任务轮询与素材下载

5 秒 → 8 秒 → 13 秒 → 20 秒 → 30 秒 → 之后每 30 秒一次

async function waitForTask(taskId, apiKey) {
  const delays = [5000, 8000, 13000, 20000, 30000];
  const startedAt = Date.now();
  let attempt = 0;

  while (Date.now() - startedAt < 15 * 60 * 1000) {
    const delay = delays[Math.min(attempt, delays.length - 1)];
    await new Promise(resolve => setTimeout(resolve, delay));

    const response = await fetch(
      `https://api.ch88.cn/v1/open/tasks/${encodeURIComponent(taskId)}`,
      { headers: { Authorization: `Bearer ${apiKey}` } },
    );

    if (response.status === 429) {
      const retryAfter = Number(response.headers.get('Retry-After')) || 30;
      await new Promise(resolve => setTimeout(resolve, retryAfter * 1000));
      continue;
    }

    if (!response.ok) {
      throw new Error(`查询失败：${response.status} ${await response.text()}`);
    }

    const responseBody = await response.json();
    const task = responseBody.data;
    if (task.status === 'succeeded') return task;
    if (task.status === 'failed' || task.status === 'cancelled') {
      throw new Error(JSON.stringify(task.error ?? { status: task.status }));
    }

    attempt += 1;
  }

  throw new Error('等待任务超时，任务可能仍在后台处理');
}

curl --location '<RESULT_IMAGE_URL>' --output result.png