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/**
* Copyright (c) 2020 LEAP Encryption Access Project and contributers
*
* 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 se.leap.bitmaskclient.appUpdate;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.ResultReceiver;
import android.util.Log;
import java.io.File;
import okhttp3.OkHttpClient;
import pgpverify.Logger;
import pgpverify.PgpVerifier;
import se.leap.bitmaskclient.BuildConfig;
import se.leap.bitmaskclient.OkHttpClientGenerator;
import se.leap.bitmaskclient.R;
import static android.text.TextUtils.isEmpty;
import static se.leap.bitmaskclient.Constants.BROADCAST_DOWNLOAD_SERVICE_EVENT;
import static se.leap.bitmaskclient.Constants.BROADCAST_RESULT_CODE;
import static se.leap.bitmaskclient.Constants.BROADCAST_RESULT_KEY;
import static se.leap.bitmaskclient.ProviderAPI.RECEIVER_KEY;
import static se.leap.bitmaskclient.appUpdate.DownloadService.DOWNLOAD_FAILED;
import static se.leap.bitmaskclient.appUpdate.DownloadService.DOWNLOAD_PROGRESS;
import static se.leap.bitmaskclient.appUpdate.DownloadService.NO_NEW_VERISON;
import static se.leap.bitmaskclient.appUpdate.DownloadService.NO_PUB_KEY;
import static se.leap.bitmaskclient.appUpdate.DownloadService.PROGRESS_VALUE;
import static se.leap.bitmaskclient.appUpdate.DownloadService.UPDATE_DOWNLOADED;
import static se.leap.bitmaskclient.appUpdate.DownloadService.UPDATE_DOWNLOAD_FAILED;
import static se.leap.bitmaskclient.appUpdate.DownloadService.UPDATE_FOUND;
import static se.leap.bitmaskclient.appUpdate.DownloadService.UPDATE_NOT_FOUND;
import static se.leap.bitmaskclient.appUpdate.DownloadService.VERIFICATION_ERROR;
import static se.leap.bitmaskclient.appUpdate.DownloadServiceCommand.CHECK_VERSION_FILE;
import static se.leap.bitmaskclient.appUpdate.DownloadServiceCommand.DOWNLOAD_UPDATE;
import static se.leap.bitmaskclient.base.utils.FileHelper.readPublicKey;
public class UpdateDownloadManager implements Logger, DownloadConnector.DownloadProgress {
private static final String TAG = UpdateDownloadManager.class.getSimpleName();
public interface DownloadServiceCallback {
void broadcastEvent(Intent intent);
}
private Context context;
private PgpVerifier pgpVerifier;
private DownloadServiceCallback serviceCallback;
OkHttpClientGenerator clientGenerator;
public UpdateDownloadManager(Context context, OkHttpClientGenerator clientGenerator, DownloadServiceCallback callback) {
this.context = context;
this.clientGenerator = clientGenerator;
pgpVerifier = new PgpVerifier();
pgpVerifier.setLogger(this);
serviceCallback = callback;
}
//pgpverify Logger interface
@Override
public void log(String s) {
}
@Override
public void onUpdate(int progress) {
Bundle resultData = new Bundle();
resultData.putInt(PROGRESS_VALUE, progress);
broadcastEvent(DOWNLOAD_PROGRESS, resultData);
}
public void handleIntent(Intent command) {
ResultReceiver receiver = null;
if (command.getParcelableExtra(RECEIVER_KEY) != null) {
receiver = command.getParcelableExtra(RECEIVER_KEY);
}
String action = command.getAction();
Bundle result = new Bundle();
switch (action) {
case CHECK_VERSION_FILE:
result = checkVersionFile(result);
if (result.getBoolean(BROADCAST_RESULT_KEY)) {
sendToReceiverOrBroadcast(receiver, UPDATE_FOUND, result);
} else {
sendToReceiverOrBroadcast(receiver, UPDATE_NOT_FOUND, result);
}
break;
case DOWNLOAD_UPDATE:
result = downloadUpdate(result);
if (result.getBoolean(BROADCAST_RESULT_KEY)) {
sendToReceiverOrBroadcast(receiver, UPDATE_DOWNLOADED, result);
} else {
sendToReceiverOrBroadcast(receiver, UPDATE_DOWNLOAD_FAILED, result);
}
break;
}
}
public static File getUpdateFile(Context context) {
return new File(context.getExternalFilesDir(null) + "/" + context.getString(R.string.app_name) + "_update.apk");
}
private Bundle downloadUpdate(Bundle task) {
String publicKey = readPublicKey(context);
if (isEmpty(publicKey)) {
task.putBoolean(BROADCAST_RESULT_KEY, false);
task.putBoolean(NO_PUB_KEY, true);
return task;
}
OkHttpClient client = clientGenerator.init();
String signature = DownloadConnector.requestTextFileFromServer(BuildConfig.signature_url, client);
if (signature == null) {
task.putBoolean(BROADCAST_RESULT_KEY, false);
task.putBoolean(DOWNLOAD_FAILED, true);
return task;
}
File destinationFile = getUpdateFile(context);
if (destinationFile.exists()) {
destinationFile.delete();
}
destinationFile = DownloadConnector.requestFileFromServer(BuildConfig.update_apk_url, client, destinationFile, this);
if (destinationFile == null) {
task.putBoolean(BROADCAST_RESULT_KEY, false);
task.putBoolean(DOWNLOAD_FAILED, true);
return task;
}
boolean successfulVerified = pgpVerifier.verify(signature, publicKey, destinationFile.getAbsolutePath());
if (!successfulVerified) {
destinationFile.delete();
task.putBoolean(BROADCAST_RESULT_KEY, false);
task.putBoolean(VERIFICATION_ERROR, true);
return task;
}
task.putBoolean(BROADCAST_RESULT_KEY, true);
return task;
}
private Bundle checkVersionFile(Bundle task) {
OkHttpClient client = clientGenerator.init();
String versionString = DownloadConnector.requestTextFileFromServer(BuildConfig.version_file_url, client);
if (versionString != null) {
versionString = versionString.replace("\n", "").trim();
}
int version = -1;
try {
version = Integer.parseInt(versionString);
} catch (NumberFormatException e) {
e.printStackTrace();
Log.e(TAG, "could not parse version code: " + versionString);
}
if (version == -1) {
task.putBoolean(BROADCAST_RESULT_KEY, false);
task.putBoolean(DOWNLOAD_FAILED, true);
} else if (BuildConfig.VERSION_CODE >= version) {
task.putBoolean(BROADCAST_RESULT_KEY, false);
task.putBoolean(NO_NEW_VERISON, true);
} else {
task.putBoolean(BROADCAST_RESULT_KEY, true);
}
return task;
}
private void sendToReceiverOrBroadcast(ResultReceiver receiver, int resultCode, Bundle resultData) {
if (resultData == null || resultData == Bundle.EMPTY) {
resultData = new Bundle();
}
if (receiver != null) {
receiver.send(resultCode, resultData);
} else {
broadcastEvent(resultCode, resultData);
}
}
private void broadcastEvent(int resultCode , Bundle resultData) {
Intent intentUpdate = new Intent(BROADCAST_DOWNLOAD_SERVICE_EVENT);
intentUpdate.addCategory(Intent.CATEGORY_DEFAULT);
intentUpdate.putExtra(BROADCAST_RESULT_CODE, resultCode);
intentUpdate.putExtra(BROADCAST_RESULT_KEY, resultData);
serviceCallback.broadcastEvent(intentUpdate);
}
}
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