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
17package com.android.settings;
18
19import android.content.ComponentName;
20import android.content.pm.PackageManager;
21import android.content.pm.ResolveInfo;
22import android.content.res.Resources;
23import android.content.res.TypedArray;
24import android.content.res.XmlResourceParser;
25import android.service.trust.TrustAgentService;
26import android.util.AttributeSet;
27import android.util.Slog;
28import android.util.Xml;
29
30import org.xmlpull.v1.XmlPullParser;
31import org.xmlpull.v1.XmlPullParserException;
32
33import java.io.IOException;
34
35import static com.android.settingslib.RestrictedLockUtils.EnforcedAdmin;
36
37// TODO(b/34461256): Refactor TrustAgentUtils into TrustAgentManager.
38public class TrustAgentUtils {
39    static final String TAG = "TrustAgentUtils";
40
41    private static final String TRUST_AGENT_META_DATA = TrustAgentService.TRUST_AGENT_META_DATA;
42
43    public static class TrustAgentComponentInfo {
44        ComponentName componentName;
45        String title;
46        String summary;
47        EnforcedAdmin admin = null;
48    }
49
50    public static ComponentName getComponentName(ResolveInfo resolveInfo) {
51        if (resolveInfo == null || resolveInfo.serviceInfo == null) return null;
52        return new ComponentName(resolveInfo.serviceInfo.packageName, resolveInfo.serviceInfo.name);
53    }
54
55    public static TrustAgentComponentInfo getSettingsComponent(
56            PackageManager pm, ResolveInfo resolveInfo) {
57        if (resolveInfo == null || resolveInfo.serviceInfo == null
58                || resolveInfo.serviceInfo.metaData == null) return null;
59        String cn = null;
60        TrustAgentComponentInfo trustAgentComponentInfo = new TrustAgentComponentInfo();
61        XmlResourceParser parser = null;
62        Exception caughtException = null;
63        try {
64            parser = resolveInfo.serviceInfo.loadXmlMetaData(pm, TRUST_AGENT_META_DATA);
65            if (parser == null) {
66                Slog.w(TAG, "Can't find " + TRUST_AGENT_META_DATA + " meta-data");
67                return null;
68            }
69            Resources res = pm.getResourcesForApplication(resolveInfo.serviceInfo.applicationInfo);
70            AttributeSet attrs = Xml.asAttributeSet(parser);
71            int type;
72            while ((type = parser.next()) != XmlPullParser.END_DOCUMENT
73                    && type != XmlPullParser.START_TAG) {
74            }
75            String nodeName = parser.getName();
76            if (!"trust-agent".equals(nodeName)) {
77                Slog.w(TAG, "Meta-data does not start with trust-agent tag");
78                return null;
79            }
80            TypedArray sa =
81                    res.obtainAttributes(attrs, com.android.internal.R.styleable.TrustAgent);
82            trustAgentComponentInfo.summary =
83                    sa.getString(com.android.internal.R.styleable.TrustAgent_summary);
84            trustAgentComponentInfo.title =
85                    sa.getString(com.android.internal.R.styleable.TrustAgent_title);
86            cn = sa.getString(com.android.internal.R.styleable.TrustAgent_settingsActivity);
87            sa.recycle();
88        } catch (PackageManager.NameNotFoundException e) {
89            caughtException = e;
90        } catch (IOException e) {
91            caughtException = e;
92        } catch (XmlPullParserException e) {
93            caughtException = e;
94        } finally {
95            if (parser != null) parser.close();
96        }
97        if (caughtException != null) {
98            Slog.w(TAG, "Error parsing : " + resolveInfo.serviceInfo.packageName, caughtException);
99            return null;
100        }
101        if (cn != null && cn.indexOf('/') < 0) {
102            cn = resolveInfo.serviceInfo.packageName + "/" + cn;
103        }
104        trustAgentComponentInfo.componentName = (cn == null) ? null : ComponentName.unflattenFromString(cn);
105        return trustAgentComponentInfo;
106    }
107}
108