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PackageManagerUtils.java
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PackageManagerUtils.java
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/*
* 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.
*/
#if (${PACKAGE_NAME} != "")package ${PACKAGE_NAME};#end
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import android.support.annotation.NonNull;
import com.google.common.io.BaseEncoding;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* Provides utility logic for getting the app's SHA1 signature. Used with restricted API keys.
*
*/
public class PackageManagerUtils {
/**
* Gets the SHA1 signature, hex encoded for inclusion with restricted API requests. Send it in a custom header together with package name
*
* @param packageName Identifies the APK whose signature should be extracted.
* @return a lowercase, hex-encoded
*/
public static String getSignature(@NonNull PackageManager pm, @NonNull String packageName) {
try {
PackageInfo packageInfo = pm.getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
if (packageInfo == null
|| packageInfo.signatures == null
|| packageInfo.signatures.length == 0
|| packageInfo.signatures[0] == null) {
return null;
}
return signatureDigest(packageInfo.signatures[0]);
} catch (PackageManager.NameNotFoundException e) {
return null;
}
}
private static String signatureDigest(Signature sig) {
byte[] signature = sig.toByteArray();
try {
MessageDigest md = MessageDigest.getInstance("SHA1");
byte[] digest = md.digest(signature);
return BaseEncoding.base16().lowerCase().encode(digest);
} catch (NoSuchAlgorithmException e) {
return null;
}
}
}