feat: add IPFS gateway route /ipfs/:cid

src/app/ipfs/[cid]/route.ts

@@ -0,0 +1,83 @@
+/**
+ * IPFS Gateway Route — /ipfs/[cid]
+ *
+ * Haalt content op van KUBO via /api/v0/cat en served het als gateway.
+ * Ondersteunt:
+ *   GET /ipfs/:cid           — content ophalen
+ *   GET /ipfs/:cid?filename= — met content-disposition header
+ */
+
+import { NextRequest, NextResponse } from 'next/server';
+import { kuboApiUrl, kuboBasicAuth } from '@/lib/config';
+
+export const dynamic = 'force-dynamic';
+
+export async function GET(
+  req: NextRequest,
+  { params }: { params: Promise<{ cid: string }> },
+) {
+  const { cid } = await params;
+
+  // Valideer CID formaat (Qm... of bafy...)
+  if (!cid || (!cid.startsWith('Qm') && !cid.startsWith('bafy') && !cid.startsWith('bafk'))) {
+    return NextResponse.json({ error: 'Ongeldig CID formaat' }, { status: 400 });
+  }
+
+  const kuboSvc = kuboApiUrl();
+  if (!kuboSvc) {
+    return NextResponse.json({ error: 'KUBO niet geconfigureerd' }, { status: 501 });
+  }
+
+  try {
+    const headers: Record<string, string> = {};
+    const auth = kuboBasicAuth();
+    if (auth) {
+      headers['Authorization'] = 'Basic ' + Buffer.from(auth).toString('base64');
+    }
+
+    // Fetch content via KUBO /api/v0/cat
+    const response = await fetch(`${kuboSvc}/api/v0/cat?arg=${encodeURIComponent(cid)}`, {
+      method: 'POST',
+      headers,
+      signal: AbortSignal.timeout(30000),
+    });
+
+    if (!response.ok) {
+      const text = await response.text().catch(() => '');
+      return NextResponse.json(
+        { error: `KUBO cat gefaald: ${response.status}`, detail: text.slice(0, 200) },
+        { status: response.status },
+      );
+    }
+
+    // Bepaal content type op basis van CID prefix
+    const contentType = detectContentType(cid);
+
+    // Check of filename is opgegeven
+    const filename = req.nextUrl.searchParams.get('filename');
+    const headersOut: Record<string, string> = {
+      'Content-Type': contentType,
+      'Content-Disposition': filename
+        ? `inline; filename="${filename}"`
+        : 'inline',
+      'Cache-Control': 'public, max-age=31536000, immutable',
+    };
+
+    const body = await response.arrayBuffer();
+    return new NextResponse(body, { headers: headersOut });
+
+  } catch (err) {
+    const msg = err instanceof Error ? err.message : 'Gateway fetch failed';
+    console.error(`[ipfs-gateway] Error fetching ${cid}:`, msg);
+    return NextResponse.json({ error: msg }, { status: 502 });
+  }
+}
+
+/**
+ * Detecteer content type op basis van CID prefix.
+ * IPFS content is meestal JSON, tenzij het een bekend formaat is.
+ */
+function detectContentType(cid: string): string {
+  // Voor nu: standaard octet-stream, KUBO bepaalt het echte type
+  return 'application/octet-stream';
+}