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 
17 package com.android.server.policy;
18 
19 import android.app.ActivityManager;
20 import android.content.Context;
21 import android.os.UserHandle;
22 import android.provider.Settings;
23 import android.util.ArraySet;
24 import android.util.Slog;
25 import android.view.View;
26 import android.view.WindowManager;
27 import android.view.WindowManager.LayoutParams;
28 
29 import com.android.server.policy.WindowManagerPolicy.WindowState;
30 
31 import java.io.PrintWriter;
32 import java.io.StringWriter;
33 
34 /**
35  * Runtime adjustments applied to the global window policy.
36  *
37  * This includes forcing immersive mode behavior for one or both system bars (based on a package
38  * list) and permanently disabling immersive mode confirmations for specific packages.
39  *
40  * Control by setting {@link Settings.Global#POLICY_CONTROL} to one or more name-value pairs.
41  * e.g.
42  *   to force immersive mode everywhere:
43  *     "immersive.full=*"
44  *   to force transient status for all apps except a specific package:
45  *     "immersive.status=apps,-com.package"
46  *   to disable the immersive mode confirmations for specific packages:
47  *     "immersive.preconfirms=com.package.one,com.package.two"
48  *
49  * Separate multiple name-value pairs with ':'
50  *   e.g. "immersive.status=apps:immersive.preconfirms=*"
51  */
52 public class PolicyControl {
53     private static String TAG = "PolicyControl";
54     private static boolean DEBUG = false;
55 
56     private static final String NAME_IMMERSIVE_FULL = "immersive.full";
57     private static final String NAME_IMMERSIVE_STATUS = "immersive.status";
58     private static final String NAME_IMMERSIVE_NAVIGATION = "immersive.navigation";
59     private static final String NAME_IMMERSIVE_PRECONFIRMATIONS = "immersive.preconfirms";
60 
61     private static String sSettingValue;
62     private static Filter sImmersivePreconfirmationsFilter;
63     private static Filter sImmersiveStatusFilter;
64     private static Filter sImmersiveNavigationFilter;
65 
getSystemUiVisibility(WindowState win, LayoutParams attrs)66     public static int getSystemUiVisibility(WindowState win, LayoutParams attrs) {
67         attrs = attrs != null ? attrs : win.getAttrs();
68         int vis = win != null ? win.getSystemUiVisibility()
69                 : (attrs.systemUiVisibility | attrs.subtreeSystemUiVisibility);
70         if (sImmersiveStatusFilter != null && sImmersiveStatusFilter.matches(attrs)) {
71             vis |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
72                     | View.SYSTEM_UI_FLAG_FULLSCREEN
73                     | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
74             vis &= ~(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
75                     | View.STATUS_BAR_TRANSLUCENT);
76         }
77         if (sImmersiveNavigationFilter != null && sImmersiveNavigationFilter.matches(attrs)) {
78             vis |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
79                     | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
80                     | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
81             vis &= ~(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
82                     | View.NAVIGATION_BAR_TRANSLUCENT);
83         }
84         return vis;
85     }
86 
getWindowFlags(WindowState win, LayoutParams attrs)87     public static int getWindowFlags(WindowState win, LayoutParams attrs) {
88         attrs = attrs != null ? attrs : win.getAttrs();
89         int flags = attrs.flags;
90         if (sImmersiveStatusFilter != null && sImmersiveStatusFilter.matches(attrs)) {
91             flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;
92             flags &= ~(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS
93                     | WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
94         }
95         if (sImmersiveNavigationFilter != null && sImmersiveNavigationFilter.matches(attrs)) {
96             flags &= ~WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION;
97         }
98         return flags;
99     }
100 
adjustClearableFlags(WindowState win, int clearableFlags)101     public static int adjustClearableFlags(WindowState win, int clearableFlags) {
102         final LayoutParams attrs = win != null ? win.getAttrs() : null;
103         if (sImmersiveStatusFilter != null && sImmersiveStatusFilter.matches(attrs)) {
104             clearableFlags &= ~View.SYSTEM_UI_FLAG_FULLSCREEN;
105         }
106         return clearableFlags;
107     }
108 
disableImmersiveConfirmation(String pkg)109     public static boolean disableImmersiveConfirmation(String pkg) {
110         return (sImmersivePreconfirmationsFilter != null
111                 && sImmersivePreconfirmationsFilter.matches(pkg))
112                 || ActivityManager.isRunningInTestHarness();
113     }
114 
reloadFromSetting(Context context)115     public static void reloadFromSetting(Context context) {
116         if (DEBUG) Slog.d(TAG, "reloadFromSetting()");
117         String value = null;
118         try {
119             value = Settings.Global.getStringForUser(context.getContentResolver(),
120                     Settings.Global.POLICY_CONTROL,
121                     UserHandle.USER_CURRENT);
122             if (sSettingValue != null && sSettingValue.equals(value)) return;
123             setFilters(value);
124             sSettingValue = value;
125         } catch (Throwable t) {
126             Slog.w(TAG, "Error loading policy control, value=" + value, t);
127         }
128     }
129 
dump(String prefix, PrintWriter pw)130     public static void dump(String prefix, PrintWriter pw) {
131         dump("sImmersiveStatusFilter", sImmersiveStatusFilter, prefix, pw);
132         dump("sImmersiveNavigationFilter", sImmersiveNavigationFilter, prefix, pw);
133         dump("sImmersivePreconfirmationsFilter", sImmersivePreconfirmationsFilter, prefix, pw);
