API errors

def error_message(response):
    """Return a readable message from a CrazyGoldFish error response."""
    try:
        body = response.json()
    except ValueError:
        return f"HTTP {response.status_code}"  # Some 500 errors return HTML
    if "message" in body:  # 401 errors and the token endpoint
        return body["message"]
    if "error" in body:  # Exam, Assignment, Rubrics, Webhooks
        return "; ".join(
            f"{field}: {' '.join(map(str, msgs)) if isinstance(msgs, list) else msgs}"
            for field, msgs in body["error"]["message"].items()
        )
    detail = body.get("detail")
    if isinstance(detail, str):  # 403 errors from Exam, Assignment, Rubrics, Webhooks
        return detail
    if isinstance(detail, list):  # Lesson Plan, Worksheet, Metadata
        return "; ".join(item.get("msg", "") for item in detail)
    return str(body)

async function errorMessage(response) {
  let body;
  try {
    body = await response.json();
  } catch {
    return `HTTP ${response.status}`; // Some 500 errors return HTML
  }
  if (body.message) return body.message; // 401 errors and the token endpoint
  if (body.error) {
    // Exam, Assignment, Rubrics, Webhooks
    return Object.entries(body.error.message)
      .map(([field, msgs]) => `${field}: ${[].concat(msgs).join(" ")}`)
      .join("; ");
  }
  if (typeof body.detail === "string") return body.detail; // 403 errors
  if (Array.isArray(body.detail)) return body.detail.map((item) => item.msg).join("; ");
  return JSON.stringify(body);
}