KeyguardAccountView.java revision 6dbf8610e94c1b41e0124577101d6369fd204ad3 
1/*
2 * Copyright (C) 2012 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 */
16package com.android.internal.policy.impl.keyguard;
17
18import android.accounts.Account;
19import android.accounts.AccountManager;
20import android.accounts.AccountManagerCallback;
21import android.accounts.AccountManagerFuture;
22import android.accounts.AuthenticatorException;
23import android.accounts.OperationCanceledException;
24import android.app.Dialog;
25import android.app.ProgressDialog;
26import android.content.Context;
27import android.content.Intent;
28import android.graphics.Rect;
29import android.os.Bundle;
30import android.text.Editable;
31import android.text.InputFilter;
32import android.text.LoginFilter;
33import android.text.TextWatcher;
34import android.util.AttributeSet;
35import android.view.KeyEvent;
36import android.view.View;
37import android.view.WindowManager;
38import android.widget.Button;
39import android.widget.EditText;
40import android.widget.LinearLayout;
41
42import com.android.internal.widget.LockPatternUtils;
43import com.android.internal.R;
44
45import java.io.IOException;
46
47/**
48 * When the user forgets their password a bunch of times, we fall back on their
49 * account's login/password to unlock the phone (and reset their lock pattern).
50 */
51public class KeyguardAccountView extends LinearLayout implements KeyguardSecurityView,
52        View.OnClickListener, TextWatcher {
53    private static final int AWAKE_POKE_MILLIS = 30000;
54    private static final String LOCK_PATTERN_PACKAGE = "com.android.settings";
55    private static final String LOCK_PATTERN_CLASS = LOCK_PATTERN_PACKAGE + ".ChooseLockGeneric";
56
57    private KeyguardSecurityCallback mCallback;
58    private LockPatternUtils mLockPatternUtils;
59    private EditText mLogin;
60    private EditText mPassword;
61    private Button mOk;
62    public boolean mEnableFallback;
63    private SecurityMessageDisplay mSecurityMessageDisplay;
64
65    /**
66     * Shown while making asynchronous check of password.
67     */
68    private ProgressDialog mCheckingDialog;
69
70    public KeyguardAccountView(Context context) {
71        this(context, null, 0);
72    }
73
74    public KeyguardAccountView(Context context, AttributeSet attrs) {
75        this(context, attrs, 0);
76    }
77
78    public KeyguardAccountView(Context context, AttributeSet attrs, int defStyle) {
79        super(context, attrs, defStyle);
80        mLockPatternUtils = new LockPatternUtils(getContext());
81    }
82
83    @Override
84    protected void onFinishInflate() {
85        super.onFinishInflate();
86
87        // We always set a dummy NavigationManager to avoid null checks
88        mSecurityMessageDisplay = new KeyguardNavigationManager(null);
89
90        mLogin = (EditText) findViewById(R.id.login);
91        mLogin.setFilters(new InputFilter[] { new LoginFilter.UsernameFilterGeneric() } );
92        mLogin.addTextChangedListener(this);
93
94        mPassword = (EditText) findViewById(R.id.password);
95        mPassword.addTextChangedListener(this);
96
97        mOk = (Button) findViewById(R.id.ok);
98        mOk.setOnClickListener(this);
99        reset();
100    }
101
102    public void setKeyguardCallback(KeyguardSecurityCallback callback) {
103        mCallback = callback;
104    }
105
106    public void setLockPatternUtils(LockPatternUtils utils) {
107        mLockPatternUtils = utils;
108    }
109
110    public KeyguardSecurityCallback getCallback() {
111        return mCallback;
112    }
113
114
115    public void afterTextChanged(Editable s) {
116    }
117
118    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
119    }
120
121    public void onTextChanged(CharSequence s, int start, int before, int count) {
122        if (mCallback != null) {
123            mCallback.userActivity(AWAKE_POKE_MILLIS);
124        }
125    }
126
127    @Override
128    protected boolean onRequestFocusInDescendants(int direction,
129            Rect previouslyFocusedRect) {
130        // send focus to the login field
131        return mLogin.requestFocus(direction, previouslyFocusedRect);
132    }
133
134    public boolean needsInput() {
135        return true;
136    }
137
138    public void reset() {
139        // start fresh
140        mLogin.setText("");
141        mPassword.setText("");
142        mLogin.requestFocus();
143        boolean permLocked = mLockPatternUtils.isPermanentlyLocked();
144        mSecurityMessageDisplay.setMessage(permLocked ? R.string.kg_login_too_many_attempts :
145            R.string.kg_login_instructions, permLocked ? true : false);
146    }
147
148    /** {@inheritDoc} */
149    public void cleanUp() {
150        if (mCheckingDialog != null) {
151            mCheckingDialog.hide();
152        }
153        mCallback = null;
154        mLockPatternUtils = null;
155    }
156
157    public void onClick(View v) {
158        mCallback.userActivity(0);
159        if (v == mOk) {
160            asyncCheckPassword();
161        }
162    }
163
164    private void postOnCheckPasswordResult(final boolean success) {
165        // ensure this runs on UI thread
166        mLogin.post(new Runnable() {
167            public void run() {
168                if (success) {
169                    // clear out forgotten password
170                    mLockPatternUtils.setPermanentlyLocked(false);
171                    mLockPatternUtils.setLockPatternEnabled(false);
172                    mLockPatternUtils.saveLockPattern(null);
173
174                    // launch the 'choose lock pattern' activity so
175                    // the user can pick a new one if they want to
176                    Intent intent = new Intent();
177                    intent.setClassName(LOCK_PATTERN_PACKAGE, LOCK_PATTERN_CLASS);
