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Move PendingIntent creation into factory

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This commit is contained in:
Dominik Schürmann
2016-02-15 17:43:18 +01:00
parent 15488c5445
commit d1eacf9b27
3 changed files with 201 additions and 140 deletions
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166
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/ApiPendingIntentFactory.java Normal file
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@@ -0,0 +1,166 @@
/*
* Copyright (C) 2016 Dominik Schürmann <dominik@dominikschuermann.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.remote;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import org.sufficientlysecure.keychain.provider.KeychainContract;
import org.sufficientlysecure.keychain.remote.ui.RemoteCreateAccountActivity;
import org.sufficientlysecure.keychain.remote.ui.RemoteErrorActivity;
import org.sufficientlysecure.keychain.remote.ui.RemoteImportKeysActivity;
import org.sufficientlysecure.keychain.remote.ui.RemotePassphraseDialogActivity;
import org.sufficientlysecure.keychain.remote.ui.RemoteRegisterActivity;
import org.sufficientlysecure.keychain.remote.ui.RemoteSecurityTokenOperationActivity;
import org.sufficientlysecure.keychain.remote.ui.RemoteSelectPubKeyActivity;
import org.sufficientlysecure.keychain.remote.ui.SelectAllowedKeysActivity;
import org.sufficientlysecure.keychain.remote.ui.SelectSignKeyIdActivity;
import org.sufficientlysecure.keychain.service.input.CryptoInputParcel;
import org.sufficientlysecure.keychain.service.input.RequiredInputParcel;
import org.sufficientlysecure.keychain.ui.ViewKeyActivity;
import java.util.ArrayList;
public class ApiPendingIntentFactory {
Context mContext;
private Intent mPendingIntentData;
public ApiPendingIntentFactory(Context context, Intent data) {
mContext = context;
mPendingIntentData = data;
}
PendingIntent requiredInputPi(RequiredInputParcel requiredInput,
CryptoInputParcel cryptoInput) {
switch (requiredInput.mType) {
case NFC_MOVE_KEY_TO_CARD:
case NFC_DECRYPT:
case NFC_SIGN: {
return nfc(requiredInput, cryptoInput);
}
case PASSPHRASE: {
return passphrase(requiredInput, cryptoInput);
}
default:
throw new AssertionError("Unhandled required input type!");
}
}
private PendingIntent nfc(RequiredInputParcel requiredInput, CryptoInputParcel cryptoInput) {
Intent intent = new Intent(mContext, RemoteSecurityTokenOperationActivity.class);
// pass params through to activity that it can be returned again later to repeat pgp operation
intent.putExtra(RemoteSecurityTokenOperationActivity.EXTRA_REQUIRED_INPUT, requiredInput);
intent.putExtra(RemoteSecurityTokenOperationActivity.EXTRA_CRYPTO_INPUT, cryptoInput);
return build(intent);
}
private PendingIntent passphrase(RequiredInputParcel requiredInput, CryptoInputParcel cryptoInput) {
Intent intent = new Intent(mContext, RemotePassphraseDialogActivity.class);
// pass params through to activity that it can be returned again later to repeat pgp operation
intent.putExtra(RemotePassphraseDialogActivity.EXTRA_REQUIRED_INPUT, requiredInput);
intent.putExtra(RemotePassphraseDialogActivity.EXTRA_CRYPTO_INPUT, cryptoInput);
return build(intent);
}
PendingIntent selectPublicKey(long[] keyIdsArray, ArrayList<String> missingEmails,
ArrayList<String> duplicateEmails, boolean noUserIdsCheck) {
Intent intent = new Intent(mContext, RemoteSelectPubKeyActivity.class);
intent.putExtra(RemoteSelectPubKeyActivity.EXTRA_SELECTED_MASTER_KEY_IDS, keyIdsArray);
