/*
* Copyright 2002-2013 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.socket.sockjs.transport.handler;
import java.util.Map;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.util.StringUtils;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.sockjs.SockJsException;
import org.springframework.web.socket.sockjs.SockJsTransportFailureException;
import org.springframework.web.socket.sockjs.frame.DefaultSockJsFrameFormat;
import org.springframework.web.socket.sockjs.frame.SockJsFrameFormat;
import org.springframework.web.socket.sockjs.transport.TransportType;
import org.springframework.web.socket.sockjs.transport.session.AbstractHttpSockJsSession;
import org.springframework.web.socket.sockjs.transport.session.PollingSockJsSession;
import org.springframework.web.util.JavaScriptUtils;
/**
* A TransportHandler that sends messages via JSONP polling.
*
* @author Rossen Stoyanchev
* @since 4.0
*/
public class JsonpPollingTransportHandler extends AbstractHttpSendingTransportHandler {
@Override
public TransportType getTransportType() {
return TransportType.JSONP;
}
@Override
protected MediaType getContentType() {
return new MediaType("application", "javascript", UTF8_CHARSET);
}
@Override
public PollingSockJsSession createSession(String sessionId, WebSocketHandler handler,
Map<String, Object> attributes) {
return new PollingSockJsSession(sessionId, getServiceConfig(), handler, attributes);
}
@Override
public void handleRequestInternal(ServerHttpRequest request, ServerHttpResponse response,
AbstractHttpSockJsSession sockJsSession) throws SockJsException {
try {
String callback = getCallbackParam(request);
if (! StringUtils.hasText(callback)) {
response.setStatusCode(HttpStatus.INTERNAL_SERVER_ERROR);
response.getBody().write("\"callback\" parameter required".getBytes("UTF-8"));
return;
}
}
catch (Throwable ex) {
sockJsSession.tryCloseWithSockJsTransportError(ex, CloseStatus.SERVER_ERROR);
throw new SockJsTransportFailureException("Failed to send error", sockJsSession.getId(), ex);
}
super.handleRequestInternal(request, response, sockJsSession);
}
@Override
protected SockJsFrameFormat getFrameFormat(ServerHttpRequest request) {
// we already validated the parameter above...
String callback = getCallbackParam(request);
return new DefaultSockJsFrameFormat(callback + "(\"%s\");\r\n") {
@Override
protected String preProcessContent(String content) {
return JavaScriptUtils.javaScriptEscape(content);
}
};
}
}