1/*
2 * Copyright (C) 2014 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.server.pm;
18
19import android.app.AppGlobals;
20import android.content.ComponentName;
21import android.content.Context;
22import android.content.Intent;
23import android.content.pm.ActivityInfo;
24import android.content.pm.ILauncherApps;
25import android.content.pm.IOnAppsChangedListener;
26import android.content.pm.IPackageManager;
27import android.content.pm.PackageManager;
28import android.content.pm.PackageInfo;
29import android.content.pm.ResolveInfo;
30import android.content.pm.UserInfo;
31import android.graphics.Rect;
32import android.net.Uri;
33import android.os.Binder;
34import android.os.Bundle;
35import android.os.IInterface;
36import android.os.RemoteCallbackList;
37import android.os.RemoteException;
38import android.os.UserHandle;
39import android.os.UserManager;
40import android.provider.Settings;
41import android.util.Log;
42import android.util.Slog;
43
44import com.android.internal.content.PackageMonitor;
45import com.android.server.SystemService;
46
47import java.util.ArrayList;
48import java.util.List;
49
50/**
51 * Service that manages requests and callbacks for launchers that support
52 * managed profiles.
53 */
54
55public class LauncherAppsService extends SystemService {
56
57    private final LauncherAppsImpl mLauncherAppsImpl;
58
59    public LauncherAppsService(Context context) {
60        super(context);
61        mLauncherAppsImpl = new LauncherAppsImpl(context);
62    }
63
64    @Override
65    public void onStart() {
66        publishBinderService(Context.LAUNCHER_APPS_SERVICE, mLauncherAppsImpl);
67    }
68
69    class LauncherAppsImpl extends ILauncherApps.Stub {
70        private static final boolean DEBUG = false;
71        private static final String TAG = "LauncherAppsService";
72        private final Context mContext;
73        private final PackageManager mPm;
74        private final UserManager mUm;
75        private final PackageCallbackList<IOnAppsChangedListener> mListeners
76                = new PackageCallbackList<IOnAppsChangedListener>();
77
78        private MyPackageMonitor mPackageMonitor = new MyPackageMonitor();
79
80        public LauncherAppsImpl(Context context) {
81            mContext = context;
82            mPm = mContext.getPackageManager();
83            mUm = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
84        }
85
86        /*
87         * @see android.content.pm.ILauncherApps#addOnAppsChangedListener(
88         *          android.content.pm.IOnAppsChangedListener)
89         */
90        @Override
91        public void addOnAppsChangedListener(IOnAppsChangedListener listener) throws RemoteException {
92            synchronized (mListeners) {
93                if (DEBUG) {
94                    Log.d(TAG, "Adding listener from " + Binder.getCallingUserHandle());
95                }
96                if (mListeners.getRegisteredCallbackCount() == 0) {
97                    if (DEBUG) {
98                        Log.d(TAG, "Starting package monitoring");
99                    }
100                    startWatchingPackageBroadcasts();
101                }
102                mListeners.unregister(listener);
103                mListeners.register(listener, Binder.getCallingUserHandle());
104            }
105        }
106
107        /*
108         * @see android.content.pm.ILauncherApps#removeOnAppsChangedListener(
109         *          android.content.pm.IOnAppsChangedListener)
110         */
111        @Override
112        public void removeOnAppsChangedListener(IOnAppsChangedListener listener)
113                throws RemoteException {
114            synchronized (mListeners) {
115                if (DEBUG) {
116                    Log.d(TAG, "Removing listener from " + Binder.getCallingUserHandle());
117                }
118                mListeners.unregister(listener);
119                if (mListeners.getRegisteredCallbackCount() == 0) {
120                    stopWatchingPackageBroadcasts();
121                }
122            }
123        }
124
125        /**
126         * Register a receiver to watch for package broadcasts
127         */
128        private void startWatchingPackageBroadcasts() {
129            mPackageMonitor.register(mContext, null, UserHandle.ALL, true);
130        }
131
132        /**
133         * Unregister package broadcast receiver
134         */
135        private void stopWatchingPackageBroadcasts() {
136            if (DEBUG) {
137                Log.d(TAG, "Stopped watching for packages");
138            }
139            mPackageMonitor.unregister();
140        }
141
142        void checkCallbackCount() {
143            synchronized (mListeners) {
144                if (DEBUG) {
145                    Log.d(TAG, "Callback count = " + mListeners.getRegisteredCallbackCount());
146                }
147                if (mListeners.getRegisteredCallbackCount() == 0) {
148                    stopWatchingPackageBroadcasts();
149                }
150            }
151        }
152
153        /**
154         * Checks if the caller is in the same group as the userToCheck.
