/*
* Copyright (C) 2015 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.statementservice.retriever;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.res.Resources.NotFoundException;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
/**
* Class that provides information about an android app from {@link PackageManager}.
*
* Visible for testing.
*
* @hide
*/
public class AndroidPackageInfoFetcher {
/**
* The name of the metadata tag in AndroidManifest.xml that stores the associated asset array
* ID. The metadata tag should use the android:resource attribute to point to an array resource
* that contains the associated assets.
*/
private static final String ASSOCIATED_ASSETS_KEY = "associated_assets";
private Context mContext;
public AndroidPackageInfoFetcher(Context context) {
mContext = context;
}
/**
* Returns the Sha-256 fingerprints of all certificates from the specified package as a list of
* upper case HEX Strings with bytes separated by colons. Given an app {@link
* android.content.pm.Signature}, the fingerprint can be computed as {@link
* Utils#computeNormalizedSha256Fingerprint} {@code(signature.toByteArray())}.
*
* <p>Given a signed APK, Java 7's commandline keytool can compute the fingerprint using: {@code
* keytool -list -printcert -jarfile signed_app.apk}
*
* <p>Example: "10:39:38:EE:45:37:E5:9E:8E:E7:92:F6:54:50:4F:B8:34:6F:C6:B3:46:D0:BB:C4:41:5F:C3:39:FC:FC:8E:C1"
*
* @throws NameNotFoundException if an app with packageName is not installed on the device.
*/
public List<String> getCertFingerprints(String packageName) throws NameNotFoundException {
return Utils.getCertFingerprintsFromPackageManager(packageName, mContext);
}
/**
* Returns all statements that the specified package makes in its AndroidManifest.xml.
*
* @throws NameNotFoundException if the app is not installed on the device.
*/
public List<String> getStatements(String packageName) throws NameNotFoundException {
PackageInfo packageInfo = mContext.getPackageManager().getPackageInfo(
packageName, PackageManager.GET_META_DATA);
ApplicationInfo appInfo = packageInfo.applicationInfo;
if (appInfo.metaData == null) {
return Collections.<String>emptyList();
}
int tokenResourceId = appInfo.metaData.getInt(ASSOCIATED_ASSETS_KEY);
if (tokenResourceId == 0) {
return Collections.<String>emptyList();
}
try {
return Arrays.asList(
mContext.getPackageManager().getResourcesForApplication(packageName)
.getStringArray(tokenResourceId));
} catch (NotFoundException e) {
return Collections.<String>emptyList();
}
}
}