Add rules to prevent tracking of certain requests

Classes/Middleware/Pageview.php

@@ -27,6 +27,8 @@ use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
 use Psr\Http\Server\MiddlewareInterface;
 use Psr\Http\Server\RequestHandlerInterface;
+use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
+use TYPO3\CMS\Core\Context\Context;
 
 class Pageview implements MiddlewareInterface
 {
@@ -35,17 +37,41 @@ class Pageview implements MiddlewareInterface
      */
     private $repository;
 
-    public function __construct(Repository $repository)
+    /**
+     * @var Context
+     */
+    private $context;
+
+    /**
+     * @var string
+     */
+    private $rule = '';
+
+    public function __construct(Repository $repository, Context $context, string $rule)
     {
         $this->repository = $repository;
+        $this->context = $context;
+        $this->rule = $rule;
     }
 
     public function process(
         ServerRequestInterface $request,
         RequestHandlerInterface $handler
     ): ResponseInterface {
+        if ($this->shouldTrack($request, $this->context)) {
             $this->repository->add(Factory::fromRequest($request));
+        }
 
         return $handler->handle($request);
     }
+
+    private function shouldTrack(
+        ServerRequestInterface $request,
+        Context $context
+    ): bool {
+        return (bool) (new ExpressionLanguage())->evaluate($this->rule, [
+            'request' => $request,
+            'context' => $context,
+        ]);
+    }
 }

Configuration/Services.yaml

@@ -18,3 +18,11 @@ services:
     public: true
     arguments:
       - '@DanielSiepmann\DI\DatabaseConnection\Pageview'
+
+  DanielSiepmann\Tracking\Middleware\Pageview:
+    public: true
+    arguments:
+      $rule: >
+          not (context.getAspect("backend.user").isLoggedIn())
+          and not (request.getHeader("User-Agent")[0] matches "/^Wget/")
+          and not (request.getHeader("User-Agent")[0] matches "/Googlebot|Bingbot|Slurp|DuckDuckBot|Baiduspider|YandexBot|Sogou|Exabot/")