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Decorate the Symfony router to add a trailing slash to all URLs

Published at

7/5/2024

Solution - Decorate the Symfony Router

To resolve this I created a decorator for the Symfony default router and have overridden the generate method to add a slash to the end of the URL. It also checks for the presence of ? which would indicate there are query string parameters and in this situation, I am inserting the / before the ? as we want /terms/?utm_campaign=... and not /terms?utm_campaign=.../.

<?php

declare(strict_types=1);

namespace App\Service;

use Symfony\Component\DependencyInjection\Attribute\AsDecorator;
use Symfony\Component\HttpKernel\CacheWarmer\WarmableInterface;
use Symfony\Component\Routing\RequestContext;
use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\Router;
use Symfony\Component\Routing\RouterInterface;

#[AsDecorator('router.default')]
class TrailingSlashUrlGenerator implements RouterInterface, WarmableInterface
{
    public function __construct(
        private readonly Router $urlGenerator,
    ) {}

    public function generate($name, $parameters = [], $referenceType = self::ABSOLUTE_PATH): string
    {
        // Original URL
        $url = $this->urlGenerator->generate($name, $parameters, $referenceType);

        // Add the slash before any query string parameters
        $pos = strpos($url, '?');
        if ($pos !== false) {
            $parts = explode('?', $url, 2);
            if (str_ends_with($parts[0], '/') === false) {
                $parts[0] .= '/';
                return implode('?', $parts);
            }
        }

        // Add the slash at the end of the URL
        if (str_ends_with($url, '/') === false) {
            $url .= '/';
        }

        return $url;
    }

    public function match(string $pathinfo): array
    {
        return $this->urlGenerator->match($pathinfo);
    }

    public function getRouteCollection(): RouteCollection
    {
        return $this->urlGenerator->getRouteCollection();
    }

    public function setContext(RequestContext $context): void
    {
        $this->urlGenerator->setContext($context);
    }

    public function getContext(): RequestContext
    {
        return $this->urlGenerator->getContext();
    }

    public function warmUp(string $cacheDir, ?string $buildDir = null): array
    {
        return [];
    }
}

Note: To host Password Angel as a static site on S3, I have written a Symfony command to generate static versions of all the pages (all 4 of them) and these are uploaded to S3. Let me know if you're interested and I'll post up how the Symfony command works.

Originally published at https://chrisshennan.com/blog/decorate-the-symfony-router-to-add-a-trailing-slash-to-all-urls

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