intent.putExtra(RemoteSelectPubKeyActivity.EXTRA_NO_USER_IDS_CHECK, noUserIdsCheck);
intent.putExtra(RemoteSelectPubKeyActivity.EXTRA_MISSING_EMAILS, missingEmails);
intent.putExtra(RemoteSelectPubKeyActivity.EXTRA_DUPLICATE_EMAILS, duplicateEmails);
return build(intent);
}
PendingIntent importFromKeyserver(long masterKeyId) {
Intent intent = new Intent(mContext, RemoteImportKeysActivity.class);
intent.setAction(RemoteImportKeysActivity.ACTION_IMPORT_KEY_FROM_KEYSERVER_AND_RETURN_RESULT);
intent.putExtra(RemoteImportKeysActivity.EXTRA_KEY_ID, masterKeyId);
return build(intent);
}
PendingIntent selectAllowedKeys(String packageName) {
Intent intent = new Intent(mContext, SelectAllowedKeysActivity.class);
intent.setData(KeychainContract.ApiApps.buildByPackageNameUri(packageName));
return build(intent);
}
PendingIntent showKey(long masterKeyId) {
Intent intent = new Intent(mContext, ViewKeyActivity.class);
intent.setData(KeychainContract.KeyRings.buildGenericKeyRingUri(masterKeyId));
return build(intent);
}
PendingIntent selectSignKeyId(String packageName, String preferredUserId) {
Intent intent = new Intent(mContext, SelectSignKeyIdActivity.class);
intent.setData(KeychainContract.ApiApps.buildByPackageNameUri(packageName));
intent.putExtra(SelectSignKeyIdActivity.EXTRA_USER_ID, preferredUserId);
return build(intent);
}
/**
* @deprecated
*/
PendingIntent createAccount(String packageName, String accountName) {
Intent intent = new Intent(mContext, RemoteCreateAccountActivity.class);
intent.putExtra(RemoteCreateAccountActivity.EXTRA_PACKAGE_NAME, packageName);
intent.putExtra(RemoteCreateAccountActivity.EXTRA_ACC_NAME, accountName);
return build(intent);
}
PendingIntent error(String errorMessage) {
Intent intent = new Intent(mContext, RemoteErrorActivity.class);
intent.putExtra(RemoteErrorActivity.EXTRA_ERROR_MESSAGE, errorMessage);
return build(intent);
}
private PendingIntent build(Intent intent) {
// re-attach "data" for pass through. It will be used later to repeat pgp operation
intent.putExtra(RemoteSecurityTokenOperationActivity.EXTRA_DATA, mPendingIntentData);
return PendingIntent.getActivity(mContext, 0,
intent,
PendingIntent.FLAG_CANCEL_CURRENT);
}
PendingIntent register(String packageName, byte[] packageCertificate) {
Intent intent = new Intent(mContext, RemoteRegisterActivity.class);
intent.putExtra(RemoteRegisterActivity.EXTRA_PACKAGE_NAME, packageName);
intent.putExtra(RemoteRegisterActivity.EXTRA_PACKAGE_SIGNATURE, packageCertificate);
intent.putExtra(RemoteRegisterActivity.EXTRA_DATA, mPendingIntentData);
return PendingIntent.getActivity(mContext, 0,
intent,
PendingIntent.FLAG_CANCEL_CURRENT | PendingIntent.FLAG_ONE_SHOT);
}
}

44
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/ApiPermissionHelper.java
View File

@@ -18,11 +18,6 @@
package org.sufficientlysecure.keychain.remote;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import android.annotation.SuppressLint;
import android.app.PendingIntent;
import android.content.Context;
@@ -40,11 +35,13 @@ import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.provider.KeychainContract;
import org.sufficientlysecure.keychain.provider.ProviderHelper;
import org.sufficientlysecure.keychain.remote.ui.RemoteCreateAccountActivity;
import org.sufficientlysecure.keychain.remote.ui.RemoteErrorActivity;
import org.sufficientlysecure.keychain.remote.ui.RemoteRegisterActivity;
import org.sufficientlysecure.keychain.util.Log;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
/**
* Abstract service class for remote APIs that handle app registration and user input.
