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app/api/places/reverse/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 lat = searchParams.get("lat");
+  const lng = searchParams.get("lng");
+
+  if (!lat || !lng) {
+    return NextResponse.json({ error: "Koordinaten 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/geocode/json");
+    apiUrl.searchParams.set("latlng", `${lat},${lng}`);
+    apiUrl.searchParams.set("key", apiKeySetting.value);
+    apiUrl.searchParams.set("language", "de");
+
+    const response = await fetch(apiUrl.toString());
+    if (!response.ok) {
+      return NextResponse.json({ error: "Fehler beim Laden." }, { status: 400 });
+    }
+
+    const payload = await response.json();
+    const result = payload?.results?.[0];
+    return NextResponse.json({
+      label: result?.formatted_address || null,
+      placeId: result?.place_id || null
+    });
+  }
+
+  const apiUrl = new URL("https://nominatim.openstreetmap.org/reverse");
+  apiUrl.searchParams.set("format", "jsonv2");
+  apiUrl.searchParams.set("lat", lat);
+  apiUrl.searchParams.set("lon", lng);
+  apiUrl.searchParams.set("addressdetails", "1");
+
+  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();
+  return NextResponse.json({
+    label: payload?.display_name || null,
+    placeId: payload?.place_id ? String(payload.place_id) : null
+  });
+}