AI 视频扩展回调

const express = require('express');
const fs = require('fs');
const https = require('https');
const app = express();

app.use(express.json());

app.post('/runway-extend-callback', (req, res) => {
  const { code, msg, data } = req.body;
  
  console.log('收到 Runway 视频扩展回调:', {
    taskId: data.task_id,
    status: code,
    message: msg
  });
  
  if (code === 200) {
    // 视频扩展成功
    const { task_id, video_id, video_url, image_url } = data;
    
    console.log('视频扩展成功！');
    console.log(`任务 ID: ${task_id}`);
    console.log(`视频 ID: ${video_id}`);
    console.log(`视频 URL: ${video_url}`);
    console.log(`封面 URL: ${image_url}`);
    
    // 下载视频文件
    if (video_url) {
      downloadFile(video_url, `runway_extend_${task_id}.mp4`)
        .then(() => console.log('视频下载成功'))
        .catch(err => console.error('视频下载失败:', err));
    }
    
    // 下载封面图片
    if (image_url) {
      downloadFile(image_url, `runway_extend_cover_${task_id}.png`)
        .then(() => console.log('封面下载成功'))
        .catch(err => console.error('封面下载失败:', err));
    }
    
  } else {
    // 视频扩展失败
    console.log('Runway 视频扩展失败:', msg);
    
    // 处理特定错误类型
    if (code === 400) {
      console.log('客户端错误 - 检查输入参数和内容');
    } else if (code === 500) {
      console.log('服务器错误 - 请稍后重试');
    }
  }
  
  // 返回 200 状态码确认收到回调
  res.status(200).json({ code: 200, msg: 'success' });
});

// 辅助函数：下载文件
function downloadFile(url, filename) {
  return new Promise((resolve, reject) => {
    const file = fs.createWriteStream(filename);
    
    https.get(url, (response) => {
      if (response.statusCode === 200) {
        response.pipe(file);
        file.on('finish', () => {
          file.close();
          resolve();
        });
      } else {
        reject(new Error(`HTTP ${response.statusCode}`));
      }
    }).on('error', reject);
  });
}

app.listen(3000, () => {
  console.log('回调服务器运行在端口 3000');
});