Merge branch '000-refactor-remove-serviceExceptionHandler' into 'main'

# eDrive

eDrive is a [persistent][doc-persistence] application provided by default with /e/OS.

eDrive is an application provided by default with /e/OS.

It synchronizes user's data files to /e/Cloud or a self-hosted cloud.

## Install

/*

 * Copyright © CLEUS SAS 2018-2019.

 * Copyright © ECORP SAS 2022.

 * 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.annotation.SuppressLint;

import android.app.Service;

import android.os.Environment;

import androidx.annotation.NonNull;

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;

/**

 * todo: check if still usefull or if it can be remove

 * @author Vincent Bourgmayer

 */

public class ServiceExceptionHandler implements UncaughtExceptionHandler {

    public final static String CRASH_LOG_FOLDER = "crash-logs";

    public final static String LOG_FILE_NAME_PREFIX = "eDrive-crash-";

    public final static String LOG_FILE_EXTENSION = ".log";

    private final UncaughtExceptionHandler defaultUEH;

    Service service;

    /**

     * Update the service which use this handler

     * @param service current running service

     */

    public void setService(@NonNull Service service) {

        this.service = service;

    }

    public ServiceExceptionHandler(@NonNull Service service) {

        this.service = service;

        defaultUEH = Thread.getDefaultUncaughtExceptionHandler();

    }

    @SuppressLint("SetWorldReadable")

    @Override

    public void uncaughtException(@NonNull Thread t, @NonNull Throwable exception) {

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

            final long timestamp = System.currentTimeMillis();

            final String fileName = LOG_FILE_NAME_PREFIX+timestamp+LOG_FILE_EXTENSION;

            final File downloadDir = service.getApplication().getExternalFilesDir(CRASH_LOG_FOLDER);

            final File logFile = new File(downloadDir, fileName);

            try (FileOutputStream fos = new FileOutputStream(logFile)) {

                fos.write(service.getClass().getSimpleName().getBytes());

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

                logFile.setReadable(true, false);

            } catch (IOException ioException) {

                ioException.printStackTrace();

            }

        }

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

        if (defaultUEH != null) {

            defaultUEH.uncaughtException(t, exception);

        } else {

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

        }

    }

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

    private static boolean isExternalStorageAvailable() {

        final String extStorageState = Environment.getExternalStorageState();

        return Environment.MEDIA_MOUNTED.equals(extStorageState);

    }

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

    private static boolean isExternalStorageReadOnly() {

        final String extStorageState = Environment.getExternalStorageState();

        return Environment.MEDIA_MOUNTED_READ_ONLY.equals(extStorageState);

    }

    /**

     * Return the stackTrace of the exception as a String

     * @param exception the exception

     * @return the Stacktrace as a string

     */

    @NonNull

    private String getStackTraceAsString(Throwable exception) {

        final StringWriter sw = new StringWriter();

        final PrintWriter pw = new PrintWriter(sw);

        exception.printStackTrace(pw);

        return sw.toString();

    }

}

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