| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License |
| */ |
| |
| package com.android.server.biometrics.face; |
| |
| import android.content.Context; |
| import android.hardware.biometrics.BiometricAuthenticator; |
| import android.hardware.face.Face; |
| import android.util.AtomicFile; |
| import android.util.Slog; |
| import android.util.Xml; |
| |
| import com.android.internal.annotations.GuardedBy; |
| import com.android.server.biometrics.BiometricUserState; |
| |
| import libcore.io.IoUtils; |
| |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| import org.xmlpull.v1.XmlSerializer; |
| |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| |
| |
| /** |
| * Class managing the set of faces per user across device reboots. |
| * @hide |
| */ |
| public class FaceUserState extends BiometricUserState { |
| |
| private static final String TAG = "FaceState"; |
| private static final String FACE_FILE = "settings_face.xml"; |
| |
| private static final String TAG_FACES = "faces"; |
| private static final String TAG_FACE = "face"; |
| private static final String ATTR_NAME = "name"; |
| private static final String ATTR_FACE_ID = "faceId"; |
| private static final String ATTR_DEVICE_ID = "deviceId"; |
| |
| public FaceUserState(Context ctx, int userId) { |
| super(ctx, userId); |
| } |
| |
| @Override |
| protected String getBiometricsTag() { |
| return TAG_FACES; |
| } |
| |
| @Override |
| protected String getBiometricFile() { |
| return FACE_FILE; |
| } |
| |
| @Override |
| protected int getNameTemplateResource() { |
| return com.android.internal.R.string.face_name_template; |
| } |
| |
| @Override |
| public void addBiometric(BiometricAuthenticator.Identifier identifier) { |
| if (identifier instanceof Face) { |
| super.addBiometric(identifier); |
| } else { |
| Slog.w(TAG, "Attempted to add non-face identifier"); |
| } |
| } |
| |
| @Override |
| protected ArrayList getCopy(ArrayList array) { |
| ArrayList<Face> result = new ArrayList<>(array.size()); |
| for (int i = 0; i < array.size(); i++) { |
| Face f = (Face) array.get(i); |
| result.add(new Face(f.getName(), f.getBiometricId(), f.getDeviceId())); |
| } |
| return result; |
| } |
| |
| @Override |
| protected void doWriteState() { |
| AtomicFile destination = new AtomicFile(mFile); |
| |
| ArrayList<Face> faces; |
| |
| synchronized (this) { |
| faces = getCopy(mBiometrics); |
| } |
| |
| FileOutputStream out = null; |
| try { |
| out = destination.startWrite(); |
| |
| XmlSerializer serializer = Xml.newSerializer(); |
| serializer.setOutput(out, "utf-8"); |
| serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); |
| serializer.startDocument(null, true); |
| serializer.startTag(null, TAG_FACES); |
| |
| final int count = faces.size(); |
| for (int i = 0; i < count; i++) { |
| Face f = faces.get(i); |
| serializer.startTag(null, TAG_FACE); |
| serializer.attribute(null, ATTR_FACE_ID, Integer.toString(f.getBiometricId())); |
| serializer.attribute(null, ATTR_NAME, f.getName().toString()); |
| serializer.attribute(null, ATTR_DEVICE_ID, Long.toString(f.getDeviceId())); |
| serializer.endTag(null, TAG_FACE); |
| } |
| |
| serializer.endTag(null, TAG_FACES); |
| serializer.endDocument(); |
| destination.finishWrite(out); |
| |
| // Any error while writing is fatal. |
| } catch (Throwable t) { |
| Slog.wtf(TAG, "Failed to write settings, restoring backup", t); |
| destination.failWrite(out); |
| throw new IllegalStateException("Failed to write faces", t); |
| } finally { |
| IoUtils.closeQuietly(out); |
| } |
| } |
| |
| @GuardedBy("this") |
| @Override |
| protected void parseBiometricsLocked(XmlPullParser parser) |
| throws IOException, XmlPullParserException { |
| final int outerDepth = parser.getDepth(); |
| int type; |
| while ((type = parser.next()) != XmlPullParser.END_DOCUMENT |
| && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) { |
| if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { |
| continue; |
| } |
| |
| String tagName = parser.getName(); |
| if (tagName.equals(TAG_FACE)) { |
| String name = parser.getAttributeValue(null, ATTR_NAME); |
| String faceId = parser.getAttributeValue(null, ATTR_FACE_ID); |
| String deviceId = parser.getAttributeValue(null, ATTR_DEVICE_ID); |
| mBiometrics.add(new Face(name, Integer.parseInt(faceId), Integer.parseInt(deviceId))); |
| } |
| } |
| } |
| } |