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/*
* Copyright (C) 2014-2015 Vincent Breitmoser <v.breitmoser@mugenguild.com>
*
* 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.operations;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.concurrent.atomic.AtomicBoolean;
import android.content.Context;
import android.net.Uri;
import android.support.annotation.NonNull;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.operations.results.OperationResult.LogType;
import org.sufficientlysecure.keychain.operations.results.OperationResult.OperationLog;
import org.sufficientlysecure.keychain.operations.results.PgpSignEncryptResult;
import org.sufficientlysecure.keychain.operations.results.SignEncryptResult;
import org.sufficientlysecure.keychain.pgp.PgpSignEncryptOperation;
import org.sufficientlysecure.keychain.pgp.Progressable;
import org.sufficientlysecure.keychain.pgp.SignEncryptParcel;
import org.sufficientlysecure.keychain.pgp.exception.PgpKeyNotFoundException;
import org.sufficientlysecure.keychain.provider.ProviderHelper;
import org.sufficientlysecure.keychain.service.input.CryptoInputParcel;
import org.sufficientlysecure.keychain.service.input.RequiredInputParcel;
import org.sufficientlysecure.keychain.service.input.RequiredInputParcel.SecurityTokenSignOperationsBuilder;
import org.sufficientlysecure.keychain.service.input.RequiredInputParcel.RequiredInputType;
import org.sufficientlysecure.keychain.util.FileHelper;
import org.sufficientlysecure.keychain.util.InputData;
import org.sufficientlysecure.keychain.util.Log;
import org.sufficientlysecure.keychain.util.ProgressScaler;
/**
* This is a high-level operation, which encapsulates one or more sign/encrypt
* operations, using URIs or byte arrays as input and output.
*
* This operation is fail-fast: If any sign/encrypt sub-operation fails or returns
* a pending result, it will terminate.
*/
public class SignEncryptOperation extends BaseOperation<SignEncryptParcel> {
public SignEncryptOperation(Context context, ProviderHelper providerHelper,
Progressable progressable, AtomicBoolean cancelled) {
super(context, providerHelper, progressable, cancelled);
}
@NonNull
public SignEncryptResult execute(SignEncryptParcel input, CryptoInputParcel cryptoInput) {
OperationLog log = new OperationLog();
log.add(LogType.MSG_SE, 0);
ArrayDeque<Uri> inputUris = new ArrayDeque<>(input.getInputUris());
ArrayDeque<Uri> outputUris = new ArrayDeque<>(input.getOutputUris());
byte[] inputBytes = input.getBytes();
byte[] outputBytes = null;
int total = inputBytes != null ? 1 : inputUris.size(), count = 0;
ArrayList<PgpSignEncryptResult> results = new ArrayList<>();
SecurityTokenSignOperationsBuilder pendingInputBuilder = null;
// if signing subkey has not explicitly been set, get first usable subkey capable of signing
if (input.getSignatureMasterKeyId() != Constants.key.none
&& input.getSignatureSubKeyId() == null) {
try {
long signKeyId = mProviderHelper.getCachedPublicKeyRing(
input.getSignatureMasterKeyId()).getSecretSignId();
input.setSignatureSubKeyId(signKeyId);
} catch (PgpKeyNotFoundException e) {
Log.e(Constants.TAG, "Key not found", e);
return new SignEncryptResult(SignEncryptResult.RESULT_ERROR, log, results);
}
}
do {
if (checkCancelled()) {
log.add(LogType.MSG_OPERATION_CANCELLED, 0);
return new SignEncryptResult(SignEncryptResult.RESULT_CANCELLED, log, results);
}
InputData inputData;
{
if (inputBytes != null) {
log.add(LogType.MSG_SE_INPUT_BYTES, 1);
InputStream is = new ByteArrayInputStream(inputBytes);
inputData = new InputData(is, inputBytes.length);
inputBytes = null;
} else {
if (inputUris.isEmpty()) {
log.add(LogType.MSG_SE_ERROR_NO_INPUT, 1);
return new SignEncryptResult(SignEncryptResult.RESULT_ERROR, log, results);
}
log.add(LogType.MSG_SE_INPUT_URI, 1);
Uri uri = inputUris.removeFirst();
try {
InputStream is = FileHelper.openInputStreamSafe(mContext.getContentResolver(), uri);
long fileSize = FileHelper.getFileSize(mContext, uri, 0);
String filename = FileHelper.getFilename(mContext, uri);
inputData = new InputData(is, fileSize, filename);
} catch (FileNotFoundException e) {
log.add(LogType.MSG_SE_ERROR_INPUT_URI_NOT_FOUND, 1);
return new SignEncryptResult(SignEncryptResult.RESULT_ERROR, log, results);
}
}
}
OutputStream outStream;
{
if (!outputUris.isEmpty()) {
try {
Uri outputUri = outputUris.removeFirst();
outStream = mContext.getContentResolver().openOutputStream(outputUri);
} catch (FileNotFoundException e) {
log.add(LogType.MSG_SE_ERROR_OUTPUT_URI_NOT_FOUND, 1);
return new SignEncryptResult(SignEncryptResult.RESULT_ERROR, log, results);
}
} else {
if (outputBytes != null) {
log.add(LogType.MSG_SE_ERROR_TOO_MANY_INPUTS, 1);
return new SignEncryptResult(SignEncryptResult.RESULT_ERROR, log, results);
}
outStream = new ByteArrayOutputStream();
}
}
PgpSignEncryptOperation op = new PgpSignEncryptOperation(mContext, mProviderHelper,
new ProgressScaler(mProgressable, 100 * count / total, 100 * ++count / total, 100), mCancelled);
PgpSignEncryptResult result = op.execute(input, cryptoInput, inputData, outStream);
results.add(result);
log.add(result, 2);
if (result.isPending()) {
RequiredInputParcel requiredInput = result.getRequiredInputParcel();
// Passphrase returns immediately, nfc are aggregated
if (requiredInput.mType == RequiredInputType.PASSPHRASE) {
return new SignEncryptResult(log, requiredInput, results, cryptoInput);
}
if (pendingInputBuilder == null) {
pendingInputBuilder = new SecurityTokenSignOperationsBuilder(requiredInput.mSignatureTime,
input.getSignatureMasterKeyId(), input.getSignatureSubKeyId());
}
pendingInputBuilder.addAll(requiredInput);
} else if (!result.success()) {
return new SignEncryptResult(SignEncryptResult.RESULT_ERROR, log, results);
}
if (outStream instanceof ByteArrayOutputStream) {
outputBytes = ((ByteArrayOutputStream) outStream).toByteArray();
}
} while (!inputUris.isEmpty());
if (pendingInputBuilder != null && !pendingInputBuilder.isEmpty()) {
return new SignEncryptResult(log, pendingInputBuilder.build(), results, cryptoInput);
}
if (!outputUris.isEmpty()) {
throw new AssertionError("Got outputs left but no inputs. This is a programming error, please report!");
}
log.add(LogType.MSG_SE_SUCCESS, 1);
return new SignEncryptResult(SignEncryptResult.RESULT_OK, log, results, outputBytes);
}
}
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