searchanddisplace-core/app/SearchDisplace/Convertor/Convertor.php

<?php

namespace App\SearchDisplace\Convertor;

use Symfony\Component\Process\Process;
use Symfony\Component\Process\Exception\ProcessFailedException;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Storage;

/**
 * Convert documents from formats supported by Libre Office
 */

class Convertor {
    /**
     * @param $to desired file format
     * @param $document absolute file path
     * @param $tmp - if true file will be saved to tmp directory for download
     *
     * @return string $path to converted file
     */
    public static function convert($to, $document, $tmp = false)
    {
        $path = pathinfo($document);
        $extension = $path['extension'];
        $dir = $path['dirname'];
        $original = $dir . '/' . $path['basename'];
        if(!$tmp) {
            $folder = $dir . '/';
        } else {
            $folder = storage_path('app/tmp/');
        }

        $env = [
            'HOME' => storage_path('app/' . env('LIBREOFFICE_CONFIG_PATH', 'tmp/libreoffice')),
        ];

        if ($extension == 'odt') {
            $to = $to . ':"${:FILTER}"';
            $env['FILTER'] = 'OpenDocument Text Flat XML';
        }

        Log::info('Running `soffice` to convert "' . $original . '" to "' . $to . '". Output folder: "' . $folder . '"');
        Log::info(
            'COMMAND: ' .
            'soffice ' .
            '--headless ' .
            '--safe-mode ' .
            '--convert-to ' .
            $to . ' ' .
            $original . ' ' .
            '--outdir ' .
            $folder
        );

        # We will run the process from a shell command line, which allows us to add parameters
        # The "OpenDocument Text Flat XML" parameter contains whitespaces, so we will need to add that as
        #   a env variable parameter, otherwise the Process class will escape it and it will not work properly.
        $process = Process::fromShellCommandline(
            "soffice --quickstart=no --headless --safe-mode --convert-to $to $original --outdir $folder",
            null,
            $env
        );

        $process->start(function ($type, $buffer) {
            if (Process::ERR === $type) {
                Log::info("CONVERT ERROR: " . $buffer);
            }
        }, $env);

        $process->wait();

        if (!$process->isSuccessful()) {
            throw new ProcessFailedException($process);
        }

        return $path['filename'] . '.' . $to;
    }
}