/*
* [The "BSD licence"]
* Copyright (c) 2013-2014 Dandelion
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Dandelion nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.github.dandelion.core.web;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.github.dandelion.core.Context;
import com.github.dandelion.core.asset.AssetType;
import com.github.dandelion.core.asset.cache.spi.AssetCache;
/**
* <p>
* Dandelion servlet in charge of serving the assets stored in the configured
* {@link AssetCache}.
*
* @author Thibault Duchateau
* @author Romain Lespinasse
* @since 0.10.0
*/
public class DandelionServlet extends HttpServlet {
private static final long serialVersionUID = -6874842638265359418L;
private static Logger LOG = LoggerFactory.getLogger(DandelionServlet.class);
public static final String DANDELION_ASSETS = "dandelionAssets";
public static final String DANDELION_ASSETS_URL = "/dandelion-assets/";
public static final String DANDELION_ASSETS_URL_PATTERN = "/dandelion-assets/*";
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
getLogger().debug("Dandelion Asset servlet captured GET request {}", request.getRequestURI());
Context context = (Context) request.getAttribute(WebConstants.DANDELION_CONTEXT_ATTRIBUTE);
HttpHeadersConfigurer httpHeadersConfigurer = new HttpHeadersConfigurer(context);
// Get the asset content thanks to the cache key
String assetKey = context.getCacheManager().getCacheKeyFromRequest(request);
AssetType assetType = AssetType.typeOfAsset(assetKey);
// Configure response headers
httpHeadersConfigurer.configureResponseHeaders(response, assetType.getContentType());
// Send the asset's content
PrintWriter writer = response.getWriter();
writer.write(context.getCacheManager().getContent(assetKey));
// The response is explicitely closed here instead of setting a
// Content-Length header
writer.close();
}
protected Logger getLogger() {
return LOG;
}
}