/*
* Copyright 2009-2014 PrimeTek.
*
* 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.primefaces.application.resource;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.el.ELContext;
import javax.el.ValueExpression;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import org.primefaces.context.RequestContext;
import org.primefaces.model.StreamedContent;
import org.primefaces.util.Constants;
import org.primefaces.util.StringEncrypter;
public class StreamedContentHandler extends BaseDynamicContentHandler {
private final static Logger logger = Logger.getLogger(StreamedContentHandler.class.getName());
public void handle(FacesContext context) throws IOException {
Map<String,String> params = context.getExternalContext().getRequestParameterMap();
String library = params.get("ln");
String dynamicContentId = (String) params.get(Constants.DYNAMIC_CONTENT_PARAM);
StringEncrypter strEn = RequestContext.getCurrentInstance().getEncrypter();
if(dynamicContentId != null && library != null && library.equals(Constants.LIBRARY)) {
StreamedContent streamedContent = null;
boolean cache = Boolean.valueOf(params.get(Constants.DYNAMIC_CONTENT_CACHE_PARAM));
try {
String dynamicContentEL = strEn.decrypt(dynamicContentId);
ExternalContext externalContext = context.getExternalContext();
if(dynamicContentEL != null) {
ELContext eLContext = context.getELContext();
ValueExpression ve = context.getApplication().getExpressionFactory().createValueExpression(context.getELContext(), dynamicContentEL, StreamedContent.class);
streamedContent = (StreamedContent) ve.getValue(eLContext);
externalContext.setResponseStatus(200);
externalContext.setResponseContentType(streamedContent.getContentType());
handleCache(externalContext, cache);
if(streamedContent.getContentEncoding() != null) {
externalContext.setResponseHeader("Content-Encoding", streamedContent.getContentEncoding());
}
byte[] buffer = new byte[2048];
int length;
InputStream inputStream = streamedContent.getStream();
while ((length = (inputStream.read(buffer))) >= 0) {
externalContext.getResponseOutputStream().write(buffer, 0, length);
}
}
externalContext.responseFlushBuffer();
context.responseComplete();
} catch(Exception e) {
logger.log(Level.SEVERE, "Error in streaming dynamic resource. {0}", new Object[]{e.getMessage()});
throw new IOException(e);
}
finally {
//cleanup
if(streamedContent != null) {
streamedContent.getStream().close();
}
}
}
}
}