A simple S3 proxy service that generates signed URLs for uploading and downloading files from AWS S3.

You need to set the following environment variables in your Val Town settings:

• AWS_ACCESS_KEY_ID - Your AWS access key ID
• AWS_SECRET_ACCESS_KEY - Your AWS secret access key
• AWS_S3_BUCKET - The S3 bucket name to use
• AWS_REGION - AWS region (optional, defaults to us-east-1)

Your AWS credentials need the following S3 permissions:

• s3:GetObject
• s3:PutObject

Generate a signed URL for uploading a file to S3.

Request:

{
  "objectId": "my-file.jpg"
}

Response:

{
  "signedUrl": "https://bucket.s3.amazonaws.com/my-file.jpg?...",
  "objectId": "my-file.jpg",
  "expiresIn": 3600
}

Generate a signed URL for downloading a file from S3.

Request:

{
  "objectId": "my-file.jpg"
}

Response:

{
  "signedUrl": "https://bucket.s3.amazonaws.com/my-file.jpg?...",
  "objectId": "my-file.jpg", 
  "expiresIn": 3600
}

1. Call /upload with the desired object ID
2. Use the returned signed URL to PUT your file directly to S3
3. The signed URL expires in 60 minutes

1. Call /download with the object ID
2. Use the returned signed URL to GET the file directly from S3
3. The signed URL expires in 60 minutes

The API returns appropriate HTTP status codes:

• 200 - Success
• 400 - Bad request (missing objectId)
• 500 - Server error (missing config, AWS errors)