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- /*
- * Copyright 2011 gitblit.com.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * 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 com.gitblit.servlet;
-
- import java.io.BufferedReader;
- import java.io.IOException;
- import java.lang.reflect.Type;
- import java.text.MessageFormat;
-
- import javax.servlet.ServletException;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
-
- import org.slf4j.Logger;
- import org.slf4j.LoggerFactory;
-
- import com.gitblit.Constants;
- import com.gitblit.utils.JsonUtils;
- import com.gitblit.utils.StringUtils;
-
- /**
- * Servlet class for interpreting json requests.
- *
- * @author James Moger
- *
- */
- public abstract class JsonServlet extends HttpServlet {
-
- private static final long serialVersionUID = 1L;
-
- protected final int forbiddenCode = HttpServletResponse.SC_FORBIDDEN;
-
- protected final int notAllowedCode = HttpServletResponse.SC_METHOD_NOT_ALLOWED;
-
- protected final int failureCode = HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
-
- protected final Logger logger;
-
- public JsonServlet() {
- super();
- logger = LoggerFactory.getLogger(getClass());
- }
-
- /**
- * Processes an gson request.
- *
- * @param request
- * @param response
- * @throws javax.servlet.ServletException
- * @throws java.io.IOException
- */
- protected abstract void processRequest(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException;
-
- @Override
- protected void doPost(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, java.io.IOException {
- processRequest(request, response);
- }
-
- @Override
- protected void doGet(HttpServletRequest request, HttpServletResponse response)
- throws ServletException, IOException {
- processRequest(request, response);
- }
-
- protected <X> X deserialize(HttpServletRequest request, HttpServletResponse response,
- Class<X> clazz) throws IOException {
- String json = readJson(request, response);
- if (StringUtils.isEmpty(json)) {
- return null;
- }
-
- X object = JsonUtils.fromJsonString(json.toString(), clazz);
- return object;
- }
-
- protected <X> X deserialize(HttpServletRequest request, HttpServletResponse response, Type type)
- throws IOException {
- String json = readJson(request, response);
- if (StringUtils.isEmpty(json)) {
- return null;
- }
-
- X object = JsonUtils.fromJsonString(json.toString(), type);
- return object;
- }
-
- private String readJson(HttpServletRequest request, HttpServletResponse response)
- throws IOException {
- BufferedReader reader = request.getReader();
- StringBuilder json = new StringBuilder();
- String line = null;
- while ((line = reader.readLine()) != null) {
- json.append(line);
- }
- reader.close();
-
- if (json.length() == 0) {
- logger.error(MessageFormat.format("Failed to receive json data from {0}",
- request.getRemoteAddr()));
- response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
- return null;
- }
- return json.toString();
- }
-
- protected void serialize(HttpServletResponse response, Object o) throws IOException {
- if (o != null) {
- // Send JSON response
- String json = JsonUtils.toJsonString(o);
- response.setCharacterEncoding(Constants.ENCODING);
- response.setContentType("application/json");
- response.getWriter().append(json);
- }
- }
- }
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