invoiceninja/app/Http/Requests/Invoice/UpdateInvoiceRequest.php

<?php
/**
 * Invoice Ninja (https://invoiceninja.com).
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2020. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://opensource.org/licenses/AAL
 */

namespace App\Http\Requests\Invoice;

use App\Http\Requests\Request;
use App\Http\ValidationRules\Invoice\LockedInvoiceRule;
use App\Utils\Traits\ChecksEntityStatus;
use App\Utils\Traits\CleanLineItems;
use App\Utils\Traits\MakesHash;

class UpdateInvoiceRequest extends Request
{
    use MakesHash;
    use CleanLineItems;
    use ChecksEntityStatus;

    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize() : bool
    {
        return auth()->user()->can('edit', $this->invoice);
    }

    public function rules()
    {
        $rules = [];

        if ($this->input('documents') && is_array($this->input('documents'))) {
            $documents = count($this->input('documents'));

            foreach (range(0, $documents) as $index) {
                $rules['documents.'.$index] = 'file|mimes:png,ai,svg,jpeg,tiff,pdf,gif,psd,txt,doc,xls,ppt,xlsx,docx,pptx|max:20000';
            }
        } elseif ($this->input('documents')) {
            $rules['documents'] = 'file|mimes:png,ai,svg,jpeg,tiff,pdf,gif,psd,txt,doc,xls,ppt,xlsx,docx,pptx|max:20000';
        }

        $rules['id'] = new LockedInvoiceRule($this->invoice);

        if ($this->input('number') && strlen($this->input('number')) >= 1) {
            $rules['number'] = 'unique:invoices,number,'.$this->id.',id,company_id,'.$this->invoice->company_id;
        }

        return $rules;
    }

    protected function prepareForValidation()
    {
        $input = $this->all();

        $input = $this->decodePrimaryKeys($input);

        $input['id'] = $this->invoice->id;
        
        $input['line_items'] = isset($input['line_items']) ? $this->cleanItems($input['line_items']) : [];

        $this->replace($input);
    }

    public function messages()
    {
        return [
            'id' => ctrans('text.locked_invoice'),
        ];
    }
}