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/*
* The MIT License
*
* Copyright (c) 2009-2023 PrimeTek Informatics
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.primefaces.application.resource;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;
import java.util.function.Consumer;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.el.ELContext;
import javax.el.ValueExpression;
import javax.faces.application.ProjectStage;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.primefaces.model.StreamedContent;
import org.primefaces.util.Constants;
public class StreamedContentHandler extends BaseDynamicContentHandler {
private static final Logger LOGGER = Logger.getLogger(StreamedContentHandler.class.getName());
@Override
public void handle(FacesContext context) throws IOException {
Map params = context.getExternalContext().getRequestParameterMap();
String library = params.get("ln");
String resourceKey = params.get(Constants.DYNAMIC_CONTENT_PARAM);
if (resourceKey != null && library != null && library.equals(Constants.LIBRARY)) {
boolean cache = Boolean.parseBoolean(params.get(Constants.DYNAMIC_CONTENT_CACHE_PARAM));
try {
ExternalContext externalContext = context.getExternalContext();
Map session = externalContext.getSessionMap();
Map dynamicResourcesMapping = (Map) session.get(Constants.DYNAMIC_RESOURCES_MAPPING);
if (dynamicResourcesMapping != null) {
String dynamicContentEL = dynamicResourcesMapping.get(resourceKey);
if (dynamicContentEL != null) {
ELContext eLContext = context.getELContext();
ValueExpression ve = context.getApplication().getExpressionFactory().createValueExpression(
context.getELContext(), dynamicContentEL, Object.class);
Object value = ve.getValue(eLContext);
if (value == null) {
if (context.isProjectStage(ProjectStage.Development)) {
LOGGER.log(Level.WARNING,
"Dynamic content resolved to null - skip streaming resource for ValueExpression: {0}",
dynamicContentEL);
}
sendNotFound(externalContext);
return;
}
if (value instanceof StreamedContent) {
StreamedContent streamedContent = (StreamedContent) value;
if (streamedContent.getWriter() != null) {
setResponseHeaders(streamedContent, externalContext);
stream(externalContext, streamedContent.getWriter(), cache);
}
else {
if (streamedContent.getStream() == null) {
if (context.isProjectStage(ProjectStage.Development)) {
LOGGER.log(Level.WARNING,
"Stream of StreamedContent resolved to null - skip streaming resource for ValueExpression: {0}",
dynamicContentEL);
}
sendNotFound(externalContext);
return;
}
try (InputStream inputStream = streamedContent.getStream().get()) {
if (inputStream == null) {
if (context.isProjectStage(ProjectStage.Development)) {
LOGGER.log(Level.WARNING,
"Stream of StreamedContent resolved to null - skip streaming resource for ValueExpression: {0}",
dynamicContentEL);
}
sendNotFound(externalContext);
return;
}
setResponseHeaders(streamedContent, externalContext);
stream(externalContext, inputStream, cache);
}
}
}
else if (value instanceof InputStream) {
try (InputStream inputStream = (InputStream) value) {
stream(externalContext, inputStream, cache);
}
}
else if (value instanceof byte[]) {
try (InputStream inputStream = new ByteArrayInputStream((byte[]) value)) {
stream(externalContext, inputStream, cache);
}
}
}
}
externalContext.responseFlushBuffer();
context.responseComplete();
}
catch (Exception e) {
throw new IOException("Error in streaming dynamic resource. Verify you are not using a @ViewScoped bean.", e);
}
}
}
protected void setResponseHeaders(StreamedContent streamedContent, ExternalContext externalContext) {
if (streamedContent.getContentType() != null) {
externalContext.setResponseContentType(streamedContent.getContentType());
}
if (streamedContent.getContentLength() != null) {
// we can't use externalContext.setResponseContentLength as our contentLength is a long
externalContext.setResponseHeader("Content-Length", String.valueOf(streamedContent.getContentLength()));
}
if (streamedContent.getContentEncoding() != null) {
externalContext.setResponseHeader("Content-Encoding", streamedContent.getContentEncoding());
}
if (streamedContent.getName() != null) {
externalContext.setResponseHeader("Content-Disposition", "inline;filename=\"" + streamedContent.getName() + "\"");
}
}
protected void stream(ExternalContext externalContext, InputStream inputStream, boolean cache) throws IOException {
externalContext.setResponseStatus(HttpServletResponse.SC_OK);
handleCache(externalContext, cache);
byte[] buffer = new byte[2048];
int length;
while ((length = (inputStream.read(buffer))) >= 0) {
externalContext.getResponseOutputStream().write(buffer, 0, length);
}
}
protected void stream(ExternalContext externalContext, Consumer writer, boolean cache) throws IOException {
externalContext.setResponseStatus(HttpServletResponse.SC_OK);
handleCache(externalContext, cache);
writer.accept(externalContext.getResponseOutputStream());
}
protected void sendNotFound(ExternalContext externalContext) throws IOException {
if (externalContext.getRequest() instanceof HttpServletRequest) {
externalContext.responseSendError(HttpServletResponse.SC_NOT_FOUND,
((HttpServletRequest) externalContext.getRequest()).getRequestURI());
}
else {
externalContext.responseSendError(HttpServletResponse.SC_NOT_FOUND, null);
}
}
}
