src/com/android/car/settings/security/ConfirmLockPatternFragment.java

/*
 * 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.car.settings.security;

import android.content.Context;
import android.os.Bundle;
import android.os.UserHandle;
import android.view.View;
import android.widget.TextView;

import androidx.annotation.LayoutRes;
import androidx.annotation.StringRes;

import com.android.car.settings.R;
import com.android.car.settings.common.BaseFragment;
import com.android.internal.widget.LockPatternView;
import com.android.internal.widget.LockscreenCredential;

import java.util.List;

/**
 * Fragment for confirming existing lock pattern
 */
public class ConfirmLockPatternFragment extends BaseFragment {

    private static final String FRAGMENT_TAG_CHECK_LOCK_WORKER = "check_lock_worker";
    // Time we wait before clearing a wrong pattern and the error message.
    private static final long CLEAR_WRONG_ATTEMPT_TIMEOUT_MS = 2500L;

    private LockPatternView mLockPatternView;
    private TextView mMsgView;

    private CheckLockWorker mCheckLockWorker;
    private CheckLockListener mCheckLockListener;

    private int mUserId;
    private List<LockPatternView.Cell> mPattern;

    private ConfirmLockLockoutHelper mConfirmLockLockoutHelper;

    @Override
    @LayoutRes
    protected int getLayoutId() {
        return R.layout.confirm_lock_pattern;
    }

    @Override
    @StringRes
    protected int getTitleId() {
        return R.string.security_settings_title;
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if ((getActivity() instanceof CheckLockListener)) {
            mCheckLockListener = (CheckLockListener) getActivity();
        } else {
            throw new RuntimeException("The activity must implement CheckLockListener");
        }

        mUserId = UserHandle.myUserId();
        mConfirmLockLockoutHelper = ConfirmLockLockoutHelper.getInstance(requireContext(), mUserId);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        mMsgView = (TextView) view.findViewById(R.id.message);
        mLockPatternView = (LockPatternView) view.findViewById(R.id.lockPattern);
        mLockPatternView.setFadePattern(false);
        mLockPatternView.setInStealthMode(
                !mConfirmLockLockoutHelper.getLockPatternUtils().isVisiblePatternEnabled(mUserId));
        mLockPatternView.setOnPatternListener(mLockPatternListener);
        mConfirmLockLockoutHelper.setConfirmLockUIController(
                new ConfirmLockLockoutHelper.ConfirmLockUIController() {
                    @Override
                    public void setErrorText(String text) {
                        mMsgView.setText(text);
                    }

                    @Override
                    public void refreshUI(boolean isLockedOut) {
                        mLockPatternView.setEnabled(!isLockedOut);
                        mLockPatternView.clearPattern();
                    }
                });

        if (savedInstanceState != null) {
            mCheckLockWorker = (CheckLockWorker) getFragmentManager().findFragmentByTag(
                    FRAGMENT_TAG_CHECK_LOCK_WORKER);
        }
    }

    @Override
    public void onStart() {
        super.onStart();
        if (mCheckLockWorker != null) {
            mCheckLockWorker.setListener(this::onCheckCompleted);
        }
    }

    @Override
    public void onResume() {
        super.onResume();

        mConfirmLockLockoutHelper.onResumeUI();
    }

    @Override
    public void onPause() {
        super.onPause();

        mConfirmLockLockoutHelper.onPauseUI();
    }

    @Override
    public void onStop() {
        super.onStop();
        if (mCheckLockWorker != null) {
            mCheckLockWorker.setListener(null);
        }
    }

    private Runnable mClearErrorRunnable = () -> {
        mLockPatternView.setEnabled(true);
        mLockPatternView.clearPattern();
        mMsgView.setText("");
    };

    private LockPatternView.OnPatternListener mLockPatternListener =
            new LockPatternView.OnPatternListener() {

                public void onPatternStart() {
                    mLockPatternView.removeCallbacks(mClearErrorRunnable);
                    mMsgView.setText("");
                }

                public void onPatternCleared() {
                    mLockPatternView.removeCallbacks(mClearErrorRunnable);
                }

                public void onPatternCellAdded(List<LockPatternView.Cell> pattern) {
                }

                public void onPatternDetected(List<LockPatternView.Cell> pattern) {
                    mLockPatternView.setEnabled(false);

                    if (mCheckLockWorker == null) {
                        mCheckLockWorker = new CheckLockWorker();
                        mCheckLockWorker.setListener(
                                ConfirmLockPatternFragment.this::onCheckCompleted);

                        getFragmentManager()
                                .beginTransaction()
                                .add(mCheckLockWorker, FRAGMENT_TAG_CHECK_LOCK_WORKER)
                                .commitNow();
                    }

                    mPattern = pattern;
                    mCheckLockWorker.checkPattern(mUserId, pattern);
                }
            };

    private void onCheckCompleted(boolean lockMatched, int timeoutMs) {
        if (lockMatched) {
            try (LockscreenCredential patternCred = LockscreenCredential.createPattern(mPattern)) {
                // onLockVerified does not take ownership of the LockscreenCredential
                // see CheckLockActivity#onLockVerified and VerifyLockChangeActivity#onLockVerified
                mCheckLockListener.onLockVerified(patternCred);
            }
        } else {
            if (timeoutMs > 0) {
                mConfirmLockLockoutHelper.onCheckCompletedWithTimeout(timeoutMs);
            } else {
                mLockPatternView.setEnabled(true);
                mMsgView.setText(R.string.lockpattern_pattern_wrong);

                // Set timer to clear wrong pattern
                mLockPatternView.removeCallbacks(mClearErrorRunnable);
                mLockPatternView.postDelayed(mClearErrorRunnable, CLEAR_WRONG_ATTEMPT_TIMEOUT_MS);
            }
        }
    }
}