134     }
135 
dump(String name, Filter filter, String prefix, PrintWriter pw)136     private static void dump(String name, Filter filter, String prefix, PrintWriter pw) {
137         pw.print(prefix); pw.print("PolicyControl."); pw.print(name); pw.print('=');
138         if (filter == null) {
139             pw.println("null");
140         } else {
141             filter.dump(pw); pw.println();
142         }
143     }
144 
setFilters(String value)145     private static void setFilters(String value) {
146         if (DEBUG) Slog.d(TAG, "setFilters: " + value);
147         sImmersiveStatusFilter = null;
148         sImmersiveNavigationFilter = null;
149         sImmersivePreconfirmationsFilter = null;
150         if (value != null) {
151             String[] nvps = value.split(":");
152             for (String nvp : nvps) {
153                 int i = nvp.indexOf('=');
154                 if (i == -1) continue;
155                 String n = nvp.substring(0, i);
156                 String v = nvp.substring(i + 1);
157                 if (n.equals(NAME_IMMERSIVE_FULL)) {
158                     Filter f = Filter.parse(v);
159                     sImmersiveStatusFilter = sImmersiveNavigationFilter = f;
160                     if (sImmersivePreconfirmationsFilter == null) {
161                         sImmersivePreconfirmationsFilter = f;
162                     }
163                 } else if (n.equals(NAME_IMMERSIVE_STATUS)) {
164                     Filter f = Filter.parse(v);
165                     sImmersiveStatusFilter = f;
166                 } else if (n.equals(NAME_IMMERSIVE_NAVIGATION)) {
167                     Filter f = Filter.parse(v);
168                     sImmersiveNavigationFilter = f;
169                     if (sImmersivePreconfirmationsFilter == null) {
170                         sImmersivePreconfirmationsFilter = f;
171                     }
172                 } else if (n.equals(NAME_IMMERSIVE_PRECONFIRMATIONS)) {
173                     Filter f = Filter.parse(v);
174                     sImmersivePreconfirmationsFilter = f;
175                 }
176             }
177         }
178         if (DEBUG) {
179             Slog.d(TAG, "immersiveStatusFilter: " + sImmersiveStatusFilter);
180             Slog.d(TAG, "immersiveNavigationFilter: " + sImmersiveNavigationFilter);
181             Slog.d(TAG, "immersivePreconfirmationsFilter: " + sImmersivePreconfirmationsFilter);
182         }
183     }
184 
185     private static class Filter {
186         private static final String ALL = "*";
187         private static final String APPS = "apps";
188 
189         private final ArraySet<String> mWhitelist;
190         private final ArraySet<String> mBlacklist;
191 
Filter(ArraySet<String> whitelist, ArraySet<String> blacklist)192         private Filter(ArraySet<String> whitelist, ArraySet<String> blacklist) {
193             mWhitelist = whitelist;
194             mBlacklist = blacklist;
195         }
196 
matches(LayoutParams attrs)197         boolean matches(LayoutParams attrs) {
198             if (attrs == null) return false;
199             boolean isApp = attrs.type >= WindowManager.LayoutParams.FIRST_APPLICATION_WINDOW
200                     && attrs.type <= WindowManager.LayoutParams.LAST_APPLICATION_WINDOW;
201             if (isApp && mBlacklist.contains(APPS)) return false;
202             if (onBlacklist(attrs.packageName)) return false;
203             if (isApp && mWhitelist.contains(APPS)) return true;
204             return onWhitelist(attrs.packageName);
205         }
206 
matches(String packageName)207         boolean matches(String packageName) {
208             return !onBlacklist(packageName) && onWhitelist(packageName);
209         }
210 
onBlacklist(String packageName)211         private boolean onBlacklist(String packageName) {
212             return mBlacklist.contains(packageName) || mBlacklist.contains(ALL);
213         }
214 
onWhitelist(String packageName)215         private boolean onWhitelist(String packageName) {
216             return mWhitelist.contains(ALL) || mWhitelist.contains(packageName);
217         }
218 
dump(PrintWriter pw)219         void dump(PrintWriter pw) {
220             pw.print("Filter[");
221             dump("whitelist", mWhitelist, pw); pw.print(',');
222             dump("blacklist", mBlacklist, pw); pw.print(']');
223         }
224 
dump(String name, ArraySet<String> set, PrintWriter pw)225         private void dump(String name, ArraySet<String> set, PrintWriter pw) {
226             pw.print(name); pw.print("=(");
227             final int n = set.size();
228             for (int i = 0; i < n; i++) {
229                 if (i > 0) pw.print(',');
230                 pw.print(set.valueAt(i));
231             }
232             pw.print(')');
233         }
234 
235         @Override
toString()236         public String toString() {
237             StringWriter sw = new StringWriter();
238             dump(new PrintWriter(sw, true));
239             return sw.toString();
240         }
241 
242         // value = comma-delimited list of tokens, where token = (package name|apps|*)
243         // e.g. "com.package1", or "apps, com.android.keyguard" or "*"
parse(String value)244         static Filter parse(String value) {
245             if (value == null) return null;
246             ArraySet<String> whitelist = new ArraySet<String>();
247             ArraySet<String> blacklist = new ArraySet<String>();
248             for (String token : value.split(",")) {
249                 token = token.trim();
250                 if (token.startsWith("-") && token.length() > 1) {
251                     token = token.substring(1);
252                     blacklist.add(token);
253                 } else {
254                     whitelist.add(token);
255                 }
256             }
257             return new Filter(whitelist, blacklist);
258         }
259     }
260 }
261