org.eclipse.dirigible.runtime.content.ThemesServlet.java Source code

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Here is the source code for org.eclipse.dirigible.runtime.content.ThemesServlet.java

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/*******************************************************************************
 * Copyright (c) 2016 SAP and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * Contributors:
 * SAP - initial API and implementation
 *******************************************************************************/

package org.eclipse.dirigible.runtime.content;

import java.io.IOException;

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

import org.apache.commons.lang.StringEscapeUtils;
import org.eclipse.dirigible.repository.api.ICommonConstants;
import org.eclipse.dirigible.repository.ext.utils.EnvUtils;
import org.eclipse.dirigible.repository.logging.Logger;

/**
 * Theme Service
 */
public class ThemesServlet extends HttpServlet {

    private static final String NAME_PARAM = "name"; //$NON-NLS-1$
    private static final String DEFAULT_THEME = "default"; //$NON-NLS-1$
    private static final String INIT_PARAM_DEFAULT_THEME = "defaultTheme"; //$NON-NLS-1$
    private static final String SLASH = "/"; //$NON-NLS-1$
    private static final long serialVersionUID = 3669759124907091014L;

    private static final Logger logger = Logger.getLogger(ThemesServlet.class);

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String env = EnvUtils.getEnv(INIT_PARAM_DEFAULT_THEME);
        String cookieValue = (env == null) ? DEFAULT_THEME : env;
        String themName = req.getParameter(NAME_PARAM);
        themName = StringEscapeUtils.escapeHtml(themName);
        themName = StringEscapeUtils.escapeJavaScript(themName);
        if ((null != themName) && !themName.isEmpty()) {
            themName = themName.trim();

            // if there is valid theme name, then force the setting of the cookie
            setCookieUser(resp, themName);
            cookieValue = themName;
        } else {
            // parameter not present, so look up in the cookies
            Cookie[] cookies = req.getCookies();
            String cookieName = ICommonConstants.COOKIE_THEME;
            for (Cookie cookie : cookies) {
                if (cookieName.equals(cookie.getName())) {
                    cookieValue = cookie.getValue();
                    // cookie exists, hence use it
                    break;
                }
            }
        }
        cookieValue = StringEscapeUtils.escapeHtml(cookieValue);
        cookieValue = StringEscapeUtils.escapeJavaScript(cookieValue);
        resp.getWriter().println(cookieValue.trim());
        resp.getWriter().flush();
        resp.getWriter().close();
    }

    private void setCookieUser(HttpServletResponse resp, String themeName) {
        Cookie cookie = new Cookie(ICommonConstants.COOKIE_THEME, themeName);
        cookie.setMaxAge(30 * 24 * 60 * 60);
        cookie.setPath(SLASH);
        resp.addCookie(cookie);
    }

}