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/*
* Copyright (C) 2014 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.keyguard.analytics;
import android.os.Build;
import android.util.Slog;
import android.view.MotionEvent;
import java.util.ArrayList;
import static com.android.keyguard.analytics.KeyguardAnalyticsProtos.Session.SensorEvent;
import static com.android.keyguard.analytics.KeyguardAnalyticsProtos.Session.TouchEvent;
/**
* Records data about one keyguard session.
*
* The recorded data contains start and end of the session, whether it unlocked the device
* successfully, sensor data and touch data.
*
* If the keyguard is secure, the recorded touch data will correlate or contain the user pattern or
* PIN. If this is not desired, the touch coordinates can be redacted before serialization.
*/
public class Session {
private static final String TAG = "KeyguardAnalytics";
private static final boolean DEBUG = false;
/**
* The user has failed to unlock the device in this session.
*/
public static final int RESULT_FAILURE = KeyguardAnalyticsProtos.Session.FAILURE;
/**
* The user has succeeded in unlocking the device in this session.
*/
public static final int RESULT_SUCCESS = KeyguardAnalyticsProtos.Session.SUCCESS;
/**
* It is unknown how the session with the keyguard ended.
*/
public static final int RESULT_UNKNOWN = KeyguardAnalyticsProtos.Session.UNKNOWN;
/**
* This session took place on an insecure keyguard.
*/
public static final int TYPE_KEYGUARD_INSECURE
= KeyguardAnalyticsProtos.Session.KEYGUARD_INSECURE;
/**
* This session took place on an secure keyguard.
*/
public static final int TYPE_KEYGUARD_SECURE
= KeyguardAnalyticsProtos.Session.KEYGUARD_SECURE;
/**
* This session took place during a fake wake up of the device.
*/
public static final int TYPE_RANDOM_WAKEUP = KeyguardAnalyticsProtos.Session.RANDOM_WAKEUP;
private final PointerTracker mPointerTracker = new PointerTracker();
private final long mStartTimestampMillis;
private final long mStartSystemTimeNanos;
private final int mType;
private boolean mRedactTouchEvents;
private ArrayList<TouchEvent> mMotionEvents = new ArrayList<TouchEvent>(200);
private ArrayList<SensorEvent> mSensorEvents = new ArrayList<SensorEvent>(600);
private int mTouchAreaHeight;
private int mTouchAreaWidth;
private long mEndTimestampMillis;
private int mResult;
private boolean mEnded;
public Session(long startTimestampMillis, long startSystemTimeNanos, int type) {
mStartTimestampMillis = startTimestampMillis;
mStartSystemTimeNanos = startSystemTimeNanos;
mType = type;
}
public void end(long endTimestampMillis, int result) {
mEnded = true;
mEndTimestampMillis = endTimestampMillis;
mResult = result;
}
public void addMotionEvent(MotionEvent motionEvent) {
if (mEnded) {
return;
}
mPointerTracker.addMotionEvent(motionEvent);
mMotionEvents.add(protoFromMotionEvent(motionEvent));
}
public void addSensorEvent(android.hardware.SensorEvent eventOrig, long systemTimeNanos) {
if (mEnded) {
return;
}
SensorEvent event = protoFromSensorEvent(eventOrig, systemTimeNanos);
mSensorEvents.add(event);
if (DEBUG) {
Slog.v(TAG, String.format("addSensorEvent(name=%s, values[0]=%f",
event.getType(), event.values[0]));
}
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder("Session{");
sb.append("mType=").append(mType);
sb.append(", mStartTimestampMillis=").append(mStartTimestampMillis);
sb.append(", mStartSystemTimeNanos=").append(mStartSystemTimeNanos);
sb.append(", mEndTimestampMillis=").append(mEndTimestampMillis);
sb.append(", mResult=").append(mResult);
sb.append(", mRedactTouchEvents=").append(mRedactTouchEvents);
sb.append(", mTouchAreaHeight=").append(mTouchAreaHeight);
sb.append(", mTouchAreaWidth=").append(mTouchAreaWidth);
sb.append(", mMotionEvents=[size=").append(mMotionEvents.size()).append("]");
sb.append(", mSensorEvents=[size=").append(mSensorEvents.size()).append("]");
sb.append('}');
return sb.toString();
}
public KeyguardAnalyticsProtos.Session toProto() {
KeyguardAnalyticsProtos.Session proto = new KeyguardAnalyticsProtos.Session();
proto.setStartTimestampMillis(mStartTimestampMillis);
proto.setDurationMillis(mEndTimestampMillis - mStartTimestampMillis);
proto.setBuild(Build.FINGERPRINT);
proto.setResult(mResult);
proto.sensorEvents = mSensorEvents.toArray(proto.sensorEvents);
proto.touchEvents = mMotionEvents.toArray(proto.touchEvents);
proto.setTouchAreaWidth(mTouchAreaWidth);
proto.setTouchAreaHeight(mTouchAreaHeight);
proto.setType(mType);
if (mRedactTouchEvents) {
redactTouchEvents(proto.touchEvents);
}
return proto;
}
private void redactTouchEvents(TouchEvent[] touchEvents) {
for (int i = 0; i < touchEvents.length; i++) {
TouchEvent t = touchEvents[i];
for (int j = 0; j < t.pointers.length; j++) {
TouchEvent.Pointer p = t.pointers[j];
p.clearX();
p.clearY();
}
t.setRedacted(true);
}
}
private SensorEvent protoFromSensorEvent(android.hardware.SensorEvent ev, long sysTimeNanos) {
SensorEvent proto = new SensorEvent();
proto.setType(ev.sensor.getType());
proto.setTimeOffsetNanos(sysTimeNanos - mStartSystemTimeNanos);
proto.setTimestamp(ev.timestamp);
proto.values = ev.values.clone();
return proto;
}
private TouchEvent protoFromMotionEvent(MotionEvent ev) {
int count = ev.getPointerCount();
TouchEvent proto = new TouchEvent();
proto.setTimeOffsetNanos(ev.getEventTimeNano() - mStartSystemTimeNanos);
proto.setAction(ev.getActionMasked());
proto.setActionIndex(ev.getActionIndex());
proto.pointers = new TouchEvent.Pointer[count];
for (int i = 0; i < count; i++) {
TouchEvent.Pointer p = new TouchEvent.Pointer();
p.setX(ev.getX(i));
p.setY(ev.getY(i));
p.setSize(ev.getSize(i));
p.setPressure(ev.getPressure(i));
p.setId(ev.getPointerId(i));
proto.pointers[i] = p;
if ((ev.getActionMasked() == MotionEvent.ACTION_POINTER_UP && ev.getActionIndex() == i)
|| ev.getActionMasked() == MotionEvent.ACTION_UP) {
p.boundingBox = mPointerTracker.getPointerBoundingBox(p.getId());
p.setLength(mPointerTracker.getPointerLength(p.getId()));
}
}
if (ev.getActionMasked() == MotionEvent.ACTION_UP) {
proto.boundingBox = mPointerTracker.getBoundingBox();
}
return proto;
}
/**
* Discards the x / y coordinates of the touch events on serialization. Retained are the
* size of the individual and overall bounding boxes and the length of each pointer's gesture.
*/
public void setRedactTouchEvents() {
mRedactTouchEvents = true;
}
public void setTouchArea(int width, int height) {
mTouchAreaWidth = width;
mTouchAreaHeight = height;
}
public long getStartTimestampMillis() {
return mStartTimestampMillis;
}
}
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