155         */
156        private void ensureInUserProfiles(UserHandle userToCheck, String message) {
157            final int callingUserId = UserHandle.getCallingUserId();
158            final int targetUserId = userToCheck.getIdentifier();
159
160            if (targetUserId == callingUserId) return;
161
162            long ident = Binder.clearCallingIdentity();
163            try {
164                UserInfo callingUserInfo = mUm.getUserInfo(callingUserId);
165                UserInfo targetUserInfo = mUm.getUserInfo(targetUserId);
166                if (targetUserInfo == null
167                        || targetUserInfo.profileGroupId == UserInfo.NO_PROFILE_GROUP_ID
168                        || targetUserInfo.profileGroupId != callingUserInfo.profileGroupId) {
169                    throw new SecurityException(message);
170                }
171            } finally {
172                Binder.restoreCallingIdentity(ident);
173            }
174        }
175
176        /**
177         * Checks if the user is enabled.
178         */
179        private boolean isUserEnabled(UserHandle user) {
180            long ident = Binder.clearCallingIdentity();
181            try {
182                UserInfo targetUserInfo = mUm.getUserInfo(user.getIdentifier());
183                return targetUserInfo != null && targetUserInfo.isEnabled();
184            } finally {
185                Binder.restoreCallingIdentity(ident);
186            }
187        }
188
189        @Override
190        public List<ResolveInfo> getLauncherActivities(String packageName, UserHandle user)
191                throws RemoteException {
192            ensureInUserProfiles(user, "Cannot retrieve activities for unrelated profile " + user);
193            if (!isUserEnabled(user)) {
194                return new ArrayList<ResolveInfo>();
195            }
196
197            final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
198            mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
199            mainIntent.setPackage(packageName);
200            long ident = Binder.clearCallingIdentity();
201            try {
202                List<ResolveInfo> apps = mPm.queryIntentActivitiesAsUser(mainIntent, 0 /* flags */,
203                        user.getIdentifier());
204                return apps;
205            } finally {
206                Binder.restoreCallingIdentity(ident);
207            }
208        }
209
210        @Override
211        public ResolveInfo resolveActivity(Intent intent, UserHandle user)
212                throws RemoteException {
213            ensureInUserProfiles(user, "Cannot resolve activity for unrelated profile " + user);
214            if (!isUserEnabled(user)) {
215                return null;
216            }
217
218            long ident = Binder.clearCallingIdentity();
219            try {
220                ResolveInfo app = mPm.resolveActivityAsUser(intent, 0, user.getIdentifier());
221                return app;
222            } finally {
223                Binder.restoreCallingIdentity(ident);
224            }
225        }
226
227        @Override
228        public boolean isPackageEnabled(String packageName, UserHandle user)
229                throws RemoteException {
230            ensureInUserProfiles(user, "Cannot check package for unrelated profile " + user);
231            if (!isUserEnabled(user)) {
232                return false;
233            }
234
235            long ident = Binder.clearCallingIdentity();
236            try {
237                IPackageManager pm = AppGlobals.getPackageManager();
238                PackageInfo info = pm.getPackageInfo(packageName, 0, user.getIdentifier());
239                return info != null && info.applicationInfo.enabled;
240            } finally {
241                Binder.restoreCallingIdentity(ident);
242            }
243        }
244
245        @Override
246        public boolean isActivityEnabled(ComponentName component, UserHandle user)
247                throws RemoteException {
248            ensureInUserProfiles(user, "Cannot check component for unrelated profile " + user);
249            if (!isUserEnabled(user)) {
250                return false;
251            }
252
253            long ident = Binder.clearCallingIdentity();
254            try {
255                IPackageManager pm = AppGlobals.getPackageManager();
256                ActivityInfo info = pm.getActivityInfo(component, 0, user.getIdentifier());
257                return info != null;
258            } finally {
259                Binder.restoreCallingIdentity(ident);
260            }
261        }
262
263        @Override
264        public void startActivityAsUser(ComponentName component, Rect sourceBounds,
265                Bundle opts, UserHandle user) throws RemoteException {
266            ensureInUserProfiles(user, "Cannot start activity for unrelated profile " + user);
267            if (!isUserEnabled(user)) {
268                throw new IllegalStateException("Cannot start activity for disabled profile "  + user);
269            }
270
271            Intent launchIntent = new Intent(Intent.ACTION_MAIN);
272            launchIntent.addCategory(Intent.CATEGORY_LAUNCHER);
273            launchIntent.setSourceBounds(sourceBounds);
274            launchIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
275            launchIntent.setPackage(component.getPackageName());
276
277            long ident = Binder.clearCallingIdentity();
278            try {
279                IPackageManager pm = AppGlobals.getPackageManager();
280                ActivityInfo info = pm.getActivityInfo(component, 0, user.getIdentifier());
281                if (!info.exported) {
282                    throw new SecurityException("Cannot launch non-exported components "
283                            + component);
284                }
285
286                // Check that the component actually has Intent.CATEGORY_LAUCNCHER
287                // as calling startActivityAsUser ignores the category and just
288                // resolves based on the component if present.
