Add Rate Limiter to API Route

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Overview
In this guide you'll learn how to secure API routes with a rate limit to reduce the risk against bruteforce attacks. If you want to learn more about the configuration of the rate limiter in Shopware, have a look at the rate limiter guide.
Prerequisites
This guide is built upon both the Plugin base guide as well as the Dependency injection guide.
Furthermore you need an existing API route, to create a new one, head over to our Add store API route guide.
Creating a new rate limit
Basic configuration for plugins
First of all, we have to create a new configuration file for our rate limit. In this example we named it rate_limiter.yaml located in <plugin root>/src/Resources/config/. The root key of the configuration is the name which has to be a unique key. In this example we named it example_route.
Each rate limit configuration needs the following keys:
enabled: Enables / Disables the rate limit for the specific route (default value: true).
policy: Possible policies are fixed_window, sliding_window, token_bucket, time_backoff. For more information check the Symfony documentation.
If you plan to configure the time_backoff policy, head over to rate limiter guide. Otherwise, check the Symfony documentation for the other keys you need for each policy.
<plugin root>/src/Resources/config/rate_limiter.yaml
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example_route:
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    enabled: true
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    policy: 'time_backoff'
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Extending rate limit configuration in the DI-container
In this section we will create a small compiler pass called RateLimiterCompilerPass. If you are not very familiar with compiler passes, head over to the Symfony documentation.
Creating compiler pass
<plugin root>/src/CompilerPass/RateLimiterCompilerPass.php
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<?php declare(strict_types=1);
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​
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namespace Swag\BasicExample\CompilerPass;
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​
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use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
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use Symfony\Component\DependencyInjection\ContainerBuilder;
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use Symfony\Component\Yaml\Yaml;
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​
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class RateLimiterCompilerPass implements CompilerPassInterface
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{
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    public function process(ContainerBuilder $container): void
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    {
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        /** @var array<string, array<string, string>> $rateLimiterConfig */
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        $rateLimiterConfig = $container->getParameter('shopware.api.rate_limiter');
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​
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        $rateLimiterConfig += Yaml::parseFile(__DIR__ . '/../Resources/config/rate_limiter.yaml');
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​
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        $container->setParameter('shopware.api.rate_limiter', $rateLimiterConfig);
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    }
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}
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As you can see, we're getting the current configuration of the rate limit from the DI-container and extend it by our rate_limiter.yaml and reassign it with the merged configuration.
Adding compiler pass to the container
Now, we have to add our compiler pass to the container. This will be done by overriding the build() method of our SwagBasicExample plugin class. Important here is to use Symfony\Component\DependencyInjection\Compiler\PassConfig::TYPE_BEFORE_OPTIMIZATION with a higher priority, otherwise it will be built too late.
<plugin root>/src/SwagBasicExample.php
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<?php declare(strict_types=1);
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​
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namespace Swag\BasicExample;
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​
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use Swag\BasicExample\CompilerPass\RateLimiterCompilerPass;
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use Shopware\Core\Framework\Plugin;
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use Shopware\Core\Framework\Plugin\Context\InstallContext;
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use Symfony\Component\DependencyInjection\Compiler\PassConfig;
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use Symfony\Component\DependencyInjection\ContainerBuilder;
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​
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class SwagBasicExample extends Plugin
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{
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    public function build(ContainerBuilder $container): void
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    {
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        parent::build($container);
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​
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        $container->addCompilerPass(new RateLimiterCompilerPass(), PassConfig::TYPE_BEFORE_OPTIMIZATION, 500);
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    }
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}
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Implementing rate limit in API route
Inject service
After we've configured our rate limit, we want to use it in our API route. For this we need to inject the Shopware\Core\Framework\RateLimiter\RateLimiter service.
<plugin root>/src/Core/Content/Example/SalesChannel/ExampleRoute.php
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<?php declare(strict_types=1);
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​
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namespace Swag\BasicExample\Core\Content\Example\SalesChannel;
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​
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use Shopware\Core\Framework\RateLimiter\RateLimiter;
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...
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​
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/**
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 * @RouteScope(scopes={"store-api"})
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 */
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class ExampleRoute extends AbstractExampleRoute
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{
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    private RateLimiter $rateLimiter;
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​
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    public function __construct(RateLimiter $rateLimiter)
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    {
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        $this->rateLimiter = $rateLimiter;
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    }
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​
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    ...
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}
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Call the rate limiter
After we've injected the service into our API route, we can call the limiter in our route method.
To do this, we call the method ensureAccepted of the rate limiter which accepts the following arguments:
route: Unique name of the rate limit, we defined in the configuration.
key: Key we want to use to limit the request e.g., the client IP.
When calling the ensureAccepted method it counts the request for the key in the defined cache. If the limit has been exceeded, it throws Shopware\Core\Framework\RateLimiter\Exception\RateLimitExceededException.
<plugin root>/src/Core/Content/Example/SalesChannel/ExampleRoute.php
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/**
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 * @Route("/store-api/example", name="store-api.example.search", methods={"GET", "POST"})
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*/
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public function load(Request $request, SalesChannelContext $context): ExampleRouteResponse
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{
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    // Limit ip address
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    $this->rateLimiter->ensureAccepted('example_route', $request->getClientIp());
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    ...
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}
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Reset the rate limit
Once we've made a successful request, we want to reset the rate limit for the client. We just have to call the reset method as you can see below.
<plugin root>/src/Core/Content/Example/SalesChannel/ExampleRoute.php
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/**
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 * @Route("/store-api/example", name="store-api.example.search", methods={"GET", "POST"})
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*/
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public function load(Request $request, SalesChannelContext $context): ExampleRouteResponse
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{
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    // Limit ip address for example
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    $this->rateLimiter->ensureAccepted('example_route', $request->getClientIp());
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    // if action was successfully, reset limit 
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    if ($this->doAction() === true) {
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        $this->rateLimiter->reset('example_route', $request->getClientIp());
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    }
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    ...
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}
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Rate Limiter
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Contents
Overview
Prerequisites
Creating a new rate limit
Basic configuration for plugins
Extending rate limit configuration in the DI-container
Creating compiler pass
Adding compiler pass to the container
Implementing rate limit in API route
Inject service
Call the rate limiter
Reset the rate limit