org.springframework.web.reactive.socket.server.upgrade.UndertowRequestUpgradeStrategy Maven / Gradle / Ivy
/*
* Copyright 2002-2017 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.reactive.socket.server.upgrade;
import java.net.URI;
import java.security.Principal;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import io.undertow.server.HttpServerExchange;
import io.undertow.websockets.WebSocketConnectionCallback;
import io.undertow.websockets.WebSocketProtocolHandshakeHandler;
import io.undertow.websockets.core.WebSocketChannel;
import io.undertow.websockets.core.protocol.Handshake;
import io.undertow.websockets.core.protocol.version13.Hybi13Handshake;
import io.undertow.websockets.spi.WebSocketHttpExchange;
import reactor.core.publisher.Mono;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.http.server.reactive.AbstractServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.web.reactive.socket.HandshakeInfo;
import org.springframework.web.reactive.socket.WebSocketHandler;
import org.springframework.web.reactive.socket.adapter.UndertowWebSocketHandlerAdapter;
import org.springframework.web.reactive.socket.adapter.UndertowWebSocketSession;
import org.springframework.web.reactive.socket.server.RequestUpgradeStrategy;
import org.springframework.web.server.ServerWebExchange;
/**
* A {@link RequestUpgradeStrategy} for use with Undertow.
*
* @author Violeta Georgieva
* @since 5.0
*/
public class UndertowRequestUpgradeStrategy implements RequestUpgradeStrategy {
@Override
public Mono upgrade(ServerWebExchange exchange, WebSocketHandler handler, @Nullable String subProtocol) {
ServerHttpRequest request = exchange.getRequest();
Assert.isInstanceOf(AbstractServerHttpRequest.class, request);
HttpServerExchange httpExchange = ((AbstractServerHttpRequest) request).getNativeRequest();
Set protocols = (subProtocol != null ? Collections.singleton(subProtocol) : Collections.emptySet());
Hybi13Handshake handshake = new Hybi13Handshake(protocols, false);
List handshakes = Collections.singletonList(handshake);
URI url = request.getURI();
HttpHeaders headers = request.getHeaders();
Mono principal = exchange.getPrincipal();
HandshakeInfo info = new HandshakeInfo(url, headers, principal, subProtocol);
DataBufferFactory bufferFactory = exchange.getResponse().bufferFactory();
try {
DefaultCallback callback = new DefaultCallback(info, handler, bufferFactory);
new WebSocketProtocolHandshakeHandler(handshakes, callback).handleRequest(httpExchange);
}
catch (Exception ex) {
return Mono.error(ex);
}
return Mono.empty();
}
private class DefaultCallback implements WebSocketConnectionCallback {
private final HandshakeInfo handshakeInfo;
private final WebSocketHandler handler;
private final DataBufferFactory bufferFactory;
public DefaultCallback(HandshakeInfo handshakeInfo, WebSocketHandler handler, DataBufferFactory bufferFactory) {
this.handshakeInfo = handshakeInfo;
this.handler = handler;
this.bufferFactory = bufferFactory;
}
@Override
public void onConnect(WebSocketHttpExchange httpExchange, WebSocketChannel channel) {
UndertowWebSocketSession session = createSession(channel);
UndertowWebSocketHandlerAdapter adapter = new UndertowWebSocketHandlerAdapter(session);
channel.getReceiveSetter().set(adapter);
channel.resumeReceives();
this.handler.handle(session).subscribe(session);
}
private UndertowWebSocketSession createSession(WebSocketChannel channel) {
return new UndertowWebSocketSession(channel, this.handshakeInfo, this.bufferFactory);
}
}
}