1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.permissioncontroller.permission.data
import android.app.Application
import android.content.pm.PackageManager.NameNotFoundException
import android.content.res.Resources.ID_NULL
import android.os.UserHandle
import android.util.Log
import com.android.permissioncontroller.PermissionControllerApplication
import java.io.FileNotFoundException
import kotlinx.coroutines.Job
import org.xmlpull.v1.XmlPullParser
import org.xmlpull.v1.XmlPullParser.END_DOCUMENT
import org.xmlpull.v1.XmlPullParser.END_TAG
import org.xmlpull.v1.XmlPullParser.START_TAG
private const val MANIFEST_FILE_NAME = "AndroidManifest.xml"
private const val MANIFEST_TAG = "manifest"
private const val PKG_ATTR = "package"
private const val ATTRIBUTION_TAG = "attribution"
private const val ANDROID_NS = "http://schemas.android.com/apk/res/android"
private const val TAG_ATTR = "tag"
private const val LABEL_ATTR = "label"
/**
* Label-resource-id of an attribution of a package/user.
*
* <p>Obviously the resource is found in the package, hence needs to be loaded via a Resources
* object created for this package.
*/
class AttributionLabelLiveData
private constructor(
private val app: Application,
private val attributionTag: String?,
private val packageName: String,
private val user: UserHandle
) : SmartAsyncMediatorLiveData<Int>(), PackageBroadcastReceiver.PackageBroadcastListener {
private val LOG_TAG = AttributionLabelLiveData::class.java.simpleName
override suspend fun loadDataAndPostValue(job: Job) {
if (job.isCancelled) {
return
}
if (attributionTag == null) {
postValue(ID_NULL)
return
}
val pkgContext =
try {
app.createPackageContextAsUser(packageName, 0, user)
} catch (e: NameNotFoundException) {
Log.e(LOG_TAG, "Cannot find $packageName for $user")
postValue(null)
return
}
// TODO (moltmann): Read this from PackageInfo once available
var cookie = 0
while (true) {
// Some resources have multiple "AndroidManifest.xml" loaded and hence we need
// to find the right one
cookie++
val parser =
try {
pkgContext.assets.openXmlResourceParser(cookie, MANIFEST_FILE_NAME)
} catch (e: FileNotFoundException) {
break
}
try {
do {
if (parser.eventType != START_TAG) {
continue
}
if (parser.name != MANIFEST_TAG) {
parser.skipTag()
continue
}
// Ensure this is the right manifest
if (parser.getAttributeValue(null, PKG_ATTR) != packageName) {
break
}
while (parser.next() != END_TAG) {
if (parser.eventType != START_TAG) {
continue
}
if (parser.name != ATTRIBUTION_TAG) {
parser.skipTag()
continue
}
if (parser.getAttributeValue(ANDROID_NS, TAG_ATTR) == attributionTag) {
postValue(
parser.getAttributeResourceValue(ANDROID_NS, LABEL_ATTR, ID_NULL)
)
return
} else {
parser.skipTag()
}
}
} while (parser.next() != END_DOCUMENT)
} finally {
parser.close()
}
}
postValue(null)
}
/** Skip tag parser is currently pointing to (including all tags nested in it) */
private fun XmlPullParser.skipTag() {
var depth = 1
while (depth != 0) {
when (next()) {
END_TAG -> depth--
START_TAG -> depth++
}
}
}
override fun onActive() {
super.onActive()
// Listen for changes to the attributions
PackageBroadcastReceiver.addChangeCallback(packageName, this)
update()
}
override fun onInactive() {
super.onInactive()
PackageBroadcastReceiver.removeChangeCallback(packageName, this)
}
override fun onPackageUpdate(packageName: String) {
update()
}
/**
* Repository for AttributionLiveData.
*
* <p> Key value is a pair of string attribution tag, string package name, user handle, value is
* its corresponding LiveData.
*/
companion object :
DataRepository<Triple<String?, String, UserHandle>, AttributionLabelLiveData>() {
override fun newValue(key: Triple<String?, String, UserHandle>): AttributionLabelLiveData {
return AttributionLabelLiveData(
PermissionControllerApplication.get(),
key.first,
key.second,
key.third
)
}
operator fun get(
attributionTag: String?,
packageName: String,
user: UserHandle
): AttributionLabelLiveData = get(Triple(attributionTag, packageName, user))
}
}
|
