file-upload-handling
Implement secure file upload handling with validation, virus scanning, storage management, and serving files efficiently. Use when building file upload features, managing file storage, and implementing file download systems.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/aj-geddes/useful-ai-prompts --skill file-upload-handling- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads file-upload-handling automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
File Upload Handling
Table of Contents
Overview
Build secure and robust file upload systems with validation, sanitization, virus scanning, efficient storage management, CDN integration, and proper file serving mechanisms across different backend frameworks.
When to Use
- Implementing file upload features
- Managing user-uploaded documents
- Storing and serving media files
- Implementing profile picture uploads
- Building document management systems
- Handling bulk file imports
Quick Start
Minimal working example:
# config.py
import os
class Config:
MAX_CONTENT_LENGTH = 50 * 1024 * 1024 # 50 MB
UPLOAD_FOLDER = 'uploads'
ALLOWED_EXTENSIONS = {'txt', 'pdf', 'png', 'jpg', 'jpeg', 'gif', 'docx', 'doc'}
UPLOAD_DIRECTORY = os.path.join(os.path.dirname(__file__), UPLOAD_FOLDER)
# file_service.py
import os
import mimetypes
import hashlib
import secrets
from werkzeug.utils import secure_filename
from datetime import datetime
import magic
import aiofiles
class FileUploadService:
def __init__(self, upload_dir, allowed_extensions, max_size=50*1024*1024):
self.upload_dir = upload_dir
self.allowed_extensions = allowed_extensions
self.max_size = max_size
self.mime = magic.Magic(mime=True)
// ... (see reference guides for full implementation)
Reference Guides
Detailed implementations in the references/ directory:
| Guide | Contents |
|---|---|
| Python/Flask File Upload | Python/Flask File Upload |
| Node.js Express File Upload with Multer | Node.js Express File Upload with Multer |
| FastAPI File Upload | FastAPI File Upload |
| S3/Cloud Storage Integration | S3/Cloud Storage Integration |
Best Practices
✅ DO
- Validate file extensions and MIME types
- Check file size before processing
- Use secure filenames to prevent directory traversal
- Store files outside web root
- Implement virus scanning
- Use CDN for file delivery
- Generate signed URLs for direct access
- Log file upload/download events
- Implement access control checks
- Clean up temporary files
❌ DON'T
- Trust user-provided filenames
- Store files in web-accessible directories
- Allow arbitrary file types
- Skip virus scanning for uploaded files
- Expose absolute file paths
- Allow unlimited file sizes
- Ignore access control
- Use predictable file paths
- Store sensitive metadata in filenames
- Forget to validate file content
FAQ
What does the file-upload-handling skill do?
Implement secure file upload handling with validation, virus scanning, storage management, and serving files efficiently. Use when building file upload features, managing file storage, and implementing file download systems.
How do I install file-upload-handling?
Run npx skills add https://github.com/aj-geddes/useful-ai-prompts --skill file-upload-handling in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/file-upload-handling/ (personal) or .claude/skills/file-upload-handling/ (project).
Which AI agents can use file-upload-handling?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is file-upload-handling safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains file-upload-handling?
It is published by aj-geddes in aj-geddes/useful-ai-prompts. It has 478 recorded installs.
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