Handling ICAL import

app/Domains/Event/Actions/GenerateIcal/GenerateIcalCommand.php

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+<?php
+
+namespace App\Domains\Event\Actions\GenerateIcal;
+
+class GenerateIcalCommand
+{
+    public function __construct(public GenerateIcalRequest $request)
+    {
+    }
+
+    public function execute(): GenerateIcalResponse
+    {
+        $participant = $this->request->participant;
+        $event = $participant->event;
+
+        $uid = $participant->identifier . '@' . app('tenant')->slug;
+        $dtStart = $event->start_date->format('Ymd');
+        $dtEnd = $event->end_date->copy()->addDay()->format('Ymd');
+        $now = now()->format('Ymd\THis\Z');
+        $summary = $this->escapeIcal($event->name);
+        $location = $this->escapeIcal(trim($event->postal_code . ' ' . $event->location));
+        $description = $this->escapeIcal('Teilnahme als: ' . $participant->getOfficialName());
+
+        $icalContent = implode("\r\n", [
+                'BEGIN:VCALENDAR',
+                'VERSION:2.0',
+                'PRODID:-//' . app('tenant')->name . '//Veranstaltungskalender//DE',
+                'CALSCALE:GREGORIAN',
+                'METHOD:PUBLISH',
+                'BEGIN:VEVENT',
+                'UID:' . $uid,
+                'DTSTAMP:' . $now,
+                'DTSTART;VALUE=DATE:' . $dtStart,
+                'DTEND;VALUE=DATE:' . $dtEnd,
+                'SUMMARY:' . $summary,
+                'LOCATION:' . $location,
+                'DESCRIPTION:' . $description,
+                'END:VEVENT',
+                'END:VCALENDAR',
+            ]) . "\r\n";
+
+        $filename = 'veranstaltung-' . $participant->event()->first()->name . '.ics';
+
+        return new GenerateIcalResponse($icalContent, $filename);
+    }
+
+    private function escapeIcal(string $value): string
+    {
+        return str_replace(
+            ['\\', ';', ',', "\n"],
+            ['\\\\', '\\;', '\\,', '\\n'],
+            $value
+        );
+    }
+}

app/Domains/Event/Actions/GenerateIcal/GenerateIcalRequest.php

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+<?php
+
+namespace App\Domains\Event\Actions\GenerateIcal;
+
+use App\Models\EventParticipant;
+
+class GenerateIcalRequest
+{
+    public function __construct(public EventParticipant $participant)
+    {
+    }
+}

app/Domains/Event/Actions/GenerateIcal/GenerateIcalResponse.php

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+<?php
+
+namespace App\Domains\Event\Actions\GenerateIcal;
+
+class GenerateIcalResponse
+{
+    public function __construct(
+        public string $icalContent,
+        public string $filename,
+    ) {
+    }
+}