package org.frameworkset.web.socket.sockjs.transport;
import java.util.Map;
import org.frameworkset.http.HttpStatus;
import org.frameworkset.http.MediaType;
import org.frameworkset.http.ServerHttpRequest;
import org.frameworkset.http.ServerHttpResponse;
import org.frameworkset.web.socket.inf.CloseStatus;
import org.frameworkset.web.socket.inf.WebSocketHandler;
import org.frameworkset.web.socket.sockjs.SockJsException;
import org.frameworkset.web.socket.sockjs.SockJsTransportFailureException;
import org.frameworkset.web.socket.sockjs.TransportType;
import org.frameworkset.web.socket.sockjs.frame.DefaultSockJsFrameFormat;
import org.frameworkset.web.socket.sockjs.frame.SockJsFrameFormat;
import org.frameworkset.web.socket.sockjs.session.AbstractHttpSockJsSession;
import org.frameworkset.web.socket.sockjs.session.PollingSockJsSession;
import org.frameworkset.web.util.JavaScriptUtils;
import com.frameworkset.util.StringUtil;
/**
* 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 (!StringUtil.hasText(callback)) {
response.setStatusCode(HttpStatus.INTERNAL_SERVER_ERROR);
response.getBody().write("\"callback\" parameter required".getBytes(UTF8_CHARSET));
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);
}
};
}
}