@@ -75,6 +72,8 @@ public class ApiPermissionHelper {
* @return null if caller is allowed, or a Bundle with a PendingIntent
*/
protected Intent isAllowed(Intent data) {
ApiPendingIntentFactory piFactory = new ApiPendingIntentFactory(mContext, data);
try {
if (isCallerAllowed()) {
return null;
@@ -96,14 +95,7 @@ public class ApiPermissionHelper {
}
Log.e(Constants.TAG, "Not allowed to use service! return PendingIntent for registration!");
Intent intent = new Intent(mContext, RemoteRegisterActivity.class);
intent.putExtra(RemoteRegisterActivity.EXTRA_PACKAGE_NAME, packageName);
intent.putExtra(RemoteRegisterActivity.EXTRA_PACKAGE_SIGNATURE, packageCertificate);
intent.putExtra(RemoteRegisterActivity.EXTRA_DATA, data);
PendingIntent pi = PendingIntent.getActivity(mContext, 0,
intent,
PendingIntent.FLAG_CANCEL_CURRENT | PendingIntent.FLAG_ONE_SHOT);
PendingIntent pi = piFactory.register(packageName, packageCertificate);
// return PendingIntent to be executed by client
Intent result = new Intent();
@@ -115,14 +107,7 @@ public class ApiPermissionHelper {
} catch (WrongPackageCertificateException e) {
Log.e(Constants.TAG, "wrong signature!", e);
Intent intent = new Intent(mContext, RemoteErrorActivity.class);
intent.putExtra(RemoteErrorActivity.EXTRA_ERROR_MESSAGE,
mContext.getString(R.string.api_error_wrong_signature));
intent.putExtra(RemoteErrorActivity.EXTRA_DATA, data);
PendingIntent pi = PendingIntent.getActivity(mContext, 0,
intent,
PendingIntent.FLAG_CANCEL_CURRENT);
PendingIntent pi = piFactory.error(mContext.getString(R.string.api_error_wrong_signature));
// return PendingIntent to be executed by client
Intent result = new Intent();
@@ -187,20 +172,15 @@ public class ApiPermissionHelper {
}
/**
* Deprecated API
* @deprecated
*/
protected Intent getCreateAccountIntent(Intent data, String accountName) {
String packageName = getCurrentCallingPackage();
Log.d(Constants.TAG, "getCreateAccountIntent accountName: " + accountName);
Intent intent = new Intent(mContext, RemoteCreateAccountActivity.class);
intent.putExtra(RemoteCreateAccountActivity.EXTRA_PACKAGE_NAME, packageName);
intent.putExtra(RemoteCreateAccountActivity.EXTRA_ACC_NAME, accountName);
intent.putExtra(RemoteCreateAccountActivity.EXTRA_DATA, data);
ApiPendingIntentFactory piFactory = new ApiPendingIntentFactory(mContext, data);
PendingIntent pi = PendingIntent.getActivity(mContext, 0,
intent,
PendingIntent.FLAG_CANCEL_CURRENT);
PendingIntent pi = piFactory.createAccount(packageName, accountName);
// return PendingIntent to be executed by client
Intent result = new Intent();

131
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/OpenPgpService.java
View File

@@ -19,7 +19,6 @@ package org.sufficientlysecure.keychain.remote;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
@@ -53,15 +52,8 @@ import org.sufficientlysecure.keychain.provider.KeychainContract.ApiAccounts;
import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRings;
import org.sufficientlysecure.keychain.provider.KeychainDatabase.Tables;
import org.sufficientlysecure.keychain.provider.ProviderHelper;
import org.sufficientlysecure.keychain.remote.ui.RemoteImportKeysActivity;
import org.sufficientlysecure.keychain.remote.ui.RemotePassphraseDialogActivity;
import org.sufficientlysecure.keychain.remote.ui.RemoteSecurityTokenOperationActivity;
import org.sufficientlysecure.keychain.remote.ui.RemoteSelectPubKeyActivity;
