feat: build production-ready wtr weather PWA

app/api/imgw/[...path]/route.ts

@@ -0,0 +1,39 @@
+import { NextResponse } from "next/server";
+
+const ALLOWED_PATHS = new Set([
+  "synop",
+  "hydro",
+  "meteo",
+  "warningsmeteo",
+  "warningshydro",
+  "product",
+]);
+const IMGW_BASE_URL = "https://danepubliczne.imgw.pl/api/data";
+
+export async function GET(_: Request, context: { params: Promise<{ path: string[] }> }) {
+  const { path } = await context.params;
+  const [resource, variant, value] = path;
+
+  const isAllowedSynopDetail = resource === "synop" && variant === "id" && Boolean(value) && path.length === 3;
+  const isAllowedCollection = ALLOWED_PATHS.has(resource) && path.length === 1;
+  if (!isAllowedSynopDetail && !isAllowedCollection) {
+    return NextResponse.json({ error: "Nieobsługiwana ścieżka IMGW." }, { status: 404 });
+  }
+
+  const upstreamPath = path.map(encodeURIComponent).join("/");
+  try {
+    const response = await fetch(`${IMGW_BASE_URL}/${upstreamPath}`, {
+      next: { revalidate: 300 },
+      headers: { Accept: "application/json" },
+    });
+    if (!response.ok) {
+      return NextResponse.json({ error: "IMGW API jest chwilowo niedostępne." }, { status: response.status });
+    }
+    const data: unknown = await response.json();
+    return NextResponse.json(data, {
+      headers: { "Cache-Control": "public, s-maxage=300, stale-while-revalidate=600" },
+    });
+  } catch {
+    return NextResponse.json({ error: "Nie udało się połączyć z IMGW API." }, { status: 502 });
+  }
+}