1 /*
<lambda>null2  * Copyright (C) 2021 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.permissioncontroller.permission.ui.model
18 
19 import android.app.Application
20 import androidx.lifecycle.AndroidViewModel
21 import androidx.lifecycle.LiveData
22 import androidx.lifecycle.MediatorLiveData
23 import com.android.permissioncontroller.permission.data.PermGroupsPackagesUiInfoLiveData
24 import com.android.permissioncontroller.permission.data.StandardPermGroupNamesLiveData
25 import com.android.permissioncontroller.permission.model.livedatatypes.PermGroupPackagesUiInfo
26 
27 /**
28  * A [androidx.lifecycle.ViewModel] for [ManagePermissionsFragment] and
29  * [ManagePermissionsOtherFragment]. However, [ManagePermissionsViewModel] is designed in a way so
30  * that its owner should be an [Activity][androidx.fragment.app.FragmentActivity] rather than
31  * individual [Fragments][androidx.fragment.app.Fragment], and the aforementioned Fragments that
32  * manage different sets of the permission groups should to share a single instance of
33  * [ManagePermissionsViewModel].
34  */
35 class ManagePermissionsViewModel(app: Application) : AndroidViewModel(app) {
36 
37     /** [LiveData] that contains a list of all platform-defined permission groups. */
38     val standardPermGroupsLiveData: LiveData<List<PermGroupPackagesUiInfo>> =
39         MediatorLiveData<List<PermGroupPackagesUiInfo>>().apply {
40             addSource(PermGroupsPackagesUiInfoLiveData(app, StandardPermGroupNamesLiveData)) {
41                 permGroups ->
42                 value = permGroups.values.filterNotNull()
43             }
44         }
45 
46     /**
47      * [LiveData] that contains a list of platform-defined permission groups, such that at least one
48      * the permissions in the group has been requested at runtime by at least one non-system
49      * application or has been pregranted to a non-system application.
50      *
51      * @see com.android.permissioncontroller.permission.ui.television.ManagePermissionsFragment
52      */
53     val usedPermissionGroups: LiveData<List<PermGroupPackagesUiInfo>> =
54         MediatorLiveData<List<PermGroupPackagesUiInfo>>().apply {
55             addSource(standardPermGroupsLiveData) { permGroups ->
56                 value = permGroups.filter { it.nonSystemUserSetOrPreGranted > 0 }
57             }
58         }
59 
60     /**
61      * [LiveData] that contains a list of platform-defined permission groups, such that all of the
62      * permissions in the group neither has been requested at runtime by any of the non-system
63      * applications nor has been pregranted to any such application. But at least one of the
64      * permissions in the group is requested by or pregranted to at least one system application,
65      * other than the Shell (we do not show permission groups that are granted only to the Shell,
66      * because it has all the permissions granted).
67      *
68      * @see com.android.permissioncontroller.permission.ui.television.ManagePermissionsOtherFragment
69      */
70     val unusedPermissionGroups: LiveData<List<PermGroupPackagesUiInfo>> =
71         MediatorLiveData<List<PermGroupPackagesUiInfo>>().apply {
72             addSource(standardPermGroupsLiveData) { permGroups ->
73                 value =
74                     permGroups
75                         .filter { it.nonSystemUserSetOrPreGranted == 0 }
76                         .filter { it.systemUserSetOrPreGranted > 0 }
77                         .filterNot { it.onlyShellPackageGranted }
78             }
79         }
80 
81     /**
82      * [LiveData] that contains a list of the application-defined permission groups (a.k.a. "custom"
83      * permissions), such that at least one of the permissions in the group has been requested at
84      * runtime by or has been pregranted to at least one application (system or non-system).
85      *
86      * @see com.android.permissioncontroller.permission.ui.television.ManagePermissionsOtherFragment
87      */
88     val additionalPermissionGroups: LiveData<List<PermGroupPackagesUiInfo>> =
89         MediatorLiveData<List<PermGroupPackagesUiInfo>>().apply {
90             addSource(PermGroupsPackagesUiInfoLiveData(app, UsedCustomPermGroupNamesLiveData())) {
91                 permGroups ->
92                 value =
93                     permGroups.values.filterNotNull().filter {
94                         (it.nonSystemUserSetOrPreGranted > 0) or (it.systemUserSetOrPreGranted > 0)
95                     }
96             }
97         }
98 
99     /**
100      * [LiveData] that indicates whether there any unused or additional permission groups.
101      *
102      * @see com.android.permissioncontroller.permission.ui.television.ManagePermissionsFragment
103      */
104     @get:JvmName("hasUnusedOrAdditionalPermissionGroups")
105     val hasUnusedOrAdditionalPermissionGroups: LiveData<Boolean> =
106         MediatorLiveData<Boolean>().apply {
107             val updateValue: (Any?) -> Unit = {
108                 value =
109                     !unusedPermissionGroups.value.isNullOrEmpty() ||
110                         !additionalPermissionGroups.value.isNullOrEmpty()
111             }
112             addSource(unusedPermissionGroups, updateValue)
113             addSource(additionalPermissionGroups, updateValue)
114         }
115 }
116