BookStack/app/Providers/CustomValidationServiceProvider.php

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<?php
namespace BookStack\Providers;
use Illuminate\Support\Facades\Validator;
use Illuminate\Support\ServiceProvider;
class CustomValidationServiceProvider extends ServiceProvider
{
/**
* Register our custom validation rules when the application boots.
*/
public function boot(): void
{
Validator::extend('image_extension', function ($attribute, $value, $parameters, $validator) {
$validImageExtensions = ['png', 'jpg', 'jpeg', 'gif', 'webp'];
return in_array(strtolower($value->getClientOriginalExtension()), $validImageExtensions);
});
Validator::extend('safe_url', function ($attribute, $value, $parameters, $validator) {
$cleanLinkName = strtolower(trim($value));
$isJs = strpos($cleanLinkName, 'javascript:') === 0;
$isData = strpos($cleanLinkName, 'data:') === 0;
return !$isJs && !$isData;
});
}
}