1/*
2 * Copyright (C) 2015 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.settings.applications;
18
19import android.content.Context;
20import android.content.pm.ApplicationInfo;
21import android.content.pm.PackageInfo;
22import android.content.pm.PackageManager;
23import android.content.pm.PackageManager.NameNotFoundException;
24import android.content.pm.PermissionInfo;
25import android.os.Build;
26import android.util.ArrayMap;
27import android.util.Log;
28
29import java.util.ArrayList;
30import java.util.List;
31
32/**
33 * Based off from
34 * packages/apps/PackageInstaller/src/com/android/packageinstaller/permission/AppPermissions.java
35 * Except we only care about the number rather than the details.
36 */
37public final class AppPermissions {
38    private static final String TAG = "AppPermissions";
39
40    private final ArrayMap<String, PermissionGroup> mGroups = new ArrayMap<>();
41    private final Context mContext;
42    private final PackageInfo mPackageInfo;
43
44    public AppPermissions(Context context, String packageName) {
45        mContext = context;
46        mPackageInfo = getPackageInfo(packageName);
47        refresh();
48    }
49
50    private PackageInfo getPackageInfo(String packageName) {
51        try {
52            return mContext.getPackageManager().getPackageInfo(packageName,
53                    PackageManager.GET_PERMISSIONS);
54        } catch (NameNotFoundException e) {
55            Log.e(TAG, "Unable to find " + packageName, e);
56            return null;
57        }
58    }
59
60    public void refresh() {
61        if (mPackageInfo != null) {
62            loadPermissionGroups();
63        }
64    }
65
66    public int getPermissionCount() {
67        return mGroups.size();
68    }
69
70    public int getGrantedPermissionsCount() {
71        int ct = 0;
72        for (int i = 0; i < mGroups.size(); i++) {
73            if (mGroups.valueAt(i).areRuntimePermissionsGranted()) {
74                ct++;
75            }
76        }
77        return ct;
78    }
79
80    private void loadPermissionGroups() {
81        mGroups.clear();
82        if (mPackageInfo.requestedPermissions == null) {
83            return;
84        }
85
86        final boolean appSupportsRuntimePermissions = appSupportsRuntime(
87                mPackageInfo.applicationInfo);
88
89        for (int i = 0; i < mPackageInfo.requestedPermissions.length; i++) {
90            String requestedPerm = mPackageInfo.requestedPermissions[i];
91
92            final PermissionInfo permInfo;
93            try {
94                permInfo = mContext.getPackageManager().getPermissionInfo(requestedPerm, 0);
95            } catch (NameNotFoundException e) {
96                Log.w(TAG, "Unknown permission: " + requestedPerm);
97                continue;
98            }
99
100            String permName = permInfo.name;
101            String groupName = permInfo.group != null ? permInfo.group : permName;
102
103            PermissionGroup group = mGroups.get(groupName);
104            if (group == null) {
105                group = new PermissionGroup();
106                mGroups.put(groupName, group);
107            }
108
109            final boolean runtime = appSupportsRuntimePermissions
110                    && permInfo.protectionLevel == PermissionInfo.PROTECTION_DANGEROUS;
111            final boolean granted = (mPackageInfo.requestedPermissionsFlags[i]
112                    & PackageInfo.REQUESTED_PERMISSION_GRANTED) != 0;
113
114            Permission permission = new Permission(runtime, granted);
115            group.addPermission(permission, permName);
116        }
117        // Only care about runtime perms for now.
118        for (int i = mGroups.size() - 1; i >= 0; i--) {
119            if (!mGroups.valueAt(i).mHasRuntimePermissions) {
120                mGroups.removeAt(i);
121            }
122        }
123    }
124
125    public static boolean appSupportsRuntime(ApplicationInfo info) {
126        return info.targetSdkVersion > Build.VERSION_CODES.LOLLIPOP_MR1;
127    }
128
129    private static final class PermissionGroup {
130        private final ArrayMap<String, Permission> mPermissions = new ArrayMap<>();
131        private boolean mHasRuntimePermissions;
132
133        public boolean hasRuntimePermissions() {
134            return mHasRuntimePermissions;
135        }
136
137        public boolean areRuntimePermissionsGranted() {
138            final int permissionCount = mPermissions.size();
139            for (int i = 0; i < permissionCount; i++) {
140                Permission permission = mPermissions.valueAt(i);
141                if (permission.runtime && !permission.granted) {
142                    return false;
143                }
144            }
145            return true;
146        }
147
148        public List<Permission> getPermissions() {
149            return new ArrayList<>(mPermissions.values());
150        }
151
152        void addPermission(Permission permission, String permName) {
153            mPermissions.put(permName, permission);
154            if (permission.runtime) {
155                mHasRuntimePermissions = true;
156            }
157        }
158    }
159
160    private static final class Permission {
161        private final boolean runtime;
162        private boolean granted;
163
164        public Permission(boolean runtime, boolean granted) {
165            this.runtime = runtime;
166            this.granted = granted;
167        }
168    }
169}
170