This repository contains the Java implementation of an AWS Lambda function used to download and upload keys to Amazon S3, with secure authentication and best practices for managing sensitive configuration.

• 🔐 Secure Authentication
  Authenticates requests using environment variables or IAM role permissions to avoid hardcoding credentials.

• 📥 Download Keys from S3
  Fetches keys or other secured files from a specified S3 bucket and path.

• 📤 Upload Keys to S3
  Uploads new or updated key files into the target S3 bucket, optionally with metadata or encryption settings.

• 🛡️ Environment Variable Support
  Uses environment variables to securely store and access:

  • Bucket names
  • Key paths
  • Authentication tokens or secrets
  • Any other configuration

• Centralized key rotation system
• Secure distribution of credentials across environments
• Integration with CI/CD pipelines for secret deployment

• Java (8+)
• AWS Lambda
• AWS SDK for Java
• Amazon S3
• Environment variable-based configuration

⚠️ It's recommended to use IAM roles for authentication in production environments instead of hardcoding credentials.

You can deploy this function using:

• AWS Lambda Console
• AWS CLI
• AWS SAM
• Terraform / CDK (optional)

Make sure to set the required environment variables in your Lambda configuration.