| 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; | |
| 31abc2 | 20 | import java.lang.reflect.Type; |
| 93f0b1 | 21 | import java.text.MessageFormat; |
| JM | 22 | |
| 23 | import javax.servlet.ServletException; | |
| 24 | import javax.servlet.http.HttpServlet; | |
| 25 | import javax.servlet.http.HttpServletRequest; | |
| 26 | import javax.servlet.http.HttpServletResponse; | |
| 27 | ||
| 28 | import org.slf4j.Logger; | |
| 29 | import org.slf4j.LoggerFactory; | |
| 30 | ||
| f146f2 | 31 | import com.gitblit.utils.JsonUtils; |
| 31abc2 | 32 | import com.gitblit.utils.StringUtils; |
| 93f0b1 | 33 | |
| JM | 34 | /** |
| 35 | * Servlet class for interpreting json requests. | |
| 36 | * | |
| 37 | * @author James Moger | |
| 38 | * | |
| 39 | */ | |
| 40 | public abstract class JsonServlet extends HttpServlet { | |
| 41 | ||
| 42 | private static final long serialVersionUID = 1L; | |
| 43 | ||
| b2fde8 | 44 | protected final int forbiddenCode = HttpServletResponse.SC_FORBIDDEN; |
| JM | 45 | |
| 46 | protected final int notAllowedCode = HttpServletResponse.SC_METHOD_NOT_ALLOWED; | |
| 47 | ||
| 48 | protected final int failureCode = HttpServletResponse.SC_INTERNAL_SERVER_ERROR; | |
| 49 | ||
| 93f0b1 | 50 | protected final Logger logger; |
| JM | 51 | |
| 52 | public JsonServlet() { | |
| 53 | super(); | |
| 54 | logger = LoggerFactory.getLogger(getClass()); | |
| 55 | } | |
| 56 | ||
| 57 | /** | |
| 58 | * Processes an gson request. | |
| 59 | * | |
| 60 | * @param request | |
| 61 | * @param response | |
| 62 | * @throws javax.servlet.ServletException | |
| 63 | * @throws java.io.IOException | |
| 64 | */ | |
| 65 | protected abstract void processRequest(HttpServletRequest request, HttpServletResponse response) | |
| 66 | throws ServletException, IOException; | |
| 67 | ||
| 68 | @Override | |
| 69 | protected void doPost(HttpServletRequest request, HttpServletResponse response) | |
| 70 | throws ServletException, java.io.IOException { | |
| 71 | processRequest(request, response); | |
| 72 | } | |
| 73 | ||
| 74 | @Override | |
| 75 | protected void doGet(HttpServletRequest request, HttpServletResponse response) | |
| 76 | throws ServletException, IOException { | |
| 77 | processRequest(request, response); | |
| 78 | } | |
| 79 | ||
| 80 | protected <X> X deserialize(HttpServletRequest request, HttpServletResponse response, | |
| 81 | Class<X> clazz) throws IOException { | |
| 31abc2 | 82 | String json = readJson(request, response); |
| JM | 83 | if (StringUtils.isEmpty(json)) { |
| 84 | return null; | |
| 85 | } | |
| 86 | ||
| f146f2 | 87 | X object = JsonUtils.fromJsonString(json.toString(), clazz); |
| 31abc2 | 88 | return object; |
| JM | 89 | } |
| 90 | ||
| 91 | protected <X> X deserialize(HttpServletRequest request, HttpServletResponse response, Type type) | |
| 92 | throws IOException { | |
| 93 | String json = readJson(request, response); | |
| 94 | if (StringUtils.isEmpty(json)) { | |
| 95 | return null; | |
| 96 | } | |
| 97 | ||
| f146f2 | 98 | X object = JsonUtils.fromJsonString(json.toString(), type); |
| 31abc2 | 99 | return object; |
| JM | 100 | } |
| 101 | ||
| 102 | private String readJson(HttpServletRequest request, HttpServletResponse response) | |
| 103 | throws IOException { | |
| 93f0b1 | 104 | BufferedReader reader = request.getReader(); |
| JM | 105 | StringBuilder json = new StringBuilder(); |
| 106 | String line = null; | |
| 107 | while ((line = reader.readLine()) != null) { | |
| 108 | json.append(line); | |
| 109 | } | |
| 110 | reader.close(); | |
| 111 | ||
| 112 | if (json.length() == 0) { | |
| 113 | logger.error(MessageFormat.format("Failed to receive json data from {0}", | |
| 114 | request.getRemoteAddr())); | |
| 115 | response.setStatus(HttpServletResponse.SC_BAD_REQUEST); | |
| 116 | return null; | |
| 117 | } | |
| 31abc2 | 118 | return json.toString(); |
| 93f0b1 | 119 | } |
| JM | 120 | |
| 121 | protected void serialize(HttpServletResponse response, Object o) throws IOException { | |
| 122 | if (o != null) { | |
| 123 | // Send JSON response | |
| f146f2 | 124 | String json = JsonUtils.toJsonString(o); |
| d7ec6e | 125 | response.setCharacterEncoding(Constants.ENCODING); |
| 5e1f7d | 126 | response.setContentType("application/json"); |
| 93f0b1 | 127 | response.getWriter().append(json); |
| JM | 128 | } |
| 129 | } | |
| 130 | } | |
