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/*
* Copyright (C) 2014 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.settings;
import android.content.ComponentName;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.content.res.XmlResourceParser;
import android.service.trust.TrustAgentService;
import android.util.AttributeSet;
import android.util.Log;
import android.util.Slog;
import android.util.Xml;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import java.io.IOException;
public class TrustAgentUtils {
static final String TAG = "TrustAgentUtils";
private static final String TRUST_AGENT_META_DATA = TrustAgentService.TRUST_AGENT_META_DATA;
private static final String PERMISSION_PROVIDE_AGENT = android.Manifest.permission.PROVIDE_TRUST_AGENT;
/**
* @return true, if the service in resolveInfo has the permission to provide a trust agent.
*/
public static boolean checkProvidePermission(ResolveInfo resolveInfo, PackageManager pm) {
String packageName = resolveInfo.serviceInfo.packageName;
if (pm.checkPermission(PERMISSION_PROVIDE_AGENT, packageName)
!= PackageManager.PERMISSION_GRANTED) {
Log.w(TAG, "Skipping agent because package " + packageName
+ " does not have permission " + PERMISSION_PROVIDE_AGENT + ".");
return false;
}
return true;
}
public static class TrustAgentComponentInfo {
ComponentName componentName;
public String title;
String summary;
boolean disabledByAdministrator;
}
public static ComponentName getComponentName(ResolveInfo resolveInfo) {
if (resolveInfo == null || resolveInfo.serviceInfo == null) return null;
return new ComponentName(resolveInfo.serviceInfo.packageName, resolveInfo.serviceInfo.name);
}
public static TrustAgentComponentInfo getSettingsComponent(
PackageManager pm, ResolveInfo resolveInfo) {
if (resolveInfo == null || resolveInfo.serviceInfo == null
|| resolveInfo.serviceInfo.metaData == null) return null;
String cn = null;
TrustAgentComponentInfo trustAgentComponentInfo = new TrustAgentComponentInfo();
XmlResourceParser parser = null;
Exception caughtException = null;
try {
parser = resolveInfo.serviceInfo.loadXmlMetaData(pm, TRUST_AGENT_META_DATA);
if (parser == null) {
Slog.w(TAG, "Can't find " + TRUST_AGENT_META_DATA + " meta-data");
return null;
}
Resources res = pm.getResourcesForApplication(resolveInfo.serviceInfo.applicationInfo);
AttributeSet attrs = Xml.asAttributeSet(parser);
int type;
while ((type = parser.next()) != XmlPullParser.END_DOCUMENT
&& type != XmlPullParser.START_TAG) {
}
String nodeName = parser.getName();
if (!"trust-agent".equals(nodeName)) {
Slog.w(TAG, "Meta-data does not start with trust-agent tag");
return null;
}
TypedArray sa =
res.obtainAttributes(attrs, com.android.internal.R.styleable.TrustAgent);
trustAgentComponentInfo.summary =
sa.getString(com.android.internal.R.styleable.TrustAgent_summary);
trustAgentComponentInfo.title =
sa.getString(com.android.internal.R.styleable.TrustAgent_title);
cn = sa.getString(com.android.internal.R.styleable.TrustAgent_settingsActivity);
sa.recycle();
} catch (PackageManager.NameNotFoundException e) {
caughtException = e;
} catch (IOException e) {
caughtException = e;
} catch (XmlPullParserException e) {
caughtException = e;
} finally {
if (parser != null) parser.close();
}
if (caughtException != null) {
Slog.w(TAG, "Error parsing : " + resolveInfo.serviceInfo.packageName, caughtException);
return null;
}
if (cn != null && cn.indexOf('/') < 0) {
cn = resolveInfo.serviceInfo.packageName + "/" + cn;
}
trustAgentComponentInfo.componentName = (cn == null) ? null : ComponentName.unflattenFromString(cn);
return trustAgentComponentInfo;
}
}
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