IntentForwarderActivity.java revision 0e2b73f6858479ca963bd53c49f8955d98f14869 
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.internal.app;
18
19import static android.content.pm.PackageManager.MATCH_DEFAULT_ONLY;
20
21import android.app.Activity;
22import android.app.ActivityManagerNative;
23import android.app.ActivityThread;
24import android.app.AppGlobals;
25import android.app.admin.DevicePolicyManager;
26import android.content.Context;
27import android.content.Intent;
28import android.content.pm.IPackageManager;
29import android.content.pm.UserInfo;
30import android.os.Bundle;
31import android.os.Process;
32import android.os.RemoteException;
33import android.os.UserHandle;
34import android.os.UserManager;
35import android.util.Slog;
36import android.widget.Toast;
37
38import java.util.List;
39
40/**
41 * This is used in conjunction with
42 * {@link DevicePolicyManager#addCrossProfileIntentFilter} to enable intents to
43 * be passed in and out of a managed profile.
44 */
45public class IntentForwarderActivity extends Activity  {
46
47    public static String TAG = "IntentForwarderActivity";
48
49    public static String FORWARD_INTENT_TO_USER_OWNER
50            = "com.android.internal.app.ForwardIntentToUserOwner";
51
52    public static String FORWARD_INTENT_TO_MANAGED_PROFILE
53            = "com.android.internal.app.ForwardIntentToManagedProfile";
54
55    @Override
56    protected void onCreate(Bundle savedInstanceState) {
57        super.onCreate(savedInstanceState);
58        Intent intentReceived = getIntent();
59
60        String className = intentReceived.getComponent().getClassName();
61        final int targetUserId;
62        final int userMessageId;
63
64        if (className.equals(FORWARD_INTENT_TO_USER_OWNER)) {
65            userMessageId = com.android.internal.R.string.forward_intent_to_owner;
66            targetUserId = UserHandle.USER_OWNER;
67        } else if (className.equals(FORWARD_INTENT_TO_MANAGED_PROFILE)) {
68            userMessageId = com.android.internal.R.string.forward_intent_to_work;
69            targetUserId = getManagedProfile();
70        } else {
71            Slog.wtf(TAG, IntentForwarderActivity.class.getName() + " cannot be called directly");
72            userMessageId = -1;
73            targetUserId = UserHandle.USER_NULL;
74        }
75        if (targetUserId == UserHandle.USER_NULL) {
76            // This covers the case where there is no managed profile.
77            finish();
78            return;
79        }
80        Intent newIntent = new Intent(intentReceived);
81        newIntent.setComponent(null);
82        // Apps should not be allowed to target a specific package in the target user.
83        newIntent.setPackage(null);
84        newIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT
85                |Intent.FLAG_ACTIVITY_PREVIOUS_IS_TOP);
86        int callingUserId = getUserId();
87
88        if (canForward(newIntent, targetUserId)) {
89            if (newIntent.getAction().equals(Intent.ACTION_CHOOSER)) {
90                Intent innerIntent = (Intent) newIntent.getParcelableExtra(Intent.EXTRA_INTENT);
91                innerIntent.setContentUserHint(callingUserId);
92            } else {
93                newIntent.setContentUserHint(callingUserId);
94            }
95
96            final android.content.pm.ResolveInfo ri = getPackageManager().resolveActivityAsUser(
97                        newIntent, MATCH_DEFAULT_ONLY, targetUserId);
98
99            // Only show a disclosure if this is a normal (non-OS) app
100            final boolean shouldShowDisclosure =
101                    !UserHandle.isSameApp(ri.activityInfo.applicationInfo.uid, Process.SYSTEM_UID);
102
103            try {
104                startActivityAsCaller(newIntent, null, targetUserId);
105            } catch (RuntimeException e) {
106                int launchedFromUid = -1;
107                String launchedFromPackage = "?";
108                try {
109                    launchedFromUid = ActivityManagerNative.getDefault().getLaunchedFromUid(
110                            getActivityToken());
111                    launchedFromPackage = ActivityManagerNative.getDefault().getLaunchedFromPackage(
112                            getActivityToken());
113                } catch (RemoteException ignored) {
114                }
115
116                Slog.wtf(TAG, "Unable to launch as UID " + launchedFromUid + " package "
117                        + launchedFromPackage + ", while running in "
118                        + ActivityThread.currentProcessName(), e);
119            }
120
121            if (shouldShowDisclosure) {
122                Toast.makeText(this, getString(userMessageId), Toast.LENGTH_LONG).show();
123            }
124        } else {
125            Slog.wtf(TAG, "the intent: " + newIntent + "cannot be forwarded from user "
126                    + callingUserId + " to user " + targetUserId);
127        }
128        finish();
129    }
130
131    boolean canForward(Intent intent, int targetUserId)  {
132        IPackageManager ipm = AppGlobals.getPackageManager();
133        if (intent.getAction().equals(Intent.ACTION_CHOOSER)) {
134            // The EXTRA_INITIAL_INTENTS may not be allowed to be forwarded.
135            if (intent.hasExtra(Intent.EXTRA_INITIAL_INTENTS)) {
136                Slog.wtf(TAG, "An chooser intent with extra initial intents cannot be forwarded to"
137                        + " a different user");
138                return false;
139            }
140            if (intent.hasExtra(Intent.EXTRA_REPLACEMENT_EXTRAS)) {
141                Slog.wtf(TAG, "A chooser intent with replacement extras cannot be forwarded to a"
142                        + " different user");
143                return false;
144            }
145            intent = (Intent) intent.getParcelableExtra(Intent.EXTRA_INTENT);
146        }
147        String resolvedType = intent.resolveTypeIfNeeded(getContentResolver());
148        if (intent.getSelector() != null) {
149            intent = intent.getSelector();
150        }
151        try {
152            return ipm.canForwardTo(intent, resolvedType, getUserId(),
153                    targetUserId);
154        } catch (RemoteException e) {
155            Slog.e(TAG, "PackageManagerService is dead?");
156            return false;
157        }
158    }
159
160    /**
161     * Returns the userId of the managed profile for this device or UserHandle.USER_NULL if there is
162     * no managed profile.
163     *
164     * TODO: Remove the assumption that there is only one managed profile
165     * on the device.
166     */
167    private int getManagedProfile() {
168        UserManager userManager = (UserManager) getSystemService(Context.USER_SERVICE);
169        List<UserInfo> relatedUsers = userManager.getProfiles(UserHandle.USER_OWNER);
170        for (UserInfo userInfo : relatedUsers) {
171            if (userInfo.isManagedProfile()) return userInfo.id;
172        }
173        Slog.wtf(TAG, FORWARD_INTENT_TO_MANAGED_PROFILE
174                + " has been called, but there is no managed profile");
175        return UserHandle.USER_NULL;
176    }
177}
178