import org.sufficientlysecure.keychain.remote.ui.SelectAllowedKeysActivity;
import org.sufficientlysecure.keychain.remote.ui.SelectSignKeyIdActivity;
import org.sufficientlysecure.keychain.service.input.CryptoInputParcel;
import org.sufficientlysecure.keychain.service.input.RequiredInputParcel;
import org.sufficientlysecure.keychain.ui.ViewKeyActivity;
import org.sufficientlysecure.keychain.util.InputData;
import org.sufficientlysecure.keychain.util.Log;
import org.sufficientlysecure.keychain.util.Passphrase;
@@ -151,16 +143,9 @@ public class OpenPgpService extends Service {
if (noUserIdsCheck || missingUserIdsCheck || duplicateUserIdsCheck) {
// allow the user to verify pub key selection
Intent intent = new Intent(getBaseContext(), RemoteSelectPubKeyActivity.class);
intent.putExtra(RemoteSelectPubKeyActivity.EXTRA_SELECTED_MASTER_KEY_IDS, keyIdsArray);
intent.putExtra(RemoteSelectPubKeyActivity.EXTRA_NO_USER_IDS_CHECK, noUserIdsCheck);
intent.putExtra(RemoteSelectPubKeyActivity.EXTRA_MISSING_EMAILS, missingEmails);
intent.putExtra(RemoteSelectPubKeyActivity.EXTRA_DUPLICATE_EMAILS, duplicateEmails);
intent.putExtra(RemoteSelectPubKeyActivity.EXTRA_DATA, data);
PendingIntent pi = PendingIntent.getActivity(getBaseContext(), 0,
intent,
PendingIntent.FLAG_CANCEL_CURRENT);
ApiPendingIntentFactory piFactory = new ApiPendingIntentFactory(getBaseContext(), data);
PendingIntent pi = piFactory.selectPublicKey(keyIdsArray, missingEmails,
duplicateEmails, noUserIdsCheck);
// return PendingIntent to be executed by client
Intent result = new Intent();
@@ -181,76 +166,6 @@ public class OpenPgpService extends Service {
}
}
private static PendingIntent getRequiredInputPendingIntent(Context context,
Intent data,
RequiredInputParcel requiredInput,
CryptoInputParcel cryptoInput) {
switch (requiredInput.mType) {
case NFC_MOVE_KEY_TO_CARD:
case NFC_DECRYPT:
case NFC_SIGN: {
// build PendingIntent for Security Token NFC operations
Intent intent = new Intent(context, RemoteSecurityTokenOperationActivity.class);
// pass params through to activity that it can be returned again later to repeat pgp operation
intent.putExtra(RemoteSecurityTokenOperationActivity.EXTRA_DATA, data);
intent.putExtra(RemoteSecurityTokenOperationActivity.EXTRA_REQUIRED_INPUT, requiredInput);
intent.putExtra(RemoteSecurityTokenOperationActivity.EXTRA_CRYPTO_INPUT, cryptoInput);
return PendingIntent.getActivity(context, 0, intent,
PendingIntent.FLAG_CANCEL_CURRENT);
}
case PASSPHRASE: {
// build PendingIntent for Passphrase request
Intent intent = new Intent(context, RemotePassphraseDialogActivity.class);
// pass params through to activity that it can be returned again later to repeat pgp operation
intent.putExtra(RemotePassphraseDialogActivity.EXTRA_DATA, data);
intent.putExtra(RemotePassphraseDialogActivity.EXTRA_REQUIRED_INPUT, requiredInput);
intent.putExtra(RemotePassphraseDialogActivity.EXTRA_CRYPTO_INPUT, cryptoInput);
return PendingIntent.getActivity(context, 0, intent,
PendingIntent.FLAG_CANCEL_CURRENT);
}
default:
throw new AssertionError("Unhandled required input type!");
}
}
private PendingIntent getKeyserverPendingIntent(Intent data, long masterKeyId) {
// If signature is unknown we return an _additional_ PendingIntent
// to retrieve the missing key
Intent intent = new Intent(getBaseContext(), RemoteImportKeysActivity.class);