178                    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
179                    mContext.startActivity(intent);
180                    mCallback.reportSuccessfulUnlockAttempt();
181
182                    // dismiss keyguard
183                    mCallback.dismiss(true);
184                } else {
185                    mSecurityMessageDisplay.setMessage(R.string.kg_login_invalid_input, true);
186                    mPassword.setText("");
187                    mCallback.reportFailedUnlockAttempt();
188                }
189            }
190        });
191    }
192
193    @Override
194    public boolean dispatchKeyEvent(KeyEvent event) {
195        if (event.getAction() == KeyEvent.ACTION_DOWN
196                && event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
197            if (mLockPatternUtils.isPermanentlyLocked()) {
198                mCallback.dismiss(false);
199            } else {
200                // TODO: mCallback.forgotPattern(false);
201            }
202            return true;
203        }
204        return super.dispatchKeyEvent(event);
205    }
206
207    /**
208     * Given the string the user entered in the 'username' field, find
209     * the stored account that they probably intended.  Prefer, in order:
210     *
211     *   - an exact match for what was typed, or
212     *   - a case-insensitive match for what was typed, or
213     *   - if they didn't include a domain, an exact match of the username, or
214     *   - if they didn't include a domain, a case-insensitive
215     *     match of the username.
216     *
217     * If there is a tie for the best match, choose neither --
218     * the user needs to be more specific.
219     *
220     * @return an account name from the database, or null if we can't
221     * find a single best match.
222     */
223    private Account findIntendedAccount(String username) {
224        Account[] accounts = AccountManager.get(mContext).getAccountsByType("com.google");
225
226        // Try to figure out which account they meant if they
227        // typed only the username (and not the domain), or got
228        // the case wrong.
229
230        Account bestAccount = null;
231        int bestScore = 0;
232        for (Account a: accounts) {
233            int score = 0;
234            if (username.equals(a.name)) {
235                score = 4;
236            } else if (username.equalsIgnoreCase(a.name)) {
237                score = 3;
238            } else if (username.indexOf('@') < 0) {
239                int i = a.name.indexOf('@');
240                if (i >= 0) {
241                    String aUsername = a.name.substring(0, i);
242                    if (username.equals(aUsername)) {
243                        score = 2;
244                    } else if (username.equalsIgnoreCase(aUsername)) {
245                        score = 1;
246                    }
247                }
248            }
249            if (score > bestScore) {
250                bestAccount = a;
251                bestScore = score;
252            } else if (score == bestScore) {
253                bestAccount = null;
254            }
255        }
256        return bestAccount;
257    }
258
259    private void asyncCheckPassword() {
260        mCallback.userActivity(AWAKE_POKE_MILLIS);
261        final String login = mLogin.getText().toString();
262        final String password = mPassword.getText().toString();
263        Account account = findIntendedAccount(login);
264        if (account == null) {
265            postOnCheckPasswordResult(false);
266            return;
267        }
268        getProgressDialog().show();
269        Bundle options = new Bundle();
270        options.putString(AccountManager.KEY_PASSWORD, password);
271        AccountManager.get(mContext).confirmCredentials(account, options, null /* activity */,
272                new AccountManagerCallback<Bundle>() {
273            public void run(AccountManagerFuture<Bundle> future) {
274                try {
275                    mCallback.userActivity(AWAKE_POKE_MILLIS);
276                    final Bundle result = future.getResult();
277                    final boolean verified = result.getBoolean(AccountManager.KEY_BOOLEAN_RESULT);
278                    postOnCheckPasswordResult(verified);
279                } catch (OperationCanceledException e) {
280                    postOnCheckPasswordResult(false);
281                } catch (IOException e) {
282                    postOnCheckPasswordResult(false);
283                } catch (AuthenticatorException e) {
284                    postOnCheckPasswordResult(false);
285                } finally {
286                    mLogin.post(new Runnable() {
287                        public void run() {
288                            getProgressDialog().hide();
289                        }
290                    });
291                }
292            }
293        }, null /* handler */);
294    }
295
296    private Dialog getProgressDialog() {
297        if (mCheckingDialog == null) {
298            mCheckingDialog = new ProgressDialog(mContext);
299            mCheckingDialog.setMessage(
300                    mContext.getString(R.string.kg_login_checking_password));
301            mCheckingDialog.setIndeterminate(true);
302            mCheckingDialog.setCancelable(false);
303            mCheckingDialog.getWindow().setType(
304                    WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
305        }
306        return mCheckingDialog;
307    }
308
309    @Override
310    public void onPause() {
311
312    }
313
314    @Override
315    public void onResume() {
316        reset();
317    }
318
319    @Override
320    public void setSecurityMessageDisplay(SecurityMessageDisplay display) {
321        mSecurityMessageDisplay = display;
322        reset();
323    }
324}
325
326