com.liferay.frontend.css.rtl.servlet.internal.RTLServlet Maven / Gradle / Ivy

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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.frontend.css.rtl.servlet.internal;

import com.liferay.frontend.css.rtl.servlet.internal.converter.CSSRTLConverter;
import com.liferay.petra.string.StringPool;
import com.liferay.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;
import com.liferay.portal.kernel.servlet.RequestDispatcherUtil;
import com.liferay.portal.kernel.util.ContentTypes;
import com.liferay.portal.kernel.util.FileUtil;
import com.liferay.portal.kernel.util.PortalUtil;
import com.liferay.portal.kernel.util.StreamUtil;
import com.liferay.portal.kernel.util.StringUtil;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLDecoder;

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

import org.osgi.framework.Bundle;
import org.osgi.service.http.context.ServletContextHelper;

/**
 * @author Carlos Sierra Andrés
 */
public class RTLServlet extends HttpServlet {

	public RTLServlet(
		Bundle bundle, ServletContextHelper servletContextHelper) {

		_bundle = bundle;
		_servletContextHelper = servletContextHelper;
	}

	@Override
	protected void doGet(
			HttpServletRequest httpServletRequest,
			HttpServletResponse httpServletResponse)
		throws IOException, ServletException {

		URL url = getResourceURL(httpServletRequest);

		if (url == null) {
			httpServletResponse.sendError(
				HttpServletResponse.SC_NOT_FOUND, "Not Found");
		}
		else {
			transfer(url, httpServletResponse);
		}
	}

	@Override
	protected long getLastModified(HttpServletRequest httpServletRequest) {
		try {
			URL url = getResourceURL(httpServletRequest);

			if (url != null) {
				URLConnection urlConnection = url.openConnection();

				return urlConnection.getLastModified();
			}

			return super.getLastModified(httpServletRequest);
		}
		catch (IOException ioe) {
			return super.getLastModified(httpServletRequest);
		}
	}

	protected URL getResourceURL(HttpServletRequest httpServletRequest)
		throws IOException {

		String path = URLDecoder.decode(
			RequestDispatcherUtil.getEffectivePath(httpServletRequest),
			StringPool.UTF8);

		URL url = _servletContextHelper.getResource(path);

		if (url == null) {
			return null;
		}

		String languageId = httpServletRequest.getParameter("languageId");

		if ((languageId == null) ||
			!PortalUtil.isRightToLeft(httpServletRequest)) {

			if (_log.isDebugEnabled()) {
				_log.debug(
					"Skip because specified language " + languageId +
						" is not right to left");
			}

			return url;
		}

		String rtlPath = FileUtil.appendSuffix(path, "_rtl");

		URL rtlURL = _servletContextHelper.getResource(rtlPath);

		if (rtlURL != null) {
			return rtlURL;
		}

		File dataFile = _bundle.getDataFile(rtlPath);

		if (dataFile.exists()) {
			URLConnection urlConnection = url.openConnection();

			if (dataFile.lastModified() > urlConnection.getLastModified()) {
				URI uri = dataFile.toURI();

				return uri.toURL();
			}
		}

		CSSRTLConverter cssRTLConverter = new CSSRTLConverter(false);

		String rtl = cssRTLConverter.process(StringUtil.read(url.openStream()));

		InputStream inputStream = new ByteArrayInputStream(
			rtl.getBytes(StringPool.UTF8));

		OutputStream outputStream = null;

		try {
			File parentFile = dataFile.getParentFile();

			parentFile.mkdirs();

			dataFile.createNewFile();

			outputStream = new FileOutputStream(dataFile);

			StreamUtil.transfer(inputStream, outputStream, false);
		}
		catch (IOException ioe) {
			if (_log.isWarnEnabled()) {
				_log.warn("Unable to cache RTL CSS", ioe);
			}
		}
		finally {
			if (outputStream != null) {
				outputStream.close();
			}
		}

		inputStream.reset();

		URI uri = dataFile.toURI();

		return uri.toURL();
	}

	protected void transfer(URL url, HttpServletResponse httpServletResponse)
		throws IOException {

		URLConnection urlConnection = url.openConnection();

		httpServletResponse.setContentLength(urlConnection.getContentLength());

		httpServletResponse.setContentType(ContentTypes.TEXT_CSS);
		httpServletResponse.setStatus(HttpServletResponse.SC_OK);

		StreamUtil.transfer(
			url.openStream(), httpServletResponse.getOutputStream());
	}

	private static final Log _log = LogFactoryUtil.getLog(RTLServlet.class);

	private final Bundle _bundle;
	private final ServletContextHelper _servletContextHelper;

}