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An utility library for spring-based web-services for compressing / optimizing JS and CSS resources.
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/**
 * Copyright 2012 the project-owners
 *
 *    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 inti.ws.spring.resource;

import inti.util.DateFormatter;
import inti.ws.spring.exception.client.NotFoundException;
import inti.ws.spring.resource.config.ConfigParserSettings;
import inti.ws.spring.resource.config.ResourceConfig;
import inti.ws.spring.resource.config.ResourceConfigProvider;

import java.util.List;
import java.util.Map;

import javax.inject.Inject;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.http.HttpHeaders;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.util.AntPathMatcher;
import org.springframework.util.PathMatcher;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class ResourceController {

    private static final Logger LOGGER = LoggerFactory.getLogger(ResourceController.class);
    private static final String EXPIRES_IMMEDIATELY = "-1";

    @Inject
    ResourceConfigProvider configProvider;
    @Inject
    ServletContext ctx;
    ThreadLocal contexts = new ThreadLocal() {

        @Override
        protected ResourceWorkingContext initialValue() {
            return new ResourceWorkingContext();
        }

    };
    DateFormatter dateFormatter = new DateFormatter();
    PathMatcher pathMatcher = new AntPathMatcher();

    protected void applyCachingHeader(HttpServletResponse response, WebResource resource, ConfigParserSettings settings) {
        ResourceWorkingContext ctx = contexts.get();

        if (settings != null) {

            if (settings.getExpires() > 0) {

                // http://en.wikipedia.org/wiki/List_of_HTTP_header_fields
                ctx.clearBuilder();
                dateFormatter.formatDate(System.currentTimeMillis() + settings.getExpires(), ctx.getBuilder());
                response.addHeader(HttpHeaders.EXPIRES, ctx.getBuilder().toString());

                if (resource.getMessageDigest() != null) {
                    response.setHeader(HttpHeaders.ETAG, resource.getMessageDigest());
                }

                if (resource.getLastModifiedString() != null) {
                    response.setHeader(HttpHeaders.LAST_MODIFIED, resource.getLastModifiedString());
                }

            } else {

                response.addHeader(HttpHeaders.EXPIRES, EXPIRES_IMMEDIATELY);

            }

            if (settings.getCacheControl() != null) {
                response.setHeader(HttpHeaders.CACHE_CONTROL, settings.getCacheControl());
            }

        }

    }

    protected void resource(String name, WebResource resource, HttpServletRequest request,
                    HttpServletResponse response, ConfigParserSettings settings) throws Exception {
        String tmp;

        resource.updateIfNeeded();

        if ((tmp = request.getHeader(HttpHeaders.IF_MODIFIED_SINCE)) != null) {
            if (resource.getLastModified() <= dateFormatter.parseDate(tmp)) {
                response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
                return;
            }
        } else if ((tmp = request.getHeader(HttpHeaders.IF_NONE_MATCH)) != null) {
            if (tmp.equals(resource.getMessageDigest())) {
                response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
                return;
            }
        }

        if (settings != null) {

            try {
                applyCachingHeader(response, resource, settings);
            } catch (Exception exception) {
                LOGGER.debug("", exception);
            }

            if (settings.getContentType() != null) {
                response.setHeader(HttpHeaders.CONTENT_TYPE, settings.getContentType());
            }

            if (settings.getContentEncoding() != null) {
                response.setHeader(HttpHeaders.CONTENT_ENCODING, settings.getContentEncoding());
            }

            try {
                resource.processResponse(request, response, settings);
            } catch (Exception exception) {
                LOGGER.debug("", exception);
            }

            byte[] data = resource.getByteContent(settings);

            if (data != null) {
                response.getOutputStream().write(data);
                response.getOutputStream().close();
            }

        }

    }

    @RequestMapping(value = "/**/*.*", method = RequestMethod.GET)
    public void resource(HttpServletRequest request, HttpServletResponse response) throws Exception {
        String uri = request.getRequestURI();
        List configs = configProvider.getResourceConfigs(request);

        if (!ctx.getContextPath().equals("")) {
            uri = uri.replaceFirst(ctx.getContextPath(), "");
        }

        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("resource - handling request for uri={}", uri);
            LOGGER.debug("resource - searching in={}", configs);
        }

        if (configs != null) {

            for (ResourceConfig config : configs) {

                for (Map.Entry resource : config.getResources().entrySet()) {

                    WebResource webResource = resource.getValue();

                    if (webResource.getRoute() != null && pathMatcher.match(webResource.getRoute(), uri)) {

                        LOGGER.debug("resource - resource found for uri={}", uri);
                        resource(resource.getKey(), resource.getValue(), request, response, config.getSettings());
                        return;

                    }

                }

            }

        }

        throw new NotFoundException("resource not found: " + uri);

    }

}