SnippetServlet.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2022 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * 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.
 *
 * 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.turro.elephant.snippet;
 
import java.io.IOException;
import java.net.URLDecoder;
import java.nio.charset.StandardCharsets;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.IOUtils;
import org.turro.collections.KeyValueMap;
import org.turro.elephant.context.Application;
import org.turro.elephant.context.ElephantApplication;
import org.turro.log.WebLoggers;
 
@WebServlet(name = "Snippets", urlPatterns = {"/snippet_/*"})
public class SnippetServlet  extends HttpServlet {
 
  private void processJson(Application application, String path, KeyValueMap map) {
    Snippets.service(path).ifPresent(snippet -> snippet.process(application, map));
  }
 
  protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    KeyValueMap map = new KeyValueMap();
    if(hasJsonBody(request)) {
      map.put(Snippets.JSONPAR, readBody(request));
    }
    for(String key : request.getParameterMap().keySet()) {
      map.put(key, URLDecoder.decode(request.getParameter(key), StandardCharsets.UTF_8));
    }
    processJson(new ElephantApplication(request, response), request.getPathInfo(), map);
  }
 
  @Override
  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    processRequest(request, response);
  }
  
  @Override
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    processRequest(request, response);
  }
  
  @Override
  public String getServletInfo() {
    return "Elephant Snippets";
  }
 
  private boolean hasJsonBody(HttpServletRequest request) {
    return "application/json".equals(request.getHeader("Content-Type"));
  }
  
  private String readBody(HttpServletRequest request) {
    try {
      return IOUtils.toString(request.getReader());
    } catch (IOException ex) {
      WebLoggers.warning(SnippetServlet.class).exception(ex).message("Error reading request body").log();
    }
    return null;
  }
 
}