1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.settingslib.license; 18 19 import android.content.Context; 20 import android.util.Log; 21 22 import com.android.settingslib.R; 23 import com.android.settingslib.utils.AsyncLoaderCompat; 24 25 import java.io.File; 26 import java.util.ArrayList; 27 import java.util.List; 28 29 /** 30 * LicenseHtmlLoader is a loader which loads a license html file from default license xml files. 31 */ 32 public class LicenseHtmlLoaderCompat extends AsyncLoaderCompat<File> { 33 private static final String TAG = "LicenseHtmlLoaderCompat"; 34 35 static final String[] DEFAULT_LICENSE_XML_PATHS = { 36 "/system/etc/NOTICE.xml.gz", 37 "/vendor/etc/NOTICE.xml.gz", 38 "/odm/etc/NOTICE.xml.gz", 39 "/oem/etc/NOTICE.xml.gz", 40 "/product/etc/NOTICE.xml.gz", 41 "/product_services/etc/NOTICE.xml.gz"}; 42 static final String NOTICE_HTML_FILE_NAME = "NOTICE.html"; 43 44 private final Context mContext; 45 LicenseHtmlLoaderCompat(Context context)46 public LicenseHtmlLoaderCompat(Context context) { 47 super(context); 48 mContext = context; 49 } 50 51 @Override loadInBackground()52 public File loadInBackground() { 53 return generateHtmlFromDefaultXmlFiles(); 54 } 55 56 @Override onDiscardResult(File f)57 protected void onDiscardResult(File f) { 58 } 59 generateHtmlFromDefaultXmlFiles()60 private File generateHtmlFromDefaultXmlFiles() { 61 final List<File> xmlFiles = getVaildXmlFiles(); 62 if (xmlFiles.isEmpty()) { 63 Log.e(TAG, "No notice file exists."); 64 return null; 65 } 66 67 File cachedHtmlFile = getCachedHtmlFile(mContext); 68 if (!isCachedHtmlFileOutdated(xmlFiles, cachedHtmlFile) 69 || generateHtmlFile(mContext, xmlFiles, cachedHtmlFile)) { 70 return cachedHtmlFile; 71 } 72 73 return null; 74 } 75 getVaildXmlFiles()76 private List<File> getVaildXmlFiles() { 77 final List<File> xmlFiles = new ArrayList(); 78 for (final String xmlPath : DEFAULT_LICENSE_XML_PATHS) { 79 File file = new File(xmlPath); 80 if (file.exists() && file.length() != 0) { 81 xmlFiles.add(file); 82 } 83 } 84 return xmlFiles; 85 } 86 getCachedHtmlFile(Context context)87 private File getCachedHtmlFile(Context context) { 88 return new File(context.getCacheDir(), NOTICE_HTML_FILE_NAME); 89 } 90 isCachedHtmlFileOutdated(List<File> xmlFiles, File cachedHtmlFile)91 private boolean isCachedHtmlFileOutdated(List<File> xmlFiles, File cachedHtmlFile) { 92 boolean outdated = true; 93 if (cachedHtmlFile.exists() && cachedHtmlFile.length() != 0) { 94 outdated = false; 95 for (File file : xmlFiles) { 96 if (cachedHtmlFile.lastModified() < file.lastModified()) { 97 outdated = true; 98 break; 99 } 100 } 101 } 102 return outdated; 103 } 104 generateHtmlFile(Context context, List<File> xmlFiles, File htmlFile)105 private boolean generateHtmlFile(Context context, List<File> xmlFiles, File htmlFile) { 106 return LicenseHtmlGeneratorFromXml.generateHtml(xmlFiles, htmlFile, 107 context.getString(R.string.notice_header)); 108 } 109 } 110