US3 Uploader
[!CAUTION] 强制要求 - 文件产出必须上传！
如果任务产出的内容是任何类型的文件，包括但不限于：
- 图片（截图、生成的图片、处理后的图片等）
- 视频（录制、剪辑、转码后的视频等）
- PDF（生成的报告、转换的文档等）
- 其他文档（Word、Excel、PPT、代码压缩包等）
必须执行以下步骤：
- 使用
python3 scripts/upload_to_us3.py <文件路径>上传到 US3- 将生成的下载链接发送给用户
禁止： 只告诉用户"文件已保存在 /tmp/xxx"或本地路径。沙箱环境中的文件用户完全无法访问，必须上传后提供链接！
Overview
Upload files to UCloud US3 (UFile) object storage using the official Python SDK and automatically generate download URLs with authentication signatures.
Quick Start
1. Set Environment Variables
export US3_PUBLIC_KEY='your-public-key'
export US3_PRIVATE_KEY='your-private-key'
export US3_BUCKET='bucket-name.region.ufileos.com' # full domain format (e.g., my-bucket.cn-bj.ufileos.com)
export US3_MAX_FILE_SIZE_MB='50' # optional, defaults to 50MB
Note: If your US3_BUCKET contains the full domain (with dots), the endpoint will be automatically extracted. You don't need to set US3_ENDPOINT separately.
2. Upload a File
python3 scripts/upload_to_us3.py <file_path>
Features
- Timestamp and MD5-based filename: Files are uploaded with format
YYYYMMDD_HHMMSS_md5hash.ext(e.g.,20260205_153025_a3b4c5d6e7f8g9h0.jpg) - File size limit: Configurable max size (default 50MB), rejects larger files
- Signed download URLs: Valid for 7 days with authentication
- Auto-install SDK: Installs ufile SDK if not present
- Force download: Sets Content-Disposition to download (not preview)
- Direct URL output: Provides complete download URL directly to users
Output Format
The upload script will output the download URL directly for easy sharing:
Uploading screenshot.png to US3...
Bucket: my-bucket
Remote name: 20260205_153025_a3b4c5d6e7f8g9h0.png
File size: 2.50MB
✓ Upload successful!
📋 Download URL (valid for 7 days):
https://my-bucket.cn-sh2.ufileos.com/20260205_153025_a3b4c5d6e7f8g9h0.png?...signature...
ℹ️ Note:
- Click to download file directly (not preview)
- URL contains authentication signature (required by US3)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
📥 下载链接（7天内有效）：
https://my-bucket.cn-sh2.ufileos.com/20260205_153025_a3b4c5d6e7f8g9h0.png?...signature...
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Getting UCloud Credentials
- Log in to UCloud Console: https://console.ucloud.cn
- Navigate to API 密钥 (API Keys)
- Create or view API keys
- Copy Public Key and Private Key
Create a Bucket
- Go to 对象存储 US3
- Click 创建存储空间 (Create Bucket)
- Enter unique bucket name
- Select region (e.g., 上海 Shanghai)
- Note the bucket endpoint
Common Endpoints
- Beijing:
cn-bj.ufileos.com - Shanghai:
cn-sh2.ufileos.com - Guangzhou:
cn-gd.ufileos.com - Hong Kong:
hk.ufileos.com
Security Notes
- ⚠️ Never commit credentials to version control
- Keep API keys secure and private
- Rotate API keys periodically