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/*
 * #%L
 * fujion
 * %%
 * Copyright (C) 2018 Fujion Framework
 * %%
 * 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.
 *
 * #L%
 */
package org.fujion.servlet;

import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.io.FilenameUtils;
import org.fujion.core.WebUtil;
import org.springframework.core.io.Resource;
import org.springframework.web.servlet.resource.AbstractResourceResolver;
import org.springframework.web.servlet.resource.ResourceResolverChain;

/**
 * Checks for the presence of a minified version of a resource, returning it instead if found.
 * Enabling debug mode essentially reverses this process, looking instead for a source version of
 * the requested resource. The algorithm assumes certain naming conventions for resources:
 * 
    *
  • *.min.[ext] for minified resources.
  • *
  • *.src.[ext] for source (unminified) resources.
  • *
* where [ext] is one of the supplied file extensions. */ public class MinifiedResourceResolver extends AbstractResourceResolver { private final boolean debugEnabled; private final String[] extensions; /** * @param extensions The file extensions to be considered. */ public MinifiedResourceResolver(String... extensions) { this.extensions = extensions; debugEnabled = WebUtil.isDebugEnabled(); } @Override protected Resource resolveResourceInternal(HttpServletRequest request, String requestPath, List locations, ResourceResolverChain chain) { boolean ignore = !FilenameUtils.isExtension(requestPath, extensions); if (!ignore) { int i = requestPath.lastIndexOf("."); String ext = debugEnabled ? ".src" : ".min"; String path = requestPath.substring(0, i) + ext + requestPath.substring(i); Resource resource = chain.resolveResource(request, path, locations); if (resource != null) { return resource; } } return chain.resolveResource(request, requestPath, locations); } @Override protected String resolveUrlPathInternal(String resourceUrlPath, List locations, ResourceResolverChain chain) { return chain.resolveUrlPath(resourceUrlPath, locations); } }




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