org.jbpm.designer.server.StencilSetJSONPServlet.java Source code

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Here is the source code for org.jbpm.designer.server.StencilSetJSONPServlet.java

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/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * 
 *      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 org.jbpm.designer.server;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;

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

import org.json.JSONArray;
import org.json.JSONObject;

/**
 * 
 * @author jan-felix.schwarz@student.hpi.uni-potsdam.de
 *
 */
public class StencilSetJSONPServlet extends HttpServlet {

    private static final long serialVersionUID = 6084194342174761093L;

    protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {

        res.setContentType("application/json");

        String resource = req.getParameter("resource");
        String type = req.getParameter("type");
        String jsonp = req.getParameter("jsonp");
        String embedSvg = req.getParameter("embedsvg");

        try {
            PrintWriter out = res.getWriter();

            // also allow to request stencil set extensions (specified by namespace)
            if (type != null && type.equals("ssextension")) {

                File extensionsFile = new File(
                        getServletContext().getRealPath("/stencilsets/extensions/extensions.json"));
                BufferedReader reader = new BufferedReader(new FileReader(extensionsFile));
                String line = null;
                String jsonString = "";
                while ((line = reader.readLine()) != null) {
                    jsonString += line;
                }
                JSONObject jsonObj = new JSONObject(jsonString);
                JSONArray extArr = jsonObj.getJSONArray("extensions");
                for (int i = 0; i < extArr.length(); i++) {
                    if (extArr.getJSONObject(i).getString("namespace").equals(resource)) {
                        String definition = extArr.getJSONObject(i).getString("definition");
                        File jsonFile = new File(
                                getServletContext().getRealPath("/stencilsets/extensions/" + definition));
                        if (jsonp != null)
                            out.append(jsonp + "(");
                        BufferedReader reader2 = new BufferedReader(new FileReader(jsonFile));
                        String line2 = null;
                        while ((line2 = reader2.readLine()) != null) {
                            out.append(line2);
                            out.append(System.getProperty("line.separator"));
                        }
                        if (jsonp != null)
                            out.append(");");
                    }
                }

            } else { // standard stencil set requested (specified by path)

                resource = resource.replace("..", ""); // don't allow to leave stencilset dir

                if (resource.startsWith("/"))
                    resource = resource.substring(1);

                if (resource.startsWith("stencilsets/")) // ignore stencilset/ at beginning of path reference
                    resource = resource.substring(12);

                File jsonFile;
                if (embedSvg != null && embedSvg.equals("true")) { // SVG embedding
                    jsonFile = new File(getServletContext().getRealPath("/stencilsets/" + resource));
                } else { // no SVG embedding (default)
                    // try to find stencilset nosvg representation
                    int pIdx = resource.lastIndexOf('.');
                    jsonFile = new File(getServletContext().getRealPath(
                            "/stencilsets/" + resource.substring(0, pIdx) + "-nosvg" + resource.substring(pIdx)));
                    if (!jsonFile.exists())
                        jsonFile = new File(getServletContext().getRealPath("/stencilsets/" + resource));
                }

                if (!jsonFile.exists()) {
                    if (jsonp != null)
                        out.write(jsonp + "({ \"error\":\"resource not found\" })");
                    else
                        out.write("{ \"error\":\"resource not found\" }");
                }

                if (jsonp != null)
                    out.append(jsonp + "(");

                BufferedReader reader = new BufferedReader(new FileReader(jsonFile));
                String line = null;
                while ((line = reader.readLine()) != null) {
                    out.append(line);
                    out.append(System.getProperty("line.separator"));
                }
                if (jsonp != null)
                    out.append(");");

            }

        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}