feat: initialize CalBook project with comprehensive scheduling, admin, and deployment infrastructure

app/api/public/umbuchen/route.ts

@@ -0,0 +1,38 @@
+export const dynamic = "force-dynamic";
+
+import { fail, ok } from "@/lib/api";
+import { enforceRateLimit } from "@/lib/rate-limit";
+import { cancelSchema } from "@/lib/validators/public";
+import { getRescheduleInfo } from "@/lib/services/appointments";
+import { resolveTimeZone } from "@/lib/date";
+
+export async function GET(req: Request) {
+  const url = new URL(req.url);
+  const parsed = cancelSchema.safeParse({ token: url.searchParams.get("token") });
+  const timezone = resolveTimeZone(url.searchParams.get("timezone"));
+
+  const limit = enforceRateLimit({
+    req,
+    scope: "public-reschedule-info",
+    limit: 40,
+    windowMs: 60_000,
+    ...(parsed.success ? { keySuffix: parsed.data.token.slice(0, 12) } : {})
+  });
+
+  if (!limit.ok) {
+    return fail("Zu viele Anfragen. Bitte kurz warten.", 429, {
+      retryAfterSeconds: limit.retryAfterSeconds
+    });
+  }
+
+  if (!parsed.success) {
+    return fail("Token fehlt oder ist ungültig", 400, parsed.error.flatten());
+  }
+
+  const result = await getRescheduleInfo(parsed.data.token, timezone);
+  if (!result.ok) {
+    return fail(result.message, result.status);
+  }
+
+  return ok(result.data);
+}