| /* |
| * Copyright (C) 2015 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.fingerprint; |
| |
| import android.content.Context; |
| import android.hardware.fingerprint.Fingerprint; |
| import android.os.AsyncTask; |
| import android.os.Environment; |
| import android.util.AtomicFile; |
| import android.util.Slog; |
| import android.util.Xml; |
| |
| import com.android.internal.annotations.GuardedBy; |
| |
| import libcore.io.IoUtils; |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| import org.xmlpull.v1.XmlSerializer; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Class managing the set of fingerprint per user across device reboots. |
| */ |
| class FingerprintsUserState { |
| |
| private static final String TAG = "FingerprintState"; |
| private static final String FINGERPRINT_FILE = "settings_fingerprint.xml"; |
| |
| private static final String TAG_FINGERPRINTS = "fingerprints"; |
| private static final String TAG_FINGERPRINT = "fingerprint"; |
| private static final String ATTR_NAME = "name"; |
| private static final String ATTR_GROUP_ID = "groupId"; |
| private static final String ATTR_FINGER_ID = "fingerId"; |
| private static final String ATTR_DEVICE_ID = "deviceId"; |
| |
| private final File mFile; |
| |
| @GuardedBy("this") |
| private final ArrayList<Fingerprint> mFingerprints = new ArrayList<Fingerprint>(); |
| private final Context mCtx; |
| |
| public FingerprintsUserState(Context ctx, int userId) { |
| mFile = getFileForUser(userId); |
| mCtx = ctx; |
| synchronized (this) { |
| readStateSyncLocked(); |
| } |
| } |
| |
| public void addFingerprint(int fingerId, int groupId) { |
| synchronized (this) { |
| mFingerprints.add(new Fingerprint(getUniqueName(), groupId, fingerId, 0)); |
| scheduleWriteStateLocked(); |
| } |
| } |
| |
| public void removeFingerprint(int fingerId) { |
| synchronized (this) { |
| for (int i = 0; i < mFingerprints.size(); i++) { |
| if (mFingerprints.get(i).getFingerId() == fingerId) { |
| mFingerprints.remove(i); |
| scheduleWriteStateLocked(); |
| break; |
| } |
| } |
| } |
| } |
| |
| public void renameFingerprint(int fingerId, CharSequence name) { |
| synchronized (this) { |
| for (int i = 0; i < mFingerprints.size(); i++) { |
| if (mFingerprints.get(i).getFingerId() == fingerId) { |
| Fingerprint old = mFingerprints.get(i); |
| mFingerprints.set(i, new Fingerprint(name, old.getGroupId(), old.getFingerId(), |
| old.getDeviceId())); |
| scheduleWriteStateLocked(); |
| break; |
| } |
| } |
| } |
| } |
| |
| public List<Fingerprint> getFingerprints() { |
| synchronized (this) { |
| return getCopy(mFingerprints); |
| } |
| } |
| |
| /** |
| * Finds a unique name for the given fingerprint |
| * @return unique name |
| */ |
| private String getUniqueName() { |
| int guess = 1; |
| while (true) { |
| // Not the most efficient algorithm in the world, but there shouldn't be more than 10 |
| String name = mCtx.getString(com.android.internal.R.string.fingerprint_name_template, |
| guess); |
| if (isUnique(name)) { |
| return name; |
| } |
| guess++; |
| } |
| } |
| |
| private boolean isUnique(String name) { |
| for (Fingerprint fp : mFingerprints) { |
| if (fp.getName().equals(name)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| private static File getFileForUser(int userId) { |
| return new File(Environment.getUserSystemDirectory(userId), FINGERPRINT_FILE); |
| } |
| |
| private final Runnable mWriteStateRunnable = new Runnable() { |
| @Override |
| public void run() { |
| doWriteState(); |
| } |
| }; |
| |
| private void scheduleWriteStateLocked() { |
| AsyncTask.execute(mWriteStateRunnable); |
| } |
| |
| private ArrayList<Fingerprint> getCopy(ArrayList<Fingerprint> array) { |
| ArrayList<Fingerprint> result = new ArrayList<Fingerprint>(array.size()); |
| for (int i = 0; i < array.size(); i++) { |
| Fingerprint fp = array.get(i); |
| result.add(new Fingerprint(fp.getName(), fp.getGroupId(), fp.getFingerId(), |
| fp.getDeviceId())); |
| } |
| return result; |
| } |
| |
| private void doWriteState() { |
| AtomicFile destination = new AtomicFile(mFile); |
| |
| ArrayList<Fingerprint> fingerprints; |
| |
| synchronized (this) { |
| fingerprints = getCopy(mFingerprints); |
| } |
| |
| 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_FINGERPRINTS); |
| |
| final int count = fingerprints.size(); |
| for (int i = 0; i < count; i++) { |
| Fingerprint fp = fingerprints.get(i); |
| serializer.startTag(null, TAG_FINGERPRINT); |
| serializer.attribute(null, ATTR_FINGER_ID, Integer.toString(fp.getFingerId())); |
| serializer.attribute(null, ATTR_NAME, fp.getName().toString()); |
| serializer.attribute(null, ATTR_GROUP_ID, Integer.toString(fp.getGroupId())); |
| serializer.attribute(null, ATTR_DEVICE_ID, Long.toString(fp.getDeviceId())); |
| serializer.endTag(null, TAG_FINGERPRINT); |
| } |
| |
| serializer.endTag(null, TAG_FINGERPRINTS); |
| 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 fingerprints", t); |
| } finally { |
| IoUtils.closeQuietly(out); |
| } |
| } |
| |
| @GuardedBy("this") |
| private void readStateSyncLocked() { |
| FileInputStream in; |
| if (!mFile.exists()) { |
| return; |
| } |
| try { |
| in = new FileInputStream(mFile); |
| } catch (FileNotFoundException fnfe) { |
| Slog.i(TAG, "No fingerprint state"); |
| return; |
| } |
| try { |
| XmlPullParser parser = Xml.newPullParser(); |
| parser.setInput(in, null); |
| parseStateLocked(parser); |
| |
| } catch (XmlPullParserException | IOException e) { |
| throw new IllegalStateException("Failed parsing settings file: " |
| + mFile , e); |
| } finally { |
| IoUtils.closeQuietly(in); |
| } |
| } |
| |
| @GuardedBy("this") |
| private void parseStateLocked(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_FINGERPRINTS)) { |
| parseFingerprintsLocked(parser); |
| } |
| } |
| } |
| |
| @GuardedBy("this") |
| private void parseFingerprintsLocked(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_FINGERPRINT)) { |
| String name = parser.getAttributeValue(null, ATTR_NAME); |
| String groupId = parser.getAttributeValue(null, ATTR_GROUP_ID); |
| String fingerId = parser.getAttributeValue(null, ATTR_FINGER_ID); |
| String deviceId = parser.getAttributeValue(null, ATTR_DEVICE_ID); |
| mFingerprints.add(new Fingerprint(name, Integer.parseInt(groupId), |
| Integer.parseInt(fingerId), Integer.parseInt(deviceId))); |
| } |
| } |
| } |
| |
| } |