289                List<ResolveInfo> apps = mPm.queryIntentActivitiesAsUser(launchIntent,
290                        0 /* flags */, user.getIdentifier());
291                final int size = apps.size();
292                for (int i = 0; i < size; ++i) {
293                    ActivityInfo activityInfo = apps.get(i).activityInfo;
294                    if (activityInfo.packageName.equals(component.getPackageName()) &&
295                            activityInfo.name.equals(component.getClassName())) {
296                        // Found an activity with category launcher that matches
297                        // this component so ok to launch.
298                        launchIntent.setComponent(component);
299                        mContext.startActivityAsUser(launchIntent, opts, user);
300                        return;
301                    }
302                }
303                throw new SecurityException("Attempt to launch activity without "
304                        + " category Intent.CATEGORY_LAUNCHER " + component);
305            } finally {
306                Binder.restoreCallingIdentity(ident);
307            }
308        }
309
310        @Override
311        public void showAppDetailsAsUser(ComponentName component, Rect sourceBounds,
312                Bundle opts, UserHandle user) throws RemoteException {
313            ensureInUserProfiles(user, "Cannot show app details for unrelated profile " + user);
314            if (!isUserEnabled(user)) {
315                throw new IllegalStateException("Cannot show app details for disabled profile "
316                        + user);
317            }
318
319            long ident = Binder.clearCallingIdentity();
320            try {
321                String packageName = component.getPackageName();
322                Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
323                        Uri.fromParts("package", packageName, null));
324                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK |
325                        Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
326                intent.setSourceBounds(sourceBounds);
327                mContext.startActivityAsUser(intent, opts, user);
328            } finally {
329                Binder.restoreCallingIdentity(ident);
330            }
331        }
332
333
334        private class MyPackageMonitor extends PackageMonitor {
335
336            /** Checks if user is a profile of or same as listeningUser.
337              * and the user is enabled. */
338            private boolean isEnabledProfileOf(UserHandle user, UserHandle listeningUser,
339                    String debugMsg) {
340                if (user.getIdentifier() == listeningUser.getIdentifier()) {
341                    if (DEBUG) Log.d(TAG, "Delivering msg to same user " + debugMsg);
342                    return true;
343                }
344                long ident = Binder.clearCallingIdentity();
345                try {
346                    UserInfo userInfo = mUm.getUserInfo(user.getIdentifier());
347                    UserInfo listeningUserInfo = mUm.getUserInfo(listeningUser.getIdentifier());
348                    if (userInfo == null || listeningUserInfo == null
349                            || userInfo.profileGroupId == UserInfo.NO_PROFILE_GROUP_ID
350                            || userInfo.profileGroupId != listeningUserInfo.profileGroupId
351                            || !userInfo.isEnabled()) {
352                        if (DEBUG) {
353                            Log.d(TAG, "Not delivering msg from " + user + " to " + listeningUser + ":"
354                                    + debugMsg);
355                        }
356                        return false;
357                    } else {
358                        if (DEBUG) {
359                            Log.d(TAG, "Delivering msg from " + user + " to " + listeningUser + ":"
360                                    + debugMsg);
361                        }
362                        return true;
363                    }
364                } finally {
365                    Binder.restoreCallingIdentity(ident);
366                }
367            }
368
369            @Override
370            public void onPackageAdded(String packageName, int uid) {
371                UserHandle user = new UserHandle(getChangingUserId());
372                final int n = mListeners.beginBroadcast();
373                for (int i = 0; i < n; i++) {
374                    IOnAppsChangedListener listener = mListeners.getBroadcastItem(i);
375                    UserHandle listeningUser = (UserHandle) mListeners.getBroadcastCookie(i);
