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.car.settings.system; 18 19 import android.content.Context; 20 21 import com.android.car.settings.common.AsyncLoader; 22 import com.android.car.settings.common.Logger; 23 24 import java.io.File; 25 import java.util.ArrayList; 26 import java.util.List; 27 28 /** 29 * LicenseHtmlLoader is a loader which loads a license html file from default license xml files. 30 */ 31 public class LicenseHtmlLoader extends AsyncLoader<File> { 32 private static final Logger LOG = new Logger(LicenseHtmlLoader.class); 33 34 private static final String[] DEFAULT_LICENSE_XML_PATHS = { 35 "/system/etc/NOTICE.xml.gz", 36 "/vendor/etc/NOTICE.xml.gz", 37 "/odm/etc/NOTICE.xml.gz", 38 "/oem/etc/NOTICE.xml.gz", 39 "/product/etc/NOTICE.xml.gz", 40 "/system_ext/etc/NOTICE.xml.gz", 41 "/vendor_dlkm/etc/NOTICE.xml.gz", 42 "/odm_dlkm/etc/NOTICE.xml.gz", 43 }; 44 45 private static final String NOTICE_HTML_FILE_NAME = "NOTICE.html"; 46 47 private final Context mContext; 48 LicenseHtmlLoader(Context context)49 public LicenseHtmlLoader(Context context) { 50 super(context); 51 mContext = context; 52 } 53 54 @Override loadInBackground()55 public File loadInBackground() { 56 return generateHtmlFromDefaultXmlFiles(); 57 } 58 generateHtmlFromDefaultXmlFiles()59 private File generateHtmlFromDefaultXmlFiles() { 60 final List<File> xmlFiles = getVaildXmlFiles(); 61 if (xmlFiles.isEmpty()) { 62 LOG.e("No notice file exists."); 63 return null; 64 } 65 66 File cachedHtmlFile = getCachedHtmlFile(); 67 if (!isCachedHtmlFileOutdated(xmlFiles, cachedHtmlFile) 68 || generateHtmlFile(xmlFiles, cachedHtmlFile)) { 69 return cachedHtmlFile; 70 } 71 72 return null; 73 } 74 getVaildXmlFiles()75 private List<File> getVaildXmlFiles() { 76 final List<File> xmlFiles = new ArrayList(); 77 for (final String xmlPath : DEFAULT_LICENSE_XML_PATHS) { 78 File file = new File(xmlPath); 79 if (file.exists() && file.length() != 0) { 80 xmlFiles.add(file); 81 } 82 } 83 return xmlFiles; 84 } 85 getCachedHtmlFile()86 private File getCachedHtmlFile() { 87 return new File(mContext.getCacheDir(), NOTICE_HTML_FILE_NAME); 88 } 89 isCachedHtmlFileOutdated(List<File> xmlFiles, File cachedHtmlFile)90 private boolean isCachedHtmlFileOutdated(List<File> xmlFiles, File cachedHtmlFile) { 91 boolean outdated = true; 92 if (cachedHtmlFile.exists() && cachedHtmlFile.length() != 0) { 93 outdated = false; 94 for (File file : xmlFiles) { 95 if (cachedHtmlFile.lastModified() < file.lastModified()) { 96 outdated = true; 97 break; 98 } 99 } 100 } 101 return outdated; 102 } 103 generateHtmlFile(List<File> xmlFiles, File htmlFile)104 private boolean generateHtmlFile(List<File> xmlFiles, File htmlFile) { 105 return LicenseHtmlGeneratorFromXml.generateHtml(xmlFiles, htmlFile); 106 } 107 } 108 109 110