| commit | author | age | ||
| 93f0b1 | 1 | /* |
| JM | 2 | * Copyright 2011 gitblit.com. |
| 3 | * | |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
| 5 | * you may not use this file except in compliance with the License. | |
| 6 | * You may obtain a copy of the License at | |
| 7 | * | |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
| 9 | * | |
| 10 | * Unless required by applicable law or agreed to in writing, software | |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 13 | * See the License for the specific language governing permissions and | |
| 14 | * limitations under the License. | |
| 15 | */ | |
| 16 | package com.gitblit; | |
| 17 | ||
| 18 | import java.io.BufferedReader; | |
| 19 | import java.io.IOException; | |
| 20 | import java.text.MessageFormat; | |
| 21 | ||
| 22 | import javax.servlet.ServletException; | |
| 23 | import javax.servlet.http.HttpServlet; | |
| 24 | import javax.servlet.http.HttpServletRequest; | |
| 25 | import javax.servlet.http.HttpServletResponse; | |
| 26 | ||
| 27 | import org.slf4j.Logger; | |
| 28 | import org.slf4j.LoggerFactory; | |
| 29 | ||
| 30 | import com.google.gson.Gson; | |
| 31 | import com.google.gson.GsonBuilder; | |
| 32 | ||
| 33 | /** | |
| 34 | * Servlet class for interpreting json requests. | |
| 35 | * | |
| 36 | * @author James Moger | |
| 37 | * | |
| 38 | */ | |
| 39 | public abstract class JsonServlet extends HttpServlet { | |
| 40 | ||
| 41 | private static final long serialVersionUID = 1L; | |
| 42 | ||
| 43 | protected final Logger logger; | |
| 44 | ||
| 45 | public JsonServlet() { | |
| 46 | super(); | |
| 47 | logger = LoggerFactory.getLogger(getClass()); | |
| 48 | } | |
| 49 | ||
| 50 | /** | |
| 51 | * Processes an gson request. | |
| 52 | * | |
| 53 | * @param request | |
| 54 | * @param response | |
| 55 | * @throws javax.servlet.ServletException | |
| 56 | * @throws java.io.IOException | |
| 57 | */ | |
| 58 | protected abstract void processRequest(HttpServletRequest request, HttpServletResponse response) | |
| 59 | throws ServletException, IOException; | |
| 60 | ||
| 61 | @Override | |
| 62 | protected void doPost(HttpServletRequest request, HttpServletResponse response) | |
| 63 | throws ServletException, java.io.IOException { | |
| 64 | processRequest(request, response); | |
| 65 | } | |
| 66 | ||
| 67 | @Override | |
| 68 | protected void doGet(HttpServletRequest request, HttpServletResponse response) | |
| 69 | throws ServletException, IOException { | |
| 70 | processRequest(request, response); | |
| 71 | } | |
| 72 | ||
| 73 | protected <X> X deserialize(HttpServletRequest request, HttpServletResponse response, | |
| 74 | Class<X> clazz) throws IOException { | |
| 75 | BufferedReader reader = request.getReader(); | |
| 76 | StringBuilder json = new StringBuilder(); | |
| 77 | String line = null; | |
| 78 | while ((line = reader.readLine()) != null) { | |
| 79 | json.append(line); | |
| 80 | } | |
| 81 | reader.close(); | |
| 82 | ||
| 83 | if (json.length() == 0) { | |
| 84 | logger.error(MessageFormat.format("Failed to receive json data from {0}", | |
| 85 | request.getRemoteAddr())); | |
| 86 | response.setStatus(HttpServletResponse.SC_BAD_REQUEST); | |
| 87 | return null; | |
| 88 | } | |
| 89 | ||
| 90 | Gson gson = new Gson(); | |
| 91 | X object = gson.fromJson(json.toString(), clazz); | |
| 92 | return object; | |
| 93 | } | |
| 94 | ||
| 95 | protected void serialize(HttpServletResponse response, Object o) throws IOException { | |
| 96 | if (o != null) { | |
| 97 | // Send JSON response | |
| 98 | Gson gson = new GsonBuilder().setPrettyPrinting().create(); | |
| 99 | String json = gson.toJson(o); | |
| 100 | response.getWriter().append(json); | |
| 101 | } | |
| 102 | } | |
| 103 | } | |
