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/*
* Copyright 2015 Anton Tananaev (anton.tananaev@gmail.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 org.traccar.web;
import org.traccar.helper.Log;
import java.io.IOException;
import java.io.Writer;
import java.security.AccessControlException;
import javax.json.Json;
import javax.json.JsonObjectBuilder;
import javax.json.JsonStructure;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public abstract class BaseServlet extends HttpServlet {
public static final String USER_KEY = "user";
@Override
protected final void service(
HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String command = req.getPathInfo();
if (command == null) {
command = "";
}
try {
resp.setContentType("application/json");
resp.setCharacterEncoding("UTF-8");
resp.setHeader("Access-Control-Allow-Origin", "*");
resp.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
resp.setHeader("Access-Control-Allow-Methods", "GET, POST");
if (!handle(command, req, resp)) {
resp.sendError(HttpServletResponse.SC_BAD_REQUEST);
}
} catch (Exception error) {
sendResponse(resp.getWriter(), error);
}
}
protected abstract boolean handle(
String command, HttpServletRequest req, HttpServletResponse resp) throws Exception;
public long getUserId(HttpServletRequest req) {
Long userId = (Long) req.getSession().getAttribute(USER_KEY);
if (userId == null) {
throw new AccessControlException("User not logged in");
}
return userId;
}
public void sendResponse(Writer writer, boolean success) throws IOException {
JsonObjectBuilder result = Json.createObjectBuilder();
result.add("success", success);
writer.write(result.build().toString());
}
public void sendResponse(Writer writer, JsonStructure json) throws IOException {
JsonObjectBuilder result = Json.createObjectBuilder();
result.add("success", true);
result.add("data", json);
writer.write(result.build().toString());
}
public void sendResponse(Writer writer, Exception error) throws IOException {
JsonObjectBuilder result = Json.createObjectBuilder();
result.add("success", false);
result.add("error", Log.exceptionStack(error));
writer.write(result.build().toString());
}
}
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