ldc-com-app-bo/app/Http/Requests/Users/ImportRequest.php

<?php

namespace App\Http\Requests\Users;

use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Support\Facades\Auth;

class ImportRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return boolean
     */
    public function authorize()
    {
        return Auth::check();
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'import' => [
                'required',
                'file',
                'mimes:csv,txt',
                'mimetypes:text/csv,text/plain,application/csv,text/comma-separated-values,text/anytext,application/octet-stream,application/txt',
                function ($attribute, $value, $fail) {
                    if ($this->import->getClientMimeType() !== 'text/csv' && $this->import->getClientMimeType() !== 'application/vnd.ms-excel') {
                        $fail(__('Le fichier doit être d\'un mime type text/csv ou application/vnd.ms-excel'));
                    }
                }
            ]
        ];
    }
}