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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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