1 /*
2  * Copyright (C) 2018 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.wm;
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 java.io.PrintWriter;
30 import java.io.StringWriter;
31 
32 /**
33  * Runtime adjustments applied to the global window policy.
34  *
35  * This includes forcing immersive mode behavior for one or both system bars (based on a package
36  * list) and permanently disabling immersive mode confirmations for specific packages.
37  *
38  * Control by setting {@link Settings.Global#POLICY_CONTROL} to one or more name-value pairs.
39  * e.g.
40  *   to force immersive mode everywhere:
41  *     "immersive.full=*"
42  *   to force transient status for all apps except a specific package:
43  *     "immersive.status=apps,-com.package"
44  *   to disable the immersive mode confirmations for specific packages:
45  *     "immersive.preconfirms=com.package.one,com.package.two"
46  *
47  * Separate multiple name-value pairs with ':'
48  *   e.g. "immersive.status=apps:immersive.preconfirms=*"
49  */
50 class PolicyControl {
51     private static final String TAG = "PolicyControl";
52     private static final boolean DEBUG = false;
53 
54     private static final String NAME_IMMERSIVE_FULL = "immersive.full";
55     private static final String NAME_IMMERSIVE_STATUS = "immersive.status";
56     private static final String NAME_IMMERSIVE_NAVIGATION = "immersive.navigation";
57     private static final String NAME_IMMERSIVE_PRECONFIRMATIONS = "immersive.preconfirms";
58 
59     private static String sSettingValue;
60     private static Filter sImmersivePreconfirmationsFilter;
61     private static Filter sImmersiveStatusFilter;
62     private static Filter sImmersiveNavigationFilter;
63 
getSystemUiVisibility(WindowState win, LayoutParams attrs)64     static int getSystemUiVisibility(WindowState win, LayoutParams attrs) {
65         attrs = attrs != null ? attrs : win.getAttrs();
66         int vis = win != null ? win.getSystemUiVisibility()
67                 : (attrs.systemUiVisibility | attrs.subtreeSystemUiVisibility);
68         if (sImmersiveStatusFilter != null && sImmersiveStatusFilter.matches(attrs)) {
69             vis |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
70                     | View.SYSTEM_UI_FLAG_FULLSCREEN;
71             if (attrs.isFullscreen()) {
72                 vis |= View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
73             }
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_HIDE_NAVIGATION;
80             if (attrs.isFullscreen()) {
81                 vis |= View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
82             }
83             vis &= ~(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
84                     | View.NAVIGATION_BAR_TRANSLUCENT);
85         }
86         return vis;
87     }
88 
getWindowFlags(WindowState win, LayoutParams attrs)89     static int getWindowFlags(WindowState win, LayoutParams attrs) {
90         attrs = attrs != null ? attrs : win.getAttrs();
91         int flags = attrs.flags;
92         if (sImmersiveStatusFilter != null && sImmersiveStatusFilter.matches(attrs)) {
93             flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;
94             flags &= ~(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS
95                     | WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
96         }
97         if (sImmersiveNavigationFilter != null && sImmersiveNavigationFilter.matches(attrs)) {
98             flags &= ~WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION;
99         }
100         return flags;
101     }
102 
adjustClearableFlags(WindowState win, int clearableFlags)103     static int adjustClearableFlags(WindowState win, int clearableFlags) {
104         final LayoutParams attrs = win != null ? win.getAttrs() : null;
105         if (sImmersiveStatusFilter != null && sImmersiveStatusFilter.matches(attrs)) {
106             clearableFlags &= ~View.SYSTEM_UI_FLAG_FULLSCREEN;
107         }
108         return clearableFlags;
109     }
110 
disableImmersiveConfirmation(String pkg)111     static boolean disableImmersiveConfirmation(String pkg) {
112         return (sImmersivePreconfirmationsFilter != null
113                 && sImmersivePreconfirmationsFilter.matches(pkg))
114                 || ActivityManager.isRunningInTestHarness();
115     }
116 
reloadFromSetting(Context context)117     static boolean reloadFromSetting(Context context) {
118         if (DEBUG) Slog.d(TAG, "reloadFromSetting()");
119         String value = null;
120         try {
121             value = Settings.Global.getStringForUser(context.getContentResolver(),
122                     Settings.Global.POLICY_CONTROL,
123                     UserHandle.USER_CURRENT);
124             if (sSettingValue == value || sSettingValue != null && sSettingValue.equals(value)) {
125                 return false;
126             }
127             setFilters(value);
128             sSettingValue = value;
129         } catch (Throwable t) {
130             Slog.w(TAG, "Error loading policy control, value=" + value, t);
131             return false;
132         }
133         return true;
134     }
135 
dump(String prefix, PrintWriter pw)136     static void dump(String prefix, PrintWriter pw) {
137         dump("sImmersiveStatusFilter", sImmersiveStatusFilter, prefix, pw);
138         dump("sImmersiveNavigationFilter", sImmersiveNavigationFilter, prefix, pw);
139         dump("sImmersivePreconfirmationsFilter", sImmersivePreconfirmationsFilter, prefix, pw);
140     }
141 
dump(String name, Filter filter, String prefix, PrintWriter pw)142     private static void dump(String name, Filter filter, String prefix, PrintWriter pw) {
