How to Upload Files to AWS S3 Using Pre-signed POST in Go?

How to Execute a Pre-signed POST Upload to AWS S3 in Go

Question:

How can a pre-signed POST be utilized to upload files to an AWS S3 bucket in Go?

Answer:

To accomplish this, follow these steps:

1. Configure S3 Bucket for Public Download:

   • Set bucket policy to restrict access to public download only.

2. Create a POST Policy for the Upload:

   • Generate a POST policy defining expiration, bucket, key, public-read access, credentials, and date.

3. Generate and Sign the Policy:

   • Fill in policy parameters, base64 encode it, and apply HMAC-SHA256 with hex encoding.

4. Construct and POST Multipart Form Data:

   • Manually create HTTP POST multipart form data, ensuring fields are in the specified order and adhere to the policy.

Additional Information:

• [Example Web App for Google App Engine Rendering a Pre-signed POST Form](https://github.com/ksnir/go-presigned-post-playground)
• [Library for Pre-signed POST in Go](https://github.com/ksnir/go-presigned-post)
• [AWS S3 Pre-signed POST Uploads Documentation](https://docs.aws.amazon.com/AmazonS3/latest/dev/PresignedPost.html)

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