feat: support lan/tailnet endpoint selection for presigned URLs

apps/web/app/api/assets/[id]/url/route.ts

@@ -39,10 +39,12 @@ export async function GET(
   const kindParam = url.searchParams.get("kind");
   const sizeParam = url.searchParams.get("size");
   const legacyVariantParam = url.searchParams.get("variant");
+  const endpointParam = url.searchParams.get("endpoint");
 
   let requestedKind: z.infer<typeof kindSchema> = "original";
   let requestedSize: number | null = null;
   let legacyVariant: z.infer<typeof legacyVariantSchema> | null = null;
+  let endpointOverride: "lan" | "tailnet" | undefined;
 
   if (kindParam) {
     const kindParsed = kindSchema.safeParse(kindParam);
@@ -81,6 +83,25 @@ export async function GET(
     requestedSize = "size" in mapped ? mapped.size : null;
   }
 
+  if (endpointParam) {
+    if (endpointParam !== "lan" && endpointParam !== "tailnet") {
+      return Response.json(
+        {
+          error: "invalid_query",
+          issues: [
+            {
+              code: "custom",
+              message: "endpoint must be lan or tailnet",
+              path: ["endpoint"],
+            },
+          ],
+        },
+        { status: 400 },
+      );
+    }
+    endpointOverride = endpointParam;
+  }
+
   const db = getDb();
   const rows = await db<
     {
@@ -171,6 +192,7 @@ export async function GET(
     key,
     responseContentType,
     responseContentDisposition,
+    endpoint: endpointOverride,
   });
 
   return Response.json(signed, {