143         pw.print(prefix); pw.print("PolicyControl."); pw.print(name); pw.print('=');
144         if (filter == null) {
145             pw.println("null");
146         } else {
147             filter.dump(pw); pw.println();
148         }
149     }
150 
setFilters(String value)151     private static void setFilters(String value) {
152         if (DEBUG) Slog.d(TAG, "setFilters: " + value);
153         sImmersiveStatusFilter = null;
154         sImmersiveNavigationFilter = null;
155         sImmersivePreconfirmationsFilter = null;
156         if (value != null) {
157             String[] nvps = value.split(":");
158             for (String nvp : nvps) {
159                 int i = nvp.indexOf('=');
160                 if (i == -1) continue;
161                 String n = nvp.substring(0, i);
162                 String v = nvp.substring(i + 1);
163                 if (n.equals(NAME_IMMERSIVE_FULL)) {
164                     Filter f = Filter.parse(v);
165                     sImmersiveStatusFilter = sImmersiveNavigationFilter = f;
166                     if (sImmersivePreconfirmationsFilter == null) {
167                         sImmersivePreconfirmationsFilter = f;
168                     }
169                 } else if (n.equals(NAME_IMMERSIVE_STATUS)) {
170                     Filter f = Filter.parse(v);
171                     sImmersiveStatusFilter = f;
172                 } else if (n.equals(NAME_IMMERSIVE_NAVIGATION)) {
173                     Filter f = Filter.parse(v);
174                     sImmersiveNavigationFilter = f;
175                     if (sImmersivePreconfirmationsFilter == null) {
176                         sImmersivePreconfirmationsFilter = f;
177                     }
178                 } else if (n.equals(NAME_IMMERSIVE_PRECONFIRMATIONS)) {
179                     Filter f = Filter.parse(v);
180                     sImmersivePreconfirmationsFilter = f;
181                 }
182             }
183         }
184         if (DEBUG) {
185             Slog.d(TAG, "immersiveStatusFilter: " + sImmersiveStatusFilter);
186             Slog.d(TAG, "immersiveNavigationFilter: " + sImmersiveNavigationFilter);
187             Slog.d(TAG, "immersivePreconfirmationsFilter: " + sImmersivePreconfirmationsFilter);
188         }
189     }
190 
191     private static class Filter {
192         private static final String ALL = "*";
193         private static final String APPS = "apps";
194 
195         private final ArraySet<String> mWhitelist;
196         private final ArraySet<String> mBlacklist;
197 
Filter(ArraySet<String> whitelist, ArraySet<String> blacklist)198         private Filter(ArraySet<String> whitelist, ArraySet<String> blacklist) {
199             mWhitelist = whitelist;
200             mBlacklist = blacklist;
201         }
202 
matches(LayoutParams attrs)203         boolean matches(LayoutParams attrs) {
204             if (attrs == null) return false;
205             boolean isApp = attrs.type >= WindowManager.LayoutParams.FIRST_APPLICATION_WINDOW
206                     && attrs.type <= WindowManager.LayoutParams.LAST_APPLICATION_WINDOW;
207             if (isApp && mBlacklist.contains(APPS)) return false;
208             if (onBlacklist(attrs.packageName)) return false;
209             if (isApp && mWhitelist.contains(APPS)) return true;
210             return onWhitelist(attrs.packageName);
211         }
212 
matches(String packageName)213         boolean matches(String packageName) {
214             return !onBlacklist(packageName) && onWhitelist(packageName);
215         }
216 
onBlacklist(String packageName)217         private boolean onBlacklist(String packageName) {
218             return mBlacklist.contains(packageName) || mBlacklist.contains(ALL);
219         }
220 
onWhitelist(String packageName)221         private boolean onWhitelist(String packageName) {
222             return mWhitelist.contains(ALL) || mWhitelist.contains(packageName);
223         }
224 
dump(PrintWriter pw)225         void dump(PrintWriter pw) {
226             pw.print("Filter[");
227             dump("whitelist", mWhitelist, pw); pw.print(',');
228             dump("blacklist", mBlacklist, pw); pw.print(']');
229         }
230 
dump(String name, ArraySet<String> set, PrintWriter pw)231         private void dump(String name, ArraySet<String> set, PrintWriter pw) {
232             pw.print(name); pw.print("=(");
233             final int n = set.size();
234             for (int i = 0; i < n; i++) {
235                 if (i > 0) pw.print(',');
236                 pw.print(set.valueAt(i));
237             }
238             pw.print(')');
239         }
240 
241         @Override
toString()242         public String toString() {
243             StringWriter sw = new StringWriter();
244             dump(new PrintWriter(sw, true));
245             return sw.toString();
246         }
247 
248         // value = comma-delimited list of tokens, where token = (package name|apps|*)
249         // e.g. "com.package1", or "apps, com.android.keyguard" or "*"
parse(String value)250         static Filter parse(String value) {
251             if (value == null) return null;
252             ArraySet<String> whitelist = new ArraySet<String>();
253             ArraySet<String> blacklist = new ArraySet<String>();
254             for (String token : value.split(",")) {
255                 token = token.trim();
256                 if (token.startsWith("-") && token.length() > 1) {
257                     token = token.substring(1);
258                     blacklist.add(token);
259                 } else {
260                     whitelist.add(token);
261                 }
262             }
263             return new Filter(whitelist, blacklist);
264         }
265     }
266 }
267