1 /* 2 * Copyright (C) 2022 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.ondevicepersonalization.services.manifest; 18 19 import android.content.res.XmlResourceParser; 20 import android.util.Log; 21 22 import org.xmlpull.v1.XmlPullParser; 23 import org.xmlpull.v1.XmlPullParserException; 24 25 import java.io.IOException; 26 27 /** Parser and validator for OnDevicePersonalization app manifest configs. */ 28 public class AppManifestConfigParser { 29 private static final String TAG = "AppManifestConfigParser"; 30 private static final String TAG_ON_DEVICE_PERSONALIZATION_CONFIG = "on-device-personalization"; 31 private static final String TAG_DOWNLOAD_SETTINGS = "download-settings"; 32 private static final String TAG_SERVICE = "service"; 33 private static final String ATTR_DOWNLOAD_URL = "url"; 34 private static final String ATTR_NAME = "name"; 35 AppManifestConfigParser()36 private AppManifestConfigParser() { 37 } 38 39 /** 40 * Parses and validates given XML resource 41 * 42 * @param parser the XmlParser representing the OnDevicePersonalization app manifest config 43 */ getConfig(XmlResourceParser parser)44 public static AppManifestConfig getConfig(XmlResourceParser parser) throws IOException, 45 XmlPullParserException { 46 String downloadUrl = null; 47 String serviceName = null; 48 49 // The first next goes to START_DOCUMENT, so we need another next to go to START_TAG. 50 parser.next(); 51 parser.next(); 52 parser.require(XmlPullParser.START_TAG, null, TAG_ON_DEVICE_PERSONALIZATION_CONFIG); 53 parser.next(); 54 55 // Walk through the config to parse required values. 56 while (parser.getEventType() != XmlResourceParser.END_DOCUMENT) { 57 if (parser.getEventType() != XmlResourceParser.START_TAG) { 58 parser.next(); 59 continue; 60 } 61 switch (parser.getName()) { 62 case TAG_DOWNLOAD_SETTINGS: 63 downloadUrl = parser.getAttributeValue(null, ATTR_DOWNLOAD_URL); 64 break; 65 case TAG_SERVICE: 66 serviceName = parser.getAttributeValue(null, ATTR_NAME); 67 break; 68 default: 69 Log.i(TAG, "Unknown tag: " + parser.getName()); 70 } 71 parser.next(); 72 } 73 74 return new AppManifestConfig(downloadUrl, serviceName); 75 } 76 } 77