Hypatia/app/src/main/java/us/spotco/malwarescanner/MalwareScannerService.java

package us.spotco.malwarescanner;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.Environment;
import android.os.FileObserver;
import android.os.IBinder;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
import android.widget.Toast;

import java.io.File;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Set;

public class MalwareScannerService extends Service {

    private ArrayList<MalwareMonitor> malwareMonitors = null;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        if (true) {//Check if we're enabled
            malwareMonitors = new ArrayList<>();
            malwareMonitors.add(new MalwareMonitor(Environment.getExternalStorageDirectory().toString()));
            malwareMonitors.add(new MalwareMonitor(Environment.getExternalStorageDirectory() + "/Documents"));
            malwareMonitors.add(new MalwareMonitor(Environment.getExternalStorageDirectory() + "/Download"));

            for (MalwareMonitor malwareMonitor : malwareMonitors) {
                malwareMonitor.startWatching();
            }
            Toast.makeText(this, "Theia: Realtime Scanning Started", Toast.LENGTH_SHORT).show();
            setForeground();
        } else {
            stopSelf();
        }

        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        for (MalwareMonitor malwareMonitor : malwareMonitors) {
            malwareMonitor.stopWatching();
        }
        Toast.makeText(this, "Theia: Realtime Scanning Stopped", Toast.LENGTH_SHORT).show();
    }

    private void setForeground() {
        NotificationManager notificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);

        Notification notification =
                new NotificationCompat.Builder(this)
                        .setSmallIcon(R.drawable.ic_notification)
                        .setContentTitle(getText(R.string.lblNotificationRealtimeTitle))
                        .setContentText(getText(R.string.lblNotificationRealtimeText))
                        .setPriority(Notification.PRIORITY_MIN)
                        .setShowWhen(false)
                        .build();

        startForeground(-1, notification);
    }

    private class MalwareMonitor extends FileObserver {

        private String rootPath = null;

        public MalwareMonitor(String path) {
            super(path);
            rootPath = path;
            if (!rootPath.endsWith("/")) {
                rootPath += "/";
            }
        }

        @Override
        public void onEvent(int eventID, String path) {
            if (eventID == FileObserver.CLOSE_WRITE) {
                File file = new File(rootPath + path);
                if (file.exists() && file.length() > 0) {
                    Set<File> filesToScan = new HashSet<>();
                    filesToScan.add(file);
                    new MalwareScanner(null, getApplicationContext(), false).execute(filesToScan);
                }
            }
        }
    }

}