Index: adblockplussbrowser/src/main/java/org/adblockplus/sbrowser/contentblocker/engine/Notification.java
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+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-present eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.adblockplus.sbrowser.contentblocker.engine;
+
+import java.io.BufferedOutputStream;
+import java.io.DataOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.util.zip.GZIPOutputStream;
+
+import org.adblockplus.adblockplussbrowser.R;
+import org.adblockplus.sbrowser.contentblocker.util.SharedPrefsUtils;
+
+import android.content.Context;
+import android.text.format.DateUtils;
+import android.util.Log;
+
+import javax.net.ssl.HttpsURLConnection;
+
+public class Notification
+{
+  private static final String TAG = Notification.class.getSimpleName();
+  public static final String NOTIFICATION_URL = "https://notification.adblockplus.org/notification.json";
+  public static final String NOTIFICATION_DATA_FILE_NAME = "notification.abp";
+  public static final String KEY_EXTRA_ID = "_extra_id";
+  public static final String KEY_EXTRA_URL = "_extra_url";
+
+  private static final long NOTIFICATION_DOWNLOAD_INTERVAL = DateUtils.DAY_IN_MILLIS;
+  private static final long DOWNLOAD_RETRY_INTERVAL = DateUtils.HOUR_IN_MILLIS;
+
+  public static boolean shouldUpdate(final Context context)
+  {
+    final long now = System.currentTimeMillis();
+    final long lastUpdate = SharedPrefsUtils.getLong(context, R.string.key_last_notification_update_timestamp, 0);
+    final long lastTry = SharedPrefsUtils.getLong(context, R.string.key_last_tried_notification_update_timestamp, 0);
+
+    if (lastTry > lastUpdate)
+    {
+      return now - lastTry > DOWNLOAD_RETRY_INTERVAL;
+    }
+    else
+    {
+      return now - lastUpdate > NOTIFICATION_DOWNLOAD_INTERVAL;
+    }
+  }
+
+  public static void update(final Context context, final int responseCode, final String text,
+      final File notificationDataFile)
+  {
+    if (responseCode != HttpsURLConnection.HTTP_OK || text == null)
+    {
+      SharedPrefsUtils.putLong(context, R.string.key_last_tried_notification_update_timestamp, System.currentTimeMillis());
+    }
+    else
+    {
+      SharedPrefsUtils.putLong(context, R.string.key_last_notification_update_timestamp, System.currentTimeMillis());
+      persistData(notificationDataFile, text);
+    }
+  }
+
+  private static void persistData(final File filtersFile, final String text)
+  {
+    try (final DataOutputStream outputStream = new DataOutputStream(new BufferedOutputStream(
+        new GZIPOutputStream(new FileOutputStream(filtersFile)))))
+    {
+      outputStream.write(text.getBytes());
+    }
+    catch (IOException e)
+    {
+      Log.d(TAG, "Failed to write notification data to internal storage.", e);
+    }
+  }
+}