Security Considerations

TokenFlow implements multiple security measures to protect your authentication flow.

Built-in Security Features

1. Request Timeouts

All HTTP requests have a 30-second timeout to prevent hanging connections:

• Prevents indefinite waiting on network issues
• Protects against slow loris attacks
• Ensures responsive error handling

2. Response Size Limits

Responses are limited to 1MB to prevent memory exhaustion:

GoPythonTypeScript

const maxResponseSize = 1024 * 1024 // 1MB

MAX_RESPONSE_SIZE = 1024 * 1024  # 1MB

const MAX_RESPONSE_SIZE = 1024 * 1024; // 1MB

3. Token Expiration Buffer

Tokens are refreshed 10% before actual expiration to prevent race conditions:

def is_expired(self) -> bool:
    buffer = self.expires_in * 0.1
    return datetime.now() >= (self.expires_at - timedelta(seconds=buffer))

4. HTTPS Enforcement

All API calls use HTTPS to ensure encrypted communication.

Best Practices

Token Storage

Secure Token Storage

Always store tokens with restricted permissions:

• Unix/Linux/macOS: chmod 600 token.json
• Windows: Set appropriate ACLs
• Never commit tokens to version control

Environment Variables

For Hyper service configuration:

export HYPER_BASE_URL="https://your-hyper-instance.com"

Production Deployment

1. Use encrypted storage for tokens
2. Rotate tokens regularly
3. Monitor for unauthorized access
4. Implement rate limiting
5. Log authentication attempts

Compliance

GitHub Copilot Terms of Service

Using TokenFlow to access GitHub Copilot may violate GitHub's Terms of Service. This project is intended for:

• Educational purposes
• Research and development
• Understanding OAuth2 device flow

Always obtain proper authorization before use.

Reporting Security Issues

If you discover a security vulnerability, please email:

📧 shadow.li981@gmail.com

Do not open a public issue for security vulnerabilities.