auto import from //depot/cupcake/@135843
diff --git a/core/java/com/android/internal/widget/LockPatternUtils.java b/core/java/com/android/internal/widget/LockPatternUtils.java
new file mode 100644
index 0000000..c8b3ad4
--- /dev/null
+++ b/core/java/com/android/internal/widget/LockPatternUtils.java
@@ -0,0 +1,359 @@
+/*
+ * Copyright (C) 2007 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.internal.widget;
+
+import android.content.ContentResolver;
+import android.os.SystemClock;
+import android.provider.Settings;
+import android.security.MessageDigest;
+import android.text.TextUtils;
+import android.util.Log;
+
+import com.google.android.collect.Lists;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.security.NoSuchAlgorithmException;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Utilities for the lock patten and its settings.
+ */
+public class LockPatternUtils {
+
+ private static final String TAG = "LockPatternUtils";
+
+ private static final String LOCK_PATTERN_FILE = "/system/gesture.key";
+
+ /**
+ * The maximum number of incorrect attempts before the user is prevented
+ * from trying again for {@link #FAILED_ATTEMPT_TIMEOUT_MS}.
+ */
+ public static final int FAILED_ATTEMPTS_BEFORE_TIMEOUT = 5;
+
+ /**
+ * The number of incorrect attempts before which we fall back on an alternative
+ * method of verifying the user, and resetting their lock pattern.
+ */
+ public static final int FAILED_ATTEMPTS_BEFORE_RESET = 20;
+
+ /**
+ * How long the user is prevented from trying again after entering the
+ * wrong pattern too many times.
+ */
+ public static final long FAILED_ATTEMPT_TIMEOUT_MS = 30000L;
+
+ /**
+ * The interval of the countdown for showing progress of the lockout.
+ */
+ public static final long FAILED_ATTEMPT_COUNTDOWN_INTERVAL_MS = 1000L;
+
+ /**
+ * The minimum number of dots in a valid pattern.
+ */
+ public static final int MIN_LOCK_PATTERN_SIZE = 4;
+
+ /**
+ * The minimum number of dots the user must include in a wrong pattern
+ * attempt for it to be counted against the counts that affect
+ * {@link #FAILED_ATTEMPTS_BEFORE_TIMEOUT} and {@link #FAILED_ATTEMPTS_BEFORE_RESET}
+ */
+ public static final int MIN_PATTERN_REGISTER_FAIL = 3;
+
+ private final static String LOCKOUT_PERMANENT_KEY = "lockscreen.lockedoutpermanently";
+ private final static String LOCKOUT_ATTEMPT_DEADLINE = "lockscreen.lockoutattemptdeadline";
+
+ private final ContentResolver mContentResolver;
+
+ private static String sLockPatternFilename;
+
+ /**
+ * @param contentResolver Used to look up and save settings.
+ */
+ public LockPatternUtils(ContentResolver contentResolver) {
+ mContentResolver = contentResolver;
+ // Initialize the location of gesture lock file
+ if (sLockPatternFilename == null) {
+ sLockPatternFilename = android.os.Environment.getDataDirectory()
+ .getAbsolutePath() + LOCK_PATTERN_FILE;
+ }
+ }
+
+ /**
+ * Check to see if a pattern matches the saved pattern. If no pattern exists,
+ * always returns true.
+ * @param pattern The pattern to check.
+ * @return Whether the pattern matchees the stored one.
+ */
+ public boolean checkPattern(List<LockPatternView.Cell> pattern) {
+ try {
+ // Read all the bytes from the file
+ RandomAccessFile raf = new RandomAccessFile(sLockPatternFilename, "r");
+ final byte[] stored = new byte[(int) raf.length()];
+ int got = raf.read(stored, 0, stored.length);
+ raf.close();
+ if (got <= 0) {
+ return true;
+ }
+ // Compare the hash from the file with the entered pattern's hash
+ return Arrays.equals(stored, LockPatternUtils.patternToHash(pattern));
+ } catch (FileNotFoundException fnfe) {
+ return true;
+ } catch (IOException ioe) {
+ return true;
+ }
+ }
+
+ /**
+ * Check to see if the user has stored a lock pattern.
