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      1 /*
      2  * Copyright (C) 2016 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 package android.service.autofill;
     17 
     18 import android.Manifest;
     19 import android.annotation.NonNull;
     20 import android.annotation.Nullable;
     21 import android.app.AppGlobals;
     22 import android.content.ComponentName;
     23 import android.content.pm.PackageManager;
     24 import android.content.pm.ServiceInfo;
     25 import android.content.res.Resources;
     26 import android.content.res.TypedArray;
     27 import android.content.res.XmlResourceParser;
     28 import android.os.RemoteException;
     29 import android.util.AttributeSet;
     30 import android.util.Log;
     31 import android.util.Xml;
     32 
     33 import com.android.internal.R;
     34 
     35 import org.xmlpull.v1.XmlPullParser;
     36 import org.xmlpull.v1.XmlPullParserException;
     37 
     38 import java.io.IOException;
     39 
     40 /**
     41  * {@link ServiceInfo} and meta-data about an {@link AutofillService}.
     42  *
     43  * @hide
     44  */
     45 public final class AutofillServiceInfo {
     46     private static final String TAG = "AutofillServiceInfo";
     47 
     48     private static ServiceInfo getServiceInfoOrThrow(ComponentName comp, int userHandle)
     49             throws PackageManager.NameNotFoundException {
     50         try {
     51             ServiceInfo si = AppGlobals.getPackageManager().getServiceInfo(
     52                     comp,
     53                     PackageManager.GET_META_DATA,
     54                     userHandle);
     55             if (si != null) {
     56                 return si;
     57             }
     58         } catch (RemoteException e) {
     59         }
     60         throw new PackageManager.NameNotFoundException(comp.toString());
     61     }
     62 
     63     @NonNull
     64     private final ServiceInfo mServiceInfo;
     65 
     66     @Nullable
     67     private final String mSettingsActivity;
     68 
     69     public AutofillServiceInfo(PackageManager pm, ComponentName comp, int userHandle)
     70             throws PackageManager.NameNotFoundException {
     71         this(pm, getServiceInfoOrThrow(comp, userHandle));
     72     }
     73 
     74     public AutofillServiceInfo(PackageManager pm, ServiceInfo si) {
     75         mServiceInfo = si;
     76         final TypedArray metaDataArray = getMetaDataArray(pm, si);
     77         if (metaDataArray != null) {
     78             mSettingsActivity = metaDataArray
     79                     .getString(R.styleable.AutofillService_settingsActivity);
     80             metaDataArray.recycle();
     81         } else {
     82             mSettingsActivity = null;
     83         }
     84     }
     85 
     86     /**
     87      * Gets the meta-data as a {@link TypedArray}, or {@code null} if not provided,
     88      * or throws if invalid.
     89      */
     90     @Nullable
     91     private static TypedArray getMetaDataArray(PackageManager pm, ServiceInfo si) {
     92         // Check for permissions.
     93         // TODO(b/37563972): remove support to BIND_AUTOFILL once clients use BIND_AUTOFILL_SERVICE
     94         if (!Manifest.permission.BIND_AUTOFILL_SERVICE.equals(si.permission)
     95                 && !Manifest.permission.BIND_AUTOFILL.equals(si.permission)) {
     96             Log.w(TAG, "AutofillService from '" + si.packageName + "' does not require permission "
     97                     + Manifest.permission.BIND_AUTOFILL_SERVICE);
     98             throw new SecurityException("Service does not require permission "
     99                     + Manifest.permission.BIND_AUTOFILL_SERVICE);
    100         }
    101 
    102         // Get the AutoFill metadata, if declared.
    103         XmlResourceParser parser = si.loadXmlMetaData(pm, AutofillService.SERVICE_META_DATA);
    104         if (parser == null) {
    105             return null;
    106         }
    107 
    108         // Parse service info and get the <autofill-service> tag as an AttributeSet.
    109         AttributeSet attrs;
    110         try {
    111             // Move the XML parser to the first tag.
    112             try {
    113                 int type;
    114                 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT
    115                         && type != XmlPullParser.START_TAG) {
    116                 }
    117             } catch (XmlPullParserException | IOException e) {
    118                 Log.e(TAG, "Error parsing auto fill service meta-data", e);
    119                 return null;
    120             }
    121 
    122             if (!"autofill-service".equals(parser.getName())) {
    123                 Log.e(TAG, "Meta-data does not start with autofill-service tag");
    124                 return null;
    125             }
    126             attrs = Xml.asAttributeSet(parser);
    127 
    128             // Get resources required to read the AttributeSet.
    129             Resources res;
    130             try {
    131                 res = pm.getResourcesForApplication(si.applicationInfo);
    132             } catch (PackageManager.NameNotFoundException e) {
    133                 Log.e(TAG, "Error getting application resources", e);
    134                 return null;
    135             }
    136 
    137             return res.obtainAttributes(attrs, R.styleable.AutofillService);
    138         } finally {
    139             parser.close();
    140         }
    141     }
    142 
    143     public ServiceInfo getServiceInfo() {
    144         return mServiceInfo;
    145     }
    146 
    147     @Nullable
    148     public String getSettingsActivity() {
    149         return mSettingsActivity;
    150     }
    151 
    152     @Override
    153     public String toString() {
    154         return mServiceInfo == null ? "null" : mServiceInfo.toString();
    155     }
    156 }
    157