/*
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* Copyright 2011 gitblit.com.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.gitblit.servlet;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.lang.reflect.Type;
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import java.text.MessageFormat;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.gitblit.Constants;
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import com.gitblit.utils.JsonUtils;
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import com.gitblit.utils.StringUtils;
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/**
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* Servlet class for interpreting json requests.
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*
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* @author James Moger
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*
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*/
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public abstract class JsonServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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protected final int forbiddenCode = HttpServletResponse.SC_FORBIDDEN;
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protected final int notAllowedCode = HttpServletResponse.SC_METHOD_NOT_ALLOWED;
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protected final int failureCode = HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
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protected final Logger logger;
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public JsonServlet() {
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super();
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logger = LoggerFactory.getLogger(getClass());
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}
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/**
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* Processes an gson request.
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*
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* @param request
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* @param response
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* @throws javax.servlet.ServletException
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* @throws java.io.IOException
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*/
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protected abstract void processRequest(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException;
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@Override
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protected void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, java.io.IOException {
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processRequest(request, response);
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}
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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processRequest(request, response);
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}
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protected <X> X deserialize(HttpServletRequest request, HttpServletResponse response,
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Class<X> clazz) throws IOException {
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String json = readJson(request, response);
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if (StringUtils.isEmpty(json)) {
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return null;
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}
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X object = JsonUtils.fromJsonString(json.toString(), clazz);
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return object;
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}
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protected <X> X deserialize(HttpServletRequest request, HttpServletResponse response, Type type)
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throws IOException {
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String json = readJson(request, response);
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if (StringUtils.isEmpty(json)) {
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return null;
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}
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X object = JsonUtils.fromJsonString(json.toString(), type);
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return object;
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}
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private String readJson(HttpServletRequest request, HttpServletResponse response)
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throws IOException {
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BufferedReader reader = request.getReader();
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StringBuilder json = new StringBuilder();
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String line = null;
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while ((line = reader.readLine()) != null) {
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json.append(line);
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}
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reader.close();
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if (json.length() == 0) {
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logger.error(MessageFormat.format("Failed to receive json data from {0}",
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request.getRemoteAddr()));
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response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
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return null;
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}
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return json.toString();
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}
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protected void serialize(HttpServletResponse response, Object o) throws IOException {
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if (o != null) {
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// Send JSON response
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String json = JsonUtils.toJsonString(o);
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response.setCharacterEncoding(Constants.ENCODING);
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response.setContentType("application/json");
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response.getWriter().append(json);
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}
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}
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}
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