{locale} placeholder in routes

See this PR: https://github.com/codeigniter4/CodeIgniter4/pull/6073

I like the idea of a $useSupportedLocalesOnly option. No need to hack the default behaviour with a filter!

The main question is why you run into this problem, that you need to redirect with right locale? How does the wrong locale appear in your URL? Is it even possible to happen just so?

@kenjis This makes the solution which I posted even better! Like that.

DONE. Fallback behaviour implemented.

Add to: app/Config/Routes.php

PHP Code:

$routes->useDefinedLocalesOnly(true); 


Create file: app/Services/Routes.php

PHP Code:

<?php

namespace App\Services;

use CodeIgniter\Autoloader\FileLocator;
use CodeIgniter\Router\RouteCollection;
use Config\Modules;

class Routes extends RouteCollection
{
    /**
    * @var bool
    */
    public bool $useDefinedLocalesOnly = false;

    public function __construct(FileLocator $locator, Modules $moduleConfig) {
        parent::__construct($locator, $moduleConfig);
    }

    /**
    * @param bool $value
    * @return $this
    */
    public function useDefinedLocalesOnly(bool $value): self {
        $this->useDefinedLocalesOnly = $value;

        return $this;
    }
} 


Add to: app/Services/Router.php (check the code in first post to find the place where to put this)

PHP Code:

                    /**
                    * CORE EDIT START
                    */
                    if ($this->collection->useDefinedLocalesOnly) {
                        $supportedLocales = config('App')->supportedLocales;

                        if (!in_array($temp[$localeSegment], $supportedLocales)) {
                            return false;
                        }
                    }
                    /**
                    * CORE EDIT END
                    */ 


Add use to: app/Config/Services.php

PHP Code:

use App\Services\Router; 


and function

PHP Code:

    /**
    * @param bool $getShared
    * @return Routes
    */
    public static function routes($getShared = true): Routes {
        if ($getShared) {
            return static::getSharedInstance('routes');
        }

        return new Routes(AppServices::locator(), config('Modules'));
    }