1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.settings;
18
19import android.app.Fragment;
20import android.content.Context;
21import android.content.Intent;
22import android.os.AsyncTask;
23import android.os.Bundle;
24import android.os.UserManager;
25
26import com.android.internal.widget.LockPatternUtils;
27
28/**
29 * An invisible retained worker fragment to track the AsyncWork that saves (and optionally
30 * verifies if a challenge is given) the chosen lock credential (pattern/pin/password).
31 */
32abstract class SaveChosenLockWorkerBase extends Fragment {
33
34    private Listener mListener;
35    private boolean mFinished;
36    private Intent mResultData;
37
38    protected LockPatternUtils mUtils;
39    protected boolean mHasChallenge;
40    protected long mChallenge;
41    protected boolean mWasSecureBefore;
42    protected int mUserId;
43
44    private boolean mBlocking;
45
46    @Override
47    public void onCreate(Bundle savedInstanceState) {
48        super.onCreate(savedInstanceState);
49        setRetainInstance(true);
50    }
51
52    public void setListener(Listener listener) {
53        if (mListener == listener) {
54            return;
55        }
56
57        mListener = listener;
58        if (mFinished && mListener != null) {
59            mListener.onChosenLockSaveFinished(mWasSecureBefore, mResultData);
60        }
61    }
62
63    protected void prepare(LockPatternUtils utils, boolean credentialRequired,
64            boolean hasChallenge, long challenge, int userId) {
65        mUtils = utils;
66        mUserId = userId;
67
68        mHasChallenge = hasChallenge;
69        mChallenge = challenge;
70        // This will be a no-op for non managed profiles.
71        mWasSecureBefore = mUtils.isSecure(mUserId);
72
73        Context context = getContext();
74        // If context is null, we're being invoked to change the setCredentialRequiredToDecrypt,
75        // and we made sure that this is the primary user already.
76        if (context == null || UserManager.get(context).getUserInfo(mUserId).isPrimary()) {
77            mUtils.setCredentialRequiredToDecrypt(credentialRequired);
78        }
79
80        mFinished = false;
81        mResultData = null;
82    }
83
84    protected void start() {
85        if (mBlocking) {
86            finish(saveAndVerifyInBackground());
87        } else {
88            new Task().execute();
89        }
90    }
91
92    /**
93     * Executes the save and verify work in background.
94     * @return Intent with challenge token or null.
95     */
96    protected abstract Intent saveAndVerifyInBackground();
97
98    protected void finish(Intent resultData) {
99        mFinished = true;
100        mResultData = resultData;
101        if (mListener != null) {
102            mListener.onChosenLockSaveFinished(mWasSecureBefore, mResultData);
103        }
104    }
105
106    public void setBlocking(boolean blocking) {
107        mBlocking = blocking;
108    }
109
110    private class Task extends AsyncTask<Void, Void, Intent> {
111        @Override
112        protected Intent doInBackground(Void... params){
113            return saveAndVerifyInBackground();
114        }
115
116        @Override
117        protected void onPostExecute(Intent resultData) {
118            finish(resultData);
119        }
120    }
121
122    interface Listener {
123        public void onChosenLockSaveFinished(boolean wasSecureBefore, Intent resultData);
124    }
125}
126