ManifestServlet.java

/*
 * Copyright (C) 2000 - 2025 Silverpeas
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * As a special exception to the terms and conditions of version 3.0 of
 * the GPL, you may redistribute this Program in connection with Free/Libre
 * Open Source Software ("FLOSS") applications as described in Silverpeas's
 * FLOSS exception.  You should have received a copy of the text describing
 * the FLOSS exception, and it is also available here:
 * "https://www.silverpeas.org/legal/floss_exception.html"
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.silverpeas.mobile.server.servlets;


import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.apache.commons.io.IOUtils;
import org.silverpeas.kernel.logging.SilverLogger;
import org.silverpeas.kernel.util.StringUtil;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.nio.charset.StandardCharsets;

/**
 * @author: svu
 */
public class ManifestServlet extends AbstractSilverpeasMobileServlet {
  protected void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    try {
      response.setContentType("application/json");
      response.setHeader("Cache-Control", "private, no-store, no-cache, must-revalidate");
      response.setHeader("Pragma", "no-cache");

      PrintWriter out = response.getWriter();

      ServletContext context = getServletContext();
      String path = getSettings().getString("manifest.json.path", "");
      InputStream template;
      if (StringUtil.isDefined(path)) {
        template = new FileInputStream(path);
      } else {
        template =
            context.getResourceAsStream("/WEB-INF/manifest.json.template");
      }
      out.println(IOUtils.toString(template, StandardCharsets.UTF_8));
    } catch (Exception e) {
      SilverLogger.getLogger(this).error(e);
    }
  }
}