| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * 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.tools.analytics; |
| |
| import com.android.annotations.NonNull; |
| import com.android.annotations.Nullable; |
| import com.android.utils.ILogger; |
| import com.google.common.base.Charsets; |
| import com.google.common.base.Strings; |
| import com.google.common.hash.Hasher; |
| import com.google.common.hash.Hashing; |
| |
| import java.io.IOException; |
| import java.nio.charset.Charset; |
| |
| /** |
| * Anonymizes strings for analytics reporting. Each string is sha256 encoded with a salt that is |
| * unique per user and rotated every 28 days with a predictable time window. |
| */ |
| public class Anonymizer { |
| /** Anonymizes a utf8 string. Logs any issues reading the salt for anonymizing. */ |
| public static String anonymizeUtf8(@NonNull ILogger logger, @NonNull String data) |
| throws IOException { |
| return anonymize(logger, data, Charsets.UTF_8); |
| } |
| |
| /** |
| * Anonymizes a string based on provided charset. Logs any issues reading the salt for |
| * anonymizing. |
| */ |
| public static String anonymize( |
| @NonNull ILogger logger, @NonNull String data, @NonNull Charset charset) |
| throws IOException { |
| if (Strings.isNullOrEmpty(data)) { |
| return ""; |
| } |
| Hasher hasher = Hashing.sha256().newHasher(); |
| hasher.putBytes(AnalyticsSettings.getInstance(logger).getSalt()); |
| hasher.putString(data, charset); |
| return hasher.hash().toString(); |
| } |
| } |