1 /* 2 * Copyright (C) 2017 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.support.annotation.VisibleForTesting; 21 import android.util.Log; 22 23 import com.android.settingslib.utils.AsyncLoader; 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 LicenseHtmlLoader extends AsyncLoader<File> { 33 private static final String TAG = "LicenseHtmlLoader"; 34 35 private 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 private static final String NOTICE_HTML_FILE_NAME = "NOTICE.html"; 41 42 private Context mContext; 43 LicenseHtmlLoader(Context context)44 public LicenseHtmlLoader(Context context) { 45 super(context); 46 mContext = context; 47 } 48 49 @Override loadInBackground()50 public File loadInBackground() { 51 return generateHtmlFromDefaultXmlFiles(); 52 } 53 54 @Override onDiscardResult(File f)55 protected void onDiscardResult(File f) { 56 } 57 generateHtmlFromDefaultXmlFiles()58 private File generateHtmlFromDefaultXmlFiles() { 59 final List<File> xmlFiles = getVaildXmlFiles(); 60 if (xmlFiles.isEmpty()) { 61 Log.e(TAG, "No notice file exists."); 62 return null; 63 } 64 65 File cachedHtmlFile = getCachedHtmlFile(); 66 if (!isCachedHtmlFileOutdated(xmlFiles, cachedHtmlFile) 67 || generateHtmlFile(xmlFiles, cachedHtmlFile)) { 68 return cachedHtmlFile; 69 } 70 71 return null; 72 } 73 74 @VisibleForTesting getVaildXmlFiles()75 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 86 @VisibleForTesting getCachedHtmlFile()87 File getCachedHtmlFile() { 88 return new File(mContext.getCacheDir(), NOTICE_HTML_FILE_NAME); 89 } 90 91 @VisibleForTesting isCachedHtmlFileOutdated(List<File> xmlFiles, File cachedHtmlFile)92 boolean isCachedHtmlFileOutdated(List<File> xmlFiles, File cachedHtmlFile) { 93 boolean outdated = true; 94 if (cachedHtmlFile.exists() && cachedHtmlFile.length() != 0) { 95 outdated = false; 96 for (File file : xmlFiles) { 97 if (cachedHtmlFile.lastModified() < file.lastModified()) { 98 outdated = true; 99 break; 100 } 101 } 102 } 103 return outdated; 104 } 105 106 @VisibleForTesting generateHtmlFile(List<File> xmlFiles, File htmlFile)107 boolean generateHtmlFile(List<File> xmlFiles, File htmlFile) { 108 return LicenseHtmlGeneratorFromXml.generateHtml(xmlFiles, htmlFile); 109 } 110 } 111