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Diffstat (limited to 'src/org/traccar/http/BaseServlet.java')
-rw-r--r--src/org/traccar/http/BaseServlet.java76
1 files changed, 76 insertions, 0 deletions
diff --git a/src/org/traccar/http/BaseServlet.java b/src/org/traccar/http/BaseServlet.java
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+++ b/src/org/traccar/http/BaseServlet.java
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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.http;
+
+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;
+import javax.servlet.http.HttpSession;
+
+public abstract class BaseServlet extends HttpServlet {
+
+ public static final String USER_ID = "userId";
+
+ @Override
+ protected final void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+ String command = req.getPathInfo();
+ try {
+ if (command == null || !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(HttpSession session) {
+ Long userId = (Long) session.getAttribute(USER_ID);
+ if (userId == null) {
+ throw new AccessControlException("User is not logged in");
+ }
+ return userId;
+ }
+
+ public void sendResponse(Writer writer) throws IOException {
+ JsonObjectBuilder result = Json.createObjectBuilder();
+ result.add("success", true);
+ 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", error.getMessage());
+ writer.write(result.build().toString());
+ }
+
+}