com.hastybox.lesscss.compileservice.controller.spring.UrlBasedSpringLessController.java Source code

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Here is the source code for com.hastybox.lesscss.compileservice.controller.spring.UrlBasedSpringLessController.java

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/* Copyright 2011-2012 The Cellador Hastybox Team.
 *
 * 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 com.hastybox.lesscss.compileservice.controller.spring;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.ModelAndView;

/**
 * Spring based Controller, that compiles LESS code to CSS on-the-fly
 * 
 * @author psy
 * 
 */
public class UrlBasedSpringLessController extends AbstractSpringLessController {

    /**
     * logger
     */
    private static final Logger LOGGER;

    static {
        LOGGER = LoggerFactory.getLogger(UrlBasedSpringLessController.class);
    }

    /**
     * base path to CSS files in request
     */
    @SuppressWarnings("unused")
    private String requestPath;

    /**
     * pattern to retrieve path to LESS file
     */
    private Pattern pathPattern;

    /**
     * Base path to all CSS files in the request. If all CSS files are in
     * http://my.domain.com/staticContent/css/*.css {@code requestPath} should
     * be set to {@code"/staticContent/css/"}. Regex is used to match request
     * paths. However do not use groups as this implementation tries to fetch
     * group 1 to find the path to the LESS file to compile.
     * 
     * @param requestPath
     *            the requestPath
     */
    public void setRequestPath(String requestPath) {
        this.requestPath = requestPath;

        // compile regex pattern
        this.pathPattern = Pattern.compile("^.+" + requestPath + "(.+)\\.css");
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.springframework.web.servlet.mvc.Controller#handleRequest(javax.servlet
     * .http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {

        String requestUri = request.getRequestURI();

        LOGGER.debug("Handling request to {}", requestUri);

        Matcher matcher = pathPattern.matcher(requestUri);

        if (!matcher.find()) {
            // no match found, return 404
            LOGGER.info("Request URI {} not mathing pattern, returning 404");

            response.sendError(404);
            return null;
        }

        String resourcePath = matcher.group(1) + ".less";

        // compile the LESS code
        compileLess(resourcePath, response);

        return null;
    }
}