add ServiceExceptionHandler into utils package

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/*

 * Copyright © Vincent Bourgmayer (/e/ foundation).

 * All rights reserved. This program and the accompanying materials

 * are made available under the terms of the GNU Public License v3.0

 * which accompanies this distribution, and is available at

 * http://www.gnu.org/licenses/gpl.html

 */

package foundation.e.drive.utils;

import android.app.Service;

import android.os.Environment;

import android.util.Log;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.PrintWriter;

import java.io.StringWriter;

import java.lang.Thread.UncaughtExceptionHandler;

/**

 * @author Vincent Bourgmayer

 */

public class ServiceExceptionHandler implements UncaughtExceptionHandler{

    private UncaughtExceptionHandler defaultUEH;

    Service service;

    public ServiceExceptionHandler(Service service) {

        this.service = service;

        defaultUEH = Thread.getDefaultUncaughtExceptionHandler();

    }

    @Override

    public void uncaughtException(Thread t, Throwable e) {

        if(isExternalStorageAvailable() && !isExternalStorageReadOnly()){

            //Get TimeStamp

            Long timestamp = System.currentTimeMillis();

            //Create a new file that user can sent to us

            String fileName = "eDrive-crash-"+timestamp+".log";

            File downloadDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getPath());

            File logFile = new File(downloadDir, fileName);

            try {

                FileOutputStream fos = new FileOutputStream(logFile);

                fos.write(getStackTraceAsString(e).getBytes());

                fos.close();

            } catch (IOException exception) {

                exception.printStackTrace();

            }

        }

        //source: https://stackoverflow.com/questions/9050962/rethrow-uncaughtexceptionhandler-exception-after-logging-it/9050990#9050990

        if(defaultUEH != null){

            defaultUEH.uncaughtException(t, e);

        }else{

            Log.d("ServiceExceptionHandler", "/e/ Drive has crashed and there is no ExceptionHandler");

            System.exit(1); //Kill /e/ Drive...

        }

    }

    //source: https://www.journaldev.com/9400/android-external-storage-read-write-save-file

    private static boolean isExternalStorageAvailable() {

        String extStorageState = Environment.getExternalStorageState();

        if (Environment.MEDIA_MOUNTED.equals(extStorageState)) {

            return true;

        }

        return false;

    }

    //source: https://www.journaldev.com/9400/android-external-storage-read-write-save-file

    private static boolean isExternalStorageReadOnly() {

        String extStorageState = Environment.getExternalStorageState();

        if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(extStorageState)) {

            return true;

        }

        return false;

    }

    /**

     * Return the stackTrace of the exception as a String

     * @param e the exception

     * @return the Stacktrace as a string

     */

    private String getStackTraceAsString(Throwable e){

        StringWriter sw = new StringWriter();

        PrintWriter pw = new PrintWriter(sw);

        e.printStackTrace(pw);

        return sw.toString();

    }

}

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