package io.undertow.servlet.websockets;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import io.undertow.UndertowLogger;
import io.undertow.servlet.UndertowServletMessages;
import io.undertow.websockets.api.WebSocketSessionHandler;
import io.undertow.websockets.core.handler.WebSocketConnectionCallback;
import io.undertow.websockets.core.protocol.Handshake;
import io.undertow.websockets.core.protocol.version00.Hybi00Handshake;
import io.undertow.websockets.core.protocol.version07.Hybi07Handshake;
import io.undertow.websockets.core.protocol.version08.Hybi08Handshake;
import io.undertow.websockets.core.protocol.version13.Hybi13Handshake;
import io.undertow.websockets.impl.WebSocketSessionConnectionCallback;
/**
* @author Stuart Douglas
*/
public class WebSocketServlet extends HttpServlet {
public static final String SESSION_HANDLER = "io.undertow.handler";
private final List<Handshake> handshakes;
private WebSocketConnectionCallback callback;
public WebSocketServlet() {
this.handshakes = handshakes();
}
public WebSocketServlet(WebSocketConnectionCallback callback) {
this.callback = callback;
this.handshakes = handshakes();
}
@Override
public void init(final ServletConfig config) throws ServletException {
super.init(config);
try {
final String sessionHandler = config.getInitParameter(SESSION_HANDLER);
if (sessionHandler != null) {
final Class<?> clazz = Class.forName(sessionHandler, true, Thread.currentThread().getContextClassLoader());
final Object handler = clazz.newInstance();
if (handler instanceof WebSocketSessionHandler) {
this.callback = new WebSocketSessionConnectionCallback((WebSocketSessionHandler) handler);
} else {
this.callback = (WebSocketConnectionCallback) handler;
}
}
//TODO: set properties based on init params
} catch (ClassNotFoundException e) {
throw new ServletException(e);
} catch (InstantiationException e) {
throw new ServletException(e);
} catch (IllegalAccessException e) {
throw new ServletException(e);
}
if (callback == null) {
throw UndertowServletMessages.MESSAGES.noWebSocketHandler();
}
}
@Override
protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException {
final ServletWebSocketHttpExchange facade = new ServletWebSocketHttpExchange(req, resp);
Handshake handshaker = null;
for (Handshake method : handshakes) {
if (method.matches(facade)) {
handshaker = method;
break;
}
}
if (handshaker == null) {
UndertowLogger.REQUEST_LOGGER.debug("Could not find hand shaker for web socket request");
resp.sendError(400);
return;
}
handshaker.handshake(facade, callback);
}
protected List<Handshake> handshakes() {
List<Handshake> handshakes = new ArrayList<>();
handshakes.add(new Hybi13Handshake());
handshakes.add(new Hybi08Handshake());
handshakes.add(new Hybi07Handshake());
handshakes.add(new Hybi00Handshake());
return handshakes;
}
}