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 "/system_ext/etc/NOTICE.xml.gz", 42 "/vendor_dlkm/etc/NOTICE.xml.gz", 43 "/odm_dlkm/etc/NOTICE.xml.gz", 44 "/system_dlkm/etc/NOTICE.xml.gz", 45 }; 46 static final String NOTICE_HTML_FILE_NAME = "NOTICE.html"; 47 48 private final Context mContext; 49 LicenseHtmlLoaderCompat(Context context)50 public LicenseHtmlLoaderCompat(Context context) { 51 super(context); 52 mContext = context; 53 } 54 55 @Override loadInBackground()56 public File loadInBackground() { 57 return generateHtmlFromDefaultXmlFiles(); 58 } 59 60 @Override onDiscardResult(File f)61 protected void onDiscardResult(File f) { 62 } 63 generateHtmlFromDefaultXmlFiles()64 private File generateHtmlFromDefaultXmlFiles() { 65 final List<File> xmlFiles = getVaildXmlFiles(); 66 if (xmlFiles.isEmpty()) { 67 Log.e(TAG, "No notice file exists."); 68 return null; 69 } 70 71 File cachedHtmlFile = getCachedHtmlFile(mContext); 72 if (!isCachedHtmlFileOutdated(xmlFiles, cachedHtmlFile) 73 || generateHtmlFile(mContext, xmlFiles, cachedHtmlFile)) { 74 return cachedHtmlFile; 75 } 76 77 return null; 78 } 79 getVaildXmlFiles()80 private List<File> getVaildXmlFiles() { 81 final List<File> xmlFiles = new ArrayList(); 82 for (final String xmlPath : DEFAULT_LICENSE_XML_PATHS) { 83 File file = new File(xmlPath); 84 if (file.exists() && file.length() != 0) { 85 xmlFiles.add(file); 86 } 87 } 88 return xmlFiles; 89 } 90 getCachedHtmlFile(Context context)91 private File getCachedHtmlFile(Context context) { 92 return new File(context.getCacheDir(), NOTICE_HTML_FILE_NAME); 93 } 94 isCachedHtmlFileOutdated(List<File> xmlFiles, File cachedHtmlFile)95 private boolean isCachedHtmlFileOutdated(List<File> xmlFiles, File cachedHtmlFile) { 96 boolean outdated = true; 97 if (cachedHtmlFile.exists() && cachedHtmlFile.length() != 0) { 98 outdated = false; 99 for (File file : xmlFiles) { 100 if (cachedHtmlFile.lastModified() < file.lastModified()) { 101 outdated = true; 102 break; 103 } 104 } 105 } 106 return outdated; 107 } 108 generateHtmlFile(Context context, List<File> xmlFiles, File htmlFile)109 private boolean generateHtmlFile(Context context, List<File> xmlFiles, File htmlFile) { 110 return LicenseHtmlGeneratorFromXml.generateHtml(xmlFiles, htmlFile, 111 context.getString(R.string.notice_header)); 112 } 113 } 114