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/*
* Copyright (c) 2017 Google Inc. All Rights Reserved.
*
* 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.android.vts.api;
import com.android.vts.entity.TestEntity;
import com.android.vts.entity.UserFavoriteEntity;
import com.google.appengine.api.datastore.DatastoreService;
import com.google.appengine.api.datastore.DatastoreServiceFactory;
import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.datastore.EntityNotFoundException;
import com.google.appengine.api.datastore.Key;
import com.google.appengine.api.datastore.KeyFactory;
import com.google.appengine.api.datastore.Query;
import com.google.appengine.api.datastore.Query.CompositeFilterOperator;
import com.google.appengine.api.datastore.Query.Filter;
import com.google.appengine.api.datastore.Query.FilterOperator;
import com.google.appengine.api.datastore.Query.FilterPredicate;
import com.google.appengine.api.datastore.Transaction;
import com.google.appengine.api.users.User;
import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;
import com.google.gson.Gson;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/** Servlet for handling requests to add or remove subscriptions. */
public class UserFavoriteRestServlet extends BaseApiServlet {
protected static final Logger logger =
Logger.getLogger(UserFavoriteRestServlet.class.getName());
/**
* Add a new favorite entity.
*
* @param user The user for which to add a favorite.
* @param test The name of the test.
* @param muteNotifications True if the subscriber has muted notifications, false otherwise.
* @param response The servlet response object.
* @return a json object with the generated key to the new favorite entity.
* @throws IOException
*/
private static JsonObject addFavorite(
User user, String test, boolean muteNotifications, HttpServletResponse response)
throws IOException {
DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
Key addedTestKey = KeyFactory.createKey(TestEntity.KIND, test);
// Filter the tests that exist from the set of tests to add
try {
datastore.get(addedTestKey);
} catch (EntityNotFoundException e) {
response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
return null;
}
Filter userFilter =
new FilterPredicate(UserFavoriteEntity.USER, FilterOperator.EQUAL, user);
Filter testFilter =
new FilterPredicate(
UserFavoriteEntity.TEST_KEY, FilterOperator.EQUAL, addedTestKey);
Query q =
new Query(UserFavoriteEntity.KIND)
.setFilter(CompositeFilterOperator.and(userFilter, testFilter))
.setKeysOnly();
Key favoriteKey = null;
Transaction txn = datastore.beginTransaction();
try {
for (Entity e : datastore.prepare(q).asIterable()) {
favoriteKey = e.getKey();
break;
}
if (favoriteKey == null) {
UserFavoriteEntity favorite =
new UserFavoriteEntity(user, addedTestKey, muteNotifications);
Entity entity = favorite.toEntity();
datastore.put(entity);
favoriteKey = entity.getKey();
}
txn.commit();
} finally {
if (txn.isActive()) {
logger.log(
Level.WARNING,
"Transaction rollback forced for favorite creation: " + test);
txn.rollback();
}
}
JsonObject json = new JsonObject();
json.add("key", new JsonPrimitive(KeyFactory.keyToString(favoriteKey)));
return json;
}
/**
* @param user The user for which to add a favorite.
* @param favoriteKey The database key to the favorite entity to update.
* @param muteNotifications True if the subscriber has muted notifications, false otherwise.
* @param response The servlet response object.
* @return a json object with the generated key to the new favorite entity.
* @throws IOException
*/
private static JsonObject updateFavorite(
User user, Key favoriteKey, boolean muteNotifications, HttpServletResponse response)
throws IOException {
DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
Entity favoriteEntity;
try {
favoriteEntity = datastore.get(favoriteKey);
} catch (EntityNotFoundException e) {
response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
return null;
}
UserFavoriteEntity favorite = UserFavoriteEntity.fromEntity(favoriteEntity);
if (favorite.user.getUserId() == user.getUserId()) {
response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
return null;
}
if (favorite.muteNotifications != muteNotifications) {
Transaction txn = datastore.beginTransaction();
try {
favorite.muteNotifications = muteNotifications;
datastore.put(favorite.toEntity());
txn.commit();
} finally {
if (txn.isActive()) {
logger.log(
Level.WARNING,
"Transaction rollback forced for favorite update: " + favoriteKey);
txn.rollback();
}
}
}
JsonObject json = new JsonObject();
json.add("key", new JsonPrimitive(KeyFactory.keyToString(favoriteKey)));
return json;
}
/** Add a test to the user's favorites. */
@Override
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException {
UserService userService = UserServiceFactory.getUserService();
User currentUser = userService.getCurrentUser();
boolean muteNotifications = false;
if (request.getParameter(UserFavoriteEntity.MUTE_NOTIFICATIONS) != null) {
muteNotifications =
Boolean.parseBoolean(
request.getParameter(UserFavoriteEntity.MUTE_NOTIFICATIONS));
}
String userFavoritesKeyString = request.getParameter("userFavoritesKey");
String testName = request.getParameter("testName");
JsonObject returnData = null;
if (userFavoritesKeyString != null) {
Key userFavoritesKey = KeyFactory.stringToKey(userFavoritesKeyString);
returnData = updateFavorite(currentUser, userFavoritesKey, muteNotifications, response);
} else if (testName != null) {
returnData = addFavorite(currentUser, testName, muteNotifications, response);
}
if (returnData != null) {
response.setContentType("application/json");
PrintWriter writer = response.getWriter();
writer.print(new Gson().toJson(returnData));
writer.flush();
}
}
/** Remove a test from the user's favorites. */
@Override
public void doDelete(HttpServletRequest request, HttpServletResponse response)
throws IOException {
DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
String stringKey = request.getPathInfo();
if (stringKey == null) {
response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
return;
}
if (stringKey.startsWith("/")) {
stringKey = stringKey.substring(1);
}
datastore.delete(KeyFactory.stringToKey(stringKey));
response.setStatus(HttpServletResponse.SC_OK);
}
}
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