Magisk/app/src/main/java/com/topjohnwu/magisk/LogFragment.java

package com.topjohnwu.magisk;

import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Fragment;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.design.widget.Snackbar;
import android.support.v4.app.ActivityCompat;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import android.widget.ProgressBar;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;

import com.topjohnwu.magisk.utils.Utils;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Calendar;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;

public class LogFragment extends Fragment {

    private static final String MAGISK_LOG = "/cache/magisk.log";

    @BindView(R.id.txtLog) TextView txtLog;
    @BindView(R.id.svLog) ScrollView svLog;
    @BindView(R.id.hsvLog) HorizontalScrollView hsvLog;

    @BindView(R.id.progressBar) ProgressBar progressBar;

    private MenuItem mClickedMenuItem;

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        setHasOptionsMenu(true);
    }

    @Override
    public void onResume() {
        super.onResume();
        getActivity().setTitle("Log");
        setHasOptionsMenu(true);
        reloadErrorLog();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.log_fragment, container, false);
        ButterKnife.bind(this, view);

        txtLog.setTextIsSelectable(true);

        reloadErrorLog();

        setHasOptionsMenu(true);
        return view;
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.menu_log, menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        mClickedMenuItem = item;
        switch (item.getItemId()) {
            case R.id.menu_refresh:
                reloadErrorLog();
                return true;
            case R.id.menu_send:
                send();
                return true;
            case R.id.menu_save:
                save();
                return true;
            case R.id.menu_clear:
                clear();
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private void reloadErrorLog() {
        new LogsManager(true).executeOnExecutor(AsyncTask.SERIAL_EXECUTOR);
        svLog.post(() -> svLog.scrollTo(0, txtLog.getHeight()));
        hsvLog.post(() -> hsvLog.scrollTo(0, 0));
    }

    private void clear() {
        new LogsManager(false).executeOnExecutor(AsyncTask.SERIAL_EXECUTOR);
        reloadErrorLog();
    }

    private void send() {
        new SaveLog() {
            @Override
            protected void onPostExecute(Boolean bool) {
                super.onPostExecute(bool);
                if (bool) {
                    Intent sendIntent = new Intent();
                    sendIntent.setAction(Intent.ACTION_SEND);
                    sendIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(targetFile));
                    sendIntent.setType("application/html");
                    startActivity(Intent.createChooser(sendIntent, getResources().getString(R.string.menuSend)));
                } else {
                    Toast.makeText(getActivity(), getString(R.string.logs_save_failed), Toast.LENGTH_LONG).show();
                }

            }
        }.executeOnExecutor(AsyncTask.SERIAL_EXECUTOR);

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == 0) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                if (mClickedMenuItem != null) {
                    new Handler().postDelayed(() -> onOptionsItemSelected(mClickedMenuItem), 500);
                }
            } else {
                Snackbar.make(txtLog, R.string.permissionNotGranted, Snackbar.LENGTH_LONG).show();
            }
        }
    }

    private void save() {
        new SaveLog(){
            @Override
            protected void onPostExecute(Boolean bool) {
                super.onPostExecute(bool);
                if (bool) {
                    Toast.makeText(getActivity(), targetFile.toString(), Toast.LENGTH_LONG).show();
                } else {
                    Toast.makeText(getActivity(), getString(R.string.logs_save_failed), Toast.LENGTH_LONG).show();
                }
            }
        }.executeOnExecutor(AsyncTask.SERIAL_EXECUTOR);
    }

    private class SaveLog extends AsyncTask<Void, Void, Boolean> {

        File targetFile;

        @SuppressLint("DefaultLocale")
        @Override
        protected Boolean doInBackground(Void... voids) {
            if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                    requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 0);
                }
                return false;
            }

            if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                return false;
            }

            Calendar now = Calendar.getInstance();
            String filename = String.format(
                    "magisk_%s_%04d%02d%02d_%02d%02d%02d.log", "error",
                    now.get(Calendar.YEAR), now.get(Calendar.MONTH) + 1,
                    now.get(Calendar.DAY_OF_MONTH), now.get(Calendar.HOUR_OF_DAY),
                    now.get(Calendar.MINUTE), now.get(Calendar.SECOND));

             targetFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/MagiskManager/" + filename);

            if ((!targetFile.getParentFile().exists() && !targetFile.getParentFile().mkdirs()) || (targetFile.exists() && !targetFile.delete())) {
                return false;
            }

            List<String> in = Utils.readFile(MAGISK_LOG);

            try {
                FileWriter out = new FileWriter(targetFile);
                for (String line : in) {
                    out.write(line + "\n");
                }
                out.close();


                return true;
            } catch (IOException e) {
                e.printStackTrace();
                return false;
            }
        }
    }

    private class LogsManager extends AsyncTask<Void, Integer, String> {

        private boolean readLog;

        public LogsManager(boolean read) {
            readLog = read;
        }

        @Override
        protected void onPreExecute() {
            txtLog.setText("");
        }

        @Override
        protected String doInBackground(Void... voids) {
            if (readLog) {
                List<String> logList = Utils.readFile(MAGISK_LOG);

                StringBuilder llog = new StringBuilder(15 * 10 * 1024);
                for (String s : logList) {
                    llog.append(s).append("\n");
                }

                return llog.toString();
            } else {
                if (Utils.removeFile(MAGISK_LOG)) {
                    Snackbar.make(txtLog, R.string.logs_cleared, Snackbar.LENGTH_SHORT).show();
                } else {
                    Snackbar.make(txtLog, R.string.logs_clear_failed, Snackbar.LENGTH_SHORT).show();
                }
                return "";
            }
        }

        @Override
        protected void onPostExecute(String llog) {
            progressBar.setVisibility(View.GONE);
            txtLog.setText(llog);

            if (llog.length() == 0)
                txtLog.setText(R.string.log_is_empty);
        }

    }

}