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lib/ical-export.ts

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+import ical from "ical-generator";
+import { NextResponse } from "next/server";
+import { prisma } from "./prisma";
+
+const DEFAULT_APP_NAME = "Vereinskalender";
+
+const toFilename = (value: string) =>
+  value
+    .trim()
+    .toLowerCase()
+    .replace(/[^a-z0-9]+/g, "-")
+    .replace(/(^-|-$)/g, "") || "kalender";
+
+export async function getIcalResponse(request: Request, token: string) {
+  const view = await prisma.userView.findUnique({
+    where: { token },
+    include: {
+      items: { include: { event: true } },
+      categories: true,
+      exclusions: true,
+      user: true
+    }
+  });
+
+  if (!view) {
+    return NextResponse.json({ error: "Not found" }, { status: 404 });
+  }
+
+  const appNameSetting = await prisma.setting.findUnique({
+    where: { key: "app_name" }
+  });
+  const appName = appNameSetting?.value || DEFAULT_APP_NAME;
+  const url = new URL(request.url);
+  const pastDaysParam = Number(url.searchParams.get("pastDays"));
+  const rawPastDays =
+    Number.isFinite(pastDaysParam) && pastDaysParam >= 0
+      ? pastDaysParam
+      : Number.isFinite(view.icalPastDays) && view.icalPastDays >= 0
+      ? view.icalPastDays
+      : 14;
+  const pastDays = Math.min(365, Math.floor(rawPastDays));
+  const cutoff = new Date(Date.now() - pastDays * 24 * 60 * 60 * 1000);
+
+  const calendar = ical({
+    name: appName,
+    timezone: "Europe/Berlin"
+  });
+
+  const excludedIds = new Set(view.exclusions.map((item) => item.eventId));
+  const explicitEvents = view.items
+    .map((item) => item.event)
+    .filter((event) => event.status === "APPROVED");
+
+  const categoryIds = view.categories.map((item) => item.categoryId);
+  const categoryEvents =
+    categoryIds.length > 0
+      ? await prisma.event.findMany({
+          where: { categoryId: { in: categoryIds }, status: "APPROVED" }
+        })
+      : [];
+
+  const combined = [...explicitEvents, ...categoryEvents].filter(
+    (event, index, all) =>
+      all.findIndex((item) => item.id === event.id) === index &&
+      !excludedIds.has(event.id) &&
+      event.startAt >= cutoff
+  );
+
+  combined.forEach((event) => {
+    const start = event.startAt;
+    const end =
+      event.endAt || new Date(event.startAt.getTime() + 3 * 60 * 60 * 1000);
+    calendar.createEvent({
+      id: event.id,
+      summary: event.title,
+      description: event.description || undefined,
+      location: event.location || undefined,
+      start,
+      end
+    });
+  });
+
+  const filename = `${toFilename(appName)}.ical`;
+
+  return new NextResponse(calendar.toString(), {
+    headers: {
+      "Content-Type": "text/calendar; charset=utf-8",
+      "Content-Disposition": `attachment; filename="${filename}"`
+    }
+  });
+}