Forward JSON registration POST bodies through the ladl.link proxy.

Event signup from ladl.link sends application/json; re-encoding as form
data dropped the payload and caused failed registrations to redirect to
ladl.link/undefined.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Services/Link/LinkPlatformProxy.php

@@ -74,7 +74,7 @@ class LinkPlatformProxy
             ->withHeaders($this->forwardHeaders($request));
 
         $pending = match ($method) {
-            'POST' => $client->asForm()->post($target, $request->post()),
+            'POST' => $this->forwardPost($client, $request, $target),
             'PATCH' => $client->patch($target, $request->all()),
             'DELETE' => $client->delete($target),
             default => $client->get($target),
@@ -143,12 +143,27 @@ class LinkPlatformProxy
         return array_filter([
             'Accept' => $request->header('Accept'),
             'Accept-Language' => $request->header('Accept-Language'),
+            'Content-Type' => $request->header('Content-Type'),
             'User-Agent' => $request->header('User-Agent'),
             'Referer' => $request->header('Referer'),
             self::INTERNAL_HEADER => '1',
         ]);
     }
 
+    private function forwardPost(\Illuminate\Http\Client\PendingRequest $client, Request $request, string $target): \Illuminate\Http\Client\Response
+    {
+        if ($this->requestSendsJson($request)) {
+            return $client->asJson()->post($target, $request->all());
+        }
+
+        return $client->asForm()->post($target, $request->post());
+    }
+
+    private function requestSendsJson(Request $request): bool
+    {
+        return str_contains(strtolower((string) $request->header('Content-Type', '')), 'application/json');
+    }
+
     /** @param array<string, array<int, string>> $headers */
     private function sanitizeHeaders(array $headers): array
     {

tests/Feature/LinkRedirectTest.php

@@ -154,4 +154,52 @@ class LinkRedirectTest extends TestCase
             return str_starts_with($request->url(), 'https://ladill.com/q/sales-webinar/registered/');
         });
     }
+
+    public function test_event_registration_post_forwards_json_body_to_events(): void
+    {
+        $user = $this->user();
+        ShortLink::create([
+            'user_id' => $user->id,
+            'slug' => 'sales-webinar',
+            'source_app' => 'events',
+            'source_kind' => 'qr',
+            'is_managed_here' => false,
+            'destination_url' => 'https://ladl.link/sales-webinar',
+            'is_active' => true,
+        ]);
+
+        Http::fake([
+            'https://events.ladill.com/q/sales-webinar/register' => function ($request) {
+                $payload = json_decode($request->body(), true);
+
+                return Http::response(json_encode([
+                    'paid' => false,
+                    'success_url' => 'https://ladl.link/sales-webinar/registered/QRE-TESTREF123456',
+                    'badge_code' => 'BADGE123',
+                ]), 200, ['Content-Type' => 'application/json']);
+            },
+        ]);
+
+        $this->postJson('https://ladl.link/sales-webinar/register', [
+            'tier' => 'General Admission',
+            'attendee_name' => 'Jane Doe',
+            'attendee_email' => 'jane@example.com',
+            'attendee_phone' => '+233200000000',
+        ])
+            ->assertOk()
+            ->assertJsonPath('success_url', 'https://ladl.link/sales-webinar/registered/QRE-TESTREF123456');
+
+        Http::assertSent(function ($request) {
+            if ($request->url() !== 'https://events.ladill.com/q/sales-webinar/register') {
+                return false;
+            }
+
+            $payload = json_decode($request->body(), true);
+
+            return is_array($payload)
+                && ($payload['attendee_email'] ?? '') === 'jane@example.com'
+                && ($payload['tier'] ?? '') === 'General Admission'
+                && $request->hasHeader('X-Ladill-Internal', '1');
+        });
+    }
 }