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/*
* Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
*
* 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 org.openintents.openpgp.util;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.ParcelFileDescriptor;
import android.util.Log;
import org.openintents.openpgp.IOpenPgpService;
import org.openintents.openpgp.OpenPgpError;
import java.io.InputStream;
import java.io.OutputStream;
public class OpenPgpApi {
IOpenPgpService mService;
Context mContext;
private static final int OPERATION_SIGN = 0;
private static final int OPERATION_ENCRYPT = 1;
private static final int OPERATION_SIGN_ENCRYPT = 2;
private static final int OPERATION_DECRYPT_VERIFY = 3;
private static final int OPERATION_GET_KEY_IDS = 4;
public OpenPgpApi(Context context, IOpenPgpService service) {
this.mContext = context;
this.mService = service;
}
public Bundle sign(InputStream is, final OutputStream os) {
return executeApi(OPERATION_SIGN, new Bundle(), is, os);
}
public Bundle sign(Bundle params, InputStream is, final OutputStream os) {
return executeApi(OPERATION_SIGN, params, is, os);
}
public void sign(Bundle params, InputStream is, final OutputStream os, IOpenPgpCallback callback) {
executeApiAsync(OPERATION_SIGN, params, is, os, callback);
}
public Bundle encrypt(InputStream is, final OutputStream os) {
return executeApi(OPERATION_ENCRYPT, new Bundle(), is, os);
}
public Bundle encrypt(Bundle params, InputStream is, final OutputStream os) {
return executeApi(OPERATION_ENCRYPT, params, is, os);
}
public void encrypt(Bundle params, InputStream is, final OutputStream os, IOpenPgpCallback callback) {
executeApiAsync(OPERATION_ENCRYPT, params, is, os, callback);
}
public Bundle signAndEncrypt(InputStream is, final OutputStream os) {
return executeApi(OPERATION_SIGN_ENCRYPT, new Bundle(), is, os);
}
public Bundle signAndEncrypt(Bundle params, InputStream is, final OutputStream os) {
return executeApi(OPERATION_SIGN_ENCRYPT, params, is, os);
}
public void signAndEncrypt(Bundle params, InputStream is, final OutputStream os, IOpenPgpCallback callback) {
executeApiAsync(OPERATION_SIGN_ENCRYPT, params, is, os, callback);
}
public Bundle decryptAndVerify(InputStream is, final OutputStream os) {
return executeApi(OPERATION_DECRYPT_VERIFY, new Bundle(), is, os);
}
public Bundle decryptAndVerify(Bundle params, InputStream is, final OutputStream os) {
return executeApi(OPERATION_DECRYPT_VERIFY, params, is, os);
}
public void decryptAndVerify(Bundle params, InputStream is, final OutputStream os, IOpenPgpCallback callback) {
executeApiAsync(OPERATION_DECRYPT_VERIFY, params, is, os, callback);
}
public Bundle getKeyIds(Bundle params) {
return executeApi(OPERATION_GET_KEY_IDS, params, null, null);
}
public interface IOpenPgpCallback {
void onReturn(final Bundle result);
}
private class OpenPgpAsyncTask extends AsyncTask<Void, Integer, Bundle> {
int operationId;
Bundle params;
InputStream is;
OutputStream os;
IOpenPgpCallback callback;
private OpenPgpAsyncTask(int operationId, Bundle params, InputStream is, OutputStream os, IOpenPgpCallback callback) {
this.operationId = operationId;
this.params = params;
this.is = is;
this.os = os;
this.callback = callback;
}
@Override
protected Bundle doInBackground(Void... unused) {
return executeApi(operationId, params, is, os);
}
protected void onPostExecute(Bundle result) {
callback.onReturn(result);
}
}
private void executeApiAsync(int operationId, Bundle params, InputStream is, OutputStream os, IOpenPgpCallback callback) {
new OpenPgpAsyncTask(operationId, params, is, os, callback).execute((Void[]) null);
}
private Bundle executeApi(int operationId, Bundle params, InputStream is, OutputStream os) {
try {
params.putInt(OpenPgpConstants.PARAMS_API_VERSION, OpenPgpConstants.API_VERSION);
Bundle result = null;
if (operationId == OPERATION_GET_KEY_IDS) {
result = mService.getKeyIds(params);
return result;
} else {
// send the input and output pfds
ParcelFileDescriptor input = ParcelFileDescriptorUtil.pipeFrom(is,
new ParcelFileDescriptorUtil.IThreadListener() {
@Override
public void onThreadFinished(Thread thread) {
Log.d(OpenPgpConstants.TAG, "Copy to service finished");
}
});
ParcelFileDescriptor output = ParcelFileDescriptorUtil.pipeTo(os,
new ParcelFileDescriptorUtil.IThreadListener() {
@Override
public void onThreadFinished(Thread thread) {
Log.d(OpenPgpConstants.TAG, "Service finished writing!");
}
});
// blocks until result is ready
switch (operationId) {
case OPERATION_SIGN:
result = mService.sign(params, input, output);
break;
case OPERATION_ENCRYPT:
result = mService.encrypt(params, input, output);
break;
case OPERATION_SIGN_ENCRYPT:
result = mService.signAndEncrypt(params, input, output);
break;
case OPERATION_DECRYPT_VERIFY:
result = mService.decryptAndVerify(params, input, output);
break;
}
// close() is required to halt the TransferThread
output.close();
// set class loader to current context to allow unparcelling
// of OpenPgpError and OpenPgpSignatureResult
// http://stackoverflow.com/a/3806769
result.setClassLoader(mContext.getClassLoader());
return result;
}
} catch (Exception e) {
Log.e(OpenPgpConstants.TAG, "Exception", e);
Bundle result = new Bundle();
result.putInt(OpenPgpConstants.RESULT_CODE, OpenPgpConstants.RESULT_CODE_ERROR);
result.putParcelable(OpenPgpConstants.RESULT_ERRORS,
new OpenPgpError(OpenPgpError.CLIENT_SIDE_ERROR, e.getMessage()));
return result;
}
}
}
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