Add some routing, start working on actually searching webmentions

src/Endpoint.php

@@ -2,7 +2,11 @@
 
 namespace Lewisdale\Webmentions;
 
+use Lewisdale\Webmentions\Exceptions\InvalidTargetException;
+use Lewisdale\Webmentions\Exceptions\InvalidUrlException;
 use Lewisdale\Webmentions\Gateways\WebmentionGatewayInterface;
+use Lewisdale\Webmentions\Models\Webmention;
+use Symfony\Component\HttpClient\HttpClient;
 
 class Endpoint {
     private readonly WebmentionGatewayInterface $gateway;
@@ -16,19 +20,35 @@ class Endpoint {
         // Validate that both source and target are actual domains
         if (!$this->validateUrl($source) || !$this->validateUrl($target))
         {
-            return;
+            throw new InvalidUrlException();
         }
 
         // Validate that the webmention target is a domain I care about
         if (!str_contains($target, "https://lewisdale.dev")) {
-            // Should throw a Bad Request error
-            return;  
+            throw new InvalidTargetException();
         }
 
         // Parse content from the source
+        $client = HttpClient::create();
+        $response = $client->request('GET', $source);
 
-        // Store the webmention
+        if ($response->getStatusCode() === 200)
+        {
+            $content = $this->parseContent($response->getContent());
+            $author = $this->parseAuthor($response->getContent());
 
-        // Send the appropriate response
+            $webmention = new Webmention(null, $target, $source, $content, $author);
+            $this->gateway->save($webmention);
+        }
+    }
+
+    private function parseContent(string $content) : ?string
+    {
+        return null;
+    }
+
+    private function parseAuthor(string $author) : ?string
+    {
+        return null;
     }
 }