feat(#129): add iCal response parser

app/Services/Plugin/Parsers/XmlResponseParser.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Services\Plugin\Parsers;
+
+use Exception;
+use Illuminate\Http\Client\Response;
+use Illuminate\Support\Facades\Log;
+use SimpleXMLElement;
+
+class XmlResponseParser implements ResponseParser
+{
+    public function parse(Response $response): ?array
+    {
+        $contentType = $response->header('Content-Type');
+
+        if (! $contentType || ! str_contains(mb_strtolower($contentType), 'xml')) {
+            return null;
+        }
+
+        try {
+            $xml = simplexml_load_string($response->body());
+            if ($xml === false) {
+                throw new Exception('Invalid XML content');
+            }
+
+            return ['rss' => $this->xmlToArray($xml)];
+        } catch (Exception $exception) {
+            Log::warning('Failed to parse XML response: '.$exception->getMessage());
+
+            return ['error' => 'Failed to parse XML response'];
+        }
+    }
+
+    private function xmlToArray(SimpleXMLElement $xml): array
+    {
+        $array = (array) $xml;
+
+        foreach ($array as $key => $value) {
+            if ($value instanceof SimpleXMLElement) {
+                $array[$key] = $this->xmlToArray($value);
+            }
+        }
+
+        return $array;
+    }
+}