+ * @return Whether a saved pattern exists.
+ */
+ public boolean savedPatternExists() {
+ try {
+ // Check if we can read a byte from the file
+ RandomAccessFile raf = new RandomAccessFile(sLockPatternFilename, "r");
+ byte first = raf.readByte();
+ raf.close();
+ return true;
+ } catch (FileNotFoundException fnfe) {
+ return false;
+ } catch (IOException ioe) {
+ return false;
+ }
+ }
+
+ /**
+ * Save a lock pattern.
+ * @param pattern The new pattern to save.
+ */
+ public void saveLockPattern(List<LockPatternView.Cell> pattern) {
+ // Compute the hash
+ final byte[] hash = LockPatternUtils.patternToHash(pattern);
+ try {
+ // Write the hash to file
+ RandomAccessFile raf = new RandomAccessFile(sLockPatternFilename, "rw");
+ // Truncate the file if pattern is null, to clear the lock
+ if (pattern == null) {
+ raf.setLength(0);
+ } else {
+ raf.write(hash, 0, hash.length);
+ }
+ raf.close();
+ } catch (FileNotFoundException fnfe) {
+ // Cant do much, unless we want to fail over to using the settings provider
+ Log.e(TAG, "Unable to save lock pattern to " + sLockPatternFilename);
+ } catch (IOException ioe) {
+ // Cant do much
+ Log.e(TAG, "Unable to save lock pattern to " + sLockPatternFilename);
+ }
+ }
+
+ /**
+ * Deserialize a pattern.
+ * @param string The pattern serialized with {@link #patternToString}
+ * @return The pattern.
+ */
+ public static List<LockPatternView.Cell> stringToPattern(String string) {
+ List<LockPatternView.Cell> result = Lists.newArrayList();
+
+ final byte[] bytes = string.getBytes();
+ for (int i = 0; i < bytes.length; i++) {
+ byte b = bytes[i];
+ result.add(LockPatternView.Cell.of(b / 3, b % 3));
+ }
+ return result;
+ }
+
+ /**
+ * Serialize a pattern.
+ * @param pattern The pattern.
+ * @return The pattern in string form.
+ */
+ public static String patternToString(List<LockPatternView.Cell> pattern) {
+ if (pattern == null) {
+ return "";
+ }
+ final int patternSize = pattern.size();
+
+ byte[] res = new byte[patternSize];
+ for (int i = 0; i < patternSize; i++) {
+ LockPatternView.Cell cell = pattern.get(i);
+ res[i] = (byte) (cell.getRow() * 3 + cell.getColumn());
+ }
+ return new String(res);
+ }
+
+ /*
+ * Generate an SHA-1 hash for the pattern. Not the most secure, but it is
+ * at least a second level of protection. First level is that the file
+ * is in a location only readable by the system process.
+ * @param pattern the gesture pattern.
+ * @return the hash of the pattern in a byte array.
+ */
+ static byte[] patternToHash(List<LockPatternView.Cell> pattern) {
+ if (pattern == null) {
+ return null;
+ }
+
+ final int patternSize = pattern.size();
+ byte[] res = new byte[patternSize];
+ for (int i = 0; i < patternSize; i++) {
+ LockPatternView.Cell cell = pattern.get(i);
+ res[i] = (byte) (cell.getRow() * 3 + cell.getColumn());
+ }
+ try {
+ MessageDigest md = MessageDigest.getInstance("SHA-1");
+ byte[] hash = md.digest(res);
+ return hash;
+ } catch (NoSuchAlgorithmException nsa) {
+ return res;
+ }
+ }
+
+ /**
+ * @return Whether the lock pattern is enabled.
+ */
+ public boolean isLockPatternEnabled() {
+ return getBoolean(Settings.System.LOCK_PATTERN_ENABLED);
+ }
+
+ /**
+ * Set whether the lock pattern is enabled.
+ */
+ public void setLockPatternEnabled(boolean enabled) {
+ setBoolean(Settings.System.LOCK_PATTERN_ENABLED, enabled);
+ }
+
+ /**
+ * @return Whether the visible pattern is enabled.
