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app/api/places/details/route.ts

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+import { NextResponse } from "next/server";
+import { prisma } from "../../../../lib/prisma";
+import { requireSession } from "../../../../lib/auth-helpers";
+
+export async function GET(request: Request) {
+  const { session } = await requireSession();
+  if (!session) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+
+  const { searchParams } = new URL(request.url);
+  const placeId = searchParams.get("placeId") || "";
+
+  if (!placeId) {
+    return NextResponse.json({ error: "PlaceId erforderlich." }, { status: 400 });
+  }
+
+  const apiKeySetting = await prisma.setting.findUnique({
+    where: { key: "google_places_api_key" }
+  });
+  const providerSetting = await prisma.setting.findUnique({
+    where: { key: "geocoding_provider" }
+  });
+  const provider =
+    providerSetting?.value || (apiKeySetting?.value ? "google" : "osm");
+
+  if (provider === "google") {
+    if (!apiKeySetting?.value) {
+      return NextResponse.json({ error: "API-Key fehlt." }, { status: 400 });
+    }
+
+    const apiUrl = new URL("https://maps.googleapis.com/maps/api/place/details/json");
+    apiUrl.searchParams.set("place_id", placeId);
+    apiUrl.searchParams.set("fields", "geometry/location");
+    apiUrl.searchParams.set("key", apiKeySetting.value);
+
+    const response = await fetch(apiUrl.toString());
+    if (!response.ok) {
+      return NextResponse.json({ error: "Fehler beim Laden." }, { status: 400 });
+    }
+
+    const payload = await response.json();
+    const location = payload?.result?.geometry?.location;
+    return NextResponse.json({
+      lat: location?.lat ?? null,
+      lng: location?.lng ?? null
+    });
+  }
+
+  const apiUrl = new URL("https://nominatim.openstreetmap.org/details");
+  apiUrl.searchParams.set("place_id", placeId);
+  apiUrl.searchParams.set("format", "json");
+
+  const userAgent = process.env.NOMINATIM_USER_AGENT || "vereinskalender/1.0";
+  const response = await fetch(apiUrl.toString(), {
+    headers: { "User-Agent": userAgent }
+  });
+  if (!response.ok) {
+    return NextResponse.json({ error: "Fehler beim Laden." }, { status: 400 });
+  }
+
+  const payload = await response.json();
+  const coords = payload?.centroid?.coordinates;
+  const lat = Array.isArray(coords) ? Number(coords[1]) : Number(payload?.lat);
+  const lng = Array.isArray(coords) ? Number(coords[0]) : Number(payload?.lon);
+
+  return NextResponse.json({
+    lat: Number.isFinite(lat) ? lat : null,
+    lng: Number.isFinite(lng) ? lng : null
+  });
+}