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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.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.security.AccessControlException;
import java.util.Collection;
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;
import org.jboss.netty.handler.codec.http.HttpHeaders;
import org.jboss.netty.util.CharsetUtil;
import org.traccar.Context;
public abstract class BaseServlet extends HttpServlet {
public static final String USER_ID_KEY = "user";
public static final String ALLOW_ORIGIN_VALUE = "*";
public static final String ALLOW_HEADERS_VALUE = "Origin, X-Requested-With, Content-Type, Accept";
public static final String ALLOW_METHODS_VALUE = "GET, POST, PUT, DELETE";
public static final String APPLICATION_JSON = "application/json";
@Override
protected final void service(
HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
try {
resp.setContentType(APPLICATION_JSON);
resp.setCharacterEncoding(CharsetUtil.UTF_8.name());
resp.setHeader(HttpHeaders.Names.ACCESS_CONTROL_ALLOW_HEADERS, ALLOW_HEADERS_VALUE);
resp.setHeader(HttpHeaders.Names.ACCESS_CONTROL_ALLOW_METHODS, ALLOW_METHODS_VALUE);
String origin = req.getHeader(HttpHeaders.Names.ORIGIN);
String allowed = Context.getConfig().getString("web.origin");
if (allowed == null) {
resp.setHeader(HttpHeaders.Names.ACCESS_CONTROL_ALLOW_ORIGIN, ALLOW_ORIGIN_VALUE);
} else if (allowed.contains(origin)) {
String originSafe = URLEncoder.encode(origin, StandardCharsets.UTF_8.displayName());
resp.setHeader(HttpHeaders.Names.ACCESS_CONTROL_ALLOW_ORIGIN, originSafe);
}
if (!handle(getCommand(req), req, resp)) {
resp.sendError(HttpServletResponse.SC_BAD_REQUEST);
}
} catch (Exception error) {
if (error instanceof AccessControlException) {
resp.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
} else if (error instanceof SecurityException) {
resp.setStatus(HttpServletResponse.SC_FORBIDDEN);
}
sendResponse(resp.getWriter(), error);
}
}
protected abstract boolean handle(
String command, HttpServletRequest req, HttpServletResponse resp) throws Exception;
public long getUserId(HttpServletRequest req) throws Exception {
Object userId = req.getSession().getAttribute(USER_ID_KEY);
if (userId != null) {
return (Long) userId;
}
throw new AccessControlException("User not logged in");
}
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(HttpServletResponse resp, Collection collection) throws IOException {
if (collection.isEmpty()) {
resp.setStatus(HttpServletResponse.SC_NOT_FOUND);
}
JsonObjectBuilder result = Json.createObjectBuilder();
result.add("success", true);
result.add("data", JsonConverter.arrayToJson(collection));
resp.getWriter().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());
}
protected String getCommand(HttpServletRequest req) {
String command = req.getPathInfo();
if (command == null) {
command = "";
}
return command;
}
}
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