intent.setAction(RemoteImportKeysActivity.ACTION_IMPORT_KEY_FROM_KEYSERVER_AND_RETURN_RESULT);
intent.putExtra(RemoteImportKeysActivity.EXTRA_KEY_ID, masterKeyId);
intent.putExtra(RemoteImportKeysActivity.EXTRA_DATA, data);
return PendingIntent.getActivity(getBaseContext(), 0,
intent,
PendingIntent.FLAG_CANCEL_CURRENT);
}
private PendingIntent getSelectAllowedKeysIntent(Intent data) {
// If signature is unknown we return an _additional_ PendingIntent
// to retrieve the missing key
Intent intent = new Intent(getBaseContext(), SelectAllowedKeysActivity.class);
intent.putExtra(SelectAllowedKeysActivity.EXTRA_SERVICE_INTENT, data);
intent.setData(KeychainContract.ApiApps.buildByPackageNameUri(mApiPermissionHelper.getCurrentCallingPackage()));
return PendingIntent.getActivity(getBaseContext(), 0,
intent,
PendingIntent.FLAG_CANCEL_CURRENT);
}
private PendingIntent getShowKeyPendingIntent(long masterKeyId) {
Intent intent = new Intent(getBaseContext(), ViewKeyActivity.class);
intent.setData(KeyRings.buildGenericKeyRingUri(masterKeyId));
return PendingIntent.getActivity(getBaseContext(), 0,
intent,
PendingIntent.FLAG_CANCEL_CURRENT);
}
private Intent signImpl(Intent data, InputStream inputStream,
OutputStream outputStream, boolean cleartextSign) {
try {
@@ -311,10 +226,10 @@ public class OpenPgpService extends Service {
PgpSignEncryptResult pgpResult = pse.execute(pseInput, inputParcel, inputData, outputStream);
if (pgpResult.isPending()) {
ApiPendingIntentFactory piFactory = new ApiPendingIntentFactory(getBaseContext(), data);
RequiredInputParcel requiredInput = pgpResult.getRequiredInputParcel();
PendingIntent pIntent = getRequiredInputPendingIntent(getBaseContext(), data,
requiredInput, pgpResult.mCryptoInputParcel);
PendingIntent pIntent = piFactory.requiredInputPi(requiredInput, pgpResult.mCryptoInputParcel);
// return PendingIntent to be executed by client
Intent result = new Intent();
@@ -448,9 +363,10 @@ public class OpenPgpService extends Service {
PgpSignEncryptResult pgpResult = op.execute(pseInput, inputParcel, inputData, outputStream);
if (pgpResult.isPending()) {
ApiPendingIntentFactory piFactory = new ApiPendingIntentFactory(getBaseContext(), data);
RequiredInputParcel requiredInput = pgpResult.getRequiredInputParcel();
PendingIntent pIntent = getRequiredInputPendingIntent(getBaseContext(), data,
requiredInput, pgpResult.mCryptoInputParcel);
PendingIntent pIntent = piFactory.requiredInputPi(requiredInput, pgpResult.mCryptoInputParcel);
// return PendingIntent to be executed by client
Intent result = new Intent();
@@ -520,11 +436,12 @@ public class OpenPgpService extends Service {
DecryptVerifyResult pgpResult = op.execute(input, cryptoInput, inputData, outputStream);
ApiPendingIntentFactory piFactory = new ApiPendingIntentFactory(getBaseContext(), data);
if (pgpResult.isPending()) {
// prepare and return PendingIntent to be executed by client
RequiredInputParcel requiredInput = pgpResult.getRequiredInputParcel();
PendingIntent pIntent = getRequiredInputPendingIntent(getBaseContext(), data,
requiredInput, pgpResult.mCryptoInputParcel);
PendingIntent pIntent = piFactory.requiredInputPi(requiredInput, pgpResult.mCryptoInputParcel);
Intent result = new Intent();
result.putExtra(OpenPgpApi.RESULT_INTENT, pIntent);
@@ -541,7 +458,8 @@ public class OpenPgpService extends Service {
switch (signatureResult.getResult()) {
case OpenPgpSignatureResult.RESULT_KEY_MISSING: {
