file/app/Http/Requests/FileStoreRequest.php

<?php

namespace App\Http\Requests;

use App\Models\Collection;

use Illuminate\Foundation\Http\FormRequest;

class FileStoreRequest extends FormRequest
{

    private $collection = null;

    public function __construct()
    {

        $this->collection = Collection::where('name',$this->collection_name)->get();
    }

    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    private function getExts()
    {
        return implode(",",$this->collection->exts);
    }

    private function getMimeTypes()
    {
        return implode(",",$this->collection->mimetypes);
    }

    // private function getExt()
    // {
    //     return implode(",",$this->collection->ext);
    // }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array<string, mixed>
     */
    public function rules()
    {
        return [
            "ext" => ["mimes:" . $this->getExts],
            "memetype" => ["mimetypes:" . $this->getMimeTypes],
            "width"=> [''],
            "height"=> [''],
            "file_size"=> [''],
        ];
    }
}