Veo3.1 视频生成回调

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

app.use(express.json());

app.post('/veo3-1-callback', (req, res) => {
  const { code, msg, data } = req.body;
  
  console.log('收到 Veo3 视频生成回调:', {
    taskId: data.taskId,
    status: code,
    message: msg
  });
  
  if (code === 200) {
    // 视频生成成功
    const { taskId, info, fallbackFlag } = data;
    const { resultUrls, originUrls, resolution } = info;
    
    console.log('视频生成成功！');
    console.log(`任务 ID: ${taskId}`);
    console.log(`生成视频 URL: ${resultUrls}`);
    console.log(`视频分辨率: ${resolution}`);
    console.log(`是否使用托底模型: ${fallbackFlag ? '是' : '否'}`);
    if (originUrls) {
      console.log(`原始视频 URL: ${originUrls}`);
    }
    
    // 下载生成的视频文件
    resultUrls.forEach((url, index) => {
      if (url) {
        downloadFile(url, `veo3.1_generated_${taskId}_${index}.mp4`)
          .then(() => console.log(`视频 ${index + 1} 下载成功`))
          .catch(err => console.error(`视频 ${index + 1} 下载失败:`, err));
      }
    });
    
    // 下载原始视频文件（如果存在）
    if (originUrls) {
      originUrls.forEach((url, index) => {
        if (url) {
          downloadFile(url, `veo3.1_original_${taskId}_${index}.mp4`)
            .then(() => console.log(`原始视频 ${index + 1} 下载成功`))
            .catch(err => console.error(`原始视频 ${index + 1} 下载失败:`, err));
        }
      });
    }
    
  } else {
    // 视频生成失败
    console.log('Veo3.1 视频生成失败:', msg);
    
    // 处理特定错误类型
    if (code === 400) {
      console.log('客户端错误 - 检查提示词和内容政策');
    } else if (code === 422) {
      console.log('托底失败 - 建议开启托底功能（enableFallback: true）');
    } else if (code === 500) {
      console.log('服务器内部错误 - 请稍后重试');
    } else if (code === 501) {
      console.log('任务失败 - 视频生成失败');
    }
  }
  
  // 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');
});