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app/api/places/autocomplete/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 input = searchParams.get("input") || "";
+  const countries = searchParams.get("countries") || "de,fr,ch,at";
+  const countryList = countries
+    .split(",")
+    .map((entry) => entry.trim().toLowerCase())
+    .filter(Boolean)
+    .slice(0, 5);
+  const countryParam = countryList.join(",");
+
+  if (input.trim().length < 3) {
+    return NextResponse.json({ predictions: [] });
+  }
+
+  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({ predictions: [] });
+    }
+
+    const apiUrl = new URL("https://maps.googleapis.com/maps/api/place/autocomplete/json");
+    apiUrl.searchParams.set("input", input);
+    apiUrl.searchParams.set("key", apiKeySetting.value);
+    apiUrl.searchParams.set("language", "de");
+    apiUrl.searchParams.set("types", "geocode");
+    if (countryParam) {
+      apiUrl.searchParams.set("components", `country:${countryParam}`);
+    }
+
+    const response = await fetch(apiUrl.toString());
+    if (!response.ok) {
+      return NextResponse.json({ predictions: [] });
+    }
+
+    const payload = await response.json();
+    return NextResponse.json({ predictions: payload.predictions || [] });
+  }
+
+  const apiUrl = new URL("https://nominatim.openstreetmap.org/search");
+  apiUrl.searchParams.set("format", "jsonv2");
+  apiUrl.searchParams.set("q", input);
+  apiUrl.searchParams.set("addressdetails", "1");
+  apiUrl.searchParams.set("limit", "5");
+  apiUrl.searchParams.set("accept-language", "de");
+  if (countryParam) {
+    apiUrl.searchParams.set("countrycodes", countryParam);
+  }
+
+  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({ predictions: [] });
+  }
+
+  const payload = await response.json();
+  const predictions = Array.isArray(payload)
+    ? payload.map((item: any) => ({
+        description: item.display_name,
+        place_id: String(item.place_id)
+      }))
+    : [];
+  return NextResponse.json({ predictions });
+}