAddress.getByName(WS_DISCOVERY_ADDRESS_IPv6),
WS_DISCOVERY_PORT));
}
} catch (Exception e) {
e.printStackTrace();
}
try {
serverFinished.await((WS_DISCOVERY_TIMEOUT), TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
executorService.submit(runnable);
}
try {
executorService.shutdown();
executorService.awaitTermination(WS_DISCOVERY_TIMEOUT + 2000, TimeUnit.MILLISECONDS);
} catch (InterruptedException ignored) {
}
return addresses;
}