376                    if (!isEnabledProfileOf(user, listeningUser, "onPackageAdded")) continue;
377                    try {
378                        listener.onPackageAdded(user, packageName);
379                    } catch (RemoteException re) {
380                        Slog.d(TAG, "Callback failed ", re);
381                    }
382                }
383                mListeners.finishBroadcast();
384
385                super.onPackageAdded(packageName, uid);
386            }
387
388            @Override
389            public void onPackageRemoved(String packageName, int uid) {
390                UserHandle user = new UserHandle(getChangingUserId());
391                final int n = mListeners.beginBroadcast();
392                for (int i = 0; i < n; i++) {
393                    IOnAppsChangedListener listener = mListeners.getBroadcastItem(i);
394                    UserHandle listeningUser = (UserHandle) mListeners.getBroadcastCookie(i);
395                    if (!isEnabledProfileOf(user, listeningUser, "onPackageRemoved")) continue;
396                    try {
397                        listener.onPackageRemoved(user, packageName);
398                    } catch (RemoteException re) {
399                        Slog.d(TAG, "Callback failed ", re);
400                    }
401                }
402                mListeners.finishBroadcast();
403
404                super.onPackageRemoved(packageName, uid);
405            }
406
407            @Override
408            public void onPackageModified(String packageName) {
409                UserHandle user = new UserHandle(getChangingUserId());
410                final int n = mListeners.beginBroadcast();
411                for (int i = 0; i < n; i++) {
412                    IOnAppsChangedListener listener = mListeners.getBroadcastItem(i);
413                    UserHandle listeningUser = (UserHandle) mListeners.getBroadcastCookie(i);
414                    if (!isEnabledProfileOf(user, listeningUser, "onPackageModified")) continue;
415                    try {
416                        listener.onPackageChanged(user, packageName);
417                    } catch (RemoteException re) {
418                        Slog.d(TAG, "Callback failed ", re);
419                    }
420                }
421                mListeners.finishBroadcast();
422
423                super.onPackageModified(packageName);
424            }
425
426            @Override
427            public void onPackagesAvailable(String[] packages) {
428                UserHandle user = new UserHandle(getChangingUserId());
429                final int n = mListeners.beginBroadcast();
430                for (int i = 0; i < n; i++) {
431                    IOnAppsChangedListener listener = mListeners.getBroadcastItem(i);
432                    UserHandle listeningUser = (UserHandle) mListeners.getBroadcastCookie(i);
433                    if (!isEnabledProfileOf(user, listeningUser, "onPackagesAvailable")) continue;
434                    try {
435                        listener.onPackagesAvailable(user, packages, isReplacing());
436                    } catch (RemoteException re) {
437                        Slog.d(TAG, "Callback failed ", re);
438                    }
439                }
440                mListeners.finishBroadcast();
441
442                super.onPackagesAvailable(packages);
443            }
444
445            @Override
446            public void onPackagesUnavailable(String[] packages) {
447                UserHandle user = new UserHandle(getChangingUserId());
448                final int n = mListeners.beginBroadcast();
449                for (int i = 0; i < n; i++) {
450                    IOnAppsChangedListener listener = mListeners.getBroadcastItem(i);
451                    UserHandle listeningUser = (UserHandle) mListeners.getBroadcastCookie(i);
452                    if (!isEnabledProfileOf(user, listeningUser, "onPackagesUnavailable")) continue;
453                    try {
454                        listener.onPackagesUnavailable(user, packages, isReplacing());
455                    } catch (RemoteException re) {
456                        Slog.d(TAG, "Callback failed ", re);
457                    }
458                }
459                mListeners.finishBroadcast();
460
461                super.onPackagesUnavailable(packages);
462            }
463
464        }
465
466        class PackageCallbackList<T extends IInterface> extends RemoteCallbackList<T> {
467            @Override
468            public void onCallbackDied(T callback, Object cookie) {
469                checkCallbackCount();
470            }
471        }
472    }
473}