spb/polyllm

1"use client";2import { ClientApiError } from "@/lib/client/api";34/** POST /api/arena/:id/export?format= and save the file through a temporary object URL. */5export async function downloadArenaExport(sessionId: string, format: "markdown" | "json"): Promise<string> {6  const res = await fetch(`/api/arena/${encodeURIComponent(sessionId)}/export?format=${format}`, { method: "POST", credentials: "same-origin" });7  if (!res.ok) {8    let err: { error?: { code?: string; message?: string } } = {};9    try {10      err = await res.json();11    } catch {12      /* ignore */13    }14    throw new ClientApiError(res.status, err.error?.code ?? "HTTP_ERROR", err.error?.message ?? `Export failed (${res.status})`);15  }16  const blob = await res.blob();17  const cd = res.headers.get("Content-Disposition") ?? "";18  const filename = res.headers.get("X-Filename") ?? /filename="([^"]+)"/.exec(cd)?.[1] ?? `arena.${format === "json" ? "json" : "md"}`;19  const url = URL.createObjectURL(blob);20  const a = document.createElement("a");21  a.href = url;22  a.download = filename;23  document.body.appendChild(a);24  a.click();25  a.remove();26  setTimeout(() => URL.revokeObjectURL(url), 2000);27  return filename;28}29