ladill-transfer/app/Models/TransferFile.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Support\Facades\Storage;

class TransferFile extends Model
{
    protected $fillable = [
        'transfer_id',
        'original_name',
        'disk',
        'path',
        'mime_type',
        'size_bytes',
        'downloads_total',
    ];

    protected $casts = [
        'size_bytes' => 'integer',
        'downloads_total' => 'integer',
    ];

    public function transfer(): BelongsTo
    {
        return $this->belongsTo(Transfer::class);
    }

    public function downloadEvents(): HasMany
    {
        return $this->hasMany(TransferDownloadEvent::class);
    }

    public function humanSize(): string
    {
        $bytes = $this->size_bytes;
        if ($bytes >= 1073741824) {
            return number_format($bytes / 1073741824, 1).' GB';
        }
        if ($bytes >= 1048576) {
            return number_format($bytes / 1048576, 1).' MB';
        }
        if ($bytes >= 1024) {
            return number_format($bytes / 1024, 0).' KB';
        }

        return $bytes.' B';
    }

    public function existsOnDisk(): bool
    {
        return Storage::disk($this->disk)->exists($this->path);
    }
}