// If signature key is missing we return a PendingIntent to retrieve the key
result.putExtra(OpenPgpApi.RESULT_INTENT, getKeyserverPendingIntent(data, signatureResult.getKeyId()));
result.putExtra(OpenPgpApi.RESULT_INTENT,
piFactory.importFromKeyserver(signatureResult.getKeyId()));
break;
}
case OpenPgpSignatureResult.RESULT_VALID_CONFIRMED:
@@ -550,7 +468,7 @@ public class OpenPgpService extends Service {
case OpenPgpSignatureResult.RESULT_INVALID_KEY_EXPIRED:
case OpenPgpSignatureResult.RESULT_INVALID_INSECURE: {
// If signature key is known, return PendingIntent to show key
result.putExtra(OpenPgpApi.RESULT_INTENT, getShowKeyPendingIntent(signatureResult.getKeyId()));
result.putExtra(OpenPgpApi.RESULT_INTENT, piFactory.showKey(signatureResult.getKeyId()));
break;
}
default:
@@ -623,7 +541,8 @@ public class OpenPgpService extends Service {
if (pgpResult.isKeysDisallowed()) {
// allow user to select allowed keys
Intent result = new Intent();
result.putExtra(OpenPgpApi.RESULT_INTENT, getSelectAllowedKeysIntent(data));
String packageName = mApiPermissionHelper.getCurrentCallingPackage();
result.putExtra(OpenPgpApi.RESULT_INTENT, piFactory.selectAllowedKeys(packageName));
result.putExtra(OpenPgpApi.RESULT_CODE, OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED);
return result;
}
@@ -647,6 +566,8 @@ public class OpenPgpService extends Service {
private Intent getKeyImpl(Intent data, OutputStream outputStream) {
try {
ApiPendingIntentFactory piFactory = new ApiPendingIntentFactory(getBaseContext(), data);
long masterKeyId = data.getLongExtra(OpenPgpApi.EXTRA_KEY_ID, 0);
try {
@@ -676,14 +597,14 @@ public class OpenPgpService extends Service {
}
// also return PendingIntent that opens the key view activity
result.putExtra(OpenPgpApi.RESULT_INTENT, getShowKeyPendingIntent(masterKeyId));
result.putExtra(OpenPgpApi.RESULT_INTENT, piFactory.showKey(masterKeyId));
return result;
} catch (ProviderHelper.NotFoundException e) {
// If keys are not in db we return an additional PendingIntent
// to retrieve the missing key
Intent result = new Intent();
result.putExtra(OpenPgpApi.RESULT_INTENT, getKeyserverPendingIntent(data, masterKeyId));
result.putExtra(OpenPgpApi.RESULT_INTENT, piFactory.importFromKeyserver(masterKeyId));
result.putExtra(OpenPgpApi.RESULT_CODE, OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED);
return result;
}
@@ -709,17 +630,11 @@ public class OpenPgpService extends Service {
result.putExtra(OpenPgpApi.RESULT_CODE, OpenPgpApi.RESULT_CODE_SUCCESS);
return result;
} else {
String currentPkg = mApiPermissionHelper.getCurrentCallingPackage();
String preferredUserId = data.getStringExtra(OpenPgpApi.EXTRA_USER_ID);
Intent intent = new Intent(getBaseContext(), SelectSignKeyIdActivity.class);
String currentPkg = mApiPermissionHelper.getCurrentCallingPackage();
intent.setData(KeychainContract.ApiApps.buildByPackageNameUri(currentPkg));
intent.putExtra(SelectSignKeyIdActivity.EXTRA_USER_ID, preferredUserId);
intent.putExtra(SelectSignKeyIdActivity.EXTRA_DATA, data);
PendingIntent pi = PendingIntent.getActivity(getBaseContext(), 0,
intent,
PendingIntent.FLAG_CANCEL_CURRENT);
ApiPendingIntentFactory piFactory = new ApiPendingIntentFactory(getBaseContext(), data);
PendingIntent pi = piFactory.selectSignKeyId(currentPkg, preferredUserId);
// return PendingIntent to be executed by client
Intent result = new Intent();