+ */
+ public boolean isVisiblePatternEnabled() {
+ return getBoolean(Settings.System.LOCK_PATTERN_VISIBLE);
+ }
+
+ /**
+ * Set whether the visible pattern is enabled.
+ */
+ public void setVisiblePatternEnabled(boolean enabled) {
+ setBoolean(Settings.System.LOCK_PATTERN_VISIBLE, enabled);
+ }
+
+ /**
+ * @return Whether tactile feedback for the pattern is enabled.
+ */
+ public boolean isTactileFeedbackEnabled() {
+ return getBoolean(Settings.System.LOCK_PATTERN_TACTILE_FEEDBACK_ENABLED);
+ }
+
+ /**
+ * Set whether tactile feedback for the pattern is enabled.
+ */
+ public void setTactileFeedbackEnabled(boolean enabled) {
+ setBoolean(Settings.System.LOCK_PATTERN_TACTILE_FEEDBACK_ENABLED, enabled);
+ }
+
+ /**
+ * Set and store the lockout deadline, meaning the user can't attempt his/her unlock
+ * pattern until the deadline has passed.
+ * @return the chosen deadline.
+ */
+ public long setLockoutAttemptDeadline() {
+ final long deadline = SystemClock.elapsedRealtime() + FAILED_ATTEMPT_TIMEOUT_MS;
+ setLong(LOCKOUT_ATTEMPT_DEADLINE, deadline);
+ return deadline;
+ }
+
+ /**
+ * @return The elapsed time in millis in the future when the user is allowed to
+ * attempt to enter his/her lock pattern, or 0 if the user is welcome to
+ * enter a pattern.
+ */
+ public long getLockoutAttemptDeadline() {
+ final long deadline = getLong(LOCKOUT_ATTEMPT_DEADLINE, 0L);
+ final long now = SystemClock.elapsedRealtime();
+ if (deadline < now || deadline > (now + FAILED_ATTEMPT_TIMEOUT_MS)) {
+ return 0L;
+ }
+ return deadline;
+ }
+
+ /**
+ * @return Whether the user is permanently locked out until they verify their
+ * credentials. Occurs after {@link #FAILED_ATTEMPTS_BEFORE_RESET} failed
+ * attempts.
+ */
+ public boolean isPermanentlyLocked() {
+ return getBoolean(LOCKOUT_PERMANENT_KEY);
+ }
+
+ /**
+ * Set the state of whether the device is permanently locked, meaning the user
+ * must authenticate via other means. If false, that means the user has gone
+ * out of permanent lock, so the existing (forgotten) lock pattern needs to
+ * be cleared.
+ * @param locked Whether the user is permanently locked out until they verify their
+ * credentials. Occurs after {@link #FAILED_ATTEMPTS_BEFORE_RESET} failed
+ * attempts.
+ */
+ public void setPermanentlyLocked(boolean locked) {
+ setBoolean(LOCKOUT_PERMANENT_KEY, locked);
+
+ if (!locked) {
+ setLockPatternEnabled(false);
+ saveLockPattern(null);
+ }
+ }
+
+ /**
+ * @return A formatted string of the next alarm (for showing on the lock screen),
+ * or null if there is no next alarm.
+ */
+ public String getNextAlarm() {
+ String nextAlarm = Settings.System.getString(mContentResolver,
+ Settings.System.NEXT_ALARM_FORMATTED);
+ if (nextAlarm == null || TextUtils.isEmpty(nextAlarm)) {
+ return null;
+ }
+ return nextAlarm;
+ }
+
+ private boolean getBoolean(String systemSettingKey) {
+ return 1 ==
+ android.provider.Settings.System.getInt(
+ mContentResolver,
+ systemSettingKey, 0);
+ }
+
+ private void setBoolean(String systemSettingKey, boolean enabled) {
+ android.provider.Settings.System.putInt(
+ mContentResolver,
+ systemSettingKey,
+ enabled ? 1 : 0);
+ }
+
+ private long getLong(String systemSettingKey, long def) {
+ return android.provider.Settings.System.getLong(mContentResolver, systemSettingKey, def);
+ }
+
+ private void setLong(String systemSettingKey, long value) {
+ android.provider.Settings.System.putLong(mContentResolver, systemSettingKey, value